MAPPING IN GOOGLE EARTH

Transcription

1 MAPPING IN GOOGLE EARTH Guided Lab: Mapping, Part I - Sample and Existing Data I. Geolocating the Pavilion in Google Earth (via SketchUp). For this exercise you will have both the Sketchup and Google Earth applications open at the same time - they work together. 1. Open your Pavilion model in Sketchup. 2. Add in the Add Location button to your toolbar, if it isn t already there by selecting View>Customize Toolbars and adding it. Then click Add Location. 3. Type Duke East Campus into the Add Location search box. Use your navigation tools to get to the main part of East Campus. 1

2 4. Use your zoom and pan tools to navigate to the Pavilion it is in the southeast corner of campus near the corners of Main Street and Buchanan. Drag the edges to center your location on the Pavilion itself. You can recognize it by its blue octagonal roof. Click Grab. 5. The location you selected should appear underneath your model. Select All and then position your model so it overlays the shadow of the Pavilion 2

3 on the map. The size should be to scale since you created your model to scale in Sketchup. 6. Now click File>Export>3D Model. Select Google Earth KMZ. Save your file as Pavilion.kmz. (Note: you can also use the Place File option if you want to preview the file in Google Earth right away, but you ll need to remember to save your KMZ file later.) 3

4 7. Open up the Google Earth Pro application (note: you won't need Pro now, or for most of what we do, but will need it later, so we ll go ahead and make sure this is set up). Enter the registration code if needed: Login: License Key: JCPMNH5RCF4HNY6 Note: Google has an educational license option for Google Earth Pro (otherwise $400). Pro allows you to import GIS and other files, create movies, and print at a higher resolution, among other things. The regular license works well for getting started and may be all you need. 8. Select File>Open and choose your Pavilion.kmz file. 9. Let s review what happened here. We took our 3D model object and embedded it into a text file format based on the Keyhole Markup Language, or KML. These elements were together bunded in a Keyhole Markup ZIP file, or KMZ file. People tend to use KML and KMZ interchangeably, but technically KML is only the text part of a single Keyhole Markup file. This becomes important because many applications can read a KML file, but often only the text part, but few can render a KMZ with all its media elements. KML is kind of like HTML, the markup language of the web, in that it includes a series of tags and values that render, or display, in a browser that is prepared to show them properly. Later we ll look at the raw text that gets created by this Google Earth, but for now we are taking advantage of how we can use it as a WYSIWYG tool, somewhat similar to the way Dreamweaver or iweb can be used to assemble web pages. Another way to think about Google Earth is as being analogous to a web browser in that it shows you a text file with associated media content embedded within it. As you ll see later, you can also view web content (to some extent) from within Google Earth and you can view Google Earth content in the web! This can get confusing, but there are specific reasons you d want to create your content with one or the other presentation strategy in mind. 10. Look around at the interface and get to know the windows and controls for the Google Earth application. You have a search area, a booksmarked Places area, where you will also author new content, and Layers area, where you can turn content provided by Google and endorsed third party purveyors. You ll also see an authoring toolbar, which you will use to create various kinds of annotations to help contextualize your content. 4

5 11. Practice zooming in and navigating around the East Campus area. You can Tilt and Pan the view as well as zoom in and out. The Google Navigation Tools can be accessed from your screen, keyboard, and mouse. It is probably easiest to get used to using them on screen first and then seeing what you can do with the mouse. Key features include the Look joystick, which is the wheel on top, which allows you to spin your perspective from a central vantage point. Handy Keyboard Tips: shift + down arrow Tilt Up: adjusts your viewing angle closer to the horizon. shift + up arrow Tilt Down: adjusts viewing angle to be from higher up. [See 358&topic=22362&answer= for more.] 5

6 Try moving around with your mouse as well. Note that the scroll-wheel is useful here: roll it to zoom in, or hold it down and drag around for a free transform kind of view of your workspace. You can decide for yourself which way is most comfortable for you to work. 12. Under Layers turn on Roads and Terrain. Later you can turn on 3D buildings, but leave that off for now since this will try to load any 3D buildings that have been shared for the region. (We ll do this later; having them on now may slow down your application.) 13. Positioning of your elements in Google Earth is based on Latitude and Longitude coordinates. These are in turn based on a simple cylindrical (Platte Carree) projection with a WGS84 datum, which coordinates Lat/Long with a spherical model. This is important to understand because it affects how the map gets distorted on the globe. The meridians and parallels are equal, straight lines &topic=23750&answer= The satellite imagery comes from planes, satellites, balloons, kites, and other resources, with about 40% overlap one way and 60% the other. The images are then scanned, color corrected, warped etc. and assembled 6

7 into a mosaic. (paraphrased from Mark Aubin, Google Under File>Preferences, change your measurement preferences to Decimal Degrees for your Latitude (N-S) and Longitude (E-W) coordinates. Spreadsheet-based mappers often use this format. 15. Under Places, click My Places then Add>Folder. Call your new folder Historic Trinity College. Drag your Pavilion folder, which is under Temporary Places, inside your Historic Trinity College folder. The goal is to put all the content associated with the Historic Trinity College project inside. 16. Next, right-lick on Model within the new Historic Trinity College folder (inside the Pavilion subfolder) to make fine adjustments to the model's position. Select Get Info. This is where you will line up your Sketchup model further with the base image. Rotate, Move, and Resize (if necessary) the model. Shiftdrag to constrain while scaling. Be sure to orient the door correctly! 7

8 10. When you are satisfied with your model s position, right-click the Historic Trinity College folder again and Save Place As. Call it Historic Trinity College.kmz and save it to your project folder on the desktop. 11. Note that you can turn your building off and on by clicking the checkbox beside it, and have it appear and disappear in the 3D Viewer. Doubleclicking on it centers your building and brings up the bubble window with basic annotation info about your file. 12. Go ahead and right click the model in the Place window again to bring up Get Info. Type a little text into the information window and click OK. Click on your Model link again and see your bubble come up. 8

9 II. Points, Image Overlays and Georectification While we knew where the Pavilion model should be located, we need to position the other elements based on less direct evidence. We we will place the Washington Duke Building, the Gates, and the Fountain based on our best guesses from other source materials. First we will create a few reference points in anticipation of overlaying the historic map on the campus model. Create two thumbtack points: one for the location of the Washington Duke Building, and the other at Epworth. To do this: 1. In the Search location box, type in the following GPS coordinates: , (Washington Duke Building) 9

10 2. Drag the resulting Placemark into the My Places area. Right click on it to edit the placemark and rename it Washington Duke Building. 3. Note that you can choose from a number of default placemarks by clicking on the icon next to the Name and selecting one. You can also create your own icon from an image, which we ll do later. Experiment with that now if you wish and say OK. 10

11 4. Do the same thing for Epworth. Coordinates are: , Our next stop will be an historic map of Trinity College from the Digital Durham website. We could just link to the existing resource, but we ll want to resize it and upload for a web folder. BE SURE TO CITE YOUR SOURCE! keep track of where you got the image for future annotation. Open a web browser and download the source map from Digital Durham: 11

12 Click on the image to get the full size view, then download it by rightclicking and saving to your desktop. 6. Open the map file in Adobe Photoshop to resize it. 2930x2092 is the way the image resolves when displayed at 72 DPI. This would give a better resolution image, but would probably slow the application down when loading from a web browser. Reduce the file size by selecting Image>Size and decreasing the width and height. Start out 12

13 by reducing the width to 1500 and allow the height to change proportionally. Save File As a jpg with the name Budd_Map_1902_med.jpg. (PNG is also OK) (Note: you don t have to use this name, but make sure your name has no spaces, and includes the file extension.) 7. Upload the image file to your web folder using a secure FTP application (file transfer). You could use your personal web space, or a project space. These directions are for creating a subfolder in your personal Duke space. NOTE: We are using Cyberduck (free to download) for these steps, but you could also just use if you are on the Duke servers. Other applications like Filezilla are also good. The main advantage to using a specialized application is it is faster and easier to move around a whole bunch of files at once. 13

14 In Cyberduck, click Open Connection. (webfiles will as you to log in with your netid and password.) Fill in the following connection info - SFTP: Username: Password: login1.oit.duke.edu netid PWD 14

15 8. Doubleclick the public_html folder. Anything you put inside that folder is published to the web. (Note: some project areas on Duke servers don t have a public_html folder but are set up to be immediately webaccessible by the way the server is configured.) 9. Create a new folder for your image. To do this, lick Action>New Folder and create a folder called wired

16 10. Upload your Budd_Map_1902_med.jpg by dragging it into your new folder from your desktop folder. 11. Note: you might also want to make a New Bookmark for your web folder so you don t have to type in all the address info later. Do this from the Action menu where you created a new folder. 12. You are done with Cyberduck for now, but you may want to leave it open in case you decide to add more images later. Next, open up a web browser (Firefox, Safari, Chrome ) and navigate to: for example 16

17 You will see a list of files (in your case, probably only one- the one you just uploaded). Click on that file to double-check that your image is working from the web browser. When your image shows up, you know the image is web accessible. Copy the URL of the map from the browser address bar (NOT by clicking on he image from webfiles if you are uploading your image that way) into your clipboard. You ll be pasting this URL of your selected image into Google Earth to use as your image overlay. Again, your URL should look something like this: The reason we are linking to a web version of the file rather than just embedding the image in your KMZ file is it will load much faster from a web browser than from a KMZ, but you do also have the option of storing the image locally as part of the KMZ itself if you don t want it to be on the web. You can try this later and compare the effects. 17

18 NOTE: If for some reason (NetID issues etc.) you can t upload your own edited image, use the URL above fo the next step 13. Back in Google Earth, make sure your viewing window is centered on East Campus. This will make it easier to orient your image once it has been imported into your layer. 14. Select Add> Image Overlay. An annotation window will open up. Next to the Browse button paste the URL of your map (currently in the clipboard) and press return. This is how you tell the program where to find the image you are going to overlay on top of your Google Earth site. Name the Image Overlay Trinity Map Copy the Digital Durham URL to the original too. You ll add to this citation later, but it is good practice to keep track of where you get your images as you get them, especially if you are making a derivative object as you have here. 15. You should notice that the map jumps in to fill up most of your Google Earth 3D viewing screen when you place it. After adding this Image Overlay KEEP THIS INFO WINDOW OPEN - you can only move your map around while it is open. If you close the Info Window by accident while you are editing, you aren t doomed! Re-open it by right-clicking on the Untitled Image Overlay in the Places window on the left. 18

19 16. Your next step is to adjust your map so it is aligned correctly on the underlying Google Earth imagery. To facilitate this process, you will want to reduce the transparency of the map overlay to make it easier to line up your image. Use the Transparency Slider in the Info Window. About 40% will probably work well to start you want to be able to see the features below the map as well as the map itself. You may want to toggle this up and down at various times as you adjust your map. 17. Now you will begin to pull and stretch your map to align with the streets and features visible underneath. This process is called Georectification. In the case of the 1902 map, we are looking at a layout of a campus that no longer exists. Buildings and streets are different. The entrance to the campus is also in a different location. This makes georectification a special challenge, but also makes the overlay process potentially more valuable in how it provides a window on the past. (Potential annotation material!) You have three points to work with as you attempt to align the map with the underlying contemporary map and imagery. The first two you just created: the Washington Duke Building and Epworth Hall. The third is the location of the Pavilion, which is unchanged from the Historic Trinity College campus we are modeling. How might you find more pin points? Did you see anything in the archives that might help? 18. Push, pull, and drag your map as best you can to overlay the building properly on the site. Use the same green placement tools we used to position the Pavilion. Again, use Epworth, the Washington Duke Building, and the Pavilion as a reference. This will not line up exactly, especially without distortion, but give it your best shot! Note: We won t cover this in our workshop today, but georectification is something that you can do with more control in ArcGIS and other specialized applications for this purpose. In ArcGIS you can create control points that associate a part of your map with a geolocation and then automagically have the program attempt to line up your map. Using that process you can then export a file for use with Google Earth Pro. Visit the Data Library for help with this process. But to continue: 19

20 Again, you will find the Google Earth navigation tools useful as you work your way around with the map. Rotate around the green triangle, move the whole map from the center cross-hairs, scale from the corners and stretch from the edges. Use the shift key to scale from a fixed centerpiont. One you are relatively satisfied with how your map is positioned, press OK. As you do this, note that if is very difficult (well-nigh impossible in this case) to get things to line up perfectly. This is a normal experience, and having it all work out magically would in fact be a false specificity. Issues come up for several reasons. Perhaps, as in this case, the map itself is not to scale. Even when it is, Google Earth isn t perfectly tiled, and changes in human geography and built landscape features can also factor into distortion. Relief Displacement also affects the presentation of space itself in aerial imagery: 20

21 nt.jpg 19. You may or may not decide to keep the original map visible as a resource in a project like this. Because of it is of historic interest we could try to warp it to overlay better using Photoshop by overlaying it on a snapshot layer in Photoshop. If you want to try that, use Grab to get a copy of the appropriate location from Google Earth, then open the file in Photoshop. In this procedure you would create a new Layer for the map, and resize it using the Transform tools with the transparency reduced so you could see the underlying screen grab from Google Earth below it. Remember that as you do this that all the other images are warped too this is a subject of critical cartographic interest when it comes time to make any arguments from your representations here! 20. Once you are finished with the map, click OK. 21. Follow the same steps, beginning with Sketchup>Add Location, to import 21

22 the other objects you created: the Washington Duke Building, the Fountain, and the Gates. Note that you can enter Latitude and Longitude coordinates in the search box. 22. For the first two, you have been given the coordinates, so you can just plug them in. Can you infer where the Gates would be from your Map overlay, along with historical imagery? One source to check: Create a placemark for the Gates, and copy the coordinates into Sketchup so you can position your model and save it in a KMZ. 23. If you have time, try overlaying some other historic maps of the Duke Campus. Browse around in the Digital Durham website to find others to include. Repeat the process for reducing their size and adding them to our website for quick loading. III. Creating Annotations: Points, Lines, Polygons to display Text and Media 1. You have already created some annotation points by placing markers for the Washington Duke Building, Epworth, and the Gates. Now we will edit those annotations so the Get Info box provides more information to users who visit your map. You may want to include text, hypertext links, images, audio and video files, or other materials. 2. First, we will edit and format the text in a Get Info box. Create a new bubble at the Pavilion by clicking on the Create Placemark button. 22

23 3. After you have positioned the Placemark, you can edit the text and other information about the placement in the Get Info window. You can type plan text, or use some simple HTML code. We will add some text, create a web URL link, and insert an image from an external application. 4. Type in some informational text about the Pavilion. You might cite the following from this site (note that this link might be useful for other annotations too): Stagg Pavilion: Summer house or gazebo in front of East Duke, near the statue of the Sower, given in 1902 by Mary W. Lyon Stagg, the daughter of Mary Duke Lyon and granddaughter of Washington Duke, in honor of her husband James Edward Stagg. He was a college trustee. 5. Now create a link to the source URL for this information using HTML: <a href= > East Campus Building Info from Duke website </a> This code indicates that you are creating a hyperlink. The user will click on East Campus Building Info from Duke website and the original source website will pop up in Google Earth. 6. Say OK and test it out. Notice how Google Earth allows you to open the links within the application, and then return back to your map. One of the Google Earth preferences allows you to launch an external browser if you prefer. 7. For more control over how the text appears, use a subset of HTML code. For help, open up the RichTextGuide.kmz file (located in Resources) and save it into My Places so you can use it for reference. If you are familiar with basic HTML, go ahead and try out tags like <strong></strong>, <font size =4></font>, <font color=red></font> etc. There are two ways to grab the code for your own use: first is to right-click on the bubble, and paste into a text editor, or right click on the Place and get to the Get Info window and see the code within the Info Editor. 23

24 A third way would be to use the code as a model and type your own in directly. This process can be useful for getting to know how the code works through greater familiarity. 24

25 8. 9. Now we want to embed an image from an external site. The Duke Archives have lots of images in Flickr. Let s use one: 25

26 We ll embed this image in the bubble. Note that Flickr provides some code for us to do this: This code includes an attribution. The part that just displays the image is: 26

27 img src=" width="397" height="500" alt="stagg Pavilion, undated"> 27

28 10. Go ahead and create and edit more Placemarks, embedding images from the various Flickr collections from the Duke Archives, or from other locations. Some images to get you started are in the Postcard collection (some of which you saw when we visited the archives.) Be sure to include your attributions: <a href= >Duke University</a> 11. Next create a polygon to show where the racetrack used to be. This will function like a Placemark in the My Places window (you can add content in the Get Info window) but will apply to an area rather than just a point. Zoom into the likely area within the Google Earth Viewer and select 28

29 Add>Polygon.. Begin clicking points in sequence in order to create a polygon shape point by point. When you get to the end of your shape, double-click to close it (your pointer will turn green to indicate your shape is closed every step of the way. Option-drag to move a point; Control-click to delete a point. Do not yet close your Info Window you aren t done yet! 12. Edit your polygon by changing its Name, Line Color, Fill Color, Opacity, and Height using the info window (note that height of your polygon blob gives another dimension through which you could convey information). Note: you may need to set the Altitude of your polygon to be above the ground to ovoid it getting eaten up by the Terrain if you have that feature turned on! A few meter above the ground should take care of it but test it out. To do this, keep your Get Info window open (if you have closed it already, you can re-open it by rightclicking the polygon s name in the Places window). 29

30 Press OK when you are happy with your choices. Practice showing and hiding your polygon areas by unclicking them in the Places menu area, thinking about how you could use these menu features in your own projects. 14. At this point, you may also wish to drag your polygon file names around and begin organizing your placemarks within your primary HIstoric Trinity College folder. Custom Placemark 15. You can also edit the icon for your Placemark. There are a number of options built in to Google Earth. 16. While in the Info Window, click on the Pushpin icon on the top-right of the screen and pick from the available options. 17. Experiment with these and think about the iconographic choices you might be making with other materials. One way to tie together your content thematically and conceptually is to use recurring graphical elements or styles. 30

31 We are going to Add a Custom Icon to the library of options available. Click the button, and select the file called trinity_gate_t_icon.png. This can be found in This file was created in Photoshop from a picture of the original gate T we saw in Special Collections. You could also create your own! Your icon will appear in the list of options available to you just make sure you save your file as a KMZ so it remains with it! 18. To add a Video from YouTube to your Get Info Window, use the Embed code that YouTube provides and paste it into the window. For example, this is the Duke Campus tour video created by students in the ISIS Program capstone. 31

32 This code for embedding content uses what is called an iframe to create a kind of portal window into a web application view. Iframes are used in lots of content management systems for embedding web resources, so getting familiar with the syntax here will help you elsewhere as well. <iframe width="425" height="349" src=" frameborder="0" allowfullscreen></iframe> 19. Embedding a web page in your Info Window, rather than just linking to it, is done the same way. <iframe width="425" height="349" src=" frameborder="0"></iframe> Be careful with this though web pages doesn t always fit easily into a little box becase this code is just a portal into the webpage it doesn t resize. You could get something rather bizarre as a result. Try it on a sample Placemark! 32

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34 If you really want a fullscreen webpage, you are probably better off linking to it and having it open up in the browser in place of your map. You can also use an image as a thumbnail and then wrap it with html code so it becomes clickable this can provide the best of both worlds. 19. Arrange all your layers under your folder and choose File Save As. Save the file as a KMZ. 20. Turn on the 3D buildings selector in the Layers window. Some 3D buildings of Duke s East Campus should appear. Navigate around the Trinity main quad to view them in context. Yours could be next! 34

35 21. If you have time, add in some more models from Duke Campus. Look at the KMZZone zip file, located in which contains many of the Duke campus buildings that haven t yet been added to the public 3D Warehouse. Select File Open and add some of these to your project by dragging them from the Temporary Places location to within your folder. Practice turning them off and on by clicking the checkboxes next to them in the My Places area. Note that right now you are adding them to the local storage area as with images, this isn t ideal because they load more slowly from a Google Earth file folder than they do from the 3D Warehouse server, but sometimes that is the only way to distribute content. For now, play around with them so you have more content to work with as you get into the next steps. 22. Some of these models are already in the aforementioned Google 3D Warehouse, which is a central location for storing your Sketchup creations and having them become automatically available to others to view in Google Earth and in some cases to download. 23. You can also go to the 3D Warehouse to find objects to use in your own projects. For example, you can download trees and position them around buildings on campus. abb68e0061b7e74396b0 24. If you are interested in placing trees in appropriate current locations, 35

36 import the DecTrees and ConTrees KMZ files from Day0304Resources. These give you the placemarks for the campus trees. They are originally from ArcGIS shapefiles, which were imported to Google Earth. When we talk about GIS later we ll delve deeper into this topic, but for now know that it is possible to import all sorts of geographical information into Google Earth from other data format. You can remix and mash up all kinds of resources in your Google Earth Browser! 25. To share your full KMZ, however, we need other approaches that involve posting your KMZ files on the web so others can access them. The next section will detail how you can present your materials in a variety of ways: through tours, simple embedded KMZs on web pages, web-embedded tours, and movies that incorporate your tours along with other types of video content. We ll also dive into KML/KMZ code briefly so you can see what is under the hold. The Duke Virtual Tour is one example of such of a composite project, and we ll talk about it along the way to illustrate the process since it passed through all the stages mentioned here. 36

37 IV. Presentation Strategies: Tours and Movies 1. One way to enrich the user experience is to Record a Tour. You can make either a video-only tour, or also record an audio soundtrack. You can choose to pre-program a tour with fixed intervals between data points, or do an entirely freestyle tour. You can also combine both effects to create a tour-within-a-tour and make a movie to export from your tour. 2. Plug the USB headphones into the front USB jack on your computer. Make sure the slider for the microphone is turned on. Test the audio by clicking on System Preferences>Audio and making sure the Input and Outpot sources are the Plantronics USB headset. 3. In Google Earth, position your screen so you are at a good point to start your tour. Think about the points you want to visit as you navigate through the space. Go to individual Placemarks and adjust the optimum viewing angle for each. To do this, position the Google Earth view how you like it, then click the Snapshot View menu item by right-clicking on the specific Placemark in the Places menu. 4. Note that as you do this you are setting a variety of parmeters in the Get Info area for your Placemark: 37

38 5. These are parameters you could adjust manually, either through this info window or, as you ll see later, in the KML code itself. Note also the Date/Time option you can use this to timestamp your buildings, as we saw in the London history example (try it yourself with the Washington Duke Building if you have time later!) 6. Once you are satisfied with the orientation of your individual stops on the Tour, go ahead and preview it to see how it looks. To do this, click on the little folder plus arrow underneath the Places Menu: 7. Check out the Tour Preferences (Google Earth Pro>Preferences) to see if 38

39 you want to make any adjustments. 8. Now you are ready to record. Press the Tour Button. 9. A Record/Microphone indicator will appear. Click the Red record button if you want to record only video. This is just a test run to get familiar with navigation capture. We ll play with the audio part later. Play your tour through. It should automatically move through your placements in the order in which you have put them in your Historic Trinity College folder. If you wish, instead of playing a tour from a set of placements you can freestyle your way through the Google Earth landscape and record that movement instead. When you are done, press the red Record button again to end the recording process. 10. Play back your creation using the playback controls that appear at the bottom of the screen. If you are happy with your tour, click on the Save icon. Save it as a KMZ. 39

40 11. Now you are ready to add audio. This time, click the Tour button and then the Microphone record button. Now start the Tour and begin your narration. Your voice will be synched to the movement of the tour. Press the red Record button again to end the recording session. Playback as before. 12. When you are happy with your creation, Save it and give it a relevant name. You may also want to Save Place as a KMZ file this will enable us to edit the audio track separately later to add in bumper music etc if we wish. 13. FInally, let s make it into a movie. To do this, you will simply need to play back your tour while in Movie Maker mode. You can choose a variety of settings for your movie, depending on whether you want it to be a final product, or if you want to incorporate it into a more complex multimedia production. Click on your tour (the one with audio) and then Select Tools>MovieMaker. Choose your resolution etc. For now we will keep the default settings. Click Record Tour. 40

41 14. You have two options here a freeform video, which is slightly lower quality but enables you to freestyle the video, or a movie export from a tour. Browse to a file save location (here I used the name testmovie.mov) and then click Record. If you have a tour highlighted in the Places window, you may choose the High Quality Tour Mode. You will get a Record Tour option and a progress window. Note that for the Real-time control type of movie you have to click Stop Recording for the pre-packed tour it will stop when the tour is over. 15. One thing you will notice when you play back the video there is no sound! This is a known feature. 41

42 16. If you want to keep your audio narration attached to your video you are going to need to do some third party interventions. For that you ll need to extract your audio file from the KMZ in which it is housed, edit it (if desired), and then paste it into your video. We ll explore the audio file option in the next section, which introduces you to raw KML/KMZ file information. Fortunately, you can use a tool like imovie to accomplish this relatively easily. Audio edits, such as adding in bumper music or amplifying sound, can be done within Amadeus Pro or a similar application, and then you can splice the pieces together in your favorite video editor. Another option would be to use a third party screen capture software that can capture sound as well as video: Quicktime Pro plus the Soundflower plugin is one option; Snapz Pro X, or Camtasia are others. You may want to play around and see which gives you better video quality and compression options for your purposes. V. Editing the Raw KML text file and KMZ archive Throughout this tutorial we, have been using and talking about KML and KMZ files. KML stands for Keyhole Markup Language. KML is the subset of XML (Extensible Markup Language) that relates to spatial information like geographic information and visualization. It is not unlike HTML (Hypertext Markup Language) in that it uses tags and is relatively readable. 42

43 KMZ s are zipped up versions of KMLs plus other supporting materials. They might include geolocations, annotation information, image overlays, tour files, and building models, among other things. We are using Google Earth as a tool for, among other things, writing KMZ files files that are best viewable in Google Earth, but which are theoretically compatible with future applications in other programs. Tip: To see the KML "code" for a feature in Google Earth, you can simply rightclick the feature in the 3D Viewer of Google Earth and select Copy. Then Paste the contents of the clipboard into any text editor. The visual feature displayed in Google Earth is converted into its KML text equivalent. Be sure to experiment with this feature. (from the KML Interactive Sampler Google) 1. We are going to open up our KMZ file so we can get access to the audio file in the tour. To do this, right-click on your Campus Tour Plus Audio and Save as to your desktop. Be sure to save as a KMZ. We will unzip the KMZ using a program called The Unarchiver. This will enable us to get inside the guts of our KMZ. Note: You can sometimes rename your KMZ as a ZIP and open it with an ordinary 43

44 unpacking program. However, this sometimes leads to an endless regression problem- the file never actually opens! 2. Right-click your Campus Tour Plus Audio.kmz file. Select Open With and choose The Unarchiver. 3. You should see a folder with the same name as your KMZ. This is the unarchived or unzipped version of your file (the original remains intact). This folder contains something called doc.kml plus a folder called files. These are the default names for these files, which were generated by Google Earth. Inside the files folder is your audio file. You can open that file and edit it in another application, then return it to the files folder, rezip the folder, and rename it KMZ. You should then be able to open up the tour with the 44

45 edited audio intact. Alternatively, you could edit the audio and then paste it onto the video using another application. Note that if you change the file name or format of the audio file, you ll need to update the reference in the doc.kml file too! 4. To view the code for the KML, right-click on the doc.kml file. Open it in TextWrangler, or another text editing application to see the code. This won t hurt it the KML file is just a text file. Note where the audio file is referenced in this example it is in line 39. This is a link to the audio file contained in the files folder. Note also that you could change the information in your tour manually if you wished the longitude (y), latitude (x), altitude (z), heading (NSEW), tilt (angle), and range are all accessible for editing. 45

46 VI. Presentation Strategies: Embedding KMZ files on the web Finally, we will position your KMZ file on a web server so it can be accessed from a web page. It is also often desirable to make a KMZ file downloadable so users can unlock its full features, but web embedding provides easy access. For an example of web embedded KMZ files used for class projects, see 46

47 1. In Google Earth, Select your Historic Trinity Campus folder and Save Place As a KMZ. Make sure there are no spaces in the file name you choice this time around you need to have the files served on the web, where there are stricter rules for file naming than on your desktop. Historic_Trinity_Campus.kmz would be fine since it includes underscores between the words, for example. 2. Upload the KMZ to your web folder using Cyberduck. (For a Cyberduck refresher, see the map upload section of this tutorial.) 3. Get the web URL for your KMZ by browsing to your folder. It should be something like: As before, use this URL if you have trouble with your own site and you want to keep up with the workshop. 4. Visit the Google Embed Gadget site. This site does the coding for you to embed your map on a web page as with Flickr, YouTube etc. it makes it easier for you to put snippets of more advanced codeinto existing sites 47

48 (then click the tool from within the instruction page) 5. Fill in your URL and adjust the parameters to display the site as you wish. The preview image will update to reflect your changes for color, size etc

49 7. Once you are happy with how it looks, copy and paste the Google Embed code onto your website for public viewing. One easy way to put your map on the web is to create an HTML text file in TextWanger and then paste in the Google Embed code. Save the file as trinity.html. Note that you only have to type in the first and last parts of what is below the middle part between the script tags is what you copy and paste from the Google Gadget. <html> <head> <title>netid s Test Page </title> </head> <body> <script src=" is/kml/embed/embedkmlgadget.xml&up_kml_url=http%3a%2f%2fwww.d uke.edu%2fweb%2fwired%2fworkshop2011%2fves4%2fhistoric_trinity_co llege.kmz&up_view_mode=earth&up_earth_2d_fallback=0&u p_earth_fly_from_space=1&up_earth_show_nav_controls=1&up_ earth_show_buildings=1&up_earth_show_terrain=1&up_earth_s how_roads=1&up_earth_show_borders=1&up_earth_sphere=earth &up_maps_zoom_out=0&up_maps_default_type=map&synd=ope n&w=500&h=400&title=embedded+kml+viewer&border=%2 3ffffff%7C3px%2C1px+solid+% &output=js"></script> </body> </html> 8. Once you have created the file, upload it to your web folder. You should be able to view it at your version of the following URL: where you replace ves4 with your netid! Of course, you will want to edit your website further, perhaps add this to a blog site or other location instead. You may also want to snapshot the orientation of your initial zoom and otherwise tweak the site using the Gadget settings for color, size, etc. 49

50 CONGRATULATIONS! This is not the only way to share your work. You can also use the Google Embed site to embed a tour. If you have time, try that out. Note that some features may be limited. With some custom javascript you can set up a site so you can toggle various layers of content off and on. (Example: There are also many other options for creating and combining maps and other content, such as the movies we discussed briefly, timelines, flash animations etc., but the Google tools are relatively accessible and a decent place to start. ves rev. 10/04/ a 50