Route Tracking. Project Proposal
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- Maria Hensley
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1 Route Tracking Project Proposal Abstract Take the lead from similar GPS tracking mobile applications and provide a more detailed record of a typical activity route, whilst incorporating elevation changes into exercise calculations. The app features a limited user interface that provides detailed information about a user s Trek. This task incorporates the GPS sensor in coordination with the Google Maps API to visualize a traversed route. Index Terms Component, API, GPS, Interface, ViewGroup I. INTRODUCTION A. Aim In this paper a proposal is introduced to develop a Route tracking Location based service targeted towards a cyberphysical system. The service will run on an android-based phone as an app. The time-driven app will periodically record the location of the Android User through sensors in the phone as he/she completes a track. This data is then processed to give a variety of information showing the runner s progress over time including: timing, pacing, average speed as well as calories burnt. Furthermore, the data can be processed to create route visualization over a map. B. Motivation While there are several apps that perform similar actions i.e. Nike+, they only take in to account the two dimensional positioning of the user: latitude and longitude. The proposed app has the potential to become more accurate as it takes a third dimension of the user into account, the elevation. The proposed app will be targeted towards a whole range of customers. From Hikers to marathon runners, dog sled teams, skiers & outdoor enthusiasts. II. BACKGROUND The proposed app should be all inclusive in a typical android- OS system. As such, in terms of hardware, the entire system can be executed just in a single suitable cell phone with no additional accessories. The phones available for this project are the Nexus_S and the Galaxy SIII, both of which fulfill the requirements discussed in the subsections below. A. Important Hardware Requirements GPS Sensor: This is the main sensor with which the app will record the location of the user (latitude, longitude, elevation). Responsive input terminal: Required to enter information about the user, and set parameters for the app. Achieved through touchscreen interface of the screen. Graphic Output Interface: Interface through which user can track his/her progress as well as viewing map visualization. B. Important Software Requirements Android-OS: Cell phone has to run the latest Android OS which are compatible with the below APIs and programs. Android API: Contains classes & methods to interact with the Android OS The android s application framework is vast with a whole host of reusable components. In this proposal we only present two components. Further research and work in to the project may reveal more components that might be utilized. Google Maps API: Contains classes & methods to interact with Google maps, which will be used in map visualization. C. User Interface A major concern with the development of a mobile app, is the layout of the user interface. The Android uses an architecture of Views grouped into ViewGroups, that the user can call by touching the screen. Upon launching our app, a ViewGroup MenuScreen will load displaying the options 'Past Maps, Create Map, Settings'. Each of these options represents a View that is owned by the Viewgroup MenuScreen. From the View PastMaps, the user will be able to access altitude representations of their routes, and access GoogleMaps with their route laid over the map. This view will also hold information about calories burned on previous routes, and a graphical comparison of the stored routes. The CreateMap View will allow the user to press a button and begin tracking a route. This will trigger the GPS to start logging information. After pressing the begin button, A stop button will appear that user may press to stop the route. The last View titled Settings will be used to change various settings of the app. We will include different units to choose from (SI vs. US), and the user will be able to input personal information to help calculate calories burned more accurately. D. Sensors The main sensor used by our app is the GPS. Our main concern in using the GPS is the accuracy of the data, and how the usage of the GPS will drain the battery. We have found that cell towers may provide more accurate information more quickly, but have opted not to use tower tracking initially to
2 simplify our design. As the semester progresses and if time allows, we may include tower tracking. We can control the power usage of the GPS by limiting how often the GPS returns data. We can set this with a time limit & also a minimum distance traveled. This variable will also be changeable by the user dependent upon the pace of the user s activity. We will have to fine tune this variable as the app becomes usable, and we can see how it affects the quality of the maps produced. E. Google Maps APIs The key functionality of the application will be driven by the use of several Android and Google API s. Specifically, initial investigation has highlighted the Android Location API, Google Maps Android API, and the Google Maps Elevation API as probable components in our application. Google s MapView() library for Android devices provides developers the main UI functionality of Google Maps such as map control and rendering, but also allows a number of Overlay types to be drawn on top of the map. The drawing of Overlays is an integral part of the application, as it allows for the visualization of activity routes, both present and past. Whether obtaining the device location through the Android Location API or Google Maps API, the application will store an array of latitude and coordinates for use later on. In order to get the elevation of a given point, the Google Maps Elevation API will be used. Using the Elevation API, coordinate pairs of latitude and longitude are provided to the API, and the Google Maps elevation for that point is returned. Once elevation data is collected, an overlay of the route will be drawn on top of a Google Maps, with variation in route color based on elevation changes. III. PROPOSAL CHALLENGES Of the challenges expected, the most outstanding obstacle is having no previous experience with Android application, Java, or XML development. There is a relatively short time frame in which our group must transition from learning about the basic Android architecture to actually implementing a program to obtain the desired functionality. Additionally, satellite communication will pose several issues in itself, from signal strength to power management. Perhaps the most significant concern here is satellite-to-phone accuracy: without reliable accuracy, the purpose and improvements our application is intended to provide will be greatly undermined. V. TRACKTREK OVERVIEW Launch App Choose settings Start Route Log GPS coordinates and elevation at controllable time intervals End Route Save information to Routes activity Select route from list in Routes activity Upon selecting the route, select from the following options: Google map visualization Elevation visualization Calories spent VI. HIGH LEVEL SYSTEM DESIGN A. Launch App Upon launching the app, the user is presented with four options in the MenuScreen activity depicted in Figure 1. The options include: Start Route Start GPS tracking Previous Routes GPS coordinates of routes Settings User preferences Map Temporary demonstration of Google Maps. Future application of Google Maps will be elsewhere. IV. PROPOSAL GOALS Despite the challenges we will encounter, we are confident that completing this project will accomplish several goals. Upon successful completion of the project, our group will have a solid fundamental understanding of Android application development. This will include experience in Java programming and XML design, both of which are skill sets that have an extremely broad array of applications outside of mobile application development. Altogether, a key take-away from this project is practice in creating a simple user experience for a complex task.
3 Figure 1 MenuScreen Activity Layout Each of these selections starts a new activity with different functions. Upon launching the app, It will recall the settings that have been previously determined during other uses of the application that have been set in the Settings activity. If TrackTrek has been paused to use the phone for other purposes, it will also continue running the GPS in the background. Upon launching, the Start Route button may also display End Route, depending upon the current status of the GPS upon launch. The app will not default to the MenuScreen, but will open where the user last left the application. B. Choose Settings The user will be able to define different parameters to change the outcome of the route tracking. These settings will be determined under the Settings activity using the spinner devices created by the Android developers. Spinners act as a dropdown list of strings, which displays the choice made by the user. These choices are stored into a global parameter defined by the programmer stored in a list of preferences called SharedPreferences. SharedPreferences is called to save the choices, and once again to use the choice across all activities within the application. Saving choices is called by the program using Android derived functions such as onselected(), and recalled in the settings menu by using onresume(). Figure 2 Settings Activity Layout The user will first be able to choose if they would like to see mile or kilometer values for distance traveled. These choices are shown in the spinner device described earlier. This will directly affect which unit is used when displaying a distance on the map and on the elevation depiction. The graphical layout of this parameter is demonstrated in Figure 2. Another preference will be the sampling rate of the GPS. This will determine how often the GPS records latitude/longitude information based on a time factor and a distance. This parameter may greatly increase the batteries performance for long routes, and will allow increased accuracy for those seeking greater performance. Sampling rate will be directly related to exactness of calories burned, as well as the graphical representations of the route. This parameter has not been implemented in this demonstration and will be added at a later date. C. Start Route Once the user is ready to start his run, he selects the Start Route option. From the settings (covered in the next subsection) the app will start logging in the User s Latitude/Longitude co-ordinates and elevation at fixed time intervals. D. Log GPS Coordinates & Elevation 1) GPS Coordinates
4 Our Android-powered devices (S3 & Nexus S) can receive location updates through two underlying technologies, using the internal GPS sensor or cell network localization. These technologies are all contained in a whole host of high-level abstract methods to find a cell phones position. This level of abstraction allows the same piece of code to typically work for any android phone which contains a GPS sensor. As such our code works just as on well on the Galaxy S3 or the Nexus S without requiring any modification of code. For our application purposes we a high degree of accuracy is required. Generally a location provider with greater accuracy (GPS) requires a longer fix time than one with lower accuracy (network-based). We want to record the location data as quickly as possible and update it as more accurate data becomes available. To do so we use both GPS and network providers. We receive location updates from multiple location providers that may have different timestamps and varying levels of accuracy. Logic is incorporated to disambiguate the location providers and discard updates that are stale and less accurate. The typical flow of procedures for obtaining the user location: 1. User starts the run. 2. App starts listening for updates from desired location providers. 3. Maintain a "current best estimate" of location by filtering out new, but less accurate fixes. 4. Stop listening for location updates. This flow is demonstrated in the figure below. Figure 3 - A timeline representing the window in which the application listens for location updates. At the moment we have been able to get accurate Latitude/Longitude values. The next step is to save a log of those values, which can then be used as the basis for computations and analysis by the other components of our application. Furthermore since our application will need to continuously receive and process location updates, a more efficient use of resources can be utilized if we implement the logic as a background service, so the user can multitask on the phone. Another we factor we have considered is power consumption. Long windows of listening for location fixes can consume a lot of battery power, but short periods might not allow for sufficient accuracy. So we will have to carry out field tests to find out the best compromise. When the user is done with his/her run, location updates are terminated to reduce unnecessary consumption of power and network bandwidth. Reverse-geocoding is the process of translating latitude longitude coordinates to a human-readable address [ ng.html]. We have implemented this logic in our code to be used as a reference in future field tests. 2) Elevation On Android powered devices there are three different methods of acquiring the elevation at a location: 1. Altitude raw data straight from GPS Sensor: In addition to Latitude & Longitude the GPS sensor can also acquire elevation. However sources[ indicate that these readings are unreliable and inaccurate. 2. Utilizing Web Service, which can return an elevation reading: From the Latitude & Longitude coordinates acquired by the GPS, a Web Service can take those values and return an elevation reading. USGS Elevation Query Web Service or Google Maps are examples. 3. Using the Barometer sensor: Commercially Air pressure readings have been used to more accurately calculate the relative altitude. Out of all three methods, this one seems to be the most accurate (according to research). However only the Galaxy S3 has a barometer sensor, the Nexus S do not have one. For our application purposes, we are not interested in the absolute altitude above sea level per se. Rather we are interested in the changes of elevation the user will go through as he/she goes on his/her run. As such the first two methods could be feasible. Further field tests are required to test this hypothesis. E. End Route Ending the route turns off the GPS and elevation tracking, and stores the information under the routes section. This action will eventually prompt the user asking if they want to view the Google map visualization, the elevation map, or the calorie counter. F. Select Route from List in Routes Activity The Routes activity will show a dynamic list of the routes tracked by the application. This list will grow by +1 every instance the End Route function is called. These routes will be given a file name chosen by the user upon completion of the route, or until we enable this feature a generic name such as Route1, Route2, etc. The routes will be listed in a date created order listing the most recent route at the top of the list. The
5 routes activity will also implement a means of deleting the information if desired. This approach may cause some confusion at first when the user terminates the GPS by selecting End Route. They may expect something to immediately happen upon pressing End Route, but will find that no immediate action happens. To go around this shortcoming, we may be able to open the Routes screen upon pressing the End Route button and select the first route for the user; so that they are immediately prompted with what information they want to view. G. Google Maps Visualization As discussed in the above sections, once the user has completed an activity, the application stops logging positioning data and then stores the waypoints of the recently completed route into the Previous Routes memory area. Based off the methods we intend to apply in order to obtain elevation data, this information will likely be stored into an array in ordered pairs of latitude and longitude. In fact, within the Google Maps library, a predefined class labeled GeoPoint exists which stores a pair of latitude and longitude coordinates as integer numbers of micro degrees. In order for the user to review their route later on, we must incorporate the Google Maps API. In order to do this with an Android device, we first import the Google Maps external library, which contains the key class MapView. This was done within our AndroidManifext.xml file. MapView is a subclass of the Android class ViewGroup. Basically, MapView provides a container for the Google Maps API, allowing the user the manipulate map data and control the view. The map displayed is constructed with data from the Google Maps Service, but now the map can be controlled with keypresses, touch gestures, and other common user interface elements. A key feature of the MapView class that we wish to utilize is the ability to draw Overlay types over the generated map that respond to user inputs. Specifically, we are interested in the ItemizedOverlay class (extension from the class com.google.android.maps.overlay) within the Google Maps library. This base class consists of a list of OverlayItems, which in the case of route drawing, controls the orientation, span bounds, and marker/waypiont creation along a route. An additional extension of the Overlay class is the RouteSegmentOverlay, which will be explored and ideally utilized as we move forward with our application development. Although not yet implemented, our next steps will involve using both of these classes, along with the GeoPoint class, to plot out a user s activity route. At the time of our midterm presentation, our application has the ability to obtain latitude/longitude coordinates via a GPS sensor or Location Services, as outlined in the above sections. Concerning map visualization, we are able to center a map over a pair of latitude and longitude coordinates input by a user. Figure 4: Screenshot of Google Maps Implementation Outside of location services, the key Google Map classes that allow this are MapView, MapActivity, MapController, and GeoPoint. A necessary step to realize this was the generation of a Google Maps API Key (which is unique to each machine used during an app s development stage). This is required to identify one s application, as Google limits the number of times an individual/app accesses their satellite and server data. In order to get a map centered on the location of the device, Location Services must be implemented. Now that the Google Map classes allow control and viewing of a map, interfaces such as LocationListener and LocationManager prompt the device to detect changes in GPS status and receive location updates. Upon further testing, the final components used to achieve our desired functionality will be described in greater detail at a later date. H. Elevation Visualization This option will make a timeline visualization of the elevation information using the sampling rate chosen by the user in the settings menu. The visual will resemble a line graph, and will be shown in Miles/KM versus time. I. Calories Spent VII. MIDTERM PROGRAMMING CHALLENGES The biggest challenge our group has faced is the breadth of concepts & syntax required to understand the Android SDK environment. While there are a lot of resources available for support & learning, (being a worldwide multibillion dollar industry tends to create that) we have found the android platform has a broad learning curve.
6 One of the primary challenges our whole group faced was the lack of experience in developing an android application. Eclipse is a great development tool, but even that was not enough to bridge the gap in understanding of xml and javascript. Fortunately, Google provides excellent resources to help one get up to speed. However, all of us struggled at first to understand how each component is related to or required by another component to create the over all application function. Miscellaneous errors with the Java compiler and syntax errors were eventually solved, but we have encountered nearly exactly what we expected in our initial proposal challenges section. VIII. MIDTERM GOALS With reference to our project RoadMap, we feel that we accomplished what we set out to do before our midterm presentation. Although we don t have a firm method to calculate calories burned yet, we made progress with the map visualizations, which was initially a later milestone. As mentioned throughout our high-level system design section, our next steps require storing the latitude/longitude pairs of a user s route, and then plotting them on a Google Map. Overall, our group is confident that we can achieve our original app functionality within the stipulated project timeline. Figure 5 Project roadmap
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