TopSURV: Stake Line and Offset

Transcription

1 Oscar R. Cantu

2 Have a Question? At anytime during today s webinar, if you have any questions, please type them within the Questions section of your webinar software. All questions and answers will be posted as a PDF along with all webinar supporting files on the Topcon University website.

3 Topcon University Website For access to previously offered webinars and supporting documentation, please go to:

4 Webinar Agenda Stake Line and Offset, defined Height Computation options Starting Station (when applicable) Offset options (right / left, up / down) Context Menu Options (Design Offsets, etc) Store Point

5 Project Scenario Your field project requires you to stakeout the location of linear objects, such as Utility Lines, Property Lines, Limits of Construction, etc. Or you simply want to be navigated "on line" every so often...think Right of Way lines, perhaps.

6 Stake Line and Offset, defined The Stakeout >> Offsets >> Line and Offset screen allows users to be navigated to a defined line with offsets in Horizontal and Vertical directions.

7 Stake Line and Offset, defined These reference lines are defined as a Start Point and either an End Point or a Direction (Azimuth or a Bearing) from the Start Point. If you are using Start Point to End Point, direction matters greatly. If the line is defined as from 1 to 2 OR from 2 to 1, will dictate what we mean later when we want to go either left or right of the line.

8 Height Computation options Height of the Start Point stakeout points will have the same height (elevation) as the starting point of the line. Sometimes referred to as straight grade. Interpolate Height - the height of the stakeout point will be computed through linear interpolation using the height (elevation) of the starting and ending points of the line...kinda like a staircase.

9 Number of Subdivisions This option designates the Number of Subdivisions, if it is desired, to separate the line into equal parts / lengths. For instance a value of 3, indicates that the user wants to stakeout four points by subdividing the line in three equal segments

10 Number of Subdivisions The Starting Station (SS) or Chainage section will assign highway or alignment stationing at the start point and then carry out to the end of the line. Next!

11 Stakeout Options and Methods Suppose that you do not want to start at the Starting Station (SS) that you just declared for your start point?..suppose that you want to start down station a bit? Enter the Station that you want to being stake with...keep going.

12 Stakeout Options and Methods Station Advance / Back buttons The right and left arrow buttons allow the user to advance or decrease their calculated position along the defined line. These buttons are "tied" to the distance within the Station Interval field.

13 Stakeout Options and Methods Offset Left Offset Right Offsets. These are toggle buttons to change direction either horizontally (left / right) or vertically (up / down / grade) for the calculated offset from your defined line. In other words, if you do not want to be navigated directly over your defined line, tap the direction that you want to offset (horizontally and / or vertically) and enter your offset distance. When done, tap the Stakeout button to being navigation to the first calculated offset point along your defined line...easy.

14 Stakeout Options and Methods This is clickable Now we see the familiar point navigation screen. Did you forget where you are?..just tap the station display to remind yourself which design point number (shown as Point 102 for this example) you have just calculated, as well as your calculated station, offset distance and offset direction.

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16 Context Menu Options There are no less that a million possibilities of what we could now do. However, it all begins with our reference line (start and end points). Then from that reference line, we can offset in any direction (up / down or right / left)...as well as calculate points along (station interval) the line every so often. Let s take a look at our example points of 1 and 2.

17 Context Menu Options Point 2 Elevation US Feet Design Point 102 Design Elevation US Feet Point 1 Elevation US Feet For our example, the two points that we are working with have elevations of 500 and 750 feet. Meaning, the line starts at an elevation of 500 feet and staircases up to 750 feet. To describe some important options that are available within this function, we ll calculate a point midway along this rising line.

18 Context Menu Options Advance Station To do that, we ll purposefully declare our Number of Subdivisions to be 2. This will result in TopSURV navigating us to our start point first. Then, once we advance up station, we ll have a Design Point with a calculated Elevation of 625 feet. Let s check our work

19 Context Menu Options Context Menu Next, we are instantly offered navigation instructions to the station This is the midpoint of our 1000 foot long line from point 1 to 2. To check the resulting elevation at this calculated point, tap the Context Menu (Topcon logo at upper left corner) and select Design Offsets.

20 Design Offsets Point 2 Elevation US Feet Design Point 102 Design Elevation US Feet Point 1 Elevation US Feet Here we are shown the resulting elevation for our Design Point...TopSURV shows feet at the midpoint of the line, with starting elevation of 500 and ending in 750. Check! Ending Elevation Starting Elevation = Change in Elevation = 250 feet Change in Elevation / 2 = Elevation Change at Midpoint 250 / 2 = 125 feet Starting Elevation + Elevation Change at Midpoint = Midpoint Elevation = 625 feet

21 Design Offsets Embedded Calculator You can quickly modify your resulting Design Elevation to whatever you like on the fly. It is also common to use the embedded calculator if needed. You can quickly add / subtract from your Design Elevation and tap the Copy button. Tapping the Copy button will send arithmetic results from the calculator directly into your TopSURV edit field...easy.

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23 Store Point Once you have navigated to your design point, you have the option of Storing your position...time to, put the bubble in the circle and take a shot over what you have physically set in the ground at this location. For GNSS receivers (example shown above is with a GRS-1), it is common to take a 3 epoch, Fixed solution field observation. For conventional / robotic total stations, it is a simple side shot.

24 Store Point String Identifier After the shot, you can assign a Descriptor Code. For this example, we will use the existing Code of G (Gas Line). Since the code of G (Gas Line) is defined as a Line Type of a code within our job s Code Library, we are prompted with a String Identifier field. We ll go ahead and declare a String of 1 for this first gas line that we are working with. All points that share the same Code and String Identifier will instantly be, strung together with linework in real time.

25 Store Point After you tap the OK button, you are prompted with a Store Point Information screen. The intent here is to pause and review this information. We were staking out Design Point 103, so our Store Point is 103_stk. It is at station (midpoint of 1000 foot line). It is at an offset distance of 5 feet, with an offset direction to the Right. The difference of the calculated elevation to the stored elevation resulted in a Fill of feet...next!

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