iCMTGIS PRO for soil & water application

Navigating back to a GPS point

“I am trying to find the right app for my application. What I need to do is use my iPad and Eos Arrow 100 GNSS receiver to collect and precisely navigate back to points on the ground. Getting back to the point with the subfoot precision my equipment is capable of has proven difficult with other apps because so many are based on my location being indicated by a large blue dot on an aerial photo or map. I need more precise navigation.”

As you can see from the Point Stakeout screen, there is a tiny green dot within the GPS marker to indicate the exact point location. When you get close to the target, you could turn off the Map.

For precise RTK surveying, users usually get the iCMTGIS PRO, which can get the GPS messages directly from the Arrow receiver and not have the data truncated by iOS. iCMTGIS PRO also provides many additional functions that you will find useful for your soil and water applications.

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How to convert Garmin GPS waypoints for importing to Stakeout iCMT

Garmin can export waypoints in GPX format. Some of our apps, like iCMTGIS III and iCMTGIS PRO, can import and export data in GPX format. These and a number of our other apps, such as Stakeout iCMT, can import Shapefiles.

A software program is required to convert GPX files to Shapefiles. If you have our PC-GIS 9, PC-GIS X, PC-GPS 9 or PC-MAPPER 9 software program, you can import the GPX file then export the data as Shapefiles.

Otherwise, you could do the conversion by using some other software program, such as the one at the following link.

http://freegeographytools.com/2007/exporting-gps-data-to-gis-i-garmin-gps-units

Using NEZ plane in iCMTGIS PRO to stakeout soccer fields

“Is this something your app could help us do with the EOS? . . . We are working with soccer field templates that are interchangeable between any field location. Right now, we have a survey Leica GPS that we can match 2-3 points (usually corners of the field) to the template points. The receiver then matches the rest of the field points. Then we can use navigation to mark the rest of the field. . . . I’m attaching our template pdf as an example and a csv of the points we currently use.”

Yes, we have customers who do geo-referencing and engineering stakeout using iCMTGIS PRO.

The procedure is as follows:

1. Your templates are based on a local coordinate system in the drawing software used for making the templates.

Suppose corner 1 is at (1000, 1000), and the diagonally opposite corner is at (1100, 1200).

You can define a NEZ plane in iCMTGIS PRO by matching the GPS LAT-LON values at these two corners to the (1000,1000) and (1100,1200) NEZ coordinates.

So, you would first record accurate GPS latitude and longitude coordinates at these two kitty-corner points using your EOS receiver. You can use the data collection function in iCMTGIS PRO to record these positions. In the Static Point mode the app will let you stand at each point for 5 or 10 minutes then average all the readings to yield a more accurate result.

To define a NEZ plane in iCMTGIS PRO, first select MENU – Setup then select the distance unit.

Select NEZ. Confirm to set up a new NEZ coordinate system. Tap on Edit.

Enter the plane name of your choice then tap on Control Point.

With “Reference Point” selected as the Control Point, enter the GPS coordinates for the starting point and the corresponding X, Y values. In our example, it would be X = 1000 and Y = 1000. Make sure you specify the correct N, S, E, W designation for the GPS lat-lon.

Now select “Control Point” the Control Point. Enter the GPS coordinates for the other corner and the corresponding X, Y values. In our example, it would be X = 1100 and Y = 1200. Make sure you specify the correct N, S, E, W designation for the GPS lat-lon.

Tap on OK a couple times to go back to main map screen.

2. As you have a text file for the points in your template, you can use Topic Menu – Import TextFile” to import the points and get them displayed in iCMTGIS PRO. If you do not have a text file, you could use the Add Point by Coordinates function in iCMTGIS PRO to add each corner point and enter its X,Y coordinates.

3. Use Setup – Coordinates to switch to the LLA system (lat-lon).

4. Now use GPS – Point Stakeout to mark the points on the ground.

Using Deed Calls & Stakeout to locate property corners

“I had a topography company locate the northern two corner stakes for my trapezoidal property. I am trying to locate the southern two. I purchased your product Deed Calls and Stakes for my iPhone 7. My hope was that I could go to the North east stake, have your app acquire the GPS coordinates of the stake and then move to the North West stake and do the same. From that I would like to walk down the fence line and have your app tell me when I am 1440’ from that stake… should be right at the South West stake. . . . I don’t have typical x Deg N, y Deg E coordinates.”

Normally, you would get the first node position then use the deed document and enter the deed calls to plot out the property boundary. Then you would use the Line Stakeout function to help you walk along the boundary. The Line Stakeout will show you your Station value. The default Station value at the beginning point is 0′. Therefore, the Station value would be the distance you have walked.

It sounds like you have a fence to follow all the way to the southern two stakes from the northern two corners. This means you could use the Point Stakeout function to help you determine when you are a specific distance from, say, the northwest stake. You could try the following steps, but keep in mind the accuracy of your work will depend on the GPS receiver you use. The GPS on the iPhone is not that accurate. Many users use an external Bluetooth GPS receiver to obtain better accuracy. High-accuracy receivers have a high price tag. Hopefully there are markers at the southern two corners to help you confirm the location when you get to the vicinity.

I. Create a node then use Point Stakeout

1. Turn GPS on and wait a few minutes. Walk to the Northwest corner.

2. Follow the instructions under Open a Deed Calls File in the Help document to create a Job.

3. Follow the instructions under Set First Node and Symbolism and use Pick GPS to get a node at your position.

4. Tap the Line tab then tap the Calls button.

5. Tap the Add button to add a line. Accept the displayed values by tapping on the Back button. When app displays “Update Feature?”, tap on Yes. Now you have created 2 nodes. The one at the GPS marker is the Northwestern corner.

6. Follow the instructions under Point Stakeout. For the Target Feature select the Line you have created. The node you are interested in is Node 1. Now when you walk away from that position, you will see the separation distance displayed in the Range field.

7. Walk along the fence southward and stop when Range shows the target distance. Tap the Store Stake Point icon to store this point.

II. Use Line Stakeout

As the partial map you provided shows S83-53-00E 645.50′ for the southern border, you can use the Deed Calls function to create a Line that represents this southern border.

1. Go back to the Deed Calls screen and change the First Node location by tapping the Pick button then tapping on the Point that you have created at the southwest corner.

2. On the Calls page, tap the Edit button then enter the bearing and distance information:

Horizontal Angle: S83-53-00E

Horizontal Distance: 645.50

3. Tap the Back button and confirm to update the Feature.

4. Now you can follow the instructions under Line Stakeout to move along this line to get to the Southeastern corner and store the stake point.

Does the deed call and stakeout app have all the features of both applications?

The Deed Calls & Stakeout app will let you enter deed calls to draw a deed plot. Then you could use the Point Stakeout function to help to get to any node on the boundary of the deed plot. Or, you could use the Line Stakeout function to help you stay close to the boundary line while walking around the property.

The Deed Calls & Stakeout app only works with the nodes in a deed plot.

On the other hand, the Stakeout iCMT app will let you add Points, Lines and Areas manually or import them from Shapefiles.

 

Stake out using iPhone device

“I search application to stakout a polyline with my iphone. I see you make this for ipad but i don’t see for iphone.”

The Stakeout iCMT app can run on iPhone and iPad devices.

If your polyline is stored in a DXF file or as Shapefiles, you can import it into the “Stakeout iCMT” app and let the app help you stake it out.

The accuracy of your work depends on the GPS used. The iPhone GPS is not quite accurate. You can get a compatible external Bluetooth GPS (such as Dual XGPS-150A or Bad Elf GPS) to achieve about 2 – 5 m horizontal position accuracy. High-precision GPS receivers will cost a lot more than these GIS-grade GPS receiver.

Can I use iCMTGIS PRO on my iPad to stakeout to survey points and also develop custom data collection forms?

1. Stakeout to survey points

The GPS – Point Stakeout function in iCMTGIS PRO can take you to the survey points. How close you can get to the survey points depends on the GPS receiver. The built-in GPS of an iPad device has an accuracy of about 10 meters (sometimes better, sometimes worse). If there are markers on your survey points, then you could identify the marked points after you get to its vicinity. Otherwise, you will need a high-precision GPS receiver, such as the EOS Arrow or iSXBlue II GNSS to take you closer to the point position. To pin-point a previously surveyed point, you will need to connect the EOS Arrow 200 or iSXBlue II GNSS to a RTK network in your area.

2. Custom data collection forms

The GPS – Collect function will let you record Attribute values during data collection. You can use the GPS – Feature List function to set up the Features/Attributes/Values for your project. Similar projects can share the same Feature List.

GPS Feature Data Collection

GPS Feature Data Collection

You can set up custom value lists to facilitate data collection. During GPS data collection you can have the app display the Attribute fields. You can enter data manually or select the desired data from the pre-defined list. The collected data can later be presented in Sheet View and edited.

If you are not after entering data while recording GPS positions, but are interested in designing your own report forms for entering data for a certain site, then please consider our Wetland & Stakeout app.