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.


Shapefiles for Chile shows up in North America

“We update de FORESTER GPS GIS II, on iPad from version 1.0.1 to 1.0.2 and we are having issues with the coordinate system when importing a shape file.The shape appears in North América and we are from Chile. We use UTM with Datum WGS84. Is there any suggestion on what can we do. I try this in two different devices with the new version and both have the same problem. When using it in the 1.0.1 version all goes OK.”

Please make sure you have selected the correct UTM Zone.

Please also copy the .prj file for the Shapefiles to the documents folder for Forester GPSGIS II.

What coordinate system do the Shapefiles use? If they are based on WGS 84 LLA, then try setting the Forester GPSGIS II to that coordinate system before importing the Shapefiles. After importing the Shapefiles, then change the coordinate system to UTM WGS84.

How to record the RMS value displayed in iCMTGIS PRO?

In the “Enable the External GPS” mode, iCMTGIS PRO can display on the GPS Status line the RMS value sent over by such GPS receivers as the iSXBlue II GNSS, SXBlue Platinum and the EOS Arrow series GNSS receivers.

Some iCMTGIS PRO users have requested the ability to save the GPS RMS information along with the recorded Features. We are working on adding the RMS value and some other GPS status information to the built-in Attributes List. When the new built-in Attributes List is available, you will be able to select the RMS from the list and add it to the Feature Topic as an Attribute. Then the RMS values for the Features recorded via the GPS Data Collection function will show up in Sheet View, and you will be able to export them along with the other Feature information.

Does the Arrow 100 work with iCMTGIS III or only with iCMTGIS PRO?

The Arrow series GPS receivers work with both the iCMTGIS III and the iCMTGIS PRO.

iCMTGIS III gets the position from the iOS CoreLocation, to which the GPS receiver sends the location information. As CoreLocation truncates the data, accuracy is compromised.

iCMTGIS PRO has all the functionality of iCMTGIS III plus the ability to receive and parse the NMEA message stream directly from the Arrow GPS. iCMTGIS PRO provides the “Enable the External GPS” mode to interface directly with the Arrow GPS receiver. In this mode, the app can display a GPS status bar in real time. It will also let you set a limit on PDOP and RMS to help ensure data quality.

How to enter coordinates into the Stakeout iCMT app

“I am trying to enter a GPS coordinate into the stake out program, and I am getting some weird results. For some reason the coordinates that I have taken off of google earth are taking me to some point in Inner Mongolia instead of Silverton Oregon. I am using the same format of Degrees, Minutes, Seconds. Could you please tell me what I’m doing wrong?”

Which function are you using to enter the coordinates. If it is the “Locate a Point by Address” function, please make sure to specify the correct E, W, N, S designation.

Another way to enter the coordinates is to get the map for your approximate location displayed then use “Add Point manually” to add a point to the map. Then open the Feature Properties screen for that point and change the coordinates to the desired values.

Is there a video tutorial to show me how to set up a Feature List?

We’ve just uploaded a new video tutorial. Here you go:

App to help plant trees?

“I am wondering if any of your programs could be used in my tractor as a way to guide me in driving a straight line when planting Christmas trees? Even if it doesn’t help me row by row could it be used to help me lay out a planting? Help to drive the first line across a field?”

The GPS system you will need to guide a tractor along a line to plant Christmas trees requires a high-precision GPS receiver used in conjunction with an app that will let you record a few reference points, draw the line on the map and guide the tractor along the line.

The actual equipment and app you select will depend on the accuracy you wish to achieve. Of course, a high-accuracy system comes with a high cost.

The SXBlue Platinum and EOS Arrow Gold GPS receivers can be used with iCMTGIS III to achieve sub-meter accuracy.

The SXBlue Platinum and EOS Arrow Gold GPS receivers can be used with iCMTGIS PRO and a RTK network to achieve cm-level accuracy.

As there will also be visual cues to guide the tractor, do you think sub-meter accuracy will be sufficient for you?

Both iCMTGIS III and iCMTGIS PRO will let you load a geo-referenced background map (*.tif. *.pim or *.bmp). These are useful as a general reference, but they are not accurate enough to let you pin-point your first point or line by digitization.

You could use iCMTGIS III with a SXBlue Platinum or an EOS Arrow Gold GPS receiver to record the property boundary and the starting point to sub-meter accuracy. iCMTGIS III and iCMTGIS PRO will let you create a grid over the property to indicate where the trees are to be planted.

iCMTGIS III and iCMTGIS PRO provide the Stakeout functions to guide you along the grid lines. These apps will display how far the tractor deviates from the line. You could also set up the apps to keep beeping as long as the tractor stays on the line within the specified tolerance.