Staking out contour lines

“i am looking for an app that will allow me to find and walk a contour line so i can mark it. Will the coconut – volume-stakeout app be the one i need?”

Do you have the contour lines as Shapefiles? If so, you can import them into the Stakeout iCMT app. Then you could select one of the contour lines and use the Line Stakeout function to walk and mark the contour line.

The Contour – Volume – Stakeout app provides the stakeout functions as well as the ability to create the contour lines for an area if you have the elevation data for many points scattered throughout the area. It does not appear this applies in your case.

Please note that the accuracy of your work will depend on the GPS receiver used. If you require good accuracy, then you will need to get a high-precision GPS receiver (such as the iSXBlue II or an EOS Arrow) to do the stakeout.

Also, please keep in mind that a set of Shapefiles containing too many contour lines can overload the system memory of your device.

How to tell if an app is using Location Services?

The Location Services is shared by the iOS system and all the installed apps.

To check which apps are using the Location Service, please call up Settings\Privacy\Location Services. On the right side of the list of apps look for an arrow mark.

If an app name has a purple arrow mark on the right side, it is actively using the Location Services.

A gray arrow indicates that an app has used the Location Services within the last 24 hours.

iCMTGIS II closes after iOS 10 update on iPad mini

“I have a copy of iCMTGIS II, recently updated/last week, running iOS version 10.2.1 (14D27) on iPad mini/gen 2. With ‘gps on’ and upon tapping ‘Collect’ to collect data, the app closes and doesn’t allow data to be collected. The app remains open in the background, i.e. doesn’t close out, but upon selecting ‘Collect’ again, it repeats the same issue and will not allow data collection.”

We asked the user, “Have you tried uninstalling and reinstalling the iCMTGIS II app?”

The user replied, “the un-install/re-install worked. . . . thought of un-installing/re-installing but had never done that with an iOS app since it is a download from the app store, but now I know I can. thanks!”

It is possible that the iCMTGIS II app was still open when the user did the iOS upgrade. Before an iOS upgrade, it’s best to close out all running apps. You can do so by double-clicking the Home button then swiping up the displayed app screens.

Can I use Contour – Volume – Stakeout on its own?

“Can the above mentioned app be used on its own or if it requires supporting software and with an iPad gps or does it require an external gps? Also, can you provide me with a brief description on how to use it, i.e. Can I just walk around the boundaries to create the shape of a paddock then parallel to the fence lines to create the contour map or is it more involved than that?”

The Contour – Volume – Stakeout app can be used on its own with respect to generating contour lines and computing cut/fill volume. However, whether the app is suitable for your purpose depends on a few factors.

As the Help document shows, to generate contours, there needs to be altitude data spread throughout the region of interest. If you have a Shapefile, a DXF file or a text file that contains the needed X,Y,Z data, you can import such a file into the app to generate the contour lines. If not, you could digitize the X,Y locations for which you know the altitude and enter the Z value manually. However, this will be a very slow process.

We do have an iCMTGIS PRO app that provides GPS/GIS data collection functionality as well as the contour, volume and stakeout functions. Using iCMTGIS PRO and a high-precision external GPS receiver (such as the EOS Arrow or the iSXBlue II), you could record the X,Y,Z data for a grid of points within the area of interest as well as the shape of the area. Then you could contour the region. The GPS that comes with an iPad or an iPhone have an accuracy of about 10 meters or worse.

We also have PC apps that will let you load a USGS digital elevation model (DEM or SDTS) data file for use in generating contour lines for an area in the corresponding region. In this case, you will just need to digitize or use GPS to record the shape of the area of interest.


If we do purchase it, is there a charge for future updates/versions of the app?

If the app name and version stay the same (such as iCMTGIS III), there will be no charge for update releases. There are no annual subscription fees of any kind.

EULA for the iCMTGIS apps

“Could you forward a copy of the EULA so we can verify it meets our Company’s policies for software purchases?”

We have adopted the standard Apple iOS apps EULA for our iOS apps. Please find this End User License Agreement document at the following link:

10/14/16 Renting iSXBlue II GNSS or EOS Arrow receiver

“Although the buying price for the iSXBlue II GNSS is too high for our project, I did find a company in OH, that would rent it to me for a very decent price for a week.”

This user informed us that has iSXBlue II GNSS for rent. It looks like they also have EOS Arrow for rent.

If you have a temporary short project to do that requires the use of a higher precision GPS receiver, this could be a viable solution.