Establishing Permanent Ground Control with Your AeroPoints

If you have limited AeroPoints, flying larger sites can be challenging without a base and rover system to mark additional ground control. 

This article will walk through steps to use AeroPoints to create permanent ground control points (GCPs), and generate a CSV file to use in addition to your AeroPoints when uploading a dataset.

First, you must find suitable locations on your site with a clear view of the sky and away from buildings, vehicles, metallic interference, and surrounding terrain. These areas will ideally be in locations where future site activities will not easily disturb them.

Once the locations are identified, use the marking stencil included with the AeroPoints to mark the ground with a color-contrasting paint or another permanent marker that will be easily visible from the sky when flying your site

Place an AeroPoint precisely over the marked location and turn it on to collect data. Allow the AeroPoint to collect data for at least 45 minutes. 

Note: the longer the AeroPoint is left out, the better the point will be for future site surveys.

After AeroPoint data collection is complete, upload the AeroPoint data to your portal.

Log in to your AeroPoint Dashboard and process the survey by clicking the PROCESS NOW button. 

Once processing is complete, download the CSV (simple) file for future use during full site surveys.

When you're ready to conduct a data capture of your site, lay out your AeroPoints as you normally would, with adequate spacing between the newly established permanent controls across your site, and fly the site as you normally would.

Upload your new flight data to the portal and select AeroPoints + CSV when choosing your ground control method. 

Select the appropriate AeroPoint capture and upload the CSV file you created for that site. 

You will need to subtract the height from the elevation of each AeroPoint before uploading the CSV. If you are using AeroPoint 1s, subtract 3.2 cm. If you are using AeroPoint 2s, subtract 2.6 cm.

To aid in quickly identifying the permanent markers, add a note in the comments section at the bottom of this step that includes a brief description of the target (color and shape if different from the AeroPoint stencil).

Another method to extend ground control is to use the "leap-frogging" technique for sites that change rapidly, preventing permanent marker placement.

I still can't do it!

We wrote these articles to equip you with everything you need to get the job done on your own, but we understand that sometimes this isn't sufficient.

If you're stuck, you can connect with our support team by clicking the support button on the top right corner of your user portal.