If you have a limited number of AeroPoints, flying larger sites can be challenging without a base and rover system to mark addition 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 will need to find suitable locations on your site with clear view of the sky and away from buildings, vehicles, metallic interference, and surrounding terrain. These areas will ideally be in locations where they will not be easily disturbed by future site activities.

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 begin collecting 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 using the normal process. 

Log in to your AeroPoint portal 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 your CSV file that you've now created for that site. 

To aid in quick identification of 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.

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