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How to address Drone2Map GCP warning? Points interpolated from 2m DEM

Question asked by mmilner on Jun 18, 2019
Latest reply on Jun 18, 2019 by CBenkelman-esristaff

I'm trying to process ag field data for which I don't have control points.

- Identified relatively stable areas in a 2m resolution USGS DEM (presumably NAVD88)

- ArcGIS interpolated elevation values for points located at those ~stable areas

- Created csv file of x,y,z values

- Imported the file to D2M and a yellow triangle warning appeared by each entry

- Report says the points aren't being used.

- Used default gravity model for CGPs.

I've attached a report from one of the more "successful" runs that shows a fictitious deep hole at the east edge of the field.

 

The USGS DEM suggests a road used to run along (and inside) the east field's edge. The linear feature is slightly depressed from the rest of the field. I positioned 3 GCPs along that likely road to assist the analysis... but the GCPs weren't used.

 

Second, related question... could such a linear feature "confuse" D2M's algorithms?

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