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Topics - kfish

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Hi All,

I am brand new to Agisoft as I just starting using it to construct orthomosaics and DEMs for my PhD research. I am working with a ~20 km x 8 km area that was surveyed at 15 cm resolution with 60% overlap. I managed to produce the orthomosaic without too much issue but then when I put together the DEM I realized that one region is reading far too high for elevation. When I went back to look at my camera alignment I noticed that many frames were showing elevation errors of up to 100 meters. The errors were so significant that is actual visible in the model of the cameras (see attached screenshot). I have other DEMs of the area and also know that it shouldn't be more than a few meters in elevation yet am getting far higher.

I don't have ground control points, so I am unsure on how to correct the error. I am have tried reprocessing the images and have both processed them as a complete set (all images from the 16 passes) and in small groupings of plane passes. The error is produced in both work flows.

I followed this tutorial to produce the products: https://www.agisoft.com/pdf/PS_1.2%20-Tutorial%20%28BL%29%20-%20Orthophoto,%20DEM%20%28without%20GCPs%29.pdf


Any ideas on how to fix the errors would be greatly appreciated! One thought I had was generating my own set of control points with lat/long/elevation based on the previous DEMs I have, but I am unsure if that would correct the error?

Thanks,
Kfish

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