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Useless DEM´s

HI MME Team,

I want to consult about a recurring problem with the DEMs that MME generates.
The last ones I have done have resulted in a strong deformation of the whole DEM, creating an excessive curvature of the terrain in both directions, with the centre of the scene higher than the extremes, without representing the actual terrain shape at all.
How can we solve this deformation? Your DEMs are useless otherwise.

Regards

Santiago

Santiago Valdez

تعليق رسمي

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We are sorry to hear you are not happy with your results.

The first step towards getting a good elevation result is using at least 80% overlap in your data collection.

Even overlap is another contributor. If you have missing or gappy data collection the results will be inconsistent.

Another important factor is making sure that all of your images are collected while traveling forward and while traveling the same speed. This will minimize the differences in the footprint that is captured due to the rolling shutter.

Using a high quality camera will help get you high quality results. 

Including a Ground Reference image that is taken at the single take off location will give the best results. 

None of our outputs are going to be perfect. Depending on your needs some GIS finish work may be required. 

Zane
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