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Author Topic: Mesh VS DEM orthomosaic  (Read 1398 times)

z-air

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Mesh VS DEM orthomosaic
« on: October 03, 2018, 05:29:27 AM »
Can someone explain to me what the difference is with Ortho's when selecting either Mesh or DEM as its source? I've ran both and the data looks the same to me but generating a Mesh Ortho takes much longer then using DEM.

stihl

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Re: Mesh VS DEM orthomosaic
« Reply #1 on: October 03, 2018, 12:06:32 PM »
In previous versions of Photoscan there was no option to create a DEM, only to create a Mesh. The Mesh and DEM are similar in that they are both models from the interpolated Dense Cloud. If you're unsure if you need a Mesh for your products simply stay with creating DEMs.

Using a DEM will sometimes yield better results when creating True Orthomosaics (an Orthomosaic based on a DEM and not a DTM) near building edges than using a mesh. This is because a DEM is interpolated using IDW whereas a Mesh is using linear interpolation to create a model.