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Author Topic: What is workflow to create a DTM?  (Read 4225 times)

thans

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What is workflow to create a DTM?
« on: June 28, 2016, 09:39:19 PM »
what is proper sequence of commands to create and output a DTM in addition to a DEM?

chunk.builddensecloud()
chunk.dense_cloud.classifyGroundPoints()
chunk.buildDEM(source=PhotoScan.DenseCloudData, classes=[2])
chunk.exportDEM()

??

Would difference of DEM and DTM provide height information of objects in the scene such as vegetation or plants adjusted for soil elevation?

Alexey Pasumansky

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Re: What is workflow to create a DTM?
« Reply #1 on: June 29, 2016, 11:59:30 AM »
Hello thans,

I think should be like you've described:

Code: [Select]
chunk.buildDenseCloud()
chunk.dense_cloud.classifyGroundPoints()
chunk.buildDem(source=PhotoScan.DenseCloudData, classes=[2])
chunk.exportDem()

But please note that only one digital elevation model can be stored in the chunk at the same time, so if you wish to keep both DSM and DTM you need to duplicate the chunk after generating the dense cloud.

Also you might need to use non-default parameters for dense cloud generation and classification and fro building DEM and export.
Best regards,
Alexey Pasumansky,
Agisoft LLC