Python API: selecting a specific DEM to use for buildOrthomosaic

[djyoung]

Hello -- I believe that multiple DEMs generated by the `buildDem` step (such as a DTM and DSM) can exist simultaneously in the same project (correct?). How do I specify which one I would like to be used as the basis for the `buildOrthomosaic` step? The options for the `surfaceData` parameter of `buldDem` are `Metashape.DataSource` objects, which include, e.g., `ElevationData`, but not a way to specify *which* elevation data product to use. Is there a way to "activate" the desired `ElevationData` product so that it is used for `buildOrthomosaic`?

Thanks,
Derek

[olihar]

The default selected one is used.

[djyoung]

OK, thanks. How do I change the default selected one via the Python API?

[Alexey Pasumansky]

Hello Derek,

To set the DEM as active you can use the following code line:

Code: [Select]

chunk.elevation = chunk.elevations[0]this example will make the first DEM in the chunk active.

[djyoung]

Thank you Alexey! Would I be correct to assume that the DEMs are indexed in the order they were created?

[Alexey Pasumansky]

Hello Derek,

If the DEMs are reordered manually (using drag&drop) in the Workspace pane then their indices in chunk.elevations list will be also changed.

Unique DEM numbers can be tracked as elevation.key. Also you may consider some additional information from elevation.meta, for example, elevation.meta['Info/LastSavedDateTime'].

[djyoung]

OK, thank you Alexey.