Topics

1

Python and Java API / exportRaster DEM Export fails with NullException

« on: January 13, 2021, 02:55:50 PM »

Hello folks,
i'm using a script to export DEM from a number of projects. It worked flawlessly for a few projects and in one project it produces an Exception. I'm running Metashape on 1.7.0 11736.
What could be the problem? Export works from the GUI.

Code: [Select]


utm_NRW = Metashape.CoordinateSystem("EPSG::25832")
projection = Metashape.OrthoProjection()
projection.crs = utm_NRW

chunk.exportRaster(
        source_data=Metashape.ElevationData,
        path="G:/THS-data/data-processing/1-6/out/data/dsm.tif",
        projection=projection,
        image_format=Metashape.ImageFormatTIFF,
        resolution_x=0.01,
        resolution_y=0.01,
        white_background=False,
        clip_to_boundary=False,
        save_alpha=False,
        save_scheme=True)


Log:

ExportRaster: clip_to_boundary = off, image_format = TIFF, path = G:/THS-data/data-processing/1-6/out/data/dsm.tif, projection = ETRS89 / UTM zone 32N, resolution_x = 0.01, resolution_y = 0.01, save_alpha =
off, save_scheme = on, source_data = Elevation, white_background = off
Traceback (most recent call last):
  File "export-data.py", line 95, in <module>
    exportDataFromProject(project_file.as_posix())
  File "export-data.py", line 86, in exportDataFromProject
    exportDataRaster(chunk, export_location,
  File "export-data.py", line 48, in exportDataRaster
    chunk.exportRaster(
Exception: Null elevation

DEM Details
Size   14,475 x 18,681
Coordinate system   WGS 84 (EPSG::4326)
Reconstruction parameters   
Source data   Dense cloud
Interpolation   Enabled
Processing time   1 minutes 50 seconds
Memory usage   365.99 MB
Software version   1.6.1.10009
File size   381.68 MB

2

General / How to project feature pixel-annotation to orthomosaic

« on: June 22, 2020, 07:11:12 PM »

Hi,
the raw images that were input to Metashape have corresponding pixel-wise feature annotations to classify regions of the image. The raw images were processed to orthophotos.

Is it somehow possible to project the annotations using the same projection as the original images use such that the pixels align?

Furthermore, is it possible to do it the other way around i.e. the orthophoto is annotated and then project to the original image?