Exporting 1 multiband orthomosaic raster (Altum camera used)

[michaldolnik]

 I am trying to export single *.tiff file - multiband.

In this case I am using Altum camera and I want to export one file with single bands, no indexes, just normalized values [B1/32768, B2/32768, B3/32768, B4/32768, B5/32768].

I am trying to achieve it like this:

Code: [Select]

doc.chunk.raster_transform.formula = ['B1/32768', 'B2/32768', 'B3/32768', 'B4/32768', 'B5/32768']
doc.chunk.raster_transform.calibrateRange()
doc.chunk.raster_transform.enabled = True
doc.chunk.exportRaster(path=output_file,
projection=projection,
nodata_value=cfg["buildOrthomosaic"]["nodata"],
source_data=Metashape.OrthomosaicData,
raster_transform = Metashape.RasterTransformValue,
image_compression=compression)



But I am getting the wrong result.

Do you have some advise?

Thanks
M

[Alexey Pasumansky]

Hello michaldolnik,

Is the problem observed only with the Python-based export or using the similar approach for GUI export also results in the incorrect output?

[michaldolnik]

Hello Alexey,

I have already found out where the problem was. All I had to do is to set up parameter save_alpha=False in exportRaster method.

Now the raster is exported well.

[Alexey Pasumansky]

Hello michaldolnik,

Thank you for letting me know, that the problem has been resolved.

Some post processing and analysis applications may misinterpret transparency in alpha-channel. MicaSense also gives their recommendations to switch off Save Alpha option:
https://support.micasense.com/hc/en-us/articles/360002693373-Process-MicaSense-sensor-data-in-Agisoft-Metashape

[michaldolnik]

Hello,

yes, I see now.

Thank You

Regards,
Michal