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micasense / imageprocessing

MicaSense RedEdge and Altum image processing tutorials
https://www.micasense.com
MIT License
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QUESTION: 64-bit image output #137

Closed hjken closed 3 years ago

hjken commented 3 years ago

I modified Tutorial 1 to get reflectance images for an image set but when I tried to input them into another program (WebODM) to create an orthomosaic I got an error that the program does not accept 64-bit images. I was surprised because the original images (from MS RedEdge) are 16 bit. So, to check, I saved the converted reflectance image (tiff) created in Tutorial 1. It also is a 64-bit image. Could someone explain why the output of Tutorial 1 is a 64-bit image when Tutorial 1 is just converting DN values to reflectance values, it is not creating a stacked image?

poynting commented 3 years ago

The flightReflectanceImage array is double precision floating point. The output format of the image will depend on how it is written to a file.

If using GDAL to save out the reflectance image, it is possible to define the output type of the resulting TIFF. For example in the save capture function, we write a 16-bit TIFF, where 32768 represents 100% reflectance (to provide some overhead for saturation in the case of specular reflections).

poynting commented 3 years ago

Closed due to inactivity.