Pixel information (angle of incidence, distance and footprint area)

[neavrys]

Hi All,

In case of IR imagery in radiance, sometime we want to transfer back in temperature or even an energy index or an indicator. To achieving this, there is information that is needed to retrieve.

• The off-nadir angle or the angle of incidence
• The distance between pixel and the sensor
• The footprint area of the pixel before resampling

Actually, we compute the angle and the distance with GDAL by old fashion triangulation of the camera pose and the pixel coordinate which include elevation extracted from the DEM. This process is run over each pixel of all orthophotos. Everything is in UTM coordinate system to make everything easier. After we create our own mosaic, keeping computed info in other bands.

Footprint area is another concern. Projection of pixels corner from the image through camera pose calculate the area.

I’m quite confident that Metashape could make our life easier. By not using GDAL, and maybe retrieved proper camera pose directly for each pixel directly from the orthomosaic.

In that context:

Is it possible to compute angle and distance using Metashape API instead of our own GDAL brew script?
Is it possible through Metashape API to retrieve the image source (camera pose) of each pixel from the orthomosaic?
Or is there any way of possible simplification of our process?

This post https://www.agisoft.com/forum/index.php?topic=11072.0 show it possible the link camera pose (image) and sparse cloud.

The idea would be to add each information into band separately.

Many thanks,

Alex