pixel_metrics-zmean is inconsistent between adjacent processed areas

[mkieser]

I am running the pixel_metrics (.stdmetrics_z, resolution = 5) on first returns of two adjacent normalized lidar datasets and the results for zmean on the two datasets are quite different, and drastically noticeable where the two datasets are adjacent.

[bi0m3trics]

First thought - are the first return point densities the same between the two datasets? zmean would be highly sensitive to differences in density (as opposed to say, something like zmax).

[Jean-Romain]

Or simply you loaded the two rasters one after the other independently in QGIS and the color scheme are different because colors are attributed independently to each raster. If loaded as one raster it will look good. I'm highly confident that pixel_metrics() is not involved here.

[mkieser]

When I join the two LiDAR datasets, run the same algorithm and style the same, the distinction disappears. The values in the derived product from the left dataset are exactly the same as the combined, the right are are different.