[GIS] How gdal_rasterize works – how it interpolates / resample values

Question

I have huge number of points saved as shapefile.

I created an empty raster file with low spatial resolution. Next, I applied gdal_rasterize on mentioned .shp and used low resolution raster as destination.

It works, but since I didn't provided an resampling method, I wonder which algorithm has been applied to prepare raster for me.
Unfortunately, I can't find this information within the GDAL documentation: http://www.gdal.org/gdal_rasterize.html

Answer 1

gdal_rasterize doesn't perform any interpolation or resampling.

By default it updates pixels under a point, on the line render path, or whose center point is within the polygon. But you can choose to update all pixels touched by lines or polygons with the -at flag.

-at:

Enables the ALL_TOUCHED rasterization option so that all pixels touched by lines or polygons will be updated, not just those on the line render path, or whose center point is within the polygon. Defaults to disabled for normal rendering rules.

If you want to interpolate between your points, you can use gdal_grid.