Raster Meets Point Data - Open Source Geospatial Tools: Applications in Earth Observation - page 140

Fig. 10.1 Search ellipse used to find points for the interpolation method
angle
Angle of search ellipse rotation in degrees (in degrees and counter clockwise,
default 0.0).
max_points
Maximum number of data points, only to be used for invdist algorithm: do not
search for more points than this number. This is only used if search ellipse is
set (both radii are non-zero). Zero means that all found points should be used.
Default is 0.
min_points
Minimum number of data points, only to be used for invdist and average algo-
rithms. If less amount of points found the grid node considered empty and will
be filled with NODATA marker. This is only used if search ellipse is set (both
radii are non-zero). Default is 0.
nodata
NODATA marker to fill empty points (default 0.0).