ST_Contour — Generates a set of vector contours from the provided raster band, using the GDAL contouring algorithm.
setof record ST_Contour(
raster rast, integer bandnumber, double precision level_interval, double precision level_base, double precision[] fixed_levels, boolean polygonize)
;
Generates a set of vector contours from the provided raster band, using the GDAL contouring algorithm.
When the fixed_levels
parameter is a non-empty
array, the level_interval
and level_base
parameters are ignored.
The polygonize
parameter currently has no effect.
Use the ST_Polygonize function
to convert contours into polygons.
Return values are a set of records with the following attributes:
The geometry of the contour line.
A unique identifier given to the contour line by GDAL.
The raster value the line represents. For an elevation DEM input, this would be the elevation of the output contour.
Availability: 3.2.0