Module that extracts contour lines from a raster. Algorithm comes from jai-tools, which used the Conrec contouring subroutine.
Inputs
- the raster on which to calculate the contours
- the minimum value for the contours
- the maximum value for the contours
- the contours interval
Output
- the generated contour lines vector
Notes
The module has a couple of known issues:
- it missbehaves if there are cell values that happen to be equal to the contour values (see above referenced article for further explanation).
- isolines can accumulate at image borders