I'm trying to generate contour lines/isolines from groundwater points (groundwater depth) with SAGA (I tried before with QGIS, contour plugin, but the result was not good looking, too angular lines).
I have uploaded my groundwater points into SAGA, but I can't find the right tool or the steps to draw the contour lines. Can somebody tell me the steps to do it?
Do I need to generate a grid first ?
Best Answer
Yes you need to create the grid first and then create contour lines from the grid.
SAGA GIS has many tools to interpolate from points, which you can find them from
Geoprocessing -> Grid -> Gridding -> Interpolation from Points
, as you can see below:You need to test several tools and choose the one that fits your needs.
Then from
Geoprocessing -> Shapes -> Grid -> Vectorization -> Contour Lines from Grid
, you can extract the contour lines from the interpolated grid you did in the previous step.