[gdal-dev] Convert grid to polygon shapefile

[Brent Wood]

 I have done this with QGIS, if you have a grid with categorised values, QGIS can generate a polygon shapefile with the cell boundaries merged by cell value.
QGIS uses gdal_polygonize.py under the hood to do this (via a simple GUI interface), so if you work out the command line parameters you need, you could run it from the command line.

HTH,
Brent Wood


On Fri, 7 Apr 2023 at 10:34, Paul Meems <bontepaarden at gmail.com> wrote:

Hello List,I'm working on a C# application that uses Golden Software Surfer to create maps, but I also need to export the data to a polygon shapefile. Unfortunately, Surfer creates a shapefile with shapes on top of each other instead of inside each other, and Golden Software support couldn't help with this issue. 
I have a grid-file in Surfer Bin Grid format that can be converted to other raster formats, a border shapefile created using ST_Convexhull, and a text file indicating the values of the polygons. 


Can anyone recommend a way to use GDAL/OGR to make a polygon shapefile from these resources, or suggest an alternative approach?
Regards,
Paul

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