On 10/15/2025 1:09 AM, Rahkonen Jukka wrote:
Hi, Could you ask the author of the PHP library to be more specific and refer to the correspointing parts of the shapefile specification https://www.esri.com/content/dam/esrisites/sitecore-archive/Files/Pdfs/library/whitepapers/pdfs/shapefile.pdf? I think that PolyLineZ and PointZ applies to your data. What they see and what they suppose to see in the binary content? Do they mean that the Z array is too short and does not contain a height value for the last shape? In the shapefile specification 3D is supported for XYM geometries, but having Y requires also M and shapefiles with heights are actually 4D (XYZM). However, the M array is marked as optional in the table 14 of the specification. I believe that what GDAL does with XYZ linestring data is to create a shapefile with shape type 13, that is by the definition XYZM, but it does not write the optional M array at all. The result is effectively XYZM without M, thus XYZ.
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