556 geometry extrusion

[ar-chad]

#556

[jabhay]

• As discussed in the meeting, final step required is to add the requirement for the function in spec/sections/11-geometry_extension.adoc

[jabhay]

• New requirement identified to add a function to enable extrusion by height: geof:extrudeToHeight

[mperry455]

geof:extrudeToHeight needs to be added here.

[ar-chad]

added

[mperry455]

I'm wondering if "distance" may be a little vague here. What about something like where the 'height' indicates Z values for points at the "top" of the extruded 3D geometry?

[ar-chad]

@mperry455 I corrected this accordingly to your suggestion. It is also aligned with H2GIS example http://www.h2gis.org/docs/1.5.0/ST_Extrude/

[jabhay]

• Need to consider and address the unit of measurement for height. The function without a parameter or unit in the name should use the unit of measurement of the CRS. @ar-chad is looking at what other technologies do.

[ar-chad]

• Need to consider and address the unit of measurement for height. The function without a parameter or unit in the name should use the unit of measurement of the CRS. @ar-chad is looking at what other technologies do.

The only implementation in open source databases I found was H2GIS, which adds the height to the Z coordinates. http://www.h2gis.org/docs/1.5.0/ST_Extrude/ They provide only example of that when Z is 0, but it doesn't always have to be and it does not have to be the same value for all Z coordinates of the base geometry.

[mperry455]

We proposed the following naming changes during the 4/30/2025 SWG meeting to avoid misunderstanding of function behavior based on function name. extrudeToHeight() could be confusing if initial Z coordinate values were non-zero.

1. extrude() -> extrudeByLine()
2. extrudeToHeight() -> extrude()
3. extrudeInTime() -> no change

[ar-chad]

We proposed the following naming changes during the 4/30/2025 SWG meeting to avoid misunderstanding of function behavior based on function name. extrudeToHeight() could be confusing if initial Z coordinate values were non-zero.

✅ 1. extrude() -> extrudeByLine()
✅ 2. extrudeToHeight() -> extrude()
✅ 3. extrudeInTime() -> no change

Done and ready for review a19e1fa

[situx]

Looks good to me