DistanceOp::distance(): make it return +inf instead of 0 if one of the geometry is empty#1345
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rouault merged 2 commits intolibgeos:mainfrom Jan 24, 2026
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… geometry is empty Fixes OSGeo/gdal#12978
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Note GEOS current behavior regarding empty geometries and distance reflects JTS one (CC @dr-jts ) |
lbartoletti
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Dec 17, 2025
| } | ||
| if(geom[0]->isEmpty() || geom[1]->isEmpty()) { | ||
| return 0.0; | ||
| return std::numeric_limits<double>::quiet_NaN(); |
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There is (/was?) a PostGIS page that explains this difference between the GEOS and SFCGAL backends. GEOS returned 0 (before this PR), while SFCGAL returned Inf.
When I asked why Inf rather than NaN, I was told that:
- NaN: was for invalid operations or errors.
- Inf: the geometry exists, but it does not contain any points.
So, here, I also tend to lean towards Inf, as you suggested in your comment Calling Distance on an empty geometry returns 0 OSGeo/gdal#12978 (comment)
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I'm fine with Inf too
… geometry is empty
rouault
changed the title
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Changed to returning +Inf |
dbaston
approved these changes
Dec 18, 2025
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Fixes OSGeo/gdal#12978