Questions tagged [cgal]

CGAL (Computational Geometry Algorithms Library) is an open-source software library that provides efficient and reliable algorithms in computational geometry.

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PostGIS sfcgal ST_3DArea

I want to compute surface areas of a large CityGML data set. However, I ran into some issues, which I could not resolve or fully understand. The error message is the following: Polygon is invalid : ...
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File VERSION or include/CGAL/version.h are missing, required by release-build

I'm trying to compile CGAL libraries on fedora 27 but when I compile them using cmake ,it show's the following message: CMake Error: Unable to open check cache file for write. /home/xx/Documents/...
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error while running CGAl pacakge examples

I'm try to run "map_3_with_colored_facets" example which included in CGAL package but I faced some errors , it cannot read "Combinatorial_map.h" methods -cm.make_combinatorial_hexahedron() isn't a ...
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Adding Cgal headers after building package examples?

I'm beginner at using Cgal . I'm trying to run the examples which included in the CGAl package, I built the examples using Cmake and "make" command. but I'm facing a problem in including the header ...
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2 answers
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Postgis exact geometry from text

I have some geometry in cgal that I would like to export to postgis. The kernel I'm using is the same as what sfcgal uses (exact predicate exact construction), but I'm encountering some errors in ...
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SFCGAL compilation: How to specify CGAL path?

I'm a Linux newbie but nevertheless I want to install SFCGAL on OSGeoLive Virtual Machine (this is Ubuntu 14.04.4. LTS trusty). So first of all I had to get the dependencies, e.g. CGAL. Unfortunately ...
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4 answers
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How to determine if two points are on the same side of a LineString?

I have two points, A and B, and a line string L. A line string is formed by a sequence of points such that consecutive points are joined by a straight line. This is the same as a LineString in Geos - ...
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3 votes
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Using GIS data with CGAL

I read a few posts here at GIS.SE that points to useful algorithms in CGAL. I'd like to test algorithms in CGAL such as medial axis transformation/polygon skeleton extraction, but the examples on the ...
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How to build pgRouting with CGAL?

When running cmake for CGAL 3.9, I get the following output: root@postgresql local/CGAL-3.9# cmake -DWITH_CGAL_Qt3=OFF -DWITH_CGAL_Qt4=OFF -DWITH_CGAL_ImageIO=OFF . -- The C compiler identification ...
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