# \#libgeos

**URL:** https://discourse.julialang.org/tag/libgeos/1265.md

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## [Use Makie + LibGEOS](https://discourse.julialang.org/t/use-makie-libgeos/88420)

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**Author:** [@jw3126](https://discourse.julialang.org/u/jw3126)\
**Replies:** 3\
**Last updated:** [January 21, 2025, 2:51pm UTC](https://discourse.julialang.org/t/use-makie-libgeos/88420 "2025-01-21T14:51:14Z")

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There is GeoInterfaceRecipes which allows to use LibGEOS along with Plots.jl. Is there a similar package for combining LibGEOS with Makie?

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## [Sampling random points in LINESTRING geometry](https://discourse.julialang.org/t/sampling-random-points-in-linestring-geometry/121429)

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**Author:** [@miguelborrero](https://discourse.julialang.org/u/miguelborrero)\
**Replies:** 7\
**Last updated:** [October 18, 2024, 12:07am UTC](https://discourse.julialang.org/t/sampling-random-points-in-linestring-geometry/121429 "2024-10-18T00:07:33Z")

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Hi there, I a new user of the geo-tools in general, not only within the Julia ecosystem and I am trying to sample randomly from a LINESTRING LibGEOS geometry but the only function that seemed potentially useful is point…

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## [Create polygon in LibGEOS.jl](https://discourse.julialang.org/t/create-polygon-in-libgeos-jl/93483)

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**Author:** [@SDA](https://discourse.julialang.org/u/SDA)\
**Replies:** 4\
**Last updated:** [January 31, 2023, 7:35pm UTC](https://discourse.julialang.org/t/create-polygon-in-libgeos-jl/93483 "2023-01-31T19:35:39Z")

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I am trying to create a polygon using LibGEOS.jl. The docs give an example for the case where the polygon vertices are input manually: using LibGEOS p1 = readgeom(“POLYGON((0 0,1 0,1 1,0 0))”) I would like to instea…

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## [Count number of overlapping polygons with Julia?](https://discourse.julialang.org/t/count-number-of-overlapping-polygons-with-julia/57400)

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**Author:** [@vlandau](https://discourse.julialang.org/u/vlandau)\
**Replies:** 2\
**Last updated:** [July 19, 2022, 8:36pm UTC](https://discourse.julialang.org/t/count-number-of-overlapping-polygons-with-julia/57400 "2022-07-19T20:36:30Z")

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Hi all, I have a series of partially overlapping polygons in a single shapefile, and I need to create a new shapefile that has the number of overlapping polygons in each intersection. e.g. this. There is a way to do it …

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## [Computing Concave hull/alpha shape for a point cloud](https://discourse.julialang.org/t/computing-concave-hull-alpha-shape-for-a-point-cloud/82746)

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**Author:** [@arsh](https://discourse.julialang.org/u/arsh)\
**Replies:** 14\
**Last updated:** [June 16, 2022, 2:56pm UTC](https://discourse.julialang.org/t/computing-concave-hull-alpha-shape-for-a-point-cloud/82746 "2022-06-16T14:56:14Z")

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I have a point cloud and I want to find it’s outline(also includes holes). Eg: A delaunay triangulation of such point cloud might look like I have tried to use existing tools in the ecosystem but most of them don’t s…

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## [Improving performance on nested for loops (SparseArrays, LibGEOS)](https://discourse.julialang.org/t/improving-performance-on-nested-for-loops-sparsearrays-libgeos/74038)

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**Author:** [@nbalasus](https://discourse.julialang.org/u/nbalasus)\
**Replies:** 10\
**Last updated:** [January 7, 2022, 4:41am UTC](https://discourse.julialang.org/t/improving-performance-on-nested-for-loops-sparsearrays-libgeos/74038 "2022-01-07T04:41:15Z")

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I have two arrays of polygons, one with 9,000,000 polygons and the other with 60,000 polygons. I would like to find the intersecting area of each of these. In the MWE example below where I have reduced the example to 201…

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## [Point location library](https://discourse.julialang.org/t/point-location-library/55606)

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**Author:** [@Skoffer](https://discourse.julialang.org/u/Skoffer)\
**Replies:** 2\
**Last updated:** [December 3, 2021, 11:31am UTC](https://discourse.julialang.org/t/point-location-library/55606 "2021-12-03T11:31:28Z")

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Does anyone know, is there any Julia library for the Point Location problem? My search gave nothing, only this GEOS functions, but it looks like they are not exposed in LibGEOS.jl package. If there is no Julia package,…

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## [Find if point is within geojson polygons](https://discourse.julialang.org/t/find-if-point-is-within-geojson-polygons/70416)

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**Author:** [@alex-s-gardner](https://discourse.julialang.org/u/alex-s-gardner)\
**Replies:** 3\
**Last updated:** [October 26, 2021, 10:47pm UTC](https://discourse.julialang.org/t/find-if-point-is-within-geojson-polygons/70416 "2021-10-26T22:47:36Z")

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I am slowly dipping my toe into the Julia waters and I’m hoping someone could point me in the right direction as to how I can determine if a point falls within any of the polygons defined by a geojson file. I’ve found Ge…

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## [Compute surfaces of intersection between circles in julia with LibGEOS](https://discourse.julialang.org/t/compute-surfaces-of-intersection-between-circles-in-julia-with-libgeos/59811)

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**Author:** [@Meije\_Gawinowski](https://discourse.julialang.org/u/Meije_Gawinowski)\
**Replies:** 4\
**Last updated:** [April 24, 2021, 12:55pm UTC](https://discourse.julialang.org/t/compute-surfaces-of-intersection-between-circles-in-julia-with-libgeos/59811 "2021-04-24T12:55:11Z")

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I need to compute surfaces of intersection between different circles. I am used to do it in R with the sf library and it works fine but I need to do it in Julia with the LibGEOS library and it is not as easy… My first q…