locationtech/jts

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The JTS Topology Suite is a Java library for creating and manipulating vector geometry.

Stars: 2.2k
Forks: 475
Open beginner issues: 0
Indexed issues: 173
Avg merge: 14d 10h
Merged PRs (30d): 1

Dominant language: Java
License: No license data
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

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173 open issues indexed

GeometrySnapper.snapToSelf can produce an incorrect polygonal result when multiple target vertices are within the snap tolerance Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

locationtech/jts#1231 · Opened Sep 7, 2026
[Query / Chore] Clarify the ConstrainedDelaunayTriangulator docs Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

locationtech/jts#1227 · Opened Aug 27, 2026
WKTWriter emits invalid dimensional EMPTY tokens for nested empty geometries Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

locationtech/jts#1223 · Opened Aug 12, 2026
OverlayNG difference operation moves points in outer edge Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

locationtech/jts#1222 · 5 comments · Opened Aug 11, 2026
Respect Thread interruption in potentially long-running loops. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

locationtech/jts#1209 · Opened Jun 18, 2026
EPIC: SQL/MM Spatial (ISO/IEC 13249-3) Curve Awareness in JTS Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

locationtech/jts#1195 · 25 comments · Opened May 10, 2026
Android dex2oatd error Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

locationtech/jts#1192 · Opened Apr 17, 2026
ConformingDelaunayTriangulationBuilder poor triangulation for single-triangle input, possibly for any already-Delaunay set of constraints. Open

jts-core type-question

Difficulty 4/5 3-5 days Newbie friendliness 45/100

locationtech/jts#1190 · 13 comments · Opened Apr 13, 2026
Negative buffer removes most of input geometry Open

jts-core type-bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

locationtech/jts#1183 · 4 comments · 1 reaction · Opened Feb 18, 2026
LocationIndexedLine extractLine() producing unusual results Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

locationtech/jts#1181 · Opened Feb 13, 2026
Buffer on simple Polygon producing invalid MultiPolygon Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#1180 · Opened Feb 13, 2026
Quadtree query performance in multi-threaded environments due to synchronized items list Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

locationtech/jts#1169 · 1 comment · Opened Dec 17, 2025
ConcaveHull.concaveHullByLength can lead to infinite loops Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

locationtech/jts#1153 · 2 comments · 1 reaction · Opened Sep 22, 2025
The geometry's SRID unexpectedly resets to 0 (EPSG:0) after spatial operations like buffer. Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

locationtech/jts#1152 · 1 comment · Opened Sep 20, 2025
MinumumAreaRectangle with convex hint is limited because all methods are private Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

locationtech/jts#1149 · 1 comment · Opened Sep 16, 2025
Unexpected output from OffsetCurve.getCurve() since jts-version 1.20.0 Open

type-question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#1147 · 2 comments · Opened Sep 3, 2025
Specific Small buffer of a polygon returns an empty geometry Open

type-bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#1143 · 1 comment · Opened Aug 25, 2025
Summary of Issues for Delaunay Triangulation Open

jts-core type-bug

Difficulty 5/5 Over a week Newbie friendliness 20/100

locationtech/jts#1138 · Opened Jul 16, 2025
snapRoundingNoder on polygons result in MultiLineString Open

type-question

Difficulty 4/5 3-5 days Newbie friendliness 30/100

locationtech/jts#1133 · 1 comment · Opened May 27, 2025
DouglasPeuckerLineSimplifier.simplifySection() recursive calls cause StackOverflowError Open

jts-core type-bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

locationtech/jts#1127 · 3 comments · Opened May 1, 2025
CoverageValidator does not detect gap if tolerance is too large Open

jts-core type-bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

locationtech/jts#1122 · Opened Mar 3, 2025
Add Collection Type Parameter Declarations for method return values? Open

type-question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

locationtech/jts#1113 · 7 comments · 1 reaction · Opened Jan 26, 2025
Summary: Point-Line Orientation robustness issues Open

type-bug

Difficulty 5/5 Over a week Newbie friendliness 20/100

locationtech/jts#1106 · Opened Jan 3, 2025
Summary: Buffer issues Open

type-bug

Difficulty 5/5 Over a week Newbie friendliness 15/100

locationtech/jts#1102 · Opened Dec 19, 2024
Add CODE_OF_CONDUCT, SECURITY, NOTICE Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

locationtech/jts#1077 · Opened Sep 6, 2024
Integrate the use of the Eclipse Dash License Tool Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

locationtech/jts#1076 · Opened Sep 6, 2024
Unexpected output from FontGlyphReader for truetype fonts Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

locationtech/jts#1075 · 2 comments · Opened Sep 4, 2024
Polygonizer.getGeometry() results are non-deterministic when extractOnlyPolygonal=true Open

type-bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#1063 · 5 comments · Opened Jul 10, 2024
GeoJsonReader does not have support for reading geojson with measures Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

locationtech/jts#1047 · Opened Apr 10, 2024
Incorrect Voronoi diagram generated for 4 points Open

type-bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

locationtech/jts#1039 · 2 comments · Opened Mar 14, 2024
Expose GeometryOverlay `isOverlayNG` flag Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

locationtech/jts#1034 · Opened Jan 27, 2024
Buffer with Flat endcap produces artifacts Open

type-bug

Difficulty 5/5 Over a week Newbie friendliness 25/100

locationtech/jts#1028 · Opened Jan 5, 2024
Trying to use GeoServer and it seems the error comes back to Coordinate.setM Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

locationtech/jts#1026 · 2 comments · Opened Dec 6, 2023
parseKMLCoordinatesAndAttributes can fail Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#1018 · Opened Nov 17, 2023
NullPointerException thrown by SimpleNoder when geometry covers but does not overlap Open

jts-core

Difficulty 3/5 1-2 days Newbie friendliness 48/100

locationtech/jts#1009 · 1 comment · Opened Oct 19, 2023
Negative buffer operation leaves some collinear points (regression from 1.19.0) Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

locationtech/jts#1007 · Opened Oct 13, 2023
Summary: OverlayNG failures Open

jts-core-overlay type-bug

Difficulty 5/5 Over a week Newbie friendliness 18/100

locationtech/jts#1000 · 1 comment · Opened Aug 21, 2023
Geometry.buffer with fixed precision removes hole Open

type-bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#979 · 1 comment · Opened May 24, 2023
Polygonizer extractOnlyPolygonal documentation Open

doc type-improvement

Difficulty 3/5 1-2 days Newbie friendliness 52/100

locationtech/jts#969 · Opened Mar 15, 2023
Add option to start building another STRTree from other STRTree Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

locationtech/jts#967 · 1 comment · Opened Mar 10, 2023
Add method access Quadtree internals Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

locationtech/jts#966 · Opened Mar 10, 2023
Weird GeometryFixer behavior Open

type-question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#959 · 3 comments · Opened Feb 25, 2023
`ConcaveHullOfPolygons` can produce disconnected result Open

type-bug

locationtech/jts#948 · 1 assignee · Opened Jan 6, 2023
WKTReader silently adds dimensions when setIsOldJtsCoordinateSyntaxAllowed is true Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#939 · Opened Dec 8, 2022
Misleading documentation for LocationIndexedLine Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

locationtech/jts#937 · Opened Nov 23, 2022
Add reading Feature properties to GeoJsonReader Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

locationtech/jts#933 · 10 reactions · Opened Nov 18, 2022
Musing about non-functional code cleanup Open

type-proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

locationtech/jts#918 · 2 comments · 1 reaction · Opened Oct 15, 2022
Small buffer of a polygon returns an empty geometry Open

type-bug

Difficulty 4/5 3-5 days Newbie friendliness 40/100

locationtech/jts#908 · 4 comments · Opened Sep 23, 2022
MinimumDiameter.minimumRectangle result is incorrect Open

jts-core type-bug

locationtech/jts#907 · 1 assignee · Opened Sep 15, 2022
nearestNeighbourAsStream Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

locationtech/jts#903 · Opened Aug 28, 2022

locationtech/jts

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