WKT (Well-Known Text) is een tekstuele weergave van geometrische objecten volgens de OGC-standaard.

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WKT (Well-Known Text)

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.wkt · text/plain

WKT is een tekstuele representatie voor geometrieën, gebruikt in databases (PostGIS, SpatiaLite) en GIS-toepassingen. Eenvoudig en gemakkelijk te integreren.

WKT nu exporteren ✨ Open bèta — gratis, zonder limieten

Belangrijkste functies

✓Tekstformaat

✓OGC-standaard

✓Eenvoudige integratie met database

✓Alle geometrietypen ondersteund

Over het WKT-formaat

WKT (Well-Known Text) is the textual encoding of geometry from the OGC standard: POINT(37.6177 55.7558), LINESTRING(...), POLYGON((...)). It is understood by every spatial database and library — PostGIS, SpatiaLite, Shapely, JTS, GEOS — and it can be read by eye, which makes the format indispensable while debugging.

The export is taken when geometry is needed as text: to paste into an SQL query, to put into a test, to pass coordinates to someone else's system, to take a quick look at what came out of the selected area at all.

The output is a single text file in UTF-8. At the top are comments with the bounding box of the area and the coordinate system, then it goes layer by layer: a line like "-- layer: roads" with one geometry per line underneath it. Coordinates are in WGS84 (EPSG:4326) with six decimal places — that is about ten centimeters on the ground.

One important thing: WKT stores shapes only. There are no names, types or other OpenStreetMap tags in the file — if you need attributes, take GeoJSON, GeoPackage or a CSV with a WKT column.

Welk programma opent WKT-bestanden

De volgende programma's en toepassingen kunnen WKT (Well-Known Text)-bestanden (.wkt) die uit OSM2CDR zijn geëxporteerd openen, bewerken en verwerken:

💻PostGIS 💻SpatiaLite 🌎QGIS 💻Shapely (Python) 💻JTS (Java) 💻GEOS

Format specifications

Open standard
3D coordinates supported
Lossless (no quality loss)
No attributes
Output: 1 file
Well-Known Text (OGC Simple Features). One geometry per line, human-readable. Direct INSERT into PostGIS / Spatialite.

Wie gebruikt WKT-kaarten

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Databases (PostGIS)

Geometry is pasted into SQL directly through ST_GeomFromText — with no converters and no intermediate files.

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Programmeren

Convenient material for tests and debugging: the shape is visible to the eye right in the source.

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GIS-analyse

Quick exchange of geometry between GIS tools, all of which understand WKT.

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Systeemintegratie

Passing coordinates to an adjacent system that accepts plain text rather than GIS format files.

WKT exporteren

Gebied selecteren

Teken een rechthoek of polygoon op de interactieve kaart op osm2cdr.ru

WKT kiezen

Selecteer WKT (Well-Known Text) uit de lijst van 127 beschikbare exportformaten

Exporteren

Klik op Exporteren en ontvang uw .wkt-bestand binnen 1-5 minuten

Downloaden

Download het gerede WKT-bestand en open het in PostGIS

Openen na de export

PostGIS — paste the lines as they are: INSERT ... VALUES (ST_GeomFromText('POLYGON((...))', 4326)); the SRID must be specified.
Python — from shapely import wkt, then wkt.loads(line) line by line, skipping the lines that begin with two hyphens.
QGIS — the QuickWKT plugin pastes geometry from the clipboard onto a temporary layer; for a full-fledged layer it is easier to download GeoJSON right away.
Tables — WKT is understood by CSV import in QGIS: "Add Delimited Text Layer", with geometry from the WKT field.
Checking — ST_IsValid in PostGIS or shapely.is_valid: self-intersections after simplification do happen, and it is better to learn about them before loading into a database.