WKT (Well-Known Text) on geometristen kohteiden tekstiesitys OGC-standardin mukaisesti.

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WKT (Well-Known Text)

Open Beta

.wkt · text/plain

WKT on geometrioiden tekstiesitysmuoto, jota käytetään tietokannoissa (PostGIS, SpatiaLite) ja GIS-sovelluksissa. Yksinkertainen ja helppo integroida.

Vie WKT nyt ✨ Avoin beta — ilmainen, ei rajoituksia

Keskeiset ominaisuudet

✓Tekstimuoto

✓OGC-standardi

✓Helppo tietokantaintegraatio

✓Kaikki geometriatyypit tuettu

Tietoa WKT-muodosta

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.

Mikä ohjelma avaa WKT-tiedostot

Seuraavat ohjelmat ja sovellukset voivat avata ja muokata OSM2CDR:stä vietyjä WKT (Well-Known Text) (.wkt) -tiedostoja sekä työskennellä niiden parissa:

💻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.

Ketkä käyttävät WKT-karttoja

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Tietokannat (PostGIS)

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

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Ohjelmointi

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

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GIS-analyysi

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

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Järjestelmäintegraatio

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

Näin viet kartan muotoon WKT

Valitse alue

Piirrä suorakulmio tai monikulmio interaktiiviselle kartalle osoitteessa osm2cdr.ru

Valitse WKT

Valitse WKT (Well-Known Text) 127 saatavilla olevan vientimuodon luettelosta

Vie

Napsauta Vie ja saat .wkt-tiedostosi 1–5 minuutissa

Lataa

Lataa valmis WKT-tiedosto ja avaa se ohjelmassa PostGIS

Kuinka avata viennin jälkeen

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.