WKT (Well-Known Text) е текстово представяне на геометрични обекти според стандарта на OGC.

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WKT (Well-Known Text)

Open Beta

.wkt · text/plain

WKT е текстов формат за представяне на геометрии, използван в бази данни (PostGIS, SpatiaLite) и ГИС приложения. Прост и лесен за интегриране.

Експортирайте WKT сега ✨ Отворена бета версия — безплатно, без ограничения

Основни характеристики

✓Текстов формат

✓Стандарт на OGC

✓Лесна интеграция с база данни

✓Поддръжка на всички типове геометрия

За формата WKT

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.

Коя програма отваря файлове WKT

Следните програми и приложения могат да отварят, редактират и работят с файлове WKT (Well-Known Text) (.wkt), експортирани от OSM2CDR:

💻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.

Кой използва карти в WKT

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Бази данни (PostGIS)

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

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Програмиране

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

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ГИС анализ

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

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Системна интеграция

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

Как да експортирате WKT

Изберете област

Начертайте правоъгълник или полигон на интерактивната карта на osm2cdr.ru

Изберете WKT

Изберете WKT (Well-Known Text) от списъка с 127 налични формата за експорт

Експорт

Щракнете върху „Експорт“ и получете файла си .wkt за 1-5 минути

Изтегляне

Изтеглете готовия файл WKT и го отворете в PostGIS

Как да отворите след експорта

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.