WKT (Well-Known Text)
Open BetaWKT قالبی برای نمایش متنی هندسههاست که در پایگاههای داده (PostGIS، SpatiaLite) و برنامههای GIS استفاده میشود. ساده و آسان برای یکپارچهسازی.
ویژگیهای کلیدی
دربارهٔ قالب 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.
چه برنامهای فایلهای WKT را باز میکند
برنامهها و نرمافزارهای زیر میتوانند فایلهای WKT (Well-Known Text) (.wkt) صادرشده از OSM2CDR را باز و ویرایش کنند و با آنها کار کنند:
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.
چه کسانی از نقشههای WKT استفاده میکنند
چگونه WKT را خروجی بگیریم
نحوه باز کردن پس از خروجی
- 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.
نقشههای محبوب در WKT
خروجی نقشهٔ WKT (Well-Known Text) را دریافت کنید
نقشههای حرفهای WKT را از OpenStreetMap دانلود کنید. تولید آنی برای هر ناحیه.
پرسشهای متداول
مقایسه با قالبهای دیگر
Convert to WKT and back
قالبهای مرتبط
قالبهایی که اغلب همراه با هم خروجی گرفته میشوند
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