2023年4月2日 · In case anyone comes across this question and needs to convert to/from Esri (ArcGIS) json, geoJson, or WKT, I created a small application called geometry-inspector. It is much like the listed applications in the accepted answer, but with the improvement that it supports Esri's json format.

I'm trying to run the following test CSV through the Delimited Text plugin as WKT data: oid,Line 1 ...

In data formats like WKT and WKB, we have ways of representing "empty" geometries. That all pretty much makes sense: a "LINESTRING EMPTY" is a LINESTRING type with 0 vertices. Same with a MULTIPOINT, POLYGON, etc. But what about POINT EMPTY? For starters, there is no WKB representation for a POINT EMPTY, only WKT.

2019年9月25日 · With the following query it is possible to add a field with geometry in WKT format. SELECT *, geom_to_wkt(geometry) AS wkt FROM "districts" The output Virtual Layer will maintain original geometry and all initial attributes including a new, namely "wkt". The alternative query will contain ST_AsText() parameter.

Essentially you create a CSV file (although you should use a delimiter other than comma), where one column is the WKT representation of your geometry. Then when you select that file in the plugin, it picks up that there is a WKT column, and does the right thing. I can't vouch for its robustness, but the sample you gave works fine:

2014年3月18日 · One possible WKT validator can be PostGIS or a whatever spatial DBMS you like. For instance: SELECT ST_GeomFromText('POINT(-71.064544 42.28787)'); is executed successfully, because POINT(-71.064544 42.28787) is a valid WKT representation. Instead: SELECT ST_GeomFromText('POINT(-71.064544, 42.28787)'); returns:

2020年7月5日 · The first WKT standard from 1999 did not say anything about axis order, just that there are "x" and "y". It was later added, without making a new WKT version, "The interpretation of the coordinates is subject to the coordinate reference systems associated to the point".

2016年4月26日 · Note that the returned WKT string should be freed with OGRFree() or CPLFree() when no longer needed. It is the responsibility of the caller. This method is the same as the C function OSRExportToWkt().

2023年2月7日 · This is a great opportunity to try out some python. This script will convert your json columns into 2 new columns - 1 for the centroid wkt (the lat/lng part of the json) and 1 column for the poly wkt. It assumes your input csv has 2 columns [id,geom] - edit the csv or script to match your data.

I followed Greg Krakow's methodology to add a WKT field to my exported file (when exporting to csv, add GEOMETRY=AS_WKT in the "Layer" field, but the exported field delimiter is a comma: The problem is that each coordinate pairs of my polygons (and I suspect it will be the same for lines) are separated by a comma too so I can't import the data ...