[GIS] add wkt representation of the geometry as field in qgis

qgisshapefilewell-known-text

I have the shapefile of boundaries loaded in qgis. I want to add a field in the file which is WKT representation of the feature.

Update

As Nathan W answered
I used geomToWKT( $geometry ) and got result. The thing is the coordinates are in lon lat format. I found out that that i need them in lat lon format. Is it possible to change the order of coordinates?

Best Answer

In QGIS 2.0 you can use the following function in the field calculator.

 geomToWKT( $geometry )

Related Solutions

[GIS] Converting geometry to WKT using ArcPy

A da.searchcursor should work for you.

for row in arcpy.da.SearchCursor("path2data", ["SHAPE@WKT"]):
  print row[0]

POINT Z (-119.53753379999995 49.854383300000052 303.14500000000407)

doc here: http://resources.arcgis.com/en/help/main/10.1/index.html#//002z0000001t000000

Note: SHAPE@JSON, SHAPE@WKB, and SHAPE@WKT tokens were made available at ArcGIS 10.1 Service Pack 1.

Or, if you're after the samples toolbox like you mentioned - its there, just deprecated. You can call into it with scripts still. If you need the actual toolbox you can use, its here on the old Model and Script Gallery

EDIT (extra example)...Because you asked so nicely: :)

for row in arcpy.da.SearchCursor("GPX_Layer", ["SHAPE@WKT"],where_clause="TYPE = 'a'"):
    print row[0]

It's just the same as a "select by attributes" type of query/expression. I have a field called "TYPE" and and a value 'a'.

[GIS] How to create WKT file readable by QGIS 2.4.0

Yes, you just need to add a header line to tell the imported the name of your geometry column, otherwise I guess it doesn't work, for instance:

Geom,
"POLYGON((-125 52, -125 21, -98 21, -98 52, -125 52),(-120 50, -120 35, -100 35, -100 50, -120 50))"

I would also put quotation marks around the text as I have done. The importer should recognise that this is WKT and work accordingly. If you need to add more records you will need to think about how they are delimited etc, but qgis provides a number of options to parse delimited text so this shouldn't be an issue.

Best Answer

Related Solutions

[GIS] Converting geometry to WKT using ArcPy

[GIS] How to create WKT file readable by QGIS 2.4.0

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