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How can I convert EPSG4326 point to UTM in spatialite?

SRID=4326;POINT(51.2506238 35.70442974)

Executing X(TRANSFORM(Geometry, 32639)) as X always returns NULL. What's the proper way of extracting northing and easting from geometry type 4326?

enter image description here

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You've not given a reproducible example, but here's one:

spatialite> select X(transform(GeomFromText("POINT (0 0)",27700),4326));
X(transform(GeomFromText("POINT (0 0)",27700),4326))
-7.55715980520632

The X coordinate of (0,0) in epsg:27700 is -7.55 degrees in epsg:4326.

And here it is in spatialite-gui (version 2.0.0):

enter image description here

if this fails for you, then there's something wrong or just different with your Spatialite installation.

I'm not sure what your "SRID=..." line is suppose to be. Is that some text in a geometry column? I've constructed a geometry from a string in WKT format with the SRID passed to the GeomFromText function.

  • "SRID=..." is just represention of my geometry point type. I mean how can I extract easting and northing from existing field – Mani devs Sep 3 '18 at 18:58
  • Is it a valid representation of a point in Spatialite SQL? How are you converting this to a geometry type? – Spacedman Sep 3 '18 at 19:00
  • this is what spatialite-gui show about the geometry field SRID: 4326 Geometry type: POINT #1 POINT: 1) 51.2506 35.7044 – Mani devs Sep 3 '18 at 19:03
  • executing select X(transform(GeomFromText("POINT (0 0)",27700),4326)); in spatialite-gui 2.0.0-devel returns null also – Mani devs Sep 3 '18 at 19:07
  • @user30184 good point, but double quotes seems to work for me also. hmmm... – Spacedman Sep 3 '18 at 20:16

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