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Convert GeoTiff to 3d WKT

  • 9 November 2018
  • 6 replies
  • 17 views
S

I am trying to convert some DEM in .tif image to polygon geometries representing 3 dimensional triangles that is Well-known text (WKT) - 3D (x, y, z) .

 

What is the work flow for doing this?

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Best answer by takashi 9 November 2018, 21:36

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takashi
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Userlevel 2
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You can use the TINGenerator to create triangles (3D polygons) from a single band numeric raster and use the GeometryExtractor to extract WKT representation as a feature attribute for each triangle.

  1. GeoTIFF reader
  2. TINGenerator (Input: Points/Lines, Output: Triangles)
  3. GeometryExtractor (Geometry Encoding: OGC Well Known Text)
S

You can use the TINGenerator to create triangles (3D polygons) from a single band numeric raster and use the GeometryExtractor to extract WKT representation as a feature attribute for each triangle.

  1. GeoTIFF reader
  2. TINGenerator (Input: Points/Lines, Output: Triangles)
  3. GeometryExtractor (Geometry Encoding: OGC Well Known Text)

@takashi, thank you for your support.

 

I appears am not getting is right as there is no output produced. See me screen below.... What am I missing?

takashi
Rank
Userlevel 2
Badge +17

You can use the TINGenerator to create triangles (3D polygons) from a single band numeric raster and use the GeometryExtractor to extract WKT representation as a feature attribute for each triangle.

  1. GeoTIFF reader
  2. TINGenerator (Input: Points/Lines, Output: Triangles)
  3. GeometryExtractor (Geometry Encoding: OGC Well Known Text)

The red cogwheel icon on a transformer GUI indicates that one or more required parameters are not set yet. Probably you didn't set the Surface Tolerance parameter. Try setting 0 or greater value to the parameter.

S

You can use the TINGenerator to create triangles (3D polygons) from a single band numeric raster and use the GeometryExtractor to extract WKT representation as a feature attribute for each triangle.

  1. GeoTIFF reader
  2. TINGenerator (Input: Points/Lines, Output: Triangles)
  3. GeometryExtractor (Geometry Encoding: OGC Well Known Text)

I am new to this technology unfortunately, I couldn't get this to work.

Permit me to ask for a detailed step-by-step guide on doing it? GeoTiff to 3D WKT

xiaomengatsafe
Rank
Badge +2

I am new to this technology unfortunately, I couldn't get this to work.

Permit me to ask for a detailed step-by-step guide on doing it? GeoTiff to 3D WKT

@shintaku Would you mind attache your workspace as it is now? That way the community experts can help you debug what's missing and how to get it to work. Thanks!

 

 

takashi
Rank
Userlevel 2
Badge +17

You can use the TINGenerator to create triangles (3D polygons) from a single band numeric raster and use the GeometryExtractor to extract WKT representation as a feature attribute for each triangle.

  1. GeoTIFF reader
  2. TINGenerator (Input: Points/Lines, Output: Triangles)
  3. GeometryExtractor (Geometry Encoding: OGC Well Known Text)

Possibly you've not made a connection between the attribute storing OGC WKT and the attribute "text_line_data" in the destination Text File writer feature type yet.

There are three ways to make the connection.

1. Just drag to draw a link between them.

2. Rename the geometry attribute to the same name as the destination attribute, in the GeometryExtractor parameters dialog.

3. Set the geometry attribute to the destination attribute in the writer feature type.

Hope this helps.

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