Question

Vector-Raster-conversion

  • 27 June 2016
  • 8 replies
  • 108 views
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I want to convert a polygon shape file into a raster tif. The integer values of an attribute of the polygon shape should become the cell values of the output raster. I tried the NumericRasterizer, but this transformer creates multiple tif files for each unique cell value. Is a an alternative transformer to do this quiet simple task or another transformer to combine the multiple raster files into one output raster?

8 replies

david_r
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Userlevel 4

Have a look at the MapnikRasterizer.

takashi
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Userlevel 2
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Hi @andreas_lgrb, maybe this workflow does the trick.

  1. 3DForer: Set the attribute value to z coordinate of the polygons.
  2. PointCloudCombiner: Transform the polygons into a point cloud.
  3. NumericRasterizer: Transform the point cloud into a raster.
A
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Hi @andreas_lgrb, maybe this workflow does the trick.

  1. 3DForer: Set the attribute value to z coordinate of the polygons.
  2. PointCloudCombiner: Transform the polygons into a point cloud.
  3. NumericRasterizer: Transform the point cloud into a raster.

Hi takashi,

nice idea, but the number of input polygons is too large to create a point cloud. Performance is very low.

thanks anyway.

takashi
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Userlevel 2
Badge +17

Hi takashi,

nice idea, but the number of input polygons is too large to create a point cloud. Performance is very low.

thanks anyway.

@andreas_lgrb, the performance might be improved if you would create a single multi-area feature from all the polygons beforehand.

M
Badge +5
this transformer creates multiple tif files for each unique cell value

I'm not seeing that. Can you clarify? The only reason this would create multiple outputs is if you had a group-by set. If you turn off the group-by parameter then you wouldn't get multiple outputs. Does that help?

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this transformer creates multiple tif files for each unique cell value

I'm not seeing that. Can you clarify? The only reason this would create multiple outputs is if you had a group-by set. If you turn off the group-by parameter then you wouldn't get multiple outputs. Does that help?

without group-by parameter specified, I don't receive the right cell value from the polygon attribute which represents ma classification value.

The problem could be solved using the arcGIS toolbox->conversion tools->to raster->polygon to raster. There I can choose a value field in the polygon shape which is converted to the cell value in the raster file.

M
Badge +5

without group-by parameter specified, I don't receive the right cell value from the polygon attribute which represents ma classification value.

The problem could be solved using the arcGIS toolbox->conversion tools->to raster->polygon to raster. There I can choose a value field in the polygon shape which is converted to the cell value in the raster file.

Do you use a 3DForcer transformer set to that attribute? The NumericRasterizer defaults to the Z value of a feature, so setting the Z value to the attribute will force the NumericRasterizer to use that value.

A
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Problem solved:

1. Setting the attribute value of the polygon shape to a Z value (AttributeCreator)

2. then using this Z value within a 3DForcer

3. and finally using the NumericRasterizer (without Group by) a raster is created with the correct pixel values.

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