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PointCloudExpressionEvaluator producing string column

  • March 28, 2019
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txalaparta
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Hello

I am trying to create a point cloud with a string column. The value of the component depends on the value of another component. I am using PointCloudExpressionEvaluatot but this doesn´t allow string components.

I could use PointCloudComponentAdder to create string components but it doesn´t work because it creates constant strings which is not what I need.

For example:

If I have the following PointCloud:

x|y|gid|col0|col1

2653000|2565400|147729036548|0|255

2654000|2565400|147729036548|0|12

 

I´d like this output

x|y|gid|col0|col1

2653000|2565400|147729036548|0|

2654000|2565400|147729036548|0|12

Replacing 255 with empty string

 

I am using FeatureReader and String concatenator but it´s very slow for about 200millionpoints

 

Any help woud be appreciated

Thanks

Oskar

 

 

 

Best answer by daveatsafe

Hi @txalaparta,

Please read the source XYZ file with col1 defined as uint8, then use a PointCloudFilter to separate the 255 points into their own cloud. The filter only accepts numeric values. You can then use a PointCloudComponentRemover on that cloud to remove the col1 component.

Send the Unfiltered cloud to a PointCloudComponentCoercer to coerce col1 to String. Send both clouds to a PointCloudCombiner to join them again. Because the 255 cloud has no col1 component, those points will have the default for String added, which is blank.

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2 replies

daveatsafe
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  • daveatsafeSafer
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  • March 29, 2019

Hi @txalaparta,

Please read the source XYZ file with col1 defined as uint8, then use a PointCloudFilter to separate the 255 points into their own cloud. The filter only accepts numeric values. You can then use a PointCloudComponentRemover on that cloud to remove the col1 component.

Send the Unfiltered cloud to a PointCloudComponentCoercer to coerce col1 to String. Send both clouds to a PointCloudCombiner to join them again. Because the 255 cloud has no col1 component, those points will have the default for String added, which is blank.

txalaparta
Contributor
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  • txalapartaContributor
  • Author
  • Contributor
  • March 30, 2019

Hi @txalaparta,

Please read the source XYZ file with col1 defined as uint8, then use a PointCloudFilter to separate the 255 points into their own cloud. The filter only accepts numeric values. You can then use a PointCloudComponentRemover on that cloud to remove the col1 component.

Send the Unfiltered cloud to a PointCloudComponentCoercer to coerce col1 to String. Send both clouds to a PointCloudCombiner to join them again. Because the 255 cloud has no col1 component, those points will have the default for String added, which is blank.

Yes!!! This does exactly what I wanted

 

Thanks so much

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