Question

Best way to round/trim point geometry? CoordinateExtractor > AttributeRounder > GeometryReplacer?

  • 23 January 2017
  • 5 replies
  • 12 views

Badge +7

I know there's always about 10 different ways to do things in FME, so is there a better way than this to trim the geometry of a point?

CoordinateExtractor (to _x and _y attributes)

AttributeRounder (_x and _y to 3 decimal places using Nearest method)

GeometryReplacer (OGC Well Known Text Geometry Encoding, POINT (@Value(_x) @Value(_y)) Geometry Source)


5 replies

Userlevel 2
Badge +12

Have a look at the CoordinateRounder

No need to extract the coordinates first.

Userlevel 4

Agree with erik_jan about the CoordinateRounder. Alternatively, if you're going to write your data to an ESRI database (ArcSDE, File Geodatabase, etc), consider looking into the ArcSDEGridSnapper as well.

Extracting coordinates is guaranteed to slow down your workspace by quite a lot, so try to avoid it as much as possible.

Badge +7

Have a look at the CoordinateRounder

No need to extract the coordinates first.

Brilliant - thank you.

 

For info, I subsequently noticed the coordinates are in the data as attributes, already rounded. However a comparison of using GeometryReplacer with those existing attribute values vs CoordinateRounder shows that CoordinateRounder is about a minute faster for 320,000 records.

 

Badge +7

Agree with erik_jan about the CoordinateRounder. Alternatively, if you're going to write your data to an ESRI database (ArcSDE, File Geodatabase, etc), consider looking into the ArcSDEGridSnapper as well.

Extracting coordinates is guaranteed to slow down your workspace by quite a lot, so try to avoid it as much as possible.

Thanks - that's useful to know. We have had instances (before we had FME) where we'd run a Check/Repair Geometry in ArcGIS, load into ArcSDE, export, Check Geometry and find errors again. Even if we don't use the ArcSDEGridSnapper, that page is a useful resource on loading data into ArcSDE.

 

 

Userlevel 4
Thanks - that's useful to know. We have had instances (before we had FME) where we'd run a Check/Repair Geometry in ArcGIS, load into ArcSDE, export, Check Geometry and find errors again. Even if we don't use the ArcSDEGridSnapper, that page is a useful resource on loading data into ArcSDE.

 

 

Yes, that is exactly the use case for the ArcSDEGridSnapper, very handy when validating data on its way to an SDE storage.

 

 

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