RasterDEMGenerator not carrying feature attributes through to output

@rclarkenz

for some reason the pictures in your post are not visible.

When reading a LAS file, the reader allows you to set the FeatureTypeName either from File Name(s): Generates one feature type per source filename or from Format Name: Produces only a single feature type containing the format name.

Check if you have set this to format name?

LAS Reader Parameters

hope that helps

happy fme-ing :-)

srg

@rclarkenz

Use the Group By in the RasterDEMGenerator and set it to basename (or featuretypename.)

Use same GroupBy in the fanout of the DEM writer.

These attributes are often replaced by the transformer name ( dem generated could be from a single featuretype, more or none. )

Thanks for this.

Not sure why pics don't showed up. They are showing on my screen. Weird.

happy fme-ing to you too :o)

This has worked :o)

I guess I had seen fme_basename retain the filename in the past so was expecting it to do so here too.

I've learnt something new now so thank you.

Hi @rclarkenz,

The output of the vector to raster transformers is extremely different from the input, with attributes only on the overall raster rather than the individual pixels, so we felt it was most accurate to discard any attributes that did not apply to the entire raster (ie. those chosen in the Group By).

The fme_basename attribute is a format attribute, and is often used to fan out the output data, so instead of being discarded, it is given the transformer name to signal that a vector to raster conversion has been applied to the data.

This is the reasoning behind the present behavior, but we are always happy to hear of ways that can be changed to improve our user's experience with FME.