Populate Elevation Data in GPX using FME

Question

New to FME, and I have now spent more time than I would like to admit on this and need some pointers.
I have a GPX file that was made from a Shapefile. It has no elevation data.
I have the Terrain50 DEM as a GeoTIFF. I am using PointsOnRasterValueExtractor in FME to allocate the elevation data to the points before resaving the GPX. I have many thousands of these to do so I want to be able to batch process this.
I have checked that the two datasets are in the same projection, when I view the raster dataset in FME it has the data I need but I can't seem to populate the GPX Elev field. What am I doing wrong?

Fezter · Answer

How are you attempting to populate the Elev field? As per the documentation for the PointsOnRasterValueExtractor transformer,

The interpolated values are added to a new list attribute, named
_band{}.value and _band{}.palette{}.value, respectively.

You will need to use an AttributeManager transformer to assign these values to the Elev field. Because, the PointsOnRasterValueExtractor transformer creates list attributes, you'll need to select the position of the list of your _band{}.value. Assuming your DEM is a single band, the list index should be 0. Then, with a writer, write them to the GPX files.

Populate Elevation Data in GPX using FME

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