gdal_grid - fails to find layer and field

Question

I'm using gdal_grid for the first time and get this issue:

gdal_grid -zfield field_3 -l layer0 OLEX-LAT-190952014.vrt OLEX-LAT-190952014.tiff
ERROR 1: Failed to find layer 'layer0' on datasource 'OLEX-LAT-190952014.short.csv'.
Failed to find field field_3 on layer layer0, skipping.

Here is what my vrt file looks like:

<OGRVRTDataSource>
<OGRVRTLayer name="layer0">
<SrcDataSource>OLEX-LAT-190952014.short.csv</SrcDataSource>
<GeometryType>wkbPoint</GeometryType>
<LayerSRS>EPSG:25832</LayerSRS>
<GeometryField separator=" " encoding="PointFromColumns" x="field_1" y="field_2" z="field_3"/>
</OGRVRTLayer>
</OGRVRTDataSource>

And my data file:

field_1,field_2,field_3
6932193.2570,377160.7010,-33.1300
6932194.6430,377162.4380,-32.6600

1. The first error mesage indicates that gdal_grid looks for a layer in the csv file - but how can a csv file contain a layer?
2. The next error message indicates that gdal_grid has read the csv file and can't find field_3 although it is clearly there?

Any ideas what I'm doing wrong?

GDAL version 1.10.1

Answer 1

Use ogrinfo as a handy debugging tool. I see:

$ ogrinfo OLEX-LAT-190952014.vrt
INFO: Open of `OLEX-LAT-190952014.vrt'
      using driver `VRT' successful.
1: layer0ERROR 1: Failed to find layer 'layer0' on datasource 'OLEX-LAT-190952014.short.csv'. (Point)

According to the documentation, SrcLayer is optional, but should be defined (unless in SrcSQL). Add this after SrcDataSource:

<SrcLayer>OLEX-LAT-190952014.short</SrcLayer>

Alternatively, use OLEX-LAT-190952014.short for the layer name (line 2) in place of layer0.