no-data when reprojecting ETRS89 / UTM zone 32N to WGS84!

[PeterFogh]

Hi, I'm working on the public available Danish Elevation Model here https://github.com/PeterFogh/digital_elevation_model_use_cases.
However, when I try to reproject the GeoTIFF file in ETRS89 / UTM zone 32N to WGS84 the resulting dataset is filled with no-data values. Does anybody know why this is happening for my dataset?

I have tried executing with documentation data (see docs) with my package version without any problems.

Here is one of my GeoTIFF files from the Danish Elevation Model which fails.
DTM_1km_6280_540.zip

OS version: Ubuntu 20.04.3 LTS
package versions:

rioxarray.__version__='0.8.0'
xr.__version__='0.19.0'
rasterio.__version__='1.2.10'

My code and package version are:

import rioxarray
import xarray as xr
import rasterio
print(f'{rioxarray.__version__=}')
print(f'{xr.__version__=}')
print(f'{rasterio.__version__=}')

da = rioxarray.open_rasterio('../DEMs/denmark/data/DTM_1km_6285_540.tif')
da.rio.reproject('epsg:4258').plot()

Which results in this visualization

[snowman2]

What happens if you mask the nodata:

da = rioxarray.open_rasterio('../DEMs/denmark/data/DTM_1km_6285_540.tif')
dar = da.rio.reproject('epsg:4258')
dar.where(dar!=dar.rio.nodata).plot()

[PeterFogh]

Hi @snowman2, thank you so much :) it solved the problem.

Thus the problem was, that the plotting could not visualise the actual data when the nodata value is so large (-9999) (e.g. the range of values was too big to show the range of the actual data)