QGIS - Using Dutch AHN files and performing viewshed analysis

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i downloaded the new (dutch hight data) AHN files, and was trying to perform a viewshed analysis at some point near UTRECHT.

The plugin (gdal plugin) works ok, i tried it before with a dem map.

But when i use the AHN file it shows not the correct visibillity area.

so my question is

1. Does someone know how to setup the AHN files, for using in a viewshed analysis
2. Does someone know how to make the real heigt information visible on a map

Thank you!

BearHunt



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