[Qlandkartegt-users] elevation data

[Andrew W. <and...@ma...>]

Hi all,

I have just discovered QLandKarte GT and am very pleased I've found it.
I previously used Windows only software via wine on Ubuntu. I am so glad
to find a native linux open source alternative.

I have figured out how to convert and calibrate my UK OSGB (Magellan:
GRB36) digital map collection, but I have a problem importing the
elevation data.

What is the correct format and procedure for adding elevation data?

This is what I have done:
-convert a Tiff into a GeoTiff by geo referencing it
-create a map collection from the geo-referenced file above
-right click on the map collection (qmap)and click 'Add DEM...'

I am using Global Mapper 11 to convert my elevation data from .qed into
a GeoTiff, 16 bits per channel,1 layer grey scale.

In QLandKart GT the elevation data is displayed correctly on the 2D map.
The shading and contour display as expected on the 2D map, but the 3D
map appears to remain flat?  Am I using the correct GeoTiff format for
the DEM?

Thanks in advance,
Andy


PS. If anyone is interested, here is the 'Projection' setting I used
when geo-referencing my UK OSGB map scans.

+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000
+ellps=airy +datum=OSGB36 +units=m +no_defs
 
Worked fine for me if I used BNG grid references for the coords but
first converting the letters into metres.

eg: BNG SS 52000 56970   ==  easting 256970  northing 152000