[gdal-dev] beginners programming questions

[WolfgangZ]

Hi,

I'm quite new to programming with gdal/python and I want to know if my 
ideas are easily doable or if I should better use a GIS system like 
Grass for that tasks.

1. accessing the cell value of a (float) tiff. I know how to load the 
map into an array, but this seems to be overkill.

2. can I get the surrounding cells or better directly (bilinear/cubic) 
interpolated data? I want to extract the elevation for GPS points, but 
only the cell value looks not so nice in 3D model as there also 
interpolation between the heights is done.

3. can I extract height profiles along a line between two points?

4. can I change the resolution of the input map directly in python (as 
replacement of gdal_translate -tr)?

Many thanks
Wolfgang