[Gdal-dev] pixel spacing of gdal2xyz.py

[Xiaodong Zhang]

Dear list members,

I need your help!

I'm using gdal2xyz.py to extract data from Landsat images into an ASCII 
file in a format of x, y, data1, data2, ...
The requirement is to output longitude (as x) and latitude (as y) and 
the original image is in non-geographic projection (e.g., Lambert, UTM, 
etc). What I did was to
1) use gdal utility to convert the image into geographic project (lat 
and lon)
2) run gdal2xyz.py to extract the data.

The problem I'm having is that the pixel spacing is not 30 m by 30 m (x 
spacing shorter than and y spacing larger than 30 m). The original image 
pixel size is 30x30 and the grid data extracted using ArcGIS is also 
30x30. My questions are 1) what could be wrong; and 2) are there other 
better ways of doing this

Thanks
Xiaodong

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Xiaodong Zhang
Department of Earth System Science & Policy
Clifford Hall, Box 9011
University of North Dakota
Grand Forks, ND 58202-9011
Tel. (701)777-6087 | Fax. (701)777-2940
E-mail: zhang at aero.und.edu
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