[Gdal-dev] gdal_warp question

[Christopher Condit]

Hi list-
I'm attempting to use gdal_warp to interpolate and resample an ArcInfo
ASCII Grid.  I'm getting strange negative values in the output and I'm
curious as to why that is.

gdal_translate.exe somedodssource[y][x] -a_srs EPSG:4326 -a_nodata -1
-of AAIGrid out.txt
gdalwarp -ot Float32 -wt Float32 -te -179.5 -89.5 179.5 89.5 -tr 1 1
-srcnodata -1 -of GTiff out.txt test.tif

I'm trying to regrid this data to 1 degree cells centered on the half
degree.  I do get output - but the range is way off. There are many
negative values in the output. The range of values in my input ascii
file is 0.0 to 2736477.5.  They are floats.

What's going on?

Thanks!

Chris