[GRASSLIST:2567] Re: Moire effect in aspect map

[Christof Bigler]

Sorry for bothering you again...

gdalinfo gives the same info for projection, zone, datum, and ellipsoid 
as my default settings.

Last part of the output of gdalinfo:
> Origin = (131904.828978,4561132.087882)
> Pixel Size = (27.27543571,-27.27543571)
> Corner Coordinates:
> Upper Left  (  131904.829, 4561132.088)
> Lower Left  (  131904.829, 4317044.214)
> Upper Right (  416060.318, 4561132.088)
> Lower Right (  416060.318, 4317044.214)
> Center      (  273982.574, 4439088.151)
> Band 1 Block=256x4 Type=Float32, ColorInterp=Undefined
> Min=1280.949 Max=4412.362
> NoData Value=-3.40282e+38

This is consistent with the output of r.info when I import the DEM with 
the -o flag, i.e. when I override the projection to get quadratic grid 
cells:
> Type of Map:  raster
> Number of Categories: 4412
> Data Type:    FCELL
> Rows:         8948
> Columns:      10417
> Total Cells:  93211316
> Projection: UTM (zone 13)
>          N: 4561145.72559973    S: 4317085.1268369   Res: 27.27543571
>          E: 416019.40508569    W: 131891.19125998   Res: 27.27543571
> Range of data:    min =  0.000000 max = 4412.000000

The only thing that is different in gdalinfo is:
> Size is 10418, 8949
and the Min/Max values.

When importing the DEM, there is no error message such as 'Projection 
of dataset does not appear to match current location'.

Even when I create a new location with
> r.in.gdal in=codem1nw out=codem1nw3.r location=newlocation3
I can still see the moire effect on the aspect map. Looks like an 
artifact to me.

Christof

On 10.02.2004, at 20:21, Hamish wrote:

> well, the problem seems to be the data doesn't match the region info,
> regardless of what "prj.adf" says.
>
> Maybe 'gdalinfo' will give you a better idea of what the data details
> are. It must be stored as rows and columns in the input file, all you
> have to do is match that..
>
> also, try 'r.in.gdal -e' and see if that does it.
>
>
>
> Hamish
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