[GRASS5] GRASS and ESRI: ASCII format

[Lisa Zygo]

Hi Markus,

Your second translation appears correct except for I think there in "south" under
the GRASS format.  It should be 5839993.75.  I am also unsure why you dropped the
number of cols & rows by 1.

Lisa

Markus Neteler wrote:

> Hi all,
>
> maybe a stupid question, but I don't fully understand how
> to interprete the ASCII GRID header of ESRI maps.
> I am currently writing a script to generate locations
> directly from GIS files.
>
> Example: I have a ESRI header looking like this:
>
> ncols         1121
> nrows         1121
> xllcorner     3442000
> yllcorner     5840000
> cellsize      12.5
> NODATA_value  -9999
>
> My script detects now:
> Checking file: v12_grid.asc
> Recognized format: ESRI
> north:      5854012.5000
> south:      5840000
> east:       3456012.5000
> west:       3442000
> cols:       1121
> rows:       1121
> N-S Resolution: 12.5
> W-E Resolution: 12.5
>
> I am quite sure that this is not what to be written to DEFAULT_WIND.
> My problem is to understand the "xllcorner/yllcorner" and the behaviour
> of GRASS to store in the middle of a cell, properly.
>
> If I change my script to produce:
> north:      5854006.2500
> south:      5829993.75
> east:       3456006.2500
> west:       3441993.75
> cols:       1120
> rows:       1120
> N-S Resolution: 12.5
> W-E Resolution: 12.5
>
> would I get the ESRI data into GRASS correctly referenced?
>
> Help/confirmation would be appreciated.
>
> Thanks!
>
>  Markus
>
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