[GRASSLIST:6030] Re: How deep is a region?

[Radim Blazek]

How was the region file created - what was the last module which 
modified the region?

Radim

David Adam wrote:
> Hamish wrote:
> 
>>> I'm trying to set up a region, starting with a Landsat TIFF
>>> image from California.  I have imported the region with r.in.gdal,
>>> which produces a large file. I then close grass60 and reopen in the
>>> new location, at which point I get the errors
>>>
>>>
>>> GRASS_INFO_ERROR(5579,1): default region is invalid
>>> GRASS_INFO_ERROR(5579,1): line 15: <depths:     -1074916636>
>>>
>>> The relevant file for the region is
>>>
>>> DEFAULT_WIND --
>>>
>>> proj:       99
>>> zone:       0
>>> north:      213720.89780907
>>> south:      -6149.10219093
>>> east:       -168613.96484194
>>> west:       -404623.96484194
>>> cols:       7867
>>> rows:       7329
>>> e-w resol:  30
>>> n-s resol:  30
>>> top:        1
>>> bottom:     0
>>> cols3:      7867
>>> rows3:      7329
>>> depths:     -1074916636
>>> e-w resol3: 30
>>> n-s resol3: 30
>>> t-b resol:  1
>>>
>>> --------------
>>>
>>> Most of the fields in the file are explained in the REGION section
>>> of the manual, but I can't seem to find anyplace that defines or
>>> explains what the "depths" field is about.  But until I can get
>>> grass to accept the region, I can't do much of anything.
>>>
>>> All help is much appreciated...
>>>   
>>
>>
>>
>> rows,cols, and res=30 all look right. I don't know what is causing the
>> depths to go nuts. Try editing the "WIND" file in your mapset to make
>> depths: 1?
>>
>>
>> maybe this works as a temporary workaround--
>>
>> try viewing the GeoTIFF meta-data with "gdalinfo".
>>
>> If the meta-data is bogus, wipe it clean with:
>>
>> tifftopnm map.tiff | pnmtotiff > map_clean.tiff
>>
>>
>> This will wipe all geo-coding, but you should be able to load into a X,Y
>> location ok and at least view the data. May rectify from there.
>>
>>
>>
>> Hamish
>>
>>
>>  
>>
> Thanks, I'll give that a try.
> In response to another reply, this is happening under Grass6.0.0beta2.
> 
> But one of my questions still stands: What does depth represent?  The 
> other terms in the
> DEFAULT_WIND file are defined in the g.region documentation, but not 
> depth.  If I knew
> what it stands for, perhaps I could guess the right value.
> 
> Thanks for the help!
> 
> david