[GRASS-windows] Georectify problems

[Ken Mycock]

Thanks again Moritz

I ran it from the command line without the -c flag, so g.region worked 
as per your last para.  If I use the georectify GUI (6.3) in future, do 
I need to run g.region vect=MylargestMap first to work round the -c flag?

Regards
Ken

On 05/12/2008 12:30, Moritz Lennert wrote:
> On 05/12/08 11:36, Ken Mycock wrote:
>> Moritz & List members
>>
>> I've now cracked the bad format issue - accidentally double clicking 
>> a point on the target map to give the east-north reference puts two 
>> sets of coordinates into the point file. That is one line ends up 
>> with one xy point followed by two east-north points, hence the bad 
>> format.  I'll log a bug report on this relatively small aspect.
>>
>> Correcting this allows i.rectify to run to completion.  For my test 
>> image, it reported over 3.5 million cells created for each of the 
>> three colour channels, which is as expected.  However, displaying the 
>> resulting georectified raster in the target mapset shows large single 
>> colour blocks arranged in the expected portion of the target region - 
>> north 5 blocks cover over 1 km and east 8 blocks cover about the same 
>> distance, so the region is covered by 40 cells, not the reported 3.5 
>> million.
>>
>> Any suggestions what I'm doing wrong this time?
>
> You need to set the desired resolution and extent in the target 
> location (g.region).
>
> Did you run i.rectify from the command line or via the georectify GUI 
> ? If the latter than until (including) 6.3, this ran i.rectify with 
> the -c flag, meaning that it only rectified the portion of the map 
> that lies within the current region of the target location. Since 6.4, 
> there is a flag allowing you to chose whether you want this.
>
> If you ran from the command line and didn't use the -c flag, then just 
> try running g.region rast=YourMap and redisplay ("Zoom to 
> computational region").
>
> Moritz
>