[GRASS-user] i.rectify - how long is too long

[Moritz Lennert]

On 19/01/08 00:25, Luis E Menoyo wrote:
> 
> I'm using 1st order and 13 GCPs on an image and i.rectify has been 
> running over 3 hours.  Is the process locking up or is this amount of 
> time normal in image rectification?  Is i.rectify processing just the 
> area of the image to be rectified, of is it calculating for the whole 
> target mapset area?  In other words, should I have applied a mask to the 
> target mapset before running the georectify tool in order to cut down on 
> processing time?

What are your region settings in the target location, especially the 
resolution ? This can make an enormous difference in terms of 
calculation time.


Moritz

> 
> Any info would be greatly appreciated.
> Thanks!
> 
> Image info:
> 
>  +----------------------------------------------------------------------------+ 
> 
>  | Layer:    D-10 at PERMANENT                 Date: Fri Jan 18 08:17:14 
> 2008    |
>  | Mapset:   PERMANENT                      Login of Creator: me        |
>  | Location: x-y                                                         
>      |
>  | DataBase: /gis/oahu_flightlines                     |
>  | Title:     ( D-10 )                                                   
>      |
>  | Timestamp: none                                                       
>      |
>  |----------------------------------------------------------------------------| 
> 
>  |                                                                       
>      |
>  |   Type of Map:  raster               Number of Categories: 255       
>       |
>  |   Data Type:    CELL                                                 
>       |
>  |   Rows:         4171                                                 
>       |
>  |   Columns:      3280                                                 
>       |
>  |   Total Cells:  13680880                                             
>       |
>  |        Projection: x,y                                               
>       |
>  |            N:       4171    S:          0   Res:     1               
>       |
>  |            E:       3280    W:          0   Res:     1               
>       |
>  |   Range of data:    min = 0  max = 255                               
>       |
>  |                                                                       
>      |
>  |   Data Description:                                                   
>      |
>  |    generated by r.in.gdal                                             
>      |
>  |                                                                       
>      |
>  |   Comments:                                                           
>      |
>  |    r.in.gdal input="/gis/oahu_flightlines/D/D-10\   |
>  |    .jpg" output="D-10"                                               
>       |
>  |                                                                       
>      |
>  +----------------------------------------------------------------------------+ 
> 
> 
> Computer:
> 
> Mac Pro 2.66GHz, 2 dualcore Intel Xeon (4 cores total), 4Gb RAM
> 
> GRASS:
> 
> GRASS 6.3.0RC4 (2008)
> 
> 
> 
> Luis E. Menoyo
> U.S. Geological Survey
> 677 Ala Moana Blvd., Suite 415
> Honolulu, HI  96813
> lemenoyo at usgs.gov
> 808-587-2428
> 
> 
> ------------------------------------------------------------------------
> 
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