It looks like i.rectify processes the complete target area instead of just the image area to be rectified.
If I want to restrict the calculations to the area of interest, can I use r.mask or should I create a target location of only the area of interest? I would rather use r.mask, since I could change the mask depending on the area of interest. If that won't work, then I will create subset locations for each image or flight line. Thanks to Giovanni and Moritz. Your information is what leads me to believe that I must restrict calculations to the area of interest in order to make better use of computing resources. x-y location g.region -p projection: 0 (x,y) zone: 0 north: 4171 south: 0 west: 0 east: 3280 nsres: 1 ewres: 1 rows: 4171 cols: 3280 cells: 13680880 Target location g.region -p projection: 1 (UTM) zone: 4 datum: nad83 ellipsoid: grs80 north: 2401345.47908 south: 2350807.60197392 west: 574439.74229936 east: 640164.771271 nsres: 1.2962086 ewres: 1.29619826 rows: 38989 cols: 50706 cells: 1976976234 Luis E. Menoyo U.S. Geological Survey 677 Ala Moana Blvd., Suite 415 Honolulu, HI 96813 [EMAIL PROTECTED] 808-587-2428 Moritz Lennert <[EMAIL PROTECTED]> 01/19/08 10:32 AM To Luis E Menoyo <[EMAIL PROTECTED]> cc [email protected] Subject Re: [GRASS-user] i.rectify - how long is too long 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: [EMAIL PROTECTED] 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 > [EMAIL PROTECTED] > 808-587-2428 > > > ------------------------------------------------------------------------ > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user
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