<br><font size=2 face="sans-serif">It looks like i.rectify processes the
complete target area instead of just the image area to be rectified.</font>
<br>
<br><font size=2 face="sans-serif">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?</font>
<br>
<br><font size=2 face="sans-serif">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.
</font>
<br>
<br><font size=2 face="sans-serif">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.
</font>
<br>
<br><font size=2 face="sans-serif">x-y location</font>
<br>
<br><font size=2 face="sans-serif">g.region -p</font>
<br>
<br><font size=2 face="sans-serif">projection: 0 (x,y)</font>
<br><font size=2 face="sans-serif">zone: 0</font>
<br><font size=2 face="sans-serif">north: 4171</font>
<br><font size=2 face="sans-serif">south: 0</font>
<br><font size=2 face="sans-serif">west: 0</font>
<br><font size=2 face="sans-serif">east: 3280</font>
<br><font size=2 face="sans-serif">nsres: 1</font>
<br><font size=2 face="sans-serif">ewres: 1</font>
<br><font size=2 face="sans-serif">rows: 4171</font>
<br><font size=2 face="sans-serif">cols: 3280</font>
<br><font size=2 face="sans-serif">cells: 13680880</font>
<br>
<br>
<br><font size=2 face="sans-serif">Target location</font>
<br>
<br><font size=2 face="sans-serif">g.region -p</font>
<br>
<br><font size=2 face="sans-serif">projection: 1 (UTM)</font>
<br><font size=2 face="sans-serif">zone: 4</font>
<br><font size=2 face="sans-serif">datum: nad83</font>
<br><font size=2 face="sans-serif">ellipsoid: grs80</font>
<br><font size=2 face="sans-serif">north: 2401345.47908</font>
<br><font size=2 face="sans-serif">south: 2350807.60197392</font>
<br><font size=2 face="sans-serif">west: 574439.74229936</font>
<br><font size=2 face="sans-serif">east: 640164.771271</font>
<br><font size=2 face="sans-serif">nsres: 1.2962086</font>
<br><font size=2 face="sans-serif">ewres: 1.29619826</font>
<br><font size=2 face="sans-serif">rows: 38989</font>
<br><font size=2 face="sans-serif">cols: 50706</font>
<br><font size=2 face="sans-serif">cells: 1976976234</font>
<br>
<br>
<br><font size=2 face="sans-serif">Luis E. Menoyo<br>
U.S. Geological Survey<br>
677 Ala Moana Blvd., Suite 415<br>
Honolulu, HI 96813<br>
lemenoyo@usgs.gov<br>
808-587-2428</font>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>Moritz Lennert <mlennert@club.worldonline.be></b>
</font>
<p><font size=1 face="sans-serif">01/19/08 10:32 AM</font>
<td width=59%>
<table width=100%>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">Luis E Menoyo <lemenoyo@usgs.gov></font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td><font size=1 face="sans-serif">grass-user@lists.osgeo.org</font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [GRASS-user] i.rectify - how long
is too long</font></table>
<br>
<table>
<tr valign=top>
<td>
<td></table>
<br></table>
<br>
<br>
<br><tt><font size=2>On 19/01/08 00:25, Luis E Menoyo wrote:<br>
> <br>
> I'm using 1st order and 13 GCPs on an image and i.rectify has been
<br>
> running over 3 hours. Is the process locking up or is this amount
of <br>
> time normal in image rectification? Is i.rectify processing
just the <br>
> area of the image to be rectified, of is it calculating for the whole
<br>
> target mapset area? In other words, should I have applied a
mask to the <br>
> target mapset before running the georectify tool in order to cut down
on <br>
> processing time?<br>
<br>
What are your region settings in the target location, especially the <br>
resolution ? This can make an enormous difference in terms of <br>
calculation time.<br>
<br>
<br>
Moritz<br>
<br>
> <br>
> Any info would be greatly appreciated.<br>
> Thanks!<br>
> <br>
> Image info:<br>
> <br>
> +----------------------------------------------------------------------------+
<br>
> <br>
> | Layer: D-10@PERMANENT
Date: Fri Jan 18 08:17:14 <br>
> 2008 |<br>
> | Mapset: PERMANENT
Login of Creator: me
|<br>
> | Location: x-y
<br>
> |<br>
> | DataBase: /gis/oahu_flightlines
|<br>
> | Title: ( D-10 )
<br>
> |<br>
> | Timestamp: none
<br>
> |<br>
> |----------------------------------------------------------------------------|
<br>
> <br>
> |
<br>
> |<br>
> | Type of Map: raster
Number of Categories: 255 <br>
> |<br>
> | Data Type: CELL
<br>
> |<br>
> | Rows: 4171
<br>
> |<br>
> | Columns: 3280
<br>
> |<br>
> | Total Cells: 13680880
<br>
> |<br>
> | Projection: x,y
<br>
> |<br>
> | N:
4171 S: 0
Res: 1 <br>
> |<br>
> | E:
3280 W: 0
Res: 1 <br>
> |<br>
> | Range of data: min = 0 max = 255
<br>
> |<br>
> |
<br>
> |<br>
> | Data Description:
<br>
> |<br>
> | generated by r.in.gdal
<br>
> |<br>
> |
<br>
> |<br>
> | Comments:
<br>
> |<br>
> | r.in.gdal input="/gis/oahu_flightlines/D/D-10\
|<br>
> | .jpg" output="D-10"
<br>
> |<br>
> |
<br>
> |<br>
> +----------------------------------------------------------------------------+
<br>
> <br>
> <br>
> Computer:<br>
> <br>
> Mac Pro 2.66GHz, 2 dualcore Intel Xeon (4 cores total), 4Gb RAM<br>
> <br>
> GRASS:<br>
> <br>
> GRASS 6.3.0RC4 (2008)<br>
> <br>
> <br>
> <br>
> Luis E. Menoyo<br>
> U.S. Geological Survey<br>
> 677 Ala Moana Blvd., Suite 415<br>
> Honolulu, HI 96813<br>
> lemenoyo@usgs.gov<br>
> 808-587-2428<br>
> <br>
> <br>
> ------------------------------------------------------------------------<br>
> <br>
> _______________________________________________<br>
> grass-user mailing list<br>
> grass-user@lists.osgeo.org<br>
> http://lists.osgeo.org/mailman/listinfo/grass-user<br>
</font></tt>
<br>