Hi Everyone,
I'm using GRASS 6.4.0/6.4.1 on Ubuntu Lucid to orthorectify aerial imagery.
When I try to export the orthorectified images using r.out.gdal, every
pixel gets NoData value, whereas the image displays perfectly in GRASS.
For some strange reason it was working last week. Then I included the
unstable ubuntugis repository
(http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu) and
installed qgis. I probably installed some updates coming from this repo,
including gdal-bin and GRASS. I tried to remove qgis and
ubuntugis-unstable and reinstall GRASS, but I just can't get it to export
any of the raster maps. I tried to export my images in both 6.4.1 and
6.4.0 without success.
I use the following command (tried explicitly defining file type (byte)
and nodata value (255) as well, nothing worked):
r.out.gdal -c input=FIM90271_0008blue.ortho@PERMANENT output=blue.tif
the metadata of the input raster map:
Type of Map: raster Number of Categories: 241
| Data Type:CELL
| Rows:15181
| Columns:15348
| Total Cells:232997988
| Projection: Transverse Mercator
| N: 6734134.5 S: 6726544 Res: 0.5
| E: 3352185.5 W: 3344511.5 Res: 0.5
| Range of data: min = 0 max = 241
Data Description:
| generated by i.photo.rectify
Comments:
| i.photo.rectify -a group="FIM90271_0008" extension=".ortho"
resolution=0.500000 memory=1000 method="nearest"
The same problem appears with WinGrass 6.4.1.
Could someone enlighten me what might be the problem?
Thanks a lot in advance!
Andras