[GRASSLIST:5558] i.composite problem: gives minmax 1:1, grass5
Philipp Molzer
phil at molzer.net
Fri Feb 14 20:17:25 EST 2003
Hi,
Running grass5 on Linux RH8, I've imported a USGS aerial photo in JPEG
format with
r.in.gdal -o input=294.JPG output=294.JPG
This gives me an imagery group called 294.JPG
and 3 raster files called 294.JPG.1, 294.JPG.2, and 294.JPG.3
Each of the raster files has a data range of 0..255 and is viewable with
d.rast
I'd like to plot the image with proper colors with d.rast so I first ran
g.region rast=294.JPG.1
r.support -r map=294.JPG.1
r.support -r map=294.JPG.2
r.support -r map=294.JPG.3
and then
i.composite (interactively) on 294.JPG, choosing
b=294.JPG.1
g=294.JPG.2
r=294.JPG.3
colorsteps=10
output=294.JPG.COMP
This did give me a decent color table with a range of 1..1000
The problem is that 294.JPG.COMP has a data range of 1..1
so I get a blank image.
What am I doing wrong?
Phil
The info on each file is below:
--------------030508040504050606000504
Content-Type: text/plain;
name="294.info.txt"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
filename="294.info.txt"
GRASS:/DATA/GIS/NJ/STATE/ORTHO_PHOTO > r.info 294.JPG.COMP
+----------------------------------------------------------------------------+
| Layer: 294.JPG.COMP Date: Wed Feb 12 18:34:42 2003 |
| Mapset: state1 Login of Creator: pmolzer |
| Location: njstat1 |
| DataBase: /home/pmolzer/grassdata |
| Title: ( 294.JPG.COMP ) |
|----------------------------------------------------------------------------|
| |
| Type of Map: raster Number of Categories: 1 |
| Data Type: CELL |
| Rows: 7712 |
| Columns: 5893 |
| Total Cells: 45446816 |
| Projection: State Plane (zone 0) |
| N: 744029 S: 720894 Res: 2.99987033 |
| E: 596069 W: 578389 Res: 3.00016969 |
| Range of data: min = 1 max = 1 |
| |
| Data Source: |
| |
| |
| |
| Data Description: |
| generated by i.composite |
| |
| |
+----------------------------------------------------------------------------+
GRASS:/DATA/GIS/NJ/STATE/ORTHO_PHOTO > r.info 294.JPG.1
+----------------------------------------------------------------------------+
| Layer: 294.JPG.1 Date: Wed Feb 12 13:47:41 2003 |
| Mapset: state1 Login of Creator: pmolzer |
| Location: njstat1 |
| DataBase: /home/pmolzer/grassdata |
| Title: ( 294.JPG.1 ) |
|----------------------------------------------------------------------------|
| |
| Type of Map: raster Number of Categories: 255 |
| Data Type: CELL |
| Rows: 7003 |
| Columns: 5342 |
| Total Cells: 37410026 |
| Projection: State Plane (zone 0) |
| N: 766677.2211896 S: 743564.63485144 Res: 3.3003836 |
| E: 561405.43303879 W: 543774.78385723 Res: 3.3003836 |
| Range of data: min = 0 max = 255 |
| |
| Data Source: |
| |
| |
| |
| Data Description: |
| generated by r.in.gdal |
| |
| |
+----------------------------------------------------------------------------+
GRASS:/DATA/GIS/NJ/STATE/ORTHO_PHOTO > r.info 294.JPG.2
+----------------------------------------------------------------------------+
| Layer: 294.JPG.2 Date: Wed Feb 12 13:47:58 2003 |
| Mapset: state1 Login of Creator: pmolzer |
| Location: njstat1 |
| DataBase: /home/pmolzer/grassdata |
| Title: ( 294.JPG.2 ) |
|----------------------------------------------------------------------------|
| |
| Type of Map: raster Number of Categories: 255 |
| Data Type: CELL |
| Rows: 7003 |
| Columns: 5342 |
| Total Cells: 37410026 |
| Projection: State Plane (zone 0) |
| N: 766677.2211896 S: 743564.63485144 Res: 3.3003836 |
| E: 561405.43303879 W: 543774.78385723 Res: 3.3003836 |
| Range of data: min = 0 max = 255 |
| |
| Data Source: |
| |
| |
| |
| Data Description: |
| generated by r.in.gdal |
| |
| |
+----------------------------------------------------------------------------+
GRASS:/DATA/GIS/NJ/STATE/ORTHO_PHOTO > r.info 294.JPG.3
+----------------------------------------------------------------------------+
| Layer: 294.JPG.3 Date: Wed Feb 12 13:48:15 2003 |
| Mapset: state1 Login of Creator: pmolzer |
| Location: njstat1 |
| DataBase: /home/pmolzer/grassdata |
| Title: ( 294.JPG.3 ) |
|----------------------------------------------------------------------------|
| |
| Type of Map: raster Number of Categories: 255 |
| Data Type: CELL |
| Rows: 7003 |
| Columns: 5342 |
| Total Cells: 37410026 |
| Projection: State Plane (zone 0) |
| N: 766677.2211896 S: 743564.63485144 Res: 3.3003836 |
| E: 561405.43303879 W: 543774.78385723 Res: 3.3003836 |
| Range of data: min = 0 max = 255 |
| |
| Data Source: |
| |
| |
| |
| Data Description: |
| generated by r.in.gdal |
| |
| |
+----------------------------------------------------------------------------+
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