[Qgis-user] problems with r.walk

ambijat ambijat at hotmail.com
Mon Apr 11 21:18:47 PDT 2011


Hi All,
I am trying to generate a map with r.walk (elevation raster and cost 
raster(by r.cost) as input). But, the map is mostly blank and the values 
it generates is like this.

-----------------------------------------------------------------------------+
|                         RASTER MAP CATEGORY 
REPORT                          |
|LOCATION: Afghanistan                                Tue Apr 12 
09:47:01 2011|
|-----------------------------------------------------------------------------|
|          north:     36N    east:  
69:45E                                    |
|REGION    south:  34:30N    west:  
68:15E                                    |
|          res:   0:00:03    res:  
0:00:03                                    |
|-----------------------------------------------------------------------------|
|MASK:none                                                                    
|
|-----------------------------------------------------------------------------|
|MAP: (untitled) (salang_walk at salang in 
salang)                               |
|-----------------------------------------------------------------------------|
|                        Category Information                         
|   cell|
| #|description                                                       |  
count|
|-----------------------------------------------------------------------------|
| 0| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      2|
| 1| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      2|
| 2| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      2|
| 3| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      3|
| 4| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
| 5| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      2|
| 6| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      3|
| 7| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
| 8| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      4|
| 9| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      4|
|10| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|14| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|15| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|19| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|31| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|33| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|37| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|49| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|51| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
|63| . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|      1|
| *|no data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
.|3239966|
|-----------------------------------------------------------------------------|
|TOTAL                                                                
|3240000|
+-----------------------------------------------------------------------------+


The null values are the most generated. And, therefore there is no 
further going with r.drain. Kindly, provide me some help.

thanks and regards,

Ambrish Dhaka



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