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@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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