r.volume outputs' Total volume = 0
Prior to v.surf.rst ,
I used r.digit to create a MASK to select region of interest by hand in
the imported raster map.
Then ran v.surf.rst by inputting the digitized vector point map and the
MASK created.
Gave an interpolated raster map for the selected region.
Then used r.clump to create a clump raster containing 27 clumps by
inputing interpolated raster.
Then ran r.volume and inputed the interpolated raster and this clump raster.
Result was as follows:
Volume report on data from surfoutdigit using clumps on surfclump map
Cat Average Data # Cells Centroid
Total
Number in clump Total in clump Easting Northing Volume
1 1.00 90521 90521 76.30
9.93 0.00
2 2.00 113958 56979 76.30
9.93 0.00
3 3.00 144480 48160 76.30 9.93
0.00
4 4.00 189556 47389 76.30 9.93
0.00
5 5.00 308695 61739 76.30
9.93 0.00
6 6.00 1306716 217786 76.30
9.93 0.00
7 7.00 400414 57202 76.30 9.93
0.00
8 8.00 211728 26466 76.30 9.93
0.00
9 5.00 506595 101319 76.30 9.93
0.00
10 4.00 784616 196154 76.29 9.93
0.00
11 3.00 88668 29556 76.29 9.93
0.00
12 2.00 41640 20820 76.29 9.93 0.00
13 1.00 18870 18870 76.29 9.93 0.00
14 5.00 11560 2312 76.29 9.93 0.00
15 7.00 1309735 187105 76.30 9.93 0.00
16 -1.00 -1 1 76.29
9.93 -0.00
17 -1.00 -1 1 76.29
9.93 -0.00
18 -1.00 -2 2 76.29
9.93 -0.00
19 -1.00 -2 2 76.29
9.93 -0.00
20 -1.00 -127 127 76.29
9.93 -0.00
21 -1.00 -1 1 76.29
9.93 -0.00
22 -1.00 -2 2 76.29
9.93 -0.00
23 -1.00 -2 2 76.29
9.93 -0.00
24 -1.00 -1330 1330 76.29 9.93 -0.00
25 5.00 39830 7966 76.30 9.93 0.00
26 6.00 6 1 76.30
9.93 0.00
27 5.00 5 1 76.30
9.93 0.00
Total Volume
= 0.00
Where am i going wrong? kindly help.
Regards
Nagesh
Moritz Lennert wrote:
On 05/08/08 06:37, Nagesh Bhatkar wrote:
Dear all,
I imported and digitized a hydrographic chart for depth vector points
in the ocean and
vector lines along the coast enclosing these ocean waters.
I am looking to the interpolate these randomly digitized depth points
over a grid of any resolution and then later compute the volume of
the water in the ocean
channel between two land masses.
Which modules of GRASS GIS would help me accomplish the above two tasks.
Interpolation:
v.surf.rst
v.surf.idw
r.surf.nnbathy (Add-On)
etc
volume calculation:
r.volume
Moritz
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