Table 3 Computed deviations (in %) of the respective parameter-wise values for each dataset from those of the surveyed toposheet values
Morphometric parameters | V-T50A | Amount of deviation of parameter values of respective datasets from T50A values (%) | ||||||
|---|---|---|---|---|---|---|---|---|
SRTM DEM (90 m) (S90) | ASTER GDEM (30 m) (A30) | Cartosat-1 DEM (30 m) (C30) | Topographical map (1:250,000) (T250A) | Topographical map (1:50,000) (T50A) | ASTER GDEM (resampled 90 m) (A90) | Cartosat-1 DEM (resampled 90 m) (C90) | ||
Catchment size properties | ||||||||
Basin Area (sq km) | 973.40 | +0.29 | +0.41 | −0.27 | −1.87 | 0 | +22.97 | +22.05 |
Basin perimeter (km) | 169.20 | +27.01 | +5.79 | +11.41 | −2.54 | 0 | +11.52 | +13.42 |
Basin length (km) | 52.65 | −0.04 | +0.38 | −0.28 | −1.92 | 0 | +3.13 | +1.61 |
Main channel length (m) | 62.54 | −7.48 | −3.47 | −3.45 | +0.59 | 0 | +17.29 | +12.36 |
Total channel length (km) | 1733.40 | +14.46 | +116.96 | +126.24 | −17.22 | 0 | +30.64 | +34.64 |
Total no. of stream segments | 1379 | +78.17 | +502.90 | +462.95 | −0.22 | 0 | +84.34 | +78.90 |
Relief attributes | ||||||||
Maximum relief (m) | 6317 | −0.16 | −0.52 | −6.74 | +0.54 | 0 | −1.00 | −6.89 |
Minimum relief (m) | 1302 | −2.07 | −1.54 | −5.61 | +3.15 | 0 | +0.31 | −4.15 |
Mean relief (m) | 3931.33 | −4.81 | +0.20 | −1.43 | −4.28 | 0 | −0.04 | −1.70 |
Relative relief (m) | 5015 | +0.34 | −0.26 | −7.04 | −0.14 | 0 | −1.34 | −7.60 |
Relief ratio | 95.61 | 0 | −1.00 | −7.12 | +2.04 | 0 | −4.70 | −9.40 |
Hypsometric integral | 0.52 | +1.92 | +1.92 | +7.69 | −5.77 | 0 | +1.92 | +7.69 |
Surface attributes | ||||||||
Maximum slope (degrees) | 69.25 | +5.04 | +20.95 | +19.99 | −11.58 | 0 | +1.17 | −5.40 |
Mean slope (degrees) | 26.24 | +8.003 | +14.558 | +11.17 | −22.98 | 0 | −5.72 | −14.02 |
Shape properties | ||||||||
Circularity ratio | 0.27 | 0 | +40.74 | +25.23 | +62.96 | 0 | +55.56 | +51.83 |
Elongation ratio | 0.67 | 0 | 0 | 0 | +1.49 | 0 | +7.46 | +8.96 |
Drainage textural parameters | ||||||||
Bifurcation ratio | +4.24 | +8.02 | +4.01 | +1.65 | +14.38 | 0 | +11.32 | +7.54 |