Evaluation of different digital elevation models for analyzing drainage morphometric parameters in a mountainous terrain: a case study of the Supin–Upper Tons Basin, Indian Himalayas

Das, Sayantan; Patel, Priyank Pravin; Sengupta, Somasis

doi:10.1186/s40064-016-3207-0

SpringerPlus

Table 10 Similarity in extracted values and isoline zones for the different parameters from various datasets in comparison to the T50A dataset

From: Evaluation of different digital elevation models for analyzing drainage morphometric parameters in a mountainous terrain: a case study of the Supin–Upper Tons Basin, Indian Himalayas

Sl. No.	Dataset	Difference class from T50A values	Average elevation			Relative relief			Slope			Drainage density			Averaged totals	Remarks
Sl. No.	Dataset	Difference class from T50A values	Difference class range (m)	% Basin area	Total %	Difference class range (m)	% Basin area	Total %	Difference class range (degrees)	% Basin area	Total %	Difference class range (km / sqkm)	% Basin area	Total %	Averaged totals	Remarks
1	A30	Immediate greater	−100 to 0	47.19	85.42	−250 to 0	40.06	99.26	−10 to 0	80.85	94.23	−2 to 0	11.55	50.20	82.28	Very high match
1	A30	Immediate lesser	0 to 100	38.23	85.42	0 to 250	59.20	99.26	0 to 10	13.38	94.23	0 to 2	38.65	50.20	82.28	Very high match
2	A90	Immediate greater	−500 to 0	25.60	52.87	−250 to 0	38.53	72.24	−10 to 0	38.65	58.52	−2 to 0	32.01	70.78	63.60	Low match
2	A90	Immediate lesser	0 to 500	27.27	52.87	0 to 250	33.71	72.24	0 to 10	19.87	58.52	0 to 2	38.77	70.78	63.60	Low match
3	C30	Immediate greater	−100 to 0	50.75	65.55	−250 to 0	53.80	93.97	−10 to 0	70.93	82.41	−2 to 0	9.22	47.82	72.44	Moderate match
3	C30	Immediate lesser	0 to 100	14.80	65.55	0 to 250	40.17	93.97	0 to 10	11.48	82.41	0 to 2	38.60	47.82	72.44	Moderate match
4	C90	Immediate greater	−500 to 0	27.04	54.62	−250 to 0	42.15	69.62	−10 to 0	37.41	50.80	−2 to 0	32.32	71.20	61.56	Low match
4	C90	Immediate lesser	0 to 500	27.58	54.62	0 to 250	27.47	69.62	0 to 10	13.39	50.80	0 to 2	38.88	71.20	61.56	Low match
5	S90	Immediate greater	−100 to 0	48.74	86.23	−250 to 0	62.39	98.94	−10 to 0	80.68	87.65	−2 to 0	39.68	76.85	87.42	Very high match
5	S90	Immediate lesser	0 to 100	37.49	86.23	0 to 250	36.55	98.94	0 to 10	6.97	87.65	0 to 2	37.17	76.85	87.42	Very high match
6	T50D	Immediate greater	−100 to 0	60.61	94.12	−250 to 0	94.88	99.86	−10 to 0	82.81	84.76	−2 to 0	48.77	78.48	89.31	Highest match
6	T50D	Immediate lesser	0 to 100	33.51	94.12	0 to 250	4.98	99.86	0 to 10	1.95	84.76	0 to 2	29.71	78.48	89.31	Highest match
7	T250A	Immediate greater	−500 to 0	46.95	74.96	−250 to 0	30.60	47.43	−10 to 0	31.43	52.04	−2 to 0	48.55	71.57	61.50	Lowest match
7	T250A	Immediate lesser	0 to 500	28.01	74.96	0 to 250	16.83	47.43	0 to 10	20.61	52.04	0 to 2	23.02	71.57	61.50	Lowest match
8	T250D	Immediate greater	−500 to 0	47.16	74.93	−250 to 0	38.64	58.79	−10 to 0	29.67	42.83	−2 to 0	41.85	79.06	63.90	Low match
8	T250D	Immediate lesser	0 to 500	27.77	74.93	0 to 250	20.15	58.79	0 to 10	13.16	42.83	0 to 2	37.21	79.06	63.90	Low match

Differences for each dataset are computed parameter-wise by subtracting from the corresponding values of that same parameter in the T50A database for each of the 1154 grids and isopleth classes are then demarcated on basis of this difference. Thus the immediate greater class (where T50A values are higher) and immediate lesser class (where T50A values are lower) together show areas which are more closely approximate to the values of the surveyed T50A database. If these two ranges combined, cover a greater proportion of the basin area, it implies then that that dataset matches well with the surveyed topographical map database, in terms of the parameters extracted and their ensuing isopleth zones. Perfect matching would give a narrow difference class range around zero covering the total basin area

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