Effect of DEM data resolution on low relief region sub-watershed boundaries delineating using of SWAT model and DEM derived from CARTOSAT-1 (IRS-P5), SRTM and ASTER
Journal Title: Journal of Applied and Natural Science - Year 2014, Vol 6, Issue 1
Abstract
Watersheds are natural integrators of hydrological, biological, and geological processes and as such require an integrated approach to data analysis and modeling, which usually starts delineating accurately a polygon vector layer of watershed boundaries as input. In that way, Garrah sub-watershed in Shahjahanpur district of U.P., India, had been isolated with the objective of evaluate the accuracy of sub-watershed boundaries derived from three different sources: One was delineated by 2.6 m resolution CARTOSAT-1 DEM (IRS-P5) and other two were derived from a 30 m ASTER DEM and a 90 m SRTM DEM, using the Soil and Water Assessment Tool (SWAT) model. In this analysis we found that the accuracy of CARTOSAT-1 DEM is so best for accurate delineation of a sub -watershed in the management of the watershed, and the coarse spatial resolution SRTM DEM (90 m) performed much better and significantly than the high spatial resolution ASTER DEM (30 m) it’s cause of the errors in the ASTER DEM, map algebra was used to define where the “Fill” tool had filled the sinks finding that the errors in the stream network occurred where some especially large fills had occurred. Not only the visual interpretation of the produces figures indicate the SRTM DEM delineated sub-watershed as relatively more accurate from ASTER DEM delineated sub-watershed boundaries, also statistics for the SRTM DEM elevation turned in significantly higher than that of the ASTER DEM. Overall SRTM DEMs offer more precise elevations while, ASTER DEMs offer more details. Therefore, the accuracy of the sub-watershed delineation depends on the first place on the accuracy of the DEM.
Authors and Affiliations
Kishan Rawat, Gopal Krishna, Amresh Mishra, Jitendra Singh, Shashi Mishra
Keywords
Related Articles
- EP ID EP110567
- DOI 10.31018/jans.v6i1.391
- Views 59
- Downloads 0
Studies on combining ability and gene action for yield and quality traits in Baby corn (Zea mays L.)
An investigation was carried out to assess the combining ability and nature of gene action in baby corn (Zea mays L.) genotypes, by making crosses of eight inbred lines namely, HKI 3209, SML 1, EC 595979, CM 128, VQL 1,...
Emergence of extended spectrum beta-lactamase (ESBLs) producing Proteus in raw milk of DoonValley
The present study deals with the determination of extended spectrum of β -lactamase (ESBL) producing Proteus in raw milk of DoonValley. ESBL producing isolates were screened by double disc approximation test using commer...
Studies on development and storage stability of dehydrated pumpkin based instant soup mix
The study was carried out to develop and standardize Instant Soup Mix (ISM) from dehydrated pumpkin powder and to evaluate nutritional (moisture, sugars, protein, β-carotene, fat, fibre and water activity) and sensory qu...
Status of tomato Lycopersicon esculentum Mill.cultivation and pesticide use in Golapar area of Uttarakhand, India
Tomato is one of the most widely grown temperate vegetable crops grown in Himalayas and Tarai region of Northern India. Being the high value crop is important in raising the income of the farmers. However, from past few...
Assessment of genetic diversity using DNA markers among Brassica rapa var. yellow sarson germplasm lines collected from Eastern Uttar Pradesh and Uttarakhand hills
The genetic diversity and the relatedness among thirty-one germplasm lines of yellow sarson collected from eastern UP were evaluated using morphological characters and Random Amplified Polymorphic DNA (RAPD) markers. Mol...