Comparative Analysis of Digital Elevation Models: A Case Study of Kayadhu Watershedle
Abstract
In last few years, Digital Elevation Models (DEMs) have established more popular due to their diverse utility and applications in the fields like hydrology, forestry, precision farming, geomorphology etc. DEM is used for characterizing the topography and to derive the stream network, ridge line, thereby to study the landscape within the watershed area. DEMs from satellite imageries like Cartosat -1 is becoming popular with wide applications. The resolution is allowed for comparison is the DEM of ISRO (30m) (cartosat-1). These DEMs were created using different methods and technologies, and they can differ in how they represent the topography of the same area. This study shows that the differences in these DEMs and illustrates how these differences can produce various analytical outcomes when used to study local problems. The primary objective of this study is to compare the accuracy of Cartosat -1 DEM and DEM generated from Google earth. The google earth DEM is generated with the help of ‘Triangulation’ which is SAGA (System for Automated Geoscientific Analyses) tool. For the comparison of both the DEMs, Kayadhu watershed is taken as study area. The comparative analysis of DEM is carried out on the basis of the Stream network and contours of 5m, 10m and 15m interval with their respective lengths. The counts of contours of Cartosat -1 DEM for 5 m, 10 m and 15 m interval was found to be 27794, 27954 and 18184 respectively with contour lengths at that respective interval about 30503.2 km, 12803.7 km and 8421.45 km. The counts of contours of Google Earth DEM for 5 m, 10 m and 15 m interval was found to be 1485, 776 and 492 respectively with contour lengths at that respective interval about 8308.45 km, 4112 km and 2741 km. From this study the stream counts of Cartosat-1 DEM and Google Earth DEM was found to be 34449 and 52668 with stream length about 432 km and 1134 km respectively. This study has been carried out in open source environment viz. QGIS, SAGA, GRASS GIS and Google Earth. In this study, the Cartosat -1 DEM and Google earth DEM has minimum to maximum elevation from the mean sea level was found to be 336 m to 481 m and 408.7 m to 549.3m respectively. From the study, it is observed that Cartosat-1 DEM has more accuracy than DEM generated from Google Earth. Therefore, the Cartosat -1 DEM gives clear 3D topography than DEM generated from google earth.
References
[2] Lakshmi, S.E. and Yarrakula, K., 2017. Comparative analysis of digital elevation models: A case study around Madduleru River. Indian Journal of Geo Marine Sciences, Vol. 46 (07), pp. 1339-1351.
[3] Murthy, Y.N.K., Rao, S.S., Rao, D.P. and Jayaraman, V., 2008. Analysis of DEM generated using Cartosat-1 stereo data over Mausanne Les Alpiles–Cartosat scientific appraisal programme (CSAP TS–5). The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 37.
[4] Patel, A.K., 2012. Comparison of different source digital elevation models with carto-DEM. International Journal of Remote Sensensing Geoscience (IJRSG), 1, pp.27-33
To ensure uniformity of treatment among all contributors, other forms may not be substituted for this form, nor may any wording of the form be changed. This form is intended for original material submitted to AJCT and must accompany any such material in order to be published by AJCT. Please read the form carefully.
The undersigned hereby assigns to the Asian Journal of Convergence in Technology Issues ("AJCT") all rights under copyright that may exist in and to the above Work, any revised or expanded derivative works submitted to AJCT by the undersigned based on the Work, and any associated written, audio and/or visual presentations or other enhancements accompanying the Work. The undersigned hereby warrants that the Work is original and that he/she is the author of the Work; to the extent the Work incorporates text passages, figures, data or other material from the works of others, the undersigned has obtained any necessary permission. See Retained Rights, below.
AUTHOR RESPONSIBILITIES
AJCT distributes its technical publications throughout the world and wants to ensure that the material submitted to its publications is properly available to the readership of those publications. Authors must ensure that The Work is their own and is original. It is the responsibility of the authors, not AJCT, to determine whether disclosure of their material requires the prior consent of other parties and, if so, to obtain it.
RETAINED RIGHTS/TERMS AND CONDITIONS
1. Authors/employers retain all proprietary rights in any process, procedure, or article of manufacture described in the Work.
2. Authors/employers may reproduce or authorize others to reproduce The Work and for the author's personal use or for company or organizational use, provided that the source and any AJCT copyright notice are indicated, the copies are not used in any way that implies AJCT endorsement of a product or service of any employer, and the copies themselves are not offered for sale.
3. Authors/employers may make limited distribution of all or portions of the Work prior to publication if they inform AJCT in advance of the nature and extent of such limited distribution.
4. For all uses not covered by items 2 and 3, authors/employers must request permission from AJCT.
5. Although authors are permitted to re-use all or portions of the Work in other works, this does not include granting third-party requests for reprinting, republishing, or other types of re-use.
INFORMATION FOR AUTHORS
AJCT Copyright Ownership
It is the formal policy of AJCT to own the copyrights to all copyrightable material in its technical publications and to the individual contributions contained therein, in order to protect the interests of AJCT, its authors and their employers, and, at the same time, to facilitate the appropriate re-use of this material by others.
Author/Employer Rights
If you are employed and prepared the Work on a subject within the scope of your employment, the copyright in the Work belongs to your employer as a work-for-hire. In that case, AJCT assumes that when you sign this Form, you are authorized to do so by your employer and that your employer has consented to the transfer of copyright, to the representation and warranty of publication rights, and to all other terms and conditions of this Form. If such authorization and consent has not been given to you, an authorized representative of your employer should sign this Form as the Author.
Reprint/Republication Policy
AJCT requires that the consent of the first-named author and employer be sought as a condition to granting reprint or republication rights to others or for permitting use of a Work for promotion or marketing purposes.
GENERAL TERMS
1. The undersigned represents that he/she has the power and authority to make and execute this assignment.
2. The undersigned agrees to indemnify and hold harmless AJCT from any damage or expense that may arise in the event of a breach of any of the warranties set forth above.
3. In the event the above work is accepted and published by AJCT and consequently withdrawn by the author(s), the foregoing copyright transfer shall become null and void and all materials embodying the Work submitted to AJCT will be destroyed.
4. For jointly authored Works, all joint authors should sign, or one of the authors should sign as authorized agent
for the others.
Licenced by :
Creative Commons Attribution 4.0 International License.
