Figure - uploaded by Sidhartha Sawai
Content may be subject to copyright.
Source publication
In this work we have used SRTM 90 and 30m, ASTER 30m and 60 cm Google Earth (GE) based elevation data generated using online tool Terrain Zonum, validation was performed with respect to Survey of India (SOI) toposheet. These results are important for those areas where limited field data are available. It also provides a benchmark for validation of...
Contexts in source publication
Context 1
... overall statistics of elevation is maximum, minimum, mean and standard deviation of elevation values are obtained to examine differences in elevation in different DEM. Results are presented in Table 2. Table 2, there is a little change in the computed statistics for elevation where the percentage change around 0.54 % between the highest (from SRTM 90m and ASTER 30m) and lowest (from GE) value for the maximum elevation where maximum elevation values exhibited 2770m computed from the SRTM 90m and ASTER 30m DEM, and 2768m computed from the 30m SRTM DEM. ...Context 2
... overall statistics of elevation is maximum, minimum, mean and standard deviation of elevation values are obtained to examine differences in elevation in different DEM. Results are presented in Table 2. Table 2, there is a little change in the computed statistics for elevation where the percentage change around 0.54 % between the highest (from SRTM 90m and ASTER 30m) and lowest (from GE) value for the maximum elevation where maximum elevation values exhibited 2770m computed from the SRTM 90m and ASTER 30m DEM, and 2768m computed from the 30m SRTM DEM. This indicates that with the digital elevation models that have smallest cell size the maximum elevation becomes slightly underestimated. ...Similar publications
Watershed management is an essential part to achieve sustainability. In the case of large watersheds, management and conservation practices cannot be implemented efficiently over the entire area due to inadequate human resources and financial support. Therefore, prioritizing the sub-watersheds and implementation of management practices would be a v...
Quantification of drainage networks in relation to geomorphology, lithology, climate, and tectonics gives important evidence of an area’s hydro-geomorphic, denudation characteristics, and drainage development. The current research used the Shuttle Radar Topographic Mission (SRTM) DEM to investigate drainage morphometry and its impact upon the envir...
https://rigeo.sgb.gov.br/handle/doc/22311 - The Tietê River rises in the Serra do Mar in the municipality of Salesópolis/SP, cuts across the entire State of São Paulo from East to West, and is considered its main river, flows into the left bank of the Paraná River on the border between the State of São Paulo and Mato Grosso do Sul, helping making u...
Usinas hidrelétricas causam impactos que são usualmente estimados por um indicador que é a potência hidrelétrica produzida por hectare de área inundada e, apesar dos empreendedores utilizarem bases cartográï¬cas com qualidade declarada para atender às normas, nas etapas de projeto de usinas, não é veriï¬cado com segurança, a priori, se a tolerânc...
The Desert Andes contain >4500 ice masses, but only a handful are currently being monitored. We present the mass changes of the small mountain glacier Agua Negra (1 km ² ) and of the rest of glaciers in the Jáchal river basin. Remote-sensing data show Agua Negra glacier lost 23% of its area during 1959–2019. Glaciological measurements during 2014–2...
Citations
... In relation to the assessment, a clear formulation of the comparison method to be followed is lacking, but the majority of the papers offer a ranking of the GDEM analyzed (e.g., [65,[107][108][109][110]), although very few propose some kind of procedure to combine various analysis perspectives in a metric that allows ordering of the analyzed GDEMs ( [68,111]). There are numerous cases in which several criteria are used, but without resulting in an ordering of the available GDEM. ...
From an extensive search of papers related to the comparison of Global Digital Elevation Models (hereinafter GDEMs), an analysis is carried out that aims to answer several questions such as: Which GDEMs have been compared? Where have the comparisons been made? How many comparisons have been made? How have the assessments been carried out? Which is the GDEM option with the lowest RMSE? Analysis shows that SRTM and ASTER are the most popular GDEMs, that the countries where more comparisons have been made are Brazil, India, and China, and that the main type of reference data for evaluations is the use of points surveyed by GNSS techniques. A variety of criteria have been found for the comparison of GDEMs, but the most used are the RMSE and the standard deviation of the elevation error. There are numerous criteria with a more user-centric character in thematic areas, such as morphometry, geomorphology, erosion, etc. However, in none of the thematic areas does there exist a standard method of comparison. This limits the possibilities of establishing a ranking of GDEMs based on their user-focused quality. In addition, the methods and reference data set are not adequately explained or shared, which limits the interoperability of the studies carried out and the ability to make robust comparisons between them.
Time Domain Reflectometer (TDR, model Field ScoutTM TDR 300) has been used in soil science community for in-situ measurements of soil water content (SWC) due to its simplicity, fast and accurate results. TDR instrument has the capacity to measure SWC at ground without any laboratory testing and efforts. In this study, TDR have used two parallel probes of 7.5 cm length to calculate soil volumetric water content (VWC). Finally, soil moisture results were compared with laboratory based soil moisture using nine statistical tests and weightage rating analysis. Based on the analysis we found that VWC based on linear model has significant soil moisture predicting ability at field level. Based on research work we recommend dense TDR network over large fields for accurate estimation of SWC.
