scholarly journals GIS-Based Digital Terrain Analysis of Assam-Meghalaya Foothills in Kamrup District, Assam

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
C. Borpujari ◽  
A. K. Bora
Keyword(s):  
Geographical Information ◽  
Terrain Analysis ◽  
Gis And Remote Sensing ◽  
Shuttle Radar Topographic Mission ◽  
Detailed Assessment ◽  
Spatio Temporal ◽  
Remote Sensing Techniques ◽  
Elevation Model ◽  
The Impact ◽  
Terrain Characteristics

Terrain characteristics and their evaluation usually come under geomorphological study and more particularly the applied geomorphological study (Prasad & Sarkar 2011). Foothills are a geographically defined zone having a gradual increase in elevation at the base of a mountain or hill range. Detailed assessment of the present terrain parameters of the study area using GIS is significant as it shows the influence on the landscape of the area. It is a prerequisite in effective management of the impact of transition upon the landscape and its natural resources for sustainable management. In the study, an attempt has been made to delineate the foothill belt of the Assam-Meghalaya border in Kamrup District, Assam using Geographical Information system (GIS), and remote sensing techniques. Datasets available from USGS Earth Explorer, i.e. Shuttle Radar Topographic Mission (SRTM) and Digital Elevation Model (DEM) are used for analyzing the elevation, contour, slope, and terrain characteristics. The present study aims at getting an information archive of the geomorphological and terrain characteristics of the Assam-Meghalaya foothills in Kamrup District, Assam, and its spatio-temporal variation.

scholarly journals Mapping glaciers in Jotunheimen, South-Norway, during the "Little Ice Age" maximum

2009 ◽  
Vol 3 (2) ◽  
pp. 231-243 ◽  
Author(s):  
S. Baumann ◽  
S. Winkler ◽  
L. M. Andreassen
Keyword(s):  
Little Ice Age ◽  
18Th Century ◽  
Field Measurements ◽  
Geographical Information ◽  
Ice Age ◽  
Inventory Data ◽  
Digital Elevation ◽  
Remote Sensing Techniques ◽  
Southern Norway ◽  
Elevation Model

Abstract. The maximum glacier extent during the "Little Ice Age" (mid 18th century AD) in Jotunheimen, southern Norway, was mapped using remote sensing techniques. Interpretation of existing glaciochronological studies, analysis of geomorphological maps, and own GPS-field measurements were applied for validation of the mapping. The length of glacier centrelines and other inventory data were determined using a Geographical Information System (GIS) and a Digital Elevation Model. "Little Ice Age" maximum extent for a total of 233 glaciers comprising an overall glacier area of about 290 km2 was mapped. Mean length of the centreline was calculated to 1.6 km. Until AD 2003, the area and length shrank by 35% and 34%, respectively, compared with the maximum "Little Ice Age" extent.

scholarly journals Developing Low-Cost Inundation Maps for Dam Failures: Modeling and Analysis of a Potential Dam Failure for the Péligre Dam in Haiti

2019 ◽  
Author(s):  
Adam Jachimowicz ◽  
Shiyan Zhang ◽  
Dan Jakubek
Keyword(s):  
Low Cost ◽  
Significant Risk ◽  
Dam Failure ◽  
Gis And Remote Sensing ◽  
Modeling And Analysis ◽  
Inundation Maps ◽  
Crucial Component ◽  
Remote Sensing Techniques ◽  
Inundation Map ◽  
The Impact

Dam failure relates to significant risk of human lives, property, and the environment protection. Understanding the risk that a dam introduces is significant for making contingency plans. After a dam failure an inundation map is a crucial component to understand the impact of flooding that will occur. This paper takes Péligre Dam in Haiti as the study area, using an innovative approach for producing inundation maps and estimate consequences. This research uses GIS and remote sensing techniques to merge DEM and generate land cover as data preprocessing, and subsequently uses the DSSWISE Lite System to develop the flood simulation and generate an inundation map for further estimation of life loss. It demonstrates the potential for the production of low-cost accurate inundation maps for dam failed emergencies that can be applied in other developing countries. As the result of the simulation with setting of a moderate breach of 100 meters that developed over 1 hour, it was estimated that 65 fatalities would occur and 202 buildings would be destroyed based on it.

scholarly journals Identification of ground water recharge potential zones by using remote sensing and geographic information system

2020 ◽  
Vol 7 (1) ◽  
pp. 33
Author(s):  
Ballu Harish ◽  
Mahammad Haseena
Keyword(s):  
Remote Sensing ◽  
Information System ◽  
Ground Water ◽  
Water Potential ◽  
Drainage Density ◽  
Groundwater Potential ◽  
Geographical Information ◽  
Groundwater Potential Zones ◽  
Gis And Remote Sensing ◽  
Remote Sensing Techniques

<p><strong>Background: </strong>The ground water is the most precious and important resource around the world and is decreasing day by day. In connection, there is a need to bound the potential groundwater zones. The geographical information system (GIS) and remote sensing techniques have become important tools to locate groundwater potential zones.</p><p><strong>Methods</strong>: This research has been carried out to identify ground water potential zones in Nuthankal Mandal with help of GIS and remote sensing techniques. In order to evaluate the ground water potential zones, different thematic maps such as geology, slope, soil, drainage density map, land use and land cover and surface water bodies i.e., lakes and other using remotely-sensed data as well as toposheets and secondary data, collected from concern department. The prepared layers are further used for mapping and identification of ground water potential zones.</p><p><strong>Results</strong>: In this study ground water potential zones are demarked with the help of composite maps, which are generated using GIS tools. The accurate information to obtain the parameters that can be considered for identifying the ground water potential zone such as geology, slope, drainage density and lineament density are generated using the satellite data and survey of India (SOI) Topo-sheets, the groundwater potential zones are classified into five categories like very poor, poor, moderate, good &amp; very good. The use of suggested methodology is demonstrated for a selected study area in Nuthankal Mandal.</p><p><strong>Conclusions</strong>: This groundwater potential information was also used for identification of suitable locations for extraction of water.</p>

scholarly journals The Rate and Pattern of the Spatio-Temporal Expansion of Rangpur City Corporation, Rangpur, Bangladesh

2021 ◽  
pp. 74-83
Author(s):  
. Hasnahena ◽  
Subaran Chandra Sarker ◽  
Md. Sahidul Islam ◽  
Md. Zakiur Rahman
Keyword(s):  
Urban Areas ◽  
Supervised Classification ◽  
Satellite Images ◽  
Thematic Mapper ◽  
Shannon’S Entropy ◽  
Gis And Remote Sensing ◽  
Shannon's Entropy ◽  
Spatio Temporal ◽  
Remote Sensing Techniques ◽  
Entropy Technique

Analyzing the spatio-temporal growth of the built-up areas of any urban place is incredibly much vital for the proper planning and development of the urban areas. The present study emphasizes on determining the rate and pattern of spatio-temporal growth of Rangpur City Corporation (RpCC) for the year of 1989, 2000, 2010, and 2017 through Shannon's Entropy with the help of GIS and remote sensing techniques. The Shannon's Entropy technique was adopted in order to determining the dispersion or compactness in the pattern of the built-up areas in the study area. In the present study, Lands at Operational Land Imager (OLI), Lands at Thematic Mapper (TM) and Lands at Enhanced Thematic Mapper plus (ETM+) satellite images on the year of 1989, 2000, 2010, and 2017 were analyzed for certain interpretations. The changes of the built-up areas in RpCC were identified and determined through supervised classification using ArcMap10.5 software. The study indicated that spatio-temporal growth of the built-up areas have been in RpCC was existed during 1989-2017. The built-up areas increased by 5.89 Sq.km. during 1989 -2000, 32.23 Sq.km. during 2000- 2010 and 18.85 Sq.km. during 2010-2017 and the expansion rate of the built-up areas was 8.02%, 25.64% and 6.01% during 1989-2000, 2000-2010 and 2010-2017 respectively. The relative entropy value of 1989, 2000, 2010 and 2017 was found 0.17, 0.24, 0.47 and 0.53 which interprets that the expansion of the built-up areas was existed in RpCC and the pattern of expansion was dispersed. However, the outcomes of this study will be very helpful to formulate perfect planning and management system regarding the expansion of the built-up areas the built-up areas expansion of RpCC.

scholarly journals Assessing high altitude glacier thickness, volume and area changes using field, GIS and remote sensing techniques: the case of Nevado Coropuna (Peru)

2010 ◽  
Vol 4 (3) ◽  
pp. 313-323 ◽  
Author(s):  
P. Peduzzi ◽  
C. Herold ◽  
W. Silverio
Keyword(s):  
Remote Sensing ◽  
Local Governments ◽  
Scientific Evidence ◽  
Geographical Information ◽  
Additional Stress ◽  
Ice Thickness ◽  
Volume Loss ◽  
Gis And Remote Sensing ◽  
Andean Glaciers ◽  
Remote Sensing Techniques

Abstract. Higher temperatures and changes in precipitation patterns have induced an acute decrease in Andean glaciers, thus leading to additional stress on water supply. To adapt to climate changes, local governments need information on the rate of glacier area and volume losses and on current ice thickness. Remote sensing analyses of Coropuna glacier (Peru) delineate an acute glaciated area decline between 1955 and 2008. We tested how volume changes can be estimated with remote sensing and GIS techniques using digital elevation models derived from both topographic maps and satellite images. Ice thickness was measured in 2004 using a Ground Penetrating Radar coupled with a Ground Positioning System during a field expedition. It provided profiles of ice thickness on different slopes, orientations and altitudes. These were used to model the current glacier volume using Geographical Information System and statistical multiple regression techniques. The results revealed a significant glacier volume loss; however the uncertainty is higher than the measured volume loss. We also provided an estimate of the remaining volume. The field study provided the scientific evidence needed by COPASA, a local Peruvian NGO, and GTZ, the German international cooperation agency, in order to alert local governments and communities and guide them in adopting new climate change adaptation policies.

scholarly journals Surface Runoff Estimation for Godavari Eastern Delta Using SCS Curve Number and Geographical Information System

2020 ◽  
pp. 7-13
Author(s):  
G. Kishore Kumar ◽  
M. Raghu Babu ◽  
A. Mani ◽  
M. Martin Luther ◽  
V. Srinivasa Rao
Keyword(s):  
Land Use ◽  
Surface Runoff ◽  
Andhra Pradesh ◽  
Curve Number ◽  
Geographical Information ◽  
Accurate Estimation ◽  
Entire Study ◽  
Gis And Remote Sensing ◽  
Erdas Imagine ◽  
Remote Sensing Techniques

NRSC-CN for surface runoff estimation is one of the most widely used methods. GIS and remote sensing techniques facilitate accurate estimation of surface runoff from an area. Water availability estimation can be understand by rainfall and runoff is essential. Runoff generated by rainfall is not only dependent on the intensity, duration and the distribution of rainfall, but also soil type, vegetation, and land-use types have significant effects on the runoff pattern. The present study aims to estimate runoff in a study area. The study was carried out in Godavari Eastern Delta in Andhra Pradesh, India. The land use/land cover map, soil map was prepared. The soil and land use map has been prepared by the information available at Andhra Pradesh space application centre. For the rectification of reference, soil and land use map of the study area ERDAS IMAGINE-8.4 software was used. For 30 years surface runoff was estimated, as the runoff value depends on the rainfall, trend of runoff was found to be highly dependable on the quantity of rainfall received within the entire study area. The yearly trend of rainfall during 1987 was 8.97 it’s but the other years, and therefore the runoff was also found to follow an equivalent trend. Similarly, for the year 1995, the runoff was recorded as high, which was also having the highest rainfall.

scholarly journals Morphometric analysis and watershed prioritization in relation to soil erosion in Dudhnai Watershed

2021 ◽  
Vol 11 (9) ◽  
Author(s):  
W. R. Singh ◽  
S. Barman ◽  
G. Tirkey
Keyword(s):  
Soil Erosion ◽  
Water Conservation ◽  
High Surface ◽  
Drainage Density ◽  
Morphometric Parameters ◽  
Geographical Information ◽  
Gis And Remote Sensing ◽  
Digital Elevation ◽  
Elevation Model

AbstractMorphologic parameters of a watershed could help in segregating critical sub-watersheds for taking up conservation practices and mitigation interventions. Determination of critical watersheds or prioritization of sub-watersheds is inevitable for efficient and sustainable watershed management programs and allocation of its natural resources. The traditional methods of determination of morphologic parameters are time consuming, expensive and requires huge labor. However, the process becomes easier, cheaper and faster with the advent of Geographical Information System (GIS) and remote sensing technologies. In the present study, a combined approach of using toposheet, remotely sensed digital elevation model and morphometric ArcGIS toolbox has been adopted to determine morphometric parameters in Dudhnai river basin, a sub-basin of river Brahmaputra which is prone to both erosion and sedimentation. Seven sub-watersheds of Dudhnai have been prioritized by using the morphometric parameters and ranked them according to its vulnerability to soil erosion. The results of bifurcation ratio, drainage density, drainage intensity and constant of channel maintenance showed that Dudhnai watershed is a well-dissected watershed with less risk to flooding and soil erosion. However, significantly high values of infiltration number and ruggedness number obtained are indicative of very low infiltration which may result in high surface runoff and soil erosion. The study also revealed that channel erosion is stronger than sheet erosion in the basin. The prioritization of the sub-watersheds implied that Chil sub-watershed is the most susceptible sub-watershed that needs greater attention for soil and water conservation measures. The results of the present study could aid various stakeholders who are involved in the watershed development and management programs.

Sign in / Sign up

Export Citation Format

Share Document