Digital Elevation Model (DEM) is the core data for three-dimensional visualization and geographical spatial analysis. With the implementation of Digital Earth, the amount of various DEM data is rapidly expanding. In order to compress DEM data, researchers ever put forward two kinds of DEM compression methods: Generic entropy encoding compression; Converting grid DEM to TIN DEM [1][2]. In recent...

Simulations of total runoff and fine sediment yield in Goodwin Creek watershed, which covers 21Ð3 km2 in Mississippi, were carried out using a hydrological model-GIS system. The system includes the recently released Soil and Water Assessment Tool (SWAT) model version 2000 and AVSWAT version 1Ð0, the supporting interface with ArcView GIS. Among the required GIS input, some are commonly available...

A Precious natural asset and prime resource for the basic need a human is water. Groundwater which commonly available as freshwater sources beneath earth's surface widely used in many parts of world domestic agricultural activities. In this present work, groundwater potential zone identification done by using remote sensing GIS. The thematic maps like soil, rainfall, drainage, DEM land use cove...

Existing studies of the atomic hydrogen gas content in distant galaxies, through the absorption of the 21-cm line, often infer that the total column density, NHI, is anticorrelated with the linear extent of the background radio source, dem. We investigate this interpretation, by dissecting the various parameters from which NH I is derived, and find that the relationship is driven primarily by t...

To determine the potential habitat of two rangeland species of Salsola rigidaand Agropyron trichophorum in Qasr-e-Shirin, Iran, Geographic Information Systems(GIS) and Remote Sensing (RS) techniques were used. At first, several maps (vegetationcover and land uses maps and thematic maps of various organizations) were collected orprepared. For digitizing geology, vegetation and conventional state...

Remote sensing portal site for practical uses which is dedicated to local governments is created. Key components of the site are (1) links to data providers, (2) links to the data analysis software tools, (3) examples of actual uses of the satellite remote sensing data in particular for local governments. Users’ demands for remote sensing satellite data are investigated for the local government...

Terrain patterns play an important role in determining the nature of water resources and related hydrological modelling. Digital Elevation Models (DEMs), offering an efficient way to represent ground surface, allow automated direct extraction of hydrological features (Garbrecht and Martz, 1999), thus bringing advantages in terms of processing efficiency, cost effectiveness, and accuracy assessm...