sistema de informação geográfica
AGROVOC URI:
A diagnostic study of agricultural land use in the Southwest Brazilian Amazon
A GIS-based characterisation of livestock and feed resources in the humid and sub-humid zones in five countries in South East Asia
A GIS-based decision support tool for targeting biophysical and socioeconomic niches in tropical agriculture
A tool for community-based water resources management in hillsides watersheds. Thesis (Ph.D.)
Abaya-Chamo Lakes physical and water resources characteristics, including scenarios and impacts
A regional GIS model for water quality assessment in irrigated areas in France
An evaluation of the accuracy of DEM-derived altitude and slope values
This project was set up to investigate the level of accuracy which can be expected for slope and altitude values derived from low-cost Digital Elevation Models (DEMs). Eight gridded DEMs were generated from digitized contour maps at a range of scales:1:10,000 1:25,000 1:100,000 1:200,000 - and using a range of contour intervals 25m, 50m and 100m. A Control DEM was then produced using large scale aerial photographs (1:28,000) which were registered for auto-extraction of z-values using Helava software and accuracy tested using 91 differentially measured GPS ground control points.
An irrigated area map of the world (1999) derived from remote sensing
This document summarizes the materials and methods used to create a series of maps of irrigated areas of the world using remote sensing approaches. These maps are complementary to existing statistics (FAO-Aquastat) and the GISderived maps (FAO/University of Frankfurt Global irrigated area map). The document also provides details of how the estimates of global irrigated areas in one main season (net) and more than one season (intensity or annualized) were derived.