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Flood hazard assessment and mapping using GIS integrated with multi-criteria decision analysis in upper Awash River basin, Ethiopia
Floods have destroyed people’s lives as well as social and environmental assets. Flooding is becoming more severe and frequent as a result of climate change and an increase in human-induced land-use changes, which puts pressure on river channels and causes changes in river morphology. The study was aimed to assess flood danger and map inundation areas in Ethiopia’s Teji watershed, which is prone to flooding. The basic flood-producing factors in this study were derived from soil, slope, elevation, drainage-density and land use land cover data. The opinions of public institutions and expert decisions were gathered to determine the weight of the factors in the analytic hierarchy process. The collected data were processed using the ArcGIS environment and the analytic hierarchy method to produce a flood danger map. According to the findings of this study, approximately 43.28 and 13.09% of the area were vulnerable to high and very high flood risk zones, respectively. As a result, flood prediction, early warning and management practices could be implemented on a regular and sustainable basis.
Journal Article
Mapping Greece, 1420-1800 : a history : maps in the Margarita Samourkas Collection
\"Illustrated history of the cartography of Greece during the Renaissance and Enlightenment. Examines cartographic tradition, surveying technology, and map production as it changed over time. Contains a detailed catalogue of the 1,700 maps of Greece in the Margarita Samourka Map Collection\"--Provided by publisher.
P_MAP
Integration of different influencing factors in GIS to delineate groundwater potential areas using IF and FR techniques: a study of Pravara basin, Maharashtra, India
In the present days, remote sensing and geographic information system (GIS) techniques are comprehensive tools for the assessment of water resource, its management and conservation. In this study, remote sensing and GIS techniques are taken into consideration for zonation of different groundwater prospects of Pravara basin. Several contributing factors in which groundwater potential of an area entirely or partially depends such as lithology, geomorphology, slope, soil, lineament density, drainage density, land use and rainfall are assessed individually as well as together for making the different groundwater prospect maps through influencing factor (IF) and frequency ratio (FR) techniques. In ArcGIS software, all these thematic layers are prepared using different satellite imageries and conventional data sets, obtained from different sources. All these layers are transformed into high-resolution raster format and meshed together in GIS environment using IF and FR methods. Groundwater prospect maps are constructed as a result of overlay analysis. Based on the constructed map of groundwater prospect zones, as a result of this study, the study area is divided into five categories of different groundwater potential zones: very high, high, moderate, low and very low. Validation of the resultant maps has shown that frequency ratio technique is having higher accuracy (AUC = 73%) compared to the influencing factors (AUC = 69%). The present study of groundwater zonation provides a simple and less time-consuming technique; also, the results can directly be used for planning and sustainable management in Pravara basin.
Journal Article
Assessment and delineation of groundwater potential zones using integrated geospatial techniques and analytic hierarchy process
Hydrogeologists and other allied professionals involved in the exploration and management of water resources have benefited greatly from the integration of geospatial techniques and remote sensing (RS) applications for identifying prospective or possible groundwater availability zones. This method is progressively becoming a viable alternative to the traditional geophysical survey for groundwater (GW) exploration, which is costly, time-consuming, and labour-intensive. This research explored the applicability of integrating RS, geospatial technologies and multi-criteria decision analysis (MCDA) for mapping and classifying GW potential zones in Bosso Local Government Area of Niger State in Northern-Nigeria. Five thematic maps were produced which represent the factors that influence and control the occurrence and transportation of GW. These factors are geology, lineament density, slope, land use and land cover, and drainage density. Normalized weights were assigned to these factors using analytic hierarchy process (AHP) based on their relative influence on occurrence and transportation of GW. Weighted overlay was implemented in a GIS environment to model the MCDA resulting to a GW potential map (GWPM). The produced GWPM was classified into four classes: ‘Very low’, ‘Low’, ‘Moderate’, and ‘High’ representing 3, 1, 85 and 11% of the total study area, respectively. The obtained result was validated using datasets obtained via hydrogeophysical techniques (vertical electrical sounding), and the result shows 68% positive correlation with the integrated remote sensing approach. The generated GWPM is recommended as an essential tool for water resource developers, and government agencies in charge of sourcing and distributing potable water resource in the study area.
Journal Article
Ecotourism sustainability assessment using geospatial multiple approach in the Kurdistan region of Iraq
Identifying the potential of ecotourism sustainability is one of the priorities of many countries, it is a goal for effective and efficient resource use on earth. Analyzing the growth of the economy and conservation methods for sustainable developing countries can be achieved by determining the possibility of ecotourism sustainability. And, it is essential to base the evaluation on sustainable development. This study assesses and maps the potential for sustainable ecotourism development using geospatial multiple approaches. Using 28 casual indicators within the three major groups of criteria of natural attraction, human attraction, and service tourism attraction were determined and integrated according to geospatial multi-criteria decision analysis. The indicators were prepared from different resources and standardization, criteria ranking, weighting, and spatial aggregation were performed to carry out the ecotourism suitability map in the Kurdistan region of Iraq (KRI). The result has produced a map to identify areas with a high potential for ecotourism sustainability in (KRI). The ecotourism sustainability map shows that about (54%) of the study area has a rating of very high, very good, and good suitability. This means the majority of the study area has a high potential for sustainable ecotourism development. It can be concluded that GIS—Multi-criteria decision analysis (MCDA) has a good ability in combining multiple datasets to produce suitability maps. The results could be used as a basis for tourism-related development plans by the Kurdistan region government and private sector.
Journal Article
Mr. Selden's map of China : decoding the secrets of a vanished cartographer
\"Timothy Brook's award-winning Vermeer's Hat unfolded the early history of globalization, using Vermeer's paintings to show how objects like beaver hats and porcelain bowls began to circulate around the world. Now he plumbs the mystery of a single artifact that offers new insights into global connections centuries old.In 2009, an extraordinary map of China was discovered in Oxford's Bodleian Library--where it had first been deposited 350 years before, then stowed and forgotten for nearly a century. Neither historians of China nor cartography experts had ever seen anything like it. It was so odd that experts would have declared it a fake--yet records confirmed it had been delivered to Oxford in 1659. The \"Selden Map,\" as it is known, was a puzzle that needing solving. Brook, a historian of China, set out to explore the riddle. His investigation will lead readers around this elegant, enigmatic work of art, and from the heart of China, via the Southern Ocean, to the court of King James II. In the story of Selden's map, he reveals for us the surprising links between an English scholar and merchants half a world away, and offers novel insights into the power and meaning that a single map can hold. Brook delivers the same anecdote-rich narrative, intriguing characters, and unexpected historical connections that made Vermeer's Hat an instant classic\"-- Provided by publisher.
Book
Meteorological drought in the upper Noteć catchment area (Central Poland) in the light of NDVI and SPI indicators
The currently used standardised precipitation index (SPI) does not allow for a reliable assessment of the impact of drought due to the small and unevenly distributed network of meteorological stations. Hopes for developing methods to assess the impact of droughts are pinned on remote data acquisition and the use of analysis of aerial photographs and satellite scenes. The aim of this study is to assess the occurrence of drought based on the normalised difference vegetation index (NDVI) and SPI at multiple time scales (1-, 3-, and 6-, 9- and 12-month). NDVI values do not simply reflect meteorological drought. However, the spatial co-occurrence of meteorological drought with drought defined on the basis of the NDVI index was demonstrated. The study presents a new approach to identifying drought characterized by SPI and NDVI based on the bivariate choropleth map method, which can indicate the actual places of drought occurrence. The study was carried out for the upper Noteć catchment located in Central Poland.
Journal Article