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Assessment of Urban Sprawl on Agricultural Soil of Northern Nile Delta of Egypt Using RS and GIS

Chinese Geographical Science 2015年第3期25卷 274-282页

作者： Adel SHALABY Farahat Saad MOGHANM National Authority for Remote Sensing and Space Sciences Soil and Water Science Department-faculty of Agricultural-Kafrelsheikh University

Urban sprawl is threatening the limited highly fertile land in the Nile delta of Egypt. landsat TM satellite images of 1984, 1992 and ETM+ of 2006 have been used to study the impact of urban sprawl on agricultural land of the Northern Nile delta, Egypt. Visual interpretation using on screen digitizing and change detection techniques were applied for monitoring the urban sprawl. Combining the land capability map and the urban thematic layer using GIS made it possible to point out the risk of urban expansion on the expense of the highly capable soil class. The results show that a total expansion of urban area amounted to 689.20 km2(6.3% of total area) during the study period 1984–2006. The urban expansion during the 1984–2006 was on the expense of the most fertile soils where, the high capable soils(Class I) lost 247.14 km2(2.26 % of total area) and the moderate capable soils lost 32.73 km2(0.3% of total area), while the low capable soils lost only 57.39 km2(0.53% of total area). The urban encroachment over the non capable soils was very limited during the study period 1984–1992, where 7.33 km2 only was lost. The pattern of urban sprawl has been changed during the 1992 to 2006 whereas much larger area(50.64 km2) of the non capable soils was converted to urban. It can be concluded that the urban sprawl is one of the dominant degradation process on the land of Nile Delta.

关键词： urbanization remote sensing GIS land cover changes land use policy Nile Delta of Egypt

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Proposed Relief Map of the Suitability of the Maranhão River Basin, Brazil, for Anthropogenic use

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Journal of Geographic Information System 2016年第3期8卷 351-360页

作者： Valdir A. Steinke Ercilia Torres Steinke Mario Diniz Araujo Neto Maria Ligia Cassol Pinto University of Brasilia Brasília Brazil

In this paper, we proposed a method for mapping the suitability of land for intensive anthropogenic use in the Maranhao River Basin, in the state of Goiás, Brazil. We analyzed existing 1:250,000 maps of the local geology, drainage system topography and geomorphological features. We generated new information based on our analysis, including a compilation of basic morphometric data and a map of the slopes in the basin, which we used to construct the geomorphological suitability map of the watershed. Our results indicate that 40% of the study area can support intensive anthropogenic use;the remaining 60% of the basin area is categorized as “fragile” regarding the expansion of intensive land use.

关键词： Morphometry GIS Environmental Management Suitability of the Watershed land use policy

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