Remote Sensing And Gis Based Urban Sprawl Susceptibility Analysis A Case Study Of Shashamane Town West Arsi Zone Ethiopia

In this paper, analysis was made on the urban sprawl susceptibility of the town ofrnShashamanne using remote sensing and GIS techniques. To quantify and measure the urbanrnsprawl, an assessment was made on the extent and rate of land use/land cover (lulc) changernusing multi-temporal landsat images during 1986, 2000 and 2011 and Shannon’s entropyrnindex. The supervised classification algorithm was employed to identify the major landrnuse/land cover types in the study area and they were categorized into 4 types: agriculturalrnlands, urban/built up areas, vegetated lands and bare fields. Being the focus was on thernspatial extent of built up areas; the LULC maps were further simplified into built up andrnnon-built up areas. With Shannon’s Entropy approach the degree of dispersion orrnconcentration of built up area’s development or sprawl was described. Finally, to predictrnurban sprawl susceptibility of the study area the parameters such as land use/land coverrnduring 2011, slope, population density and distances from major road axis and rivers werernintegrated using MCE function in ArcGIS. Results indicated that the study area hasrnundergone a tremendous change in urban growth and pattern during the study period.rnPredominantly at the expense of agricultural lands and vegetated areas in the hinterlands,rnbuilt-up area was increased from 1977 ha (in 1986) to 2677 ha (in 2000) and further rose torn4329 ha (in 2011). Shashamanne town was expected to have sprawl pattern types of etherrnlinear/strip along highways, or expansion/cluster, or leapfrog as common to other urbanrncenters in the world. However, in reality, the town has rather had irregular sprawl patternrntype that is termed here as amoeboid shape. This is to mean that sprawl phenomenon in thernstudy areas was of a variable irregular pattern showing the combination of the three sprawlrnpatterns: linear/strip along highways, expansion/cluster and leapfrog. The analysis madernon urban sprawl susceptibility revealed that, of the total area of the study site 1023 ha (8%),rn5279 ha (41%) and 394 ha (3%) were respectively, highly, moderately and marginallyrnsusceptible to sprawling. This implies that large areas that are currently reserved as informalrngreen spaces, fertile farming lands and other natural resources have been threatened.rnKeywords: Urban Sprawl susceptibility, GIS and Remote Sensing tools, LULCrnChange, Urban Sprawl Measurement, Shashamanne Town.

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