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A GIS/LIS Approach for Study on Suitability of Shallow Foundation at Southern Chennai, India In order to develop a comprehensive spatial database the present work was carried out using Arc- info/ Arcview at 1: 12500 scale. The study was carried out for a small region in the south of chennai, India. The work involves development of spatial framework using available maps and GPS survey, followed by digitization, building topology, verification and analysis. The primary data used for the work includes area of state boundary, bore log data, soil survey data, village boundary data where as the derived data includes soil map, Iso penetration resistance map and suitability map. Study Area The study area involves Kalikundram, Kottivakkam, Tharamani and Thiruvanmiyur of Chengalpattu district at the south chennai, India. The study area lies between 80° 15' 00" E - 80° 16' 50" E Longitude and 12° 58' 30" N - ---Latitude. The extent of the study area is 1058.2 Hectares with more than 5000 inhabitance. The area is semi-urban with majority of the population depending on various commercial and industrial setting in the near by city, chennai. Generation of Primary Thematic Maps The village boundary map obtained from the office of Chennai Metropolitan Development Agency (CMDA) consisting the study area were separately demarcated, digitized and blended to prepare base map. Land use map, which includes various landuse patterns, was obtained from CMDA and other sources as a raw map followed by digitization. The Transportation network consisting of roads, railways, MRTS and canals are collected from Highway research station (HRS) digitized in a separate layer. Borehole location map (Fig 1) with various geotechnical parameters (discussed in forth coming paragraph) was procured from various private consultant in non-spatial format and was geo referenced-using hand held GPS and subsequently digitized. A soil map (Fig 2) is prepared (with respective five predominant soil types namely clay overlain by silty sand, clayey soil, clay with embedded sand, sandy soil, silty sand with overlying clay sediment) by actual sampling aided by GPS. 
Iso – Penetration Resistance Map From the subsurface investigation SPT N(standard penetration resistance – number for blows for 30 cm penetration, gives indirectly SBC of the soil) at different depths were inputted in the Surfer (Copyright Golden Software Incorporated, 1993-96: for windows version 6xx). By using Kriging interpolation technique, Isolines or Iso SPT N contours were generated at their respective depths. These ISO SPT N contours were converted into Arc coverage. The Arc coverage was edited, cleaned, projected and transformed to form Iso SPT N map. Attributes are added to this thematic map. |