Thirty villages in Kolar taluk were chosen for detailed land use analyses and determine the spectral signatures of fuelwood species. The villages were selected such that it represents all types of land use and vegetative cover. Selected villages were surveyed in two phases and are listed in Figure 3. Each land use element is mapped in these villages using GPS. Figure 4.1 and figure 5.1 provides the digitised field maps of Iragasandra and Huthur villages of Kolar taluk respectively. Corresponding IRS 1C data are given in Figure 4.2 and Figure 5.2. Spectral response patterns of various land use elements and fuelwood species is obtained by over laying these layers ( Figure 4.1 and Figure 4.2, figure 5.1 and Figure 5.2). Similar exercise is being carried out for all 30 villages and the spectral response pattern of predominant species in selected villages is given in Table 3.

Prosopis juliflora is predominant in Iragasandra and Huthur villages and spectral signature varies between 93 - 104. Further investigation was carried out in these villages to find out spectral response pattern and reasons for variations. For this purpose, training sites such as areas with adult trees, juvenile plants, trees sparsely spread, mixed with other species were mapped with GPS. This effort narrowed down the spectral response of adult thick patches of Prosopis juliflora to 95-97.

This information was used to carry out Prosopis juliflora mapping in Gauribidanur taluk and the distribution is given in Figure 6. In order to verify the accuracy of mapping, few sites were chosen. Figure 7 provides IRS 1C - Band 2, Band 3, Band 4 and PAN Images. Figure 8.1 provides the fused image of multispectral and PAN images for Gauribidanur taluk. Merging of multispectral and PAN data enabled in distinguishing Prosopis juliflora patches. Figure 8.2 maps the patches chosen for verification and validation of mapping. Accuracy of mapping is about 88%.