Monitoring urban Sprawl in Kanpur Metropolis, India, using Multidate Satellite data
Data Used & Methodology
The following data were used in the assessment of landuse/landcover categories and in monitoring changes in the urban sprawl:
- Survey of India topographical maps on 1:50,000 scale (published 1977, surveyed 1974-75).
- Landsate MSS FCC Bands 4,5,7, (Path & Row No. 155-042) of December 12, 1975 on 1:250,000 scale.
- Enlarged Landsat TM FCC Bands 2,3,4 (Path & Row No. 144-042) of March 2, 1986 on 1:62,500 scale.
- IRS-1A LISSs-2 FCC bands 2,3,4 (Path & Row No. 26-49) of January 15, 1989 on 1:125,000 scale.
The Survey of India topographical maps on 1:50,000 scale of kanpur City were used as the threshold base maps (Fig.2) from which the relevant ground truth information was extracted for interpretation of Landsat MSS FCC of December 2, 1975 since there was correspondence of the two data sets. The visual interpretation of Landsat MSS FCC was carried out with a view to identifying the different mappable categories of urban landuse/landcover following the usual elements of interpretation. Using this as a data base , the information on landuse/landcover categories extracted by the visual interpretation of Landsat TM FCC of March 2,1986 and IRS-1A FCC of January 15, 1989 were transferred on the base map. A series of visits were also made in the city area for verification and collection of ground truth. The information on the urban landuse patterns was integrated and urban landuse/landcover maps were prepared for the different dates. The spatial extent of the city growth was thereafter computed and growth pattern analysed for town planning purposes.
Results & Discussions
1. Urban Landuse Categorisation:
Based on the visual interpretation of Landsat MSS FCC of December 12, 1975, Enlarged TM Data of March 2, 1986 and IRS-1A Data of January 15, 1989, it has been possible to compare the extent of extraction of information related to urban landuse categories. The following table gives the comparison of the information interpreted from the different satellite data used in the present study. It is evident from the Table-1 that only five categories of urban landuse could be delineated from Lnadsat MSS data of 1975. While 28 urban landuse classes could be extracted from the Landsat TM, and 26 categories were identified from IRS-1A data.
