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Abstract
Integration of DEMs, Satellite Imagery, and Field Data for Alpine Vegetation Mapping in Pakistan
Track: Ecology, Archaeology, and Conservation
Author(s): Salman Ashraf, Kate Crossing, Qaisar Nadeem
Elevation, slope, and aspect significantly influence vegetation heterogeneity in mountain ecosystems. Remotely sensed surface reflectance, if used to analyze such heterogeneity, is substantially affected by differences induced by slope and aspect. A GIS combining DEMs, Landsat 7 imagery, and georeferenced field data was built to map the distribution of vegetation in two community-based conservancies in the Hindukush cordillera of Pakistan. DEMs were used to divide satellite imagery into high and low incident radiation categories before image classification. Field verification and empirical rules relating to the altitude and aspects at which different vegetation types occur were then used to refine the classification.
Salman Ashraf
WWF-Pakistan
GIS Lab
P.O.Box 5180
Ferozepur Road
Lahore , Punjab 54600
Pakistan
Phone: +92 42 588 2069
Fax: +92 42 586 2358
E-mail: salmanashraf@usa.net
Kate Crossing
WWF-Pakistan
GIS Lab.
P.O.Box 5180
Ferozepur Road
Lahore , Punjab 54600
Pakistan
Phone: +92 42 586 9429
Fax: +92 42 586 2358
E-mail: katecrossing@hotmail.com
Qaisar Nadeem
WWF-Pakistan
GIS Lab.
P.O.Box 5180
Ferozepur Road
Lahore , Punjab 54600
Pakistan
Phone: +92 42 586 2360
Fax: +92 42 586 2358
E-mail: qaisars@brain.net.pk