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Details van artikel 9 van 28 gevonden artikelen
| Titel: |
Geomorphology and reflectance patterns of vegetation-covered dunes at the Tsodilo Hills, north-west Botswana |
| Auteur: |
Jacobberger, P. A. Hooper, D. M. |
| Verschenen in: |
International journal of remote sensing |
| Paginering: | Jaargang 12 (1991) nr. 11 pagina's 2321-2342 |
| Jaar: |
1991-11-01 |
| Inhoud: |
Seasonal reflectance variations in semi-arid environments provide a means of assessing vegetation health and density as well as monitoring landform processes. We have used multi-temporal Landsat Thematic Mapper scenes with field measurements to map geomorphology and vegetation density in a stabilized dune environment and to measure seasonal reflectance changes for a series of ten geomorphological and vegetation units on the Kalahari-age linear dunes near the Tsodilo Hills, northwestern Botswana. Dune morphology is degraded and dunes are stabilized by mopane woodland vegetation. Units were chosen based on differences in landform and proportion of trees, forbs and bare soil. Reflectance curves and Normalized Difference Vegetation Indices (NDVI) calculated for December 1986 and March, June and August 1987 show that dune crests have the strongest seasonal variability in colour and brightness. Interdune corridors show a few percentage variation and sandy plains units in general showed little seasonal variation. The geomorphological link with reflectance and NDVI values may be due to biomass production and zoning of vegetation with slope, drainage and subtle soil differences. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 28 gevonden artikelen
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