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Estimating vegetation cover from high-resolution satellite data to assess grassland degradation in the Georgian Caucasus

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10.1659_mrd_journal_d_15_00064.1.pdf (3.381Mb)
Date
2016
Author
Wiesmair, Martin
Feilhauer, Hannes
Magiera, Anja
Otte, Annette
Waldhardt, Rainer
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http://dx.doi.org/10.22029/jlupub-8620
Abstract

In the Georgian Caucasus, unregulated grazing has damaged grassland vegetation cover and caused erosion. Methods for monitoring and control of affected territories are urgently needed. Focusing on the high-montane and subalpine grasslands of the upper Aragvi Valley, we sampled grassland for soil, rock, and vegetation cover to test the ... applicability of a site-specific remote-sensing approach to observing grassland degradation. We used random-forest regression to separately estimate vegetation cover from 2 vegetation indices, the Normalized Difference Vegetation Index (NDVI) and the Modified Soil Adjusted Vegetation Index (MSAVI2), derived from multispectral WorldView-2 data (1.8 m). The good model fit of R2 = 0.79 indicates the great potential of a remote-sensing approach for the observation of grassland cover. We used the modeled relationship to produce a vegetation cover map, which showed large areas of grassland degradation.

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https://doi.org/10.1659/mrd-journal-d-15-00064.1
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