Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis
نویسندگان
چکیده
In polar regions, vegetation is especially sensitive to climate dynamics and thus can be used as an indicator of the global regional environmental change. However, in Antarctica, there very little information on distribution growth status. To fill this gap, we evaluated ability both linear nonlinear spectral mixture analysis (SMA) models, including a group newly developed modified Nascimento’s models for Antarctic vegetated areas (MNM-AVs), estimating abundance major types, i.e., mosses lichens. The study was conducted using WorldView-2 satellite data field measurements over Fildes Peninsula its surroundings, which are representative Antarctica. MNM-AVs, introduced secondary scattering components background account sparsity cover reassigned their coefficients. new achieved improved performances, among MNM-AV3 lowest error (lichens) estimation with RMSE = 0.202 (0.213). Compared model performed particularly poor lichens (RMSE 0.322), contrast case 0.212), demonstrating that signals more prone mix backgrounds. Abundance maps lichens, well map moss health status entire area, were then obtained based around 80% overall accuracy. Moss 0.7695 km2 0.3259 Ardley Island; unhealthy amounted 40% (49%) area summer 2018 (2019), indicating considerable stress.
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ژورنال
عنوان ژورنال: Remote Sensing
سال: 2021
ISSN: ['2315-4632', '2315-4675']
DOI: https://doi.org/10.3390/rs13020166