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MODIS Satellite vegetation indices over partially vegetated pixels on the Arctic Coastal Plain of Alaska

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dc.contributor.author Macander, Matt
dc.date.accessioned 2015-09-22T00:46:52Z
dc.date.available 2015-09-22T00:46:52Z
dc.date.issued 2005-08
dc.identifier.uri http://hdl.handle.net/11122/5994
dc.description Thesis (M.S.) University of Alaska Fairbanks, 2005 en_US
dc.description.abstract The performance and response of the MODIS Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) were evaluated over the Arctic coastal plain of Alaska. At the 250-l000-m resolution of moderate resolution sensors, a substantial portion of this landscape is a mixture of vegetated and non-vegetated cover types. Single-date MODIS swath scenes were used because of the higher geolocation accuracy, lack of radiometric artifacts, and temporal specificity. A higher resolution earth cover classification was used to sample pixels with a mixture of vegetation, water, and barren ground. The MODIS NDVI and EVI were compared to aggregated Landsat ETM+ NDVI. The subpixel ETM+ NDVI was a good predictor of the MODIS EVI in all mixed pixels, and of the MODIS NDVI in mixed vegetation and barren ground pixels. In these cases a simple linear relationship between subpixel ETM+ NDVI and the MODIS vegetation indices was observed. In the mixed pixels with vegetation and water, the MODIS NDVI had a curvilinear response to the ETM+ NDVI and the performance decreased as the subpixel water fraction increased. Spectral mixture modeling was then applied to synthesize mixed pixel spectral values and plot the response of the MODIS vegetation indices to subpixel non-vegetated fractions. The MODIS NDVI had a highly variable response to subpixel fractions of different non-vegetated backgrounds, while the MODIS EVI was fairly insensitive to background type. The models also suggest that large changes in observed NDVI values could occur due to changes in the spectral characteristics of the non-vegetated portion of a pixel-in particular, the conversion of ice to water in subpixel water fractions. en_US
dc.description.tableofcontents Introduction -- MODIS data formats and processing algorithms : considerations for Alaska -- Performance of MODIS NDVI and EVI over partially vegetated pixels on the Arctic coastal plain of Alaska -- Performance of MODIS NDVI and EVI over partially vegetated pixels on the Arctic coastal plain of Alaska -- Modeling the response of MODIS NDVI and EVI over mixed pixels in Arctic Alaska with spectral mixture models -- Conclusions. en_US
dc.language.iso en_US en_US
dc.title MODIS Satellite vegetation indices over partially vegetated pixels on the Arctic Coastal Plain of Alaska en_US
dc.type Thesis en_US
dc.type.degree ms en_US
dc.identifier.department Department of Forest Sciences en_US


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