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Digital Elevation Models for the Global Change Research Wetland

Submitted by ORNL DAAC Staff on 2021-03-24
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DEM of the Global Change Research Wetland (GCReW) site generated using the LEAN (LiDAR Elevation Correction with NDVI) method. LEAN uses ground measurements of elevation and NDVI in a multivariate linear regression model to estimate vertical bias.

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Four digital elevation models (DEMs) at 1-m resolution and 2106 model performance metrics for the GCReW site, Maryland, USA are now available.

Remote Sensing and Invasive Species

Submitted by ORNL DAAC Staff on 2020-05-26
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Searching for the term remote sensing and words related to invasive species (invasive, nonnative, exotic, or nonindigenous) in Google Scholar reveals an increasing number of publications each year using these terms.

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A new Earthdata article describes how researchers are using remote sensing to map invasive species.

Surveying the Ecological Effects of Fire on Alaska's Yukon-Kuskokwim Delta

Submitted by ORNL DAAC Staff on 2020-05-18
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Vegetation point-intercept (VPI) any-hit cover metric data were combined with Landsat imagery to develop fractional maps of any-hit cover for four aggregated plant functional types (PFTs);  shrubs bryophytes, lichen, and herbs for the upland tundra area of the Y-K Delta, Alaska. VPI data were collected from plots in areas burned in 1971, 1985, 2005, and 2015.

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Ecological field data and maps of vegetation cover spanning gradients of fire history in upland tundra are available from the Arctic-Boreal Vulnerability Experiment (ABoVE).

WAVeTrends: Trends in Woody and Herbaceous Vegetation

Submitted by ORNL DAAC Staff on 2020-05-18
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Concurrent woody and herbaceous vegetation changes between the 1982-1991 and 2004-2013 decades of the Sudano-Sahel region of Africa. (A) Map of vegetation change categories. (B) Chart showing the conceptual position and the relative abundance of each category in a 2-D space.

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Vegetation change data spanning the West African Sudano-Sahel region is now available.