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Multispectral Imagery, NDVI, and Terrain Models, north of Fairbanks, AK, 2019

Submitted by ORNL DAAC Staff on 2021-06-13
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Color infrared image of Big Trail Lake in the Goldstream Creek Valley north of Fairbanks, Alaska. Ground control points (yellow triangles) surround the lake. Image was produced from NIR (red), red (green), and green (blue).

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Very high resolution multispectral reflectance imagery, normalized difference vegetation index (NDVI), and digital surface and terrain models for a 0.5 km2 area surrounding Big Trail Lake (BTL) with soil collar locations for measuring carbon flux.

Methane Ebullition Hotspot Locations in Frozen Lakes near Fairbanks, Alaska

Submitted by ORNL DAAC Staff on 2021-06-06
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Location of 15 lakes surveyed for methane ebullition hotspots (green points) north of Fairbanks, AK, on October 8, 2014. Inset shows detail of Eagle Lake with locations of 43 hotspots (red points) detected by openings in lake ice.

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Locations and number of methane ebullition hotspots in frozen lakes in the southern portion of the Goldstream Valley and surroundings near Fairbanks, Alaska.

GEDI Level 3 Data Highlighted by NASA's Earthdata

Submitted by ORNL DAAC Staff on 2021-04-11
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The GEDI instrument onboard the ISS uses three lasers split into eight tracks that fire 242 times per second illuminating a 25-meter footprint of the Earth's surface.

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GEDI Level 3 gridded estimates of canopy height, ground elevation, and laser footprint counts from the instrument's full waveform lidar from the International Space Station. Image Credit: NASA's GSFC.

The First Campaign of NASA's Delta-X Mission is Now in Progress

Submitted by ORNL DAAC Staff on 2021-04-05
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The Channel Team's water filtering lab inside a local cabin. The team will process 800 liters of water to extract as little as ~100mg of material found in a liter of Mississippi water.

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NASA's Delta-X Mission combines airborne remote sensing and field measurements to analyze water levels, vegetation, and sediment to understand how and where the Mississippi River Delta is changing.

Daymet Version 4 Data Products highlighted by NASA's Earthdata

Submitted by ORNL DAAC Staff on 2021-01-28
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A regional view of Daymet V4 daily total precipitation over 2 days during the time period that Hurricane Harvey made landfall in August of 2017.

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Daymet Version 4's improved algorithm and sensor timing and bias corrections result in more accurate and precise data.

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).

Recent NASA Article Highlights Daymet

Submitted by ORNL DAAC Staff on 2020-05-13
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Each black dot on this digital elevation map (DEM) represents a surface weather station in continental North America providing Daymet data in 2010. Additional stations providing Daymet data are located in Puerto Rico and Hawaii.

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Daymet derived annual average of daily minimum temperature, 1980 (left) and 2019 (right), for a subset of North America. Images are scaled from -20 to +20 degrees C.

Explaining Vegetation Greening Trends in Yellowstone

Submitted by ORNL DAAC Staff on 2020-03-26
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Trends in maximum annual NDVI for natural vegetation within the Greater Yellowstone Ecosystem (GYE) from 1989 to 2014 (Emmett et al. 2019).

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Daymet and North American Carbon Program (NACP) data were used to study Normalized Difference Vegetation Index (NDVI) trends across the Greater Yellowstone Ecosystem.