DAAC Home > Resources > News

News

Updated GEDI L4A AGBD Estimates Released

Submitted by ORNL DAAC Staff on 2022-03-22
Image Media
Image Media
Caption

Example subset of aboveground biomass density (AGBD; Mg ha-1) predictions from the GEDI Level-4A footprint version 2.1 product over Northern California, USA, spanning April to July 2019. GEDI footprints are spaced 60m along track and 600m across-track.

Body
Global Ecosystem Dynamics Investigation (GEDI) L4A Footprint Level Aboveground Biomass Density Version 2.1 now available.

Lake & Wetland Classification, Alaska & Canada, 2017-2019

Submitted by ORNL DAAC Staff on 2022-03-22
Image Media
Image Media
Caption

Figure 1. A preliminary wetland classification for Canadian Shield lakes north of Yellowknife, NWT, Canada. Missing data in some lakes appear as white spots

Body
High-resolution land cover classification focused on water and wetland vegetation classes over three NASA ABoVE Campaign regions.
Tags

Dr. Kevin Schaefer

Submitted by ORNL DAAC Staff on 2022-03-22
Image Media
Image Media
Caption

Dr. Kevin Schaefer, Measures a survey location with a high-precision GPS unit near Fairbanks, Alaska in 2018. Image Credit: Roger Michaelides

Body
Dr. Schaefer studies permafrost, believed to be the sleeping giant of climate change.
Tags

PhotoSpec Products, 2019 & 2020 Spring Transition Season

Submitted by ORNL DAAC Staff on 2022-03-09
Image Media
Image Media
Caption

Diagram of the field set-up. This dataset provides the products collected using PhotoSpec mounted at the top of the tower. Measurements collected from other instrumentation shown are not provided in this dataset. Source: Pierrat et al., 2021

Body
Daily averaged SIF, relative SIF, and chlorophyll-carotenoid index, as well as three more variables for both black spruce and larch targets.
Tags

WRF-STILT L4 Footprints and Particle Trajectories, 2016-2019

Submitted by ORNL DAAC Staff on 2022-03-09
Image Media
Image Media
Caption

Subset of STILT footprint domain showing contributions overlain by HYSPLIT trajectories from receptors located at 100 (solid), 500 (dashed), and 1,000 m (dotted) at 19:35 UTC 2012-08-20.

Body
WRF STILT Footprint data products and particle trajectories at circumpolar locations in northern latitudes during 2016-2019.
Tags

GEDI L4A Version 2 AGBD Estimates

Submitted by ORNL DAAC Staff on 2022-03-02
Image Media
Image Media
Caption

Example subset of aboveground biomass density (AGBD; Mg ha-1) predictions from the GEDI Level-4A footprint product over Northern California, U.S., spanning April to July 2019. GEDI footprints are spaced 60m along-track and 600m across-track.

Body
Estimates of AGBD generated by algorithm setting group 10 affecting ~3% of the good quality footprints are now being updated.

ABoVE: Angular-corrected MODIS MAIAC Reflectance

Submitted by ORNL DAAC Staff on 2022-03-01
Image Media
Image Media
Caption

MAIAC tiles (blue squares with yellow labels) and ABoVE core (red) and extended (purple) domain boundaries covering Alaska and western Canada. Source: adapted from Yu et al. 2021

Body
Angular corrections of MODIS MAIAC surface reflectances across the ABoVE domain in Alaska and western Canada from 2000 to 2017.
Tags

ABoVE: Methane Fluxes at Big Trail Lake, Alaska, 2019

Submitted by ORNL DAAC Staff on 2022-03-01
Image Media
Image Media
Caption

Chambers used to measure diffusive CH4 fluxes. a) Large chamber resting on the pre-installed aluminum collar, sealed on edges with pipe insulation. b) Five-gallon (18.9-liter) bucket with an open bottom and air-tight screw lid to measure hotspot flux locations.

Body
Methane fluxes from hot-spot and non-hot spot differing surfaces at Big Trail Lake near Fairbanks, AK, USA in 2019.
Tags