Brooks Range vegetation change from repeat imagery, Alaska, 1970s to 2010s ...

This data set represents 23 study sites across 22 degrees of longitude along treeline in Alaska's Brooks Range. Each study site was approximately 50 square kilometers in area and sampled with approximately n = 3,000, randomly-placed 6 meter (m) diameter disks. Each of the 63,224 disks were clas...

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Bibliographic Details
Main Authors: Dial, Roman, Wong, Russell, Wockenfuss, Amy
Format: Dataset
Language:English
Published: NSF Arctic Data Center 2023
Subjects:
Arctic greening
treeline
forest tundra ecotone
boreal
Landsat
NDVI
shrubs
borealization
Arctic Greening
Arctic
Brooks Range
Tundra
Alaska
Online Access:https://dx.doi.org/10.18739/a2mc8rh9r
https://arcticdata.io/catalog/view/doi:10.18739/A2MC8RH9R
Description
Summary:This data set represents 23 study sites across 22 degrees of longitude along treeline in Alaska's Brooks Range. Each study site was approximately 50 square kilometers in area and sampled with approximately n = 3,000, randomly-placed 6 meter (m) diameter disks. Each of the 63,224 disks were classified by humans into coarse vegetation classes twice, once using 1970s aerial orthophotos (e.g., Alaska High-Altitude Photography) and again using 2010s very-high resolution satellite imagery (e.g., MAXAR World-View). In addition, annual maximum Landsat normalized difference vegetation index (NDVI) values were extracted from a subset of these disks (n = 27,835 from 12 study sites) for Theil-Sen regression on greening trends using the R package LandsatTS. ...

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