Next Article in Journal
Dimension Reduction of Multi-Spectral Satellite Image Time Series to Improve Deforestation Monitoring
Next Article in Special Issue
The Geometry of Large Tundra Lakes Observed in Historical Maps and Satellite Images
Previous Article in Journal / Special Issue
Comparison of Gas Emission Crater Geomorphodynamics on Yamal and Gydan Peninsulas (Russia), Based on Repeat Very-High-Resolution Stereopairs
Open AccessArticle

Regional Quantitative Cover Mapping of Tundra Plant Functional Types in Arctic Alaska

1
ABR, Inc.—Environmental Research & Services, P.O. Box 80410, Fairbanks, AK 99708, USA
2
University of Maine—Fort Kent, 23 University Dr., Ft. Kent, ME 04743, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2017, 9(10), 1024; https://doi.org/10.3390/rs9101024
Received: 17 August 2017 / Revised: 26 September 2017 / Accepted: 29 September 2017 / Published: 4 October 2017
(This article belongs to the Special Issue Remote Sensing of Arctic Tundra)
Ecosystem maps are foundational tools that support multi-disciplinary study design and applications including wildlife habitat assessment, monitoring and Earth-system modeling. Here, we present continuous-field cover maps for tundra plant functional types (PFTs) across ~125,000 km2 of Alaska’s North Slope at 30-m resolution. To develop maps, we collected a field-based training dataset using a point-intercept sampling method at 225 plots spanning bioclimatic and geomorphic gradients. We stratified vegetation by nine PFTs (e.g., low deciduous shrub, dwarf evergreen shrub, sedge, lichen) and summarized measurements of the PFTs, open water, bare ground and litter using the cover metrics total cover (areal cover including the understory) and top cover (uppermost canopy or ground cover). We then developed 73 spectral predictors derived from Landsat satellite observations (surface reflectance composites for ~15-day periods from May–August) and five gridded environmental predictors (e.g., summer temperature, climatological snow-free date) to model cover of PFTs using the random forest data-mining algorithm. Model performance tended to be best for canopy-forming PFTs, particularly deciduous shrubs. Our assessment of predictor importance indicated that models for low-statured PFTs were improved through the use of seasonal composites from early and late in the growing season, particularly when similar PFTs were aggregated together (e.g., total deciduous shrub, herbaceous). Continuous-field maps have many advantages over traditional thematic maps, and the methods described here are well-suited to support periodic map updates in tandem with future field and Landsat observations. View Full-Text
Keywords: plant functional types; Arctic tundra; vegetation mapping; random forest; phenology; reflectance composites; Landsat; North Slope; Alaska plant functional types; Arctic tundra; vegetation mapping; random forest; phenology; reflectance composites; Landsat; North Slope; Alaska
Show Figures

Graphical abstract

MDPI and ACS Style

Macander, M.J.; Frost, G.V.; Nelson, P.R.; Swingley, C.S. Regional Quantitative Cover Mapping of Tundra Plant Functional Types in Arctic Alaska. Remote Sens. 2017, 9, 1024.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop