20191217
11181800
1.0
ISO 19139 Metadata Implementation Specification GML3.2
TRUE
<p><span>The Prince of Wales Existing Vegetation mapping project
encompasses over 4.2 million acres of Southeastern Alaska—2.3 million of which
are terrestrial. This map was designed to be consistent with the standards
established in the Existing Vegetation Classification and Technical Guide
(Nelson et al. 2015), and to provide baseline information to support project
planning and inform land management of the Prince of Wales and surrounding
islands. The final map comprises seven distinct, integrated feature layers: 1)
vegetation type; 2) tree canopy cover; 3) trees per acre (TPA) for trees ≥ 1’
tall; 4) trees per acre for trees ≥ 6” diameter at breast height (dbh);<span> </span>5) quadratic mean diameter (QMD) for trees ≥
2” dbh; 6) quadratic mean diameter for trees ≥ 9” dbh; and 7) thematic tree
size. The dominance type map consists of 18 classes, including 15 vegetation
classes and 3 other land cover types. Continuous tree canopy cover, TPA, QMD,
and thematic tree size was developed for areas classified as <i>forest</i> on the final vegetation type map
layer. Geospatial data, including remotely sensed imagery, topographic data,
and climate information, were assembled to classify vegetation and produce the
maps. A semi-automated image segmentation process was used to develop the
modeling units (mapping polygons), which delineate homogeneous areas of land
cover. Field plots containing thematic vegetation type and tree size
information were used as reference for random forest prediction models.
Important model drivers included 30 cm orthoimagery collected during the height
of the 2019 growing season, in addition to Sentinel 2 and Landsat 8 satellite
imagery, for vegetation type prediction.<span>
</span>Additionally, detailed tree inventory data were collected at precise
field locations to develop forest metrics for Quality Level 1 (QL1) Light
Detection and Ranging (LiDAR) data. LiDAR information was acquired across
approximately 80% of the project’s land area. Continuous tree canopy cover and
2<sup>nd</sup> order forest metrics (TPA and QMD) were modeled across the LiDAR
coverage area, and subsequently, extrapolated to the full project extent using
Interferometric Synthetic Aperture Radar (IfSAR) as the primary topographic
data source. </span><o:p></o:p></p>
R10GTACUSDAUSFSPrince of Wales IslandVegetationForest ServiceForestDominance TypeTree SizeCanopy CoverMid-LevelAlaskaRegion 10Tongass National Forest
This application was created to support the Mapping Existing Vegetation on Prince of Wales Island story map.
USDA-USFS-R10-GTAC
The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.
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