Geospatial data for the Vegetation Mapping Inventory Project of Great Smoky Mountains National Park
공공데이터포털
The files linked to this reference are the geospatial data created as part of the completion of the baseline vegetation inventory project for the NPS park unit. Current format is ArcGIS file geodatabase but older formats may exist as shapefiles. To map the vegetation and land cover of GRSM, 52 map classes were developed. Of these 52 map classes, 46 represent natural (including ruderal) vegetation types, most of which types are recognized in the USNVC. For the remaining 6 of the 52 map classes, 4 represent USNVC cultural types for agricultural and developed areas, and 2 represent non-USNVC types for nonvegetated open water and nonvegetated rock. Features were interpreted from viewing four-band digital aerial imagery using digital onscreen three-dimensional stereoscopic workflow systems in geographic information systems; digital aerial imagery was collected during September 23–October 30, 2015. The interpreted data were digitally and spatially referenced, thus making the spatial-database layers usable in a geographic information system. Polygon units were mapped to either a 0.5- or 0.25- hectare (ha) minimum mapping unit, depending on vegetation type. A geodatabase containing several feature-class layers and tables provides the locations and data of USNVC vegetation types (vegetation map layer), vegetation plots, verification sites, AA sites, project boundary extent, and aerial image centers and flight lines. Covering 210,875 ha, the feature-class layer and related tables for the vegetation map layer provide 34,084 polygons of detailed attribute data when special modifiers are not considered (average polygon size of 6.2 ha) and 36,589 polygons of detailed attribute data when special modifiers are considered (average polygon size of 5.8 ha). Each map polygon is assigned a map-class code and name and, when applicable, are linked to USNVC classification tables within the geodatabase. The vegetation map extent includes the administrative boundary for GRSM and the Foothills Parkway.
Geospatial data for the Vegetation Mapping Inventory Project of Great Smoky Mountains National Park
공공데이터포털
The files linked to this reference are the geospatial data created as part of the completion of the baseline vegetation inventory project for the NPS park unit. Current format is ArcGIS file geodatabase but older formats may exist as shapefiles. To map the vegetation and land cover of GRSM, 52 map classes were developed. Of these 52 map classes, 46 represent natural (including ruderal) vegetation types, most of which types are recognized in the USNVC. For the remaining 6 of the 52 map classes, 4 represent USNVC cultural types for agricultural and developed areas, and 2 represent non-USNVC types for nonvegetated open water and nonvegetated rock. Features were interpreted from viewing four-band digital aerial imagery using digital onscreen three-dimensional stereoscopic workflow systems in geographic information systems; digital aerial imagery was collected during September 23–October 30, 2015. The interpreted data were digitally and spatially referenced, thus making the spatial-database layers usable in a geographic information system. Polygon units were mapped to either a 0.5- or 0.25- hectare (ha) minimum mapping unit, depending on vegetation type. A geodatabase containing several feature-class layers and tables provides the locations and data of USNVC vegetation types (vegetation map layer), vegetation plots, verification sites, AA sites, project boundary extent, and aerial image centers and flight lines. Covering 210,875 ha, the feature-class layer and related tables for the vegetation map layer provide 34,084 polygons of detailed attribute data when special modifiers are not considered (average polygon size of 6.2 ha) and 36,589 polygons of detailed attribute data when special modifiers are considered (average polygon size of 5.8 ha). Each map polygon is assigned a map-class code and name and, when applicable, are linked to USNVC classification tables within the geodatabase. The vegetation map extent includes the administrative boundary for GRSM and the Foothills Parkway.
Imagery data for the Vegetation Mapping Inventory Project of Great Smoky Mountains National Park
공공데이터포털
This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common files held here. Overstory vegetation was mapped using more than 1000 color infrared aerial photographs of 1:12,000 scale in film transparency format recorded with a Wild RC20 photogrammetric camera, f = 15 cm) in late October by the U. S. Forest Service. The fall photos were acquired when the leaves were still on the trees (leaf-on) and displayed a color diversity that allowed the vegetation communities/species to be identified. Relief displacements were a major problem, in some cases reaching more than 40 mm on the 23 x 23 cm format photographs. The understory vegetation was mapped from 1:40,000-scale color infrared photographs recorded (with a Wild RC30 camera, f = 15 cm) in the winter months as part of the USGS National Aerial Photography Program (NAPP).
Imagery data for the Vegetation Mapping Inventory Project of Great Smoky Mountains National Park
공공데이터포털
This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common files held here. Overstory vegetation was mapped using more than 1000 color infrared aerial photographs of 1:12,000 scale in film transparency format recorded with a Wild RC20 photogrammetric camera, f = 15 cm) in late October by the U. S. Forest Service. The fall photos were acquired when the leaves were still on the trees (leaf-on) and displayed a color diversity that allowed the vegetation communities/species to be identified. Relief displacements were a major problem, in some cases reaching more than 40 mm on the 23 x 23 cm format photographs. The understory vegetation was mapped from 1:40,000-scale color infrared photographs recorded (with a Wild RC30 camera, f = 15 cm) in the winter months as part of the USGS National Aerial Photography Program (NAPP).
Imagery data for the Vegetation Mapping Inventory Project of Great Smoky Mountains National Park
공공데이터포털
This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common files held here. Overstory vegetation was mapped using more than 1000 color infrared aerial photographs of 1:12,000 scale in film transparency format recorded with a Wild RC20 photogrammetric camera, f = 15 cm) in late October by the U. S. Forest Service. The fall photos were acquired when the leaves were still on the trees (leaf-on) and displayed a color diversity that allowed the vegetation communities/species to be identified. Relief displacements were a major problem, in some cases reaching more than 40 mm on the 23 x 23 cm format photographs. The understory vegetation was mapped from 1:40,000-scale color infrared photographs recorded (with a Wild RC30 camera, f = 15 cm) in the winter months as part of the USGS National Aerial Photography Program (NAPP).