Positive Openness for North Carolina by HUC8

Rasters of positive openness for the 53 hydrologic unit code (HUC) 8 watersheds in the state of North Carolina. Positive openness uses a line-of-sight approach to measure the surrounding eight zenith angles viewed above the landscape surface out to a specified distance. The central cells gets and average of the eight angles. An angle of 90 degrees would indicate a flat surface, while angles less than 90 degrees indicate a concave surface. Positive openness was calculated with the Relief Visualization Toolbox (https://iaps.zrc-sazu.si/en/rvt#v, Kokalji et al., 2011; Zakšek et al., 2011) using light detection and ranging (lidar) derived digital elevation models (DEM) with a resolution of 10 ft. (~3m). A length scale of 60 ft.(6 pixels) was used to search surrounding terrain elevations in the eight cardinal directions.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
datagov_dedupe_retained 20220721212438
identifier USGS:5b72fcf1e4b0f5d5787c5830
metadata_type geospatial
modified 20200827
old-spatial {"type": "Polygon", "coordinates": [[[-84.4222, 33.7169], [-84.4222, 36.6171], [ -75.4074, 36.6171], [ -75.4074, 33.7169], [-84.4222, 33.7169]]]}
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash a8f3fed6b706d72711659f4846854865981afcd8
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-84.4222, 33.7169], [-84.4222, 36.6171], [ -75.4074, 36.6171], [ -75.4074, 33.7169], [-84.4222, 33.7169]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • ckan
  • geo
  • geomorphology
  • geoss
  • incision
  • national
  • north-america
  • positive-openness
  • terrain-analysis
  • united-states
  • usgs-5b72fcf1e4b0f5d5787c5830
isopen False
license_id notspecified
license_title License not specified
maintainer Taylor Rowley
maintainer_email trowley@usgs.gov
metadata_created 2025-11-22T08:09:21.091420
metadata_modified 2025-11-22T08:09:21.091424
notes Rasters of positive openness for the 53 hydrologic unit code (HUC) 8 watersheds in the state of North Carolina. Positive openness uses a line-of-sight approach to measure the surrounding eight zenith angles viewed above the landscape surface out to a specified distance. The central cells gets and average of the eight angles. An angle of 90 degrees would indicate a flat surface, while angles less than 90 degrees indicate a concave surface. Positive openness was calculated with the Relief Visualization Toolbox (https://iaps.zrc-sazu.si/en/rvt#v, Kokalji et al., 2011; Zakšek et al., 2011) using light detection and ranging (lidar) derived digital elevation models (DEM) with a resolution of 10 ft. (~3m). A length scale of 60 ft.(6 pixels) was used to search surrounding terrain elevations in the eight cardinal directions.
num_resources 2
num_tags 13
title Positive Openness for North Carolina by HUC8