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CRAMP Rapid Assessment. Watershed Factors
Terrestrial variables used in statistical analyses include human population within 5 km and 10 km of each site, human population within the adjacent watershed, total watershed area, mean annual precipitation, and perennial stream lengths. All geographic Information system layers were obtained from the State of Hawai‘i GIS database (www.state.hi.us/dbedt/gis).
Political boundaries and administrative layers include census tracts and blocks and fisheries management areas. Population data were originally five county layers downloaded from www.geographynetwork.com and merged into a single layer. The geographic extent of these 2000 census tracts and blocks covers the entire Main Hawaiian Islands (MHI).
Natural resources and environmental layers include rainfall and watersheds. The geographic extent of the watershed layer encompasses the eight MHI while rainfall contours cover the six largest Hawaiian Islands. Watershed unit boundaries were originally generated in Arc/Info and GRID using USGS Digital Elevation Model data (1995). The State Department of Land and Natural Resources served as the original source of median annual precipitation data.
Physical features and basemap layers include; coastline, hillshade, islets and perennial streams. The Commission on Water Resource Management, Hawai‘i Stream Assessment Project provided the original perennial stream data used by the state (1993).
The data projection for all layers is Universal Transverse Mercator (UTM), Zone 4 (meters), Old Hawaiian Datum. Projection conversions is applied to geographic coordinates for georeference compatibility using the ArcView extension, Hawai‘i Datums and Projections and the software program, Corpscon. Distances are calculated utilizing the Spatial Analyst version 1.1 extension for ArcView GIS version 3.1.
State GIS database showing rainfall and stream layers.
Last Update: 04/21/2008
By: Lea Hollingsworth
Hawai‘i Coral Reef Assessment & Monitoring Program
Hawai‘i Institute of Marine Biology
P.O. Box 1346
Kāne‘ohe, HI 96744
808-236-7440 phone
808-236-7443 fax
email: jokiel@hawaii.edu