R-Factor for Alaska

The rainfall-runoff erosivity factor (R-Factor) quantifies the effects of raindrop impacts and reflects the amount and rate of runoff associated with the rain. The R-factor is one of the parameters used by the Revised Unified Soil Loss Equation (RUSLE) to estimate annual rates of erosion. This product is a raster representation of R-Factor derived from isoerodent maps published in the Runoff Estimates for Small Rural Watersheds and Development of a Sound Design method. Volume II. (Fletcher et al., 1977). Lines connecting points of equal rainfall erosivity are called isoerodents. The isoerodents plotted on a map of Alaska were digitized, then values between these lines were obtained by linear interpolation. The final R-Factor data are in raster GeoTiff format at 800 meter resolution in Albers Conic Equal Area,WGS84, WGS84.

Data and Resources

Field Value
accessLevel public
accrualPeriodicity irregular
bureauCode {006:48}
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
identifier R-Factor for Alaska
language {en-US}
modified 2014-06-06
old-spatial {"type": "Polygon", "coordinates": [[[167.930127, 52.510506], [-123.346463, 52.510506], [-123.346463, 71.40623], [167.930127, 71.40623], [167.930127, 52.510506]]]}
programCode {000:000}
publisher NOAA Office for Coastal Management (Point of Contact)
resource-type Dataset
source_datajson_identifier true
source_hash 4a8fd9c0ffdfe958de7ff7de699cb836b2a8ba43
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[167.930127, 52.510506], [-123.346463, 52.510506], [-123.346463, 71.40623], [167.930127, 71.40623], [167.930127, 52.510506]]]}
temporal 1965-01-01T00:00:00/1975-01-01T00:00:00
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • alaska
  • amerigeo
  • amerigeoss
  • ckan
  • coastal-zone
  • environmental-monitoring
  • erosion
  • geo
  • geoss
  • national
  • north-america
  • r-factor
  • rainfall-runoff-erosivity
  • revised-universal-soil-loss-equation
  • rusle
  • rusle2
  • united-states
isopen False
license_id notspecified
license_title License not specified
maintainer NOAA Office for Coastal Management
maintainer_email coastal.info@noaa.gov
metadata_created 2025-11-21T17:54:48.094934
metadata_modified 2025-11-21T17:54:48.094938
notes The rainfall-runoff erosivity factor (R-Factor) quantifies the effects of raindrop impacts and reflects the amount and rate of runoff associated with the rain. The R-factor is one of the parameters used by the Revised Unified Soil Loss Equation (RUSLE) to estimate annual rates of erosion. This product is a raster representation of R-Factor derived from isoerodent maps published in the Runoff Estimates for Small Rural Watersheds and Development of a Sound Design method. Volume II. (Fletcher et al., 1977). Lines connecting points of equal rainfall erosivity are called isoerodents. The isoerodents plotted on a map of Alaska were digitized, then values between these lines were obtained by linear interpolation. The final R-Factor data are in raster GeoTiff format at 800 meter resolution in Albers Conic Equal Area,WGS84, WGS84.
num_resources 1
num_tags 17
title R-Factor for Alaska