R-Factor for Alaska
Data Set (DS) | Office for Coastal Management (OCM)GUID: gov.noaa.nmfs.inport:48223 | Updated: February 20, 2024 | Published / External
Item Identification
| Title: | R-Factor for Alaska |
|---|---|
| Short Name: | R-Factor_metadata_for_Alaska |
| Status: | Completed |
| Publication Date: | 2014-06-06 |
| Abstract: |
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. |
| Purpose: |
These data are represented in raster format for use with the Open source Nonpoint Source Pollution and Erosion Comparison Tool (OpenNSPECT). |
| Notes: |
10839 |
| Other Citation Details: |
Fletcher, Joel E.; Huber, A. Leon; Haws, Frank W.; and Clyde, Calvin G., "Runoff Estimates for Small Rural Watersheds and Development of a Sound Design method. Volume II, Recommendations for Preparing Design Manuals and Appendices B, C, D, E, F, G, and H" (1977). Reports. P 119. |
| Supplemental Information: |
These data are derived from isoerodent maps published in Runoff Estimates for Small Rural Watersheds and Development of a Sound Design method. Volume II. (Fletcher et al., 1977). Fletcher, Joel E.; Huber, A. Leon; Haws, Frank W.; and Clyde, Calvin G., "Runoff Estimates for Small Rural Watersheds and Development of a Sound Design method. Volume II, Recommendations for Preparing Design Manuals and Appendices B, C, D, E, F, G, and H" (1977). Reports. P 119. |
Keywords
Theme Keywords
| Thesaurus | Keyword |
|---|---|
| Global Change Master Directory (GCMD) Science Keywords |
EARTH SCIENCE > AGRICULTURE > SOILS > SOIL EROSION
|
| Global Change Master Directory (GCMD) Science Keywords |
EARTH SCIENCE > LAND SURFACE > EROSION/SEDIMENTATION > EROSION
|
| Global Change Master Directory (GCMD) Science Keywords |
EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER PROCESSES/MEASUREMENTS > RUNOFF
|
| ISO 19115 Topic Category |
climatologyMeteorologyAtmosphere
|
| UNCONTROLLED | |
| None | Environmental Monitoring |
| None | Erosion |
| None | R-Factor |
| None | Rainfall-Runoff Erosivity |
| None | Revised Universal Soil Loss Equation |
| None | RUSLE |
| None | RUSLE2 |
Spatial Keywords
| Thesaurus | Keyword |
|---|---|
| Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA
|
| UNCONTROLLED | |
| None | Alaska |
| None | Coastal zone |
Physical Location
| Organization: | Office for Coastal Management |
|---|---|
| City: | Charleston |
| State/Province: | SC |
Data Set Information
| Data Set Scope Code: | Data Set |
|---|---|
| Maintenance Frequency: | None Planned |
| Data Presentation Form: | Map (digital) |
| Distribution Liability: |
Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners. |
| Data Set Credit: | Acknowledgement of the NOAA Office for Coastal Management and Fletcher et al., (1977) would be appreciated in products derived from these data. |
Support Roles
Data Steward
| Date Effective From: | 2014-06-06 |
|---|---|
| Date Effective To: | |
| Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
| Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
| Email Address: | coastal.info@noaa.gov |
| Phone: | (843) 740-1202 |
| URL: | https://coast.noaa.gov |
Distributor
| Date Effective From: | 2014-06-06 |
|---|---|
| Date Effective To: | |
| Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
| Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
| Email Address: | coastal.info@noaa.gov |
| Phone: | (843) 740-1202 |
| URL: | https://coast.noaa.gov |
Metadata Contact
| Date Effective From: | 2014-06-06 |
|---|---|
| Date Effective To: | |
| Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
| Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
| Email Address: | coastal.info@noaa.gov |
| Phone: | (843) 740-1202 |
| URL: | https://coast.noaa.gov |
Point of Contact
| Date Effective From: | 2014-06-06 |
|---|---|
| Date Effective To: | |
| Contact (Organization): | NOAA Office for Coastal Management (NOAA/OCM) |
| Address: |
2234 South Hobson Ave Charleston, SC 29405-2413 |
| Email Address: | coastal.info@noaa.gov |
| Phone: | (843) 740-1202 |
| URL: | https://coast.noaa.gov |
Extents
| Currentness Reference: | Ground Condition |
|---|
Extent Group 1
Extent Group 1 / Geographic Area 1
| W° Bound: | 167.930127 | |
|---|---|---|
| E° Bound: | -123.346463 | |
| N° Bound: | 71.40623 | |
| S° Bound: | 52.510506 |
Extent Group 1 / Time Frame 1
| Time Frame Type: | Range |
|---|---|
| Start: | 1965 |
| End: | 1975 |
Spatial Information
Spatial Representation
Representations Used
| Grid: | Yes |
|---|
Access Information
| Security Class: | Unclassified |
|---|---|
| Data Access Constraints: |
None |
| Data Use Constraints: |
None |
Distribution Information
Distribution 1
| Download URL: | https://coast.noaa.gov/data/digitalcoast/zip/R-Factor-AK.zip |
|---|---|
| Distributor: | NOAA Office for Coastal Management (NOAA/OCM) (2014-06-06 - Present) |
URLs
URL 1
| URL: | https://coast.noaa.gov/digitalcoast/tools/qnspect.html |
|---|---|
| Name: | QNSPECT |
| URL Type: |
Online Resource
|
Activity Log
Activity Log 1
| Activity Date/Time: | 2016-05-23 |
|---|---|
| Description: |
Date that the source FGDC record was last modified. |
Activity Log 2
| Activity Date/Time: | 2017-11-14 |
|---|---|
| Description: |
Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details. |
Activity Log 3
| Activity Date/Time: | 2018-02-08 |
|---|---|
| Description: |
Partial upload of Positional Accuracy fields only. |
Technical Environment
| Description: |
MapWindow GIS 8.x |
|---|
Data Quality
| Accuracy: |
The cell values in this product represent R-Factor which is an erosivity index for rainfall and runoff. The units are (hundreds ft-tonf-in)/(ac-h-yr). |
|---|---|
| Horizontal Positional Accuracy: |
This map is an approximation of spatial rainfall-runoff values |
| Vertical Positional Accuracy: |
None |
| Completeness Measure: |
Cloud Cover: 0 |
| Completeness Report: |
All pixels within Alaska boundary contain R-Factor values. |
| Conceptual Consistency: |
Tests for logical consistency indicate that all row and column positions in the selected latitude/longitude window contain data. Conversion and integration with vector files indicates that all positions are consistent with earth coordinates covering the same area. |
Lineage
Sources
R-Factor for Alaska
| Contact Name: | NOAA, National Ocean Service, Office for Coastal Management |
|---|---|
| Extent Type: | Range |
| Extent Start Date/Time: | 1965 |
| Extent End Date/Time: | 1975 |
| Scale Denominator: | 100000 |
| Source Contribution: |
Derived from isoerodent maps (Fletcher et al., 1977) | Source Geospatial Form: raster digital data | Type of Source Media: disc |
Process Steps
Process Step 1
| Description: |
The rainfall-runoff erosivity factor was estimated from the R-Factor map for Alaska given in Runoff Estimates for Small Rural Watersheds and Development of a Sound Design method. Volume II. (Fletcher et al., 1977). A line shapefile approximation of the printed map was generated via "heads-up" digitizing. The final raster map was produced using the Topo to Raster command in ESRI ArcGIS 10.x. |
|---|---|
| Process Date/Time: | 2014-01-01 00:00:00 |
Catalog Details
| Catalog Item ID: | 48223 |
|---|---|
| GUID: | gov.noaa.nmfs.inport:48223 |
| Metadata Record Created By: | Anne Ball |
| Metadata Record Created: | 2017-11-14 14:28+0000 |
| Metadata Record Last Modified By: | Brianna Key |
| Metadata Record Last Modified: | 2024-02-20 21:56+0000 |
| Metadata Record Published: | 2018-02-08 |
| Owner Org: | OCM |
| Metadata Publication Status: | Published Externally |
| Do Not Publish?: | N |
| Metadata Last Review Date: | 2018-02-08 |
| Metadata Review Frequency: | 1 Year |
| Metadata Next Review Date: | 2019-02-08 |