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Short Citation:
Office for Coastal Management, 2022: R-Factor for Alaska, https://www.fisheries.noaa.gov/inport/item/48223.

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
UNCONTROLLED
ISO 19115 Topic Category climatologyMeteorologyAtmosphere
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 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

CC ID: 625506
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

CC ID: 625508
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

CC ID: 625509
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

CC ID: 625507
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

CC ID: 625512
W° Bound: 167.930127
E° Bound: -123.346463
N° Bound: 71.40623
S° Bound: 52.510506

Extent Group 1 / Time Frame 1

CC ID: 625511
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

URLs

URL 1

CC ID: 625504
URL: https://coast.noaa.gov/digitalcoast/tools/opennspect.html
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 625529
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 625528
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

CC ID: 717490
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

CC ID: 625500
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

CC ID: 625501
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

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity R-Factor map for Alaska

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: SysAdmin InPortAdmin
Metadata Record Last Modified: 2021-11-30 16:28+0000
Metadata Record Published: 2018-02-08
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-02-09