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Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Spatial Info
Access Info
Distribution Info
URLs
Activity Log
Tech Environment
Data Quality
Lineage
Child Items
Catalog Details

Summary

Short Citation
Office for Coastal Management, 2024: R-Factor for Alaska, https://www.fisheries.noaa.gov/inport/item/48223.
Full Citation Examples

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.

Distribution Information

Access Constraints:

None

Use Constraints:

None

Controlled Theme Keywords

climatologyMeteorologyAtmosphere, EROSION, RUNOFF, SOIL EROSION

Child Items

Type Title
Entity R-Factor map for Alaska

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov

Extents

Geographic Area 1

167.930127° W, -123.346463° E, 71.40623° N, 52.510506° S

Time Frame 1
1965 - 1975

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

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

Distribution Information

Distribution 1

CC ID: 1326325
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

CC ID: 625504
URL: https://coast.noaa.gov/digitalcoast/tools/qnspect.html
Name: QNSPECT
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: 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