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

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

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:	2023-05-30 18:09+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