USGS Home
USGS Home USGS Home
Contact USGS
Search USGS
 Alaska Geospatial Data Committee
spacer
spacer

Precipitation Map of Alaska

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Tim Brabets
Publication_Date: 1997
Publication_Time: 1200
Title: Precipitation Map of Alaska
Edition: 1
Geospatial_Data_Presentation_Form:
Series_Name Issue_Identification
Publication_Information:
Publication_Place: Anchorage
Publisher: USGS
Other_Citation_Details:
Online_Linkage: <URL:https://agdc.usgs.gov/data/usgs/water>

Description:
Abstract:

ak_precip is a polygon coverage created from a 1:2000000 scale map showing
lines of equal annual precipitation in Alaska. The precipitation map was
prepared in 1994 as part of a flood frequency study of the streams and rivers
of Alaska and was digitized into a GIS format. Precipitation values for
polygons were set to equal the average value of their bounding lines of equal
annual precipitation.

Purpose:

The original purpose of the precipitation map of Alaska was to provide precipitation values for use in computing flood peaks and their associated recurrence intervals at ungaged rivers and streams in Alaska. Realizing other uses of the precipitation map and the need for a digital product, the precipitation map was converted to a digital format.

Supplemental_Information:

Procedures_Used:

The original precipitation map was done on a 1:2,000,000 scale map of Alaska. The isolines were digitized from the mylar and entered into ARC-INFO. In ARC-EDIT, the isolines were joined with an outline of Alaska (1:250,000 scale to create the digitized precipitation map. The amount of precipitation for each polygon was determined to be the average value between bounding isolines.

Revisions:

This precipitation map of Alaska represents the most current version (1994). As more data and/or new techniques become available, the map will be updated. In 1998, there were no plans to update the map.

Reviews_Applied_to_Data:

Reviews of the digitized data were done by Emily Binnian, Stan Jones, Tim Brabets, Ben Kennedy, and Roy Glass. A review of the documentation was done by Roy Glass. Editorial review of the documentation was done Liska Snyder.

Related_Spatial_and_Tabular_Data_Sets:

None

Other_References_Cited:

Jones, S.H., and Fahl, C.B., 1994, Magnitude and frequency of floods in Alaska and conterminous basins of Canada: U.S. Geological Survey Water-Resources Investigations Report 93-4179, 122 p., 2 plates.

Notes:

None

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19970601
Beginning_Time: 1200
Ending_Date: 19970601
Ending_Time: 1200
Currentness_Reference:

None

Status:
Progress: Complete
Maintenance_and_Update_Frequency:

None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 157.54808939
East_Bounding_Coordinate: -117.38114751
North_Bounding_Coordinate: 67.56800712
South_Bounding_Coordinate: 49.12879913
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: precipitation, Alaska, AKWRD
Place:
Place_Keyword_Thesaurus: None
Place_Keyword:
Stratum:
Stratum_Keyword_Thesaurus: None
Stratum_Keyword: None
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: None
Access_Constraints:

n/a

Point_of_Contact USGS-WRD

Use_Constraints:

The precipitation map was developed using a relatively small number of precipitation stations and the map has large intervals between contours of equal annual precipitation. Thus, caution should be used when interpreting precipitation values. The original map was prepared on a 1:2,000,000 scale. Thus, scales smaller than this should be used with caution.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tim Brabets
Contact_Organization: USGS-WRD
Contact_Position: Hydrologist
Contact_Address:
Address_Type: mailing address
Address: 4230 University Drive, Suite 201
City: Anchorage
State_or_Province: AK
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7105
Contact_Facsimile_Telephone: 907-786-7150
Contact_Electronic_Mail_Address: tbrabets@usgs.gov
Hours_of_Service: 8:00 - 4:30 AST

Data_Set_Credit:

Stan Jones, Charlie Fahl, Emily Binnian, Ben Kennedy, Roy Glass.

Security_Information:
Security_Classification_System: None
Security_Classification: Unclassified
Security_Handling_Description: None
Native_Data_Set_Environment: dgux, 5.4R3.10, AViiON UNIX, ARC/INFO version 7.0.4
Cross_Reference:
Citation_Information:
Originator:
Publication_Date:
Publication_Time:
Title:
Edition:
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name:
Issue_Identification:
Publication_Information:
Publication_Place:
Publisher:
Other_Citation_Details:
Online_Linkage:


Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: See Entity_Attribute_Information
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: See Explanation
Attribute_Accuracy_Explanation:
Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.
Logical_Consistency_Report: Polygon topology present.
Completeness_Report:

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:

Unknown

Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 100 meters
Horizontal_Positional_Accuracy_Explanation: Resolution as reported
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:

Unknown

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Publication_Date:
Title:
Source_Scale_Denominator: 2000000
Type_of_Source_Media:
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:
Source_Currentness_Reference:
Source_Citation_Abbreviation:
Source_Contribution:
Process_Step:
Process_Description: TBRABETS ELIMINATE AK1_PRECIP AK_PRECIP
Source_Used_Citation_Abbreviation: None
Process_Date: 19980227
Process_Time: 0721
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: TBRABETS LABELERRORS AK_PRECIP
Source_Used_Citation_Abbreviation: None
Process_Date: 19980227
Process_Time: 0721
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: TBRABETS NODEERRORS AK_PRECIP DANGLE
Source_Used_Citation_Abbreviation: None
Process_Date: 19980227
Process_Time: 0721
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: TBRABETS DOCUMENT AK_PRECIP CREATE TBRABETS
Source_Used_Citation_Abbreviation: None
Process_Date: 19980227
Process_Time: 0807
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: TBRABETS DOCUMENT AK_PRECIP UPDATE TBRABETS
Source_Used_Citation_Abbreviation: None
Process_Date: 19980227
Process_Time: 0816
Source_Produced_Citation_Abbreviation: None
Cloud_Cover:


Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 1809
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 4724
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1810


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 55
Standard_Parallel: 55
Longitude_of_Central_Meridian: -154
Latitude_of_Projection_Origin: 50
False_Easting: 0.00000
False_Northing: 0.00000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: METERS
Geodetic_Model:
Horizontal_Datum_Name: Unknown
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98


Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: AK_PRECIP.PAT
Entity_Type_Definition: ak_precip.pat is a polygon attribute table
Entity_Type_Definition_Source: USGS-WRD
Attribute:
Attribute_Label: -
Attribute_Definition: ak_precip.pat is a polygon attribute table
Attribute_Definition_Source: USGS-WRD
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -
Enumerated_Domain_Value_Definition:
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of poly/region in square coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition:
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of poly/region in coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition:
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AK_PRECIP#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition:
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: AK_PRECIP-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer
Enumerated_Domain_Value_Definition:
Enumerated_Domain_Value_Definition_Source:
Attribute:
Attribute_Label: INCHES
Attribute_Definition: Amount of precipitation, in inches, for a given area
Attribute_Definition_Source: USGS WRIR 93-4179
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Any positive integer
Enumerated_Domain_Value_Definition:
Enumerated_Domain_Value_Definition_Source:
Overview_Description:
Entity_and_Attribute_Overview:

The standard items are included in the polygon attribute table along with one additional item: INCHES, which is the amount of annual precipitation, in inches, for a given area.

Entity_and_Attribute_Detail_Citation: Not Available


Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tim Brabets
Contact_Organization: USGS-WRD
Contact_Position: Hydrologist
Contact_Address:
Address_Type: mailing address
Address: 4230 University Drive, Suite 201
City: Anchorage
State_or_Province: AK
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7105
Contact_Facsimile_Telephone: 907-786-7150
Contact_Electronic_Mail_Address: tbrabets@usgs.gov
Hours_of_Service: 8:00 - 4:30 AST
Resource_Description: Alaska Geospatial Data Clearinghouse
Distribution_Liability: No liability is assumed
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCG ARC/INFO Generate format
Format_Version_Number: 7.0.4
File_Decompression_Technique: gzip
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <URL:https://agdcftp1.wr.usgs.gov/pub/usgs/water/ak_precip.tar.gz>
Fees: Free


Metadata_Reference_Information:
Metadata_Date: 19980227
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tim Brabets
Contact_Organization: USGS-WRD
Contact_Position: Hydrologist
Contact_Address:
Address_Type: mailing address
Address: 4230 University Drive, Suite 201
City: Anchorage
State_or_Province: AK
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7105
Contact_Facsimile_Telephone: 907-786-7150
Contact_Electronic_Mail_Address: tbrabets@usgs.gov
Hours_of_Service: 8:00 - 4:30 AST

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: Local Time
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: None


AGDC Home | Information | Datasets | Tools | Links | Contacts

Accessibility FOIA Privacy Policies and Notices

USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: https://agdc.usgs.gov/data/usgs/water/metadata/ak_precip.html
Page Contact Information: agdcweb@usgs.gov
Page Last Modified: Wednesday, 07-Dec-2016 11:58:57 AKST