Glaciers100K_DD

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Portland State University(comp.)

Publication_Date: 20051101

Publication_Time: Unknown

Title: glaciers100K_DD

Edition: 1.2

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: US Glacier Database

Issue_Identification: 1.1

Publication_Information:

Publication_Place: Portland, Oregon

Publisher: Portland State University Geology Department

Online_Linkage: <http://www.glaciers.pdx.edu/>

Larger_Work_Citation:

Citation_Information:

Series_Information:

Publication_Information:

Description:

Abstract:

This is one component of a database of glacial extent for the American West. The purpose of this project is to collect and distribute data concerning the location of and changes in glacial extent over the historic period. Glaciers are found in the states of Washington, Oregon, California, Montana, Wyoming, and Colorado, and perhaps in Nevada, Utah, and Idaho. We have three motivations for this project. First, glaciers are rapidly shrinking due to climate warming. This is true not only for the American West, but for most other regions of the world. Perhaps glaciers are the clearest expression of climate change. Second, assessment of glacier cover and its change is importance to regional stream flow and global sea level. Understanding the changes will allow us to define past contributions and estimate future effects if the glaciers recede drammatically or disappear altogether. Finally, glaciers are fascinating landforms. Under the right conditions they store information on past climates, and create lasting landforms, such as moraines that can also be used to infer past climates.

Purpose:

The purpose of this project is to collect and distribute data on the glaciers of the American West, exclusive of Alaska.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 11/01/2005

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -123.773034

East_Bounding_Coordinate: -105.628928

North_Bounding_Coordinate: 49.000088

South_Bounding_Coordinate: 37.001464

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Glaciers

Theme_Keyword: Permanent Snow

Theme_Keyword: Permanent Ice

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: US

Place_Keyword: Cascade Mountains

Place_Keyword: Olympics

Place_Keyword: Rocky Mountains

Place_Keyword: Sierra Nevada

Stratum:

Temporal:

Access_Constraints: None

Use_Constraints:

These data were compiled for public use from the USGS 1:100,000 scale digital line graphs and digital raster graphics. While there are no explicit constraints on the use of the data, please exercise appropriate judgement in the use and interpretation of these data. Public domain data from Portland State University are freely redistributable with proper metadata and source attribution.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Dr. Andrew G. Fountain

Contact_Organization: Portland State University

Contact_Position: Associate Professor

Contact_Address:

Address_Type: mailing and physical address

Address:

Department of Geology Portland State University PO Box 751

City: Portland

State_or_Province: OR

Postal_Code: 97207-0751

Country: USA

Contact_Voice_Telephone: 503.725.3386

Contact_Facsimile_Telephone: 503.725.3025

Contact_Electronic_Mail_Address: FountainA@pdx.edu

Data_Set_Credit:

We thank the US Geological Survey for supplying data and assistance. The data were compiled by Amy Ebnet, Jon Ebnet, Peter Sniffen, Thomas Nylen, Andrew Fountain, David Percy, Hassan Basagic, and Keith Jackson all of Portland State University.

Security_Information:

Security_Classification: Unclassified

Security_Handling_Description: There are no specific handling details,

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Cross_Reference:

Citation_Information:

Originator: Portland State University(comp.)

Publication_Date: Unpublished material

Publication_Time: Unknown

Title: US Glacier Database

Edition: 1.1

Geospatial_Data_Presentation_Form: map

Series_Information:

Publication_Information:

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Features identified as glaciers on USGS maps may or may not meet the criteria of an active glacier. We did not make an effort to check the orginal interpretations of the aerial photographs used to make the maps.

Logical_Consistency_Report:

This dataset is a completely faithful copy of the glacier polygons found on the 1:100,000 scale maps.. We deem it to be topologically clean, in that: chains are closed and inner rings embed within outer rings. ESRI (R) ArcView 9.0 software was used to verify.

Completeness_Report: The data set is complete.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The geospatial part of this data set was originally extracted from individual 100,000-scale Digital Line Graph (DLG) files produced by the U.S. Geological Survey which have a positional accuracy defined by the National Map accuracy Standards (NMAS). NMAS horizontal accuracy requires that at least 90 percent of points tested are within 0.02 inches of the true position. Vertex positions were verified and updated against scanned 1:100,000 quad maps (DRG), which have the same stated accuracy standards.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Vertical accuracy is dependent on published National Elevation Data, constrained by horizontal accuracy. Vertical data were compiled from 30 meter accuracy NED data.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Series_Information:

Publication_Information:

Larger_Work_Citation:

Citation_Information:

Series_Information:

Publication_Information:

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Process_Step:

Process_Description:

We obtained digitized depictions of glacier outlines from the US Geological Survey as digital line graphs (DLG) from the hydrographic layer (lakes, swamps, rivers, glaciers). The glaciers were represented by lines that outlined the extent of each glacier or snowfield.

To be sure that all the glaciers were correctly digitized from the original paper maps into DLGs, the DLG's were overlayed on digitally scanned and georeferenced paper maps, known as a 'digital raster graphic', DRG, by the US Geological Survey. Where glaciers were missing we digitized new ones, and where glaciers were indicated but were actually lakes, we deleted them. There were also errors of digization where we corrected the glacier outline by moving individual vertices or simply deleting and re-digitizing the object.

The DLG data of glacier outlines were checked for accuracy and completeness by at least two different people. The outlines were considiered "accurate" if they were within one line width of the DRG outline.

Process_Date: Unknown

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Dr. Andrew G. Fountain

Contact_Organization: Portland State University

Contact_Position: Associate Professor

Contact_Address:

Address_Type: mailing and physical address

Address: Department of Geology Portland State University PO Box 751

City: Portland

State_or_Province: OR

Postal_Code: 97201

Country: USA

Contact_Voice_Telephone: 503.725.3386

Contact_Facsimile_Telephone: 503.725.3025

Contact_Electronic_Mail_Address: FountainA@pdx.edu

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: C:\DOCUME~1\bjpd\LOCALS~1\Temp\xml20F.tmp

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 1523

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000

Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: glaciers100K_DD

Entity_Type_Definition: ???

Entity_Type_Definition_Source: ???

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: AREA

Attribute_Definition:

Area calculated in square meters in the NAD_83_Albers_Equal_Area projection

Attribute:

Attribute_Label: PERIMETER

Attribute_Definition:

Perimeter calculated in meters in the NAD_83_Albers_Equal_Area projection

Attribute:

Attribute_Label: RECNO

Attribute_Definition: Unique identifier generated by PSU

Attribute:

Attribute_Label: X_COORD

Attribute_Definition: Centroid X in Decimal Degrees

Attribute:

Attribute_Label: Y_COORD

Attribute_Definition: Centroid Y in Decimal Degrees

Attribute:

Attribute_Label: CLASSIFICA

Attribute_Definition: Description

Attribute:

Attribute_Label: SOURCE

Attribute_Definition: Agency or media of origination

Attribute:

Attribute_Label: SRC_SCALE

Attribute_Definition: Scale of feature's original mapping

Attribute:

Attribute_Label: GLACNAME

Overview_Description:

Entity_and_Attribute_Overview: The database contains outlines of glacier extents

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Andrew G. Fountain

Contact_Organization: Portland State University

Contact_Position: Associate Professor

Contact_Address:

Address_Type: mailing address

Address:

Department of Geology Portland State University P.O. Box 751

City: Portland

State_or_Province: OR

Postal_Code: 97207-0751

Country: USA

Contact_Voice_Telephone: 503-725-3386

Contact_Facsimile_Telephone: 503.725.3025

Contact_Electronic_Mail_Address: fountaina@pdx.edu

Resource_Description: ???

Distribution_Liability:

Although these data have been processed successfully on a computer system at Portland State University (PSU), no warranty expressed or implied is made by the PSU regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the PSU in the use of these data.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARCE

Format_Version_Number: 1.1

Format_Specification: ???

Format_Information_Content: ???

File_Decompression_Technique: zip

Transfer_Size: ???

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: ???

Access_Instructions: ???

Online_Computer_and_Operating_System: ???

Fees: There is no charge for the online option.

Technical_Prerequisites:

The data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS® or ArcView® 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing data. A free data viewer, arcexplorer, is available from ESRI at www.esri.com.

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Metadata_Reference_Information:

Metadata_Date: 20051130

Metadata_Review_Date: 20041004

Metadata_Future_Review_Date: 20051004

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Dr. Andrew G. Fountain

Contact_Organization: Portland State University

Contact_Position: Associate Professor

Contact_Address:

Address_Type: mailing and physical address

Address: Department of Geology Portland State University PO Box 751

City: Portland

State_or_Province: OR

Postal_Code: 97201

Country: USA

Contact_Voice_Telephone: 503.725.3386

Contact_Facsimile_Telephone: 503.725.3025

Contact_Electronic_Mail_Address: FountainA@pdx.edu

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Access_Constraints: None

Metadata_Use_Constraints: None

Metadata_Security_Information:

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile