Metadata for Montana Lakes from 2000 TIGER Files Metadata for Montana Lakes from 2000 TIGER Files

Download full XML Metadata

Identification Information:

Citation:

Originator: Montana State Library
Publication date: 07/01/2003
Title: Montana Lakes from 2000 TIGER Files
Other citation details:: The former name of the data set on the NRIS web site was "tgr_lakes"
Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Shapefiles/Lakes_TIGER_2003.zip

Abstract:

Lakes selected from 2000 U.S. Census Bureau TIGER files. The lake names were enhanced using the U.S. Geological Survey Geographic Names Information System (GNIS), and the elevations were copied from the GNIS and interpolated from U.S. Geological Survey 30-meter digital elevation models.

Time period of content:

Calendar date: 2000
Currentness reference: publication date

Status:

Progress: Complete

Access constraints: None

Use constraints:

The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.

Point of contact:

Montana State Library
P.O. Box 201800
Helena, Montana 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov

Data Quality Information:

Attribute accuracy report:

Names were copied from the TIGER files and found to be inaccurate in over 1 percent of the cases where they existed. Names were copied automatically from the GNIS where the water body overlaid a GNIS point. GNIS names that were within 100 meters of a water body were copied to the nearest water body when visual inspection deemed it appropriate. There are likely many mistakes remaining in the water body names. Elevations copied from the GNIS and Digital Elevation Models have not been examined, except in cases where the two elevations for the same water body differed by over 1000 feet due to obvious blunders in the GNIS. The GNIS elevation was re-set to -9999 in these cases. The accuracy of the elevations is unknown.

Completeness report:

This is a complete representation of the lakes and reservoirs in the TIGER files. Many lakes and reservoirs listed in the GNIS do not appear in this data, probably mostly due to being too small to appear on 1:100,000 scale maps.

Horizontal Positional Accuracy Report:

Approximate horizontal accuracy is 51 meters, assuming source data meets National Map Accuracy Standards.

Lineage:

Source information:

Originator: U.S. Census Bureau
Publication date: 2000
Title: 2000 Tiger/Line Files
Edition: 2000 Redistricting
Source scale denominator: 100000
Source contribution: The data was selected and copied from the TIGER files.
Calendar date: 2000

Source information:

Originator: U.S. Geological Survey
Publication date: 1992
Title: Geographic Names Information System
Source contribution:: This is the source of the lake names and the first elevation field.
Calendar date: 1992

Source information:

Originator: U.S. Geological Survey
Publication date: 1999
Title: 30-meter Digital Elevation Models
Source contribution: This is the source of the second elevation field.
Calendar date: 1999

Process step:

The TIGER/Line files were imported into a series of ArcView shapefiles using TGR2SHP version 4.1 by GIS Tools of Knoxville, TN. This step produced water body shapefiles for each county.


Process date: 2001

Process step:

The individual county water shape files were projected to Montana State Plane Coordinates and combined into a single data set.


Process date: 2001

Process step:

All large un-named polygons were compared to lakes, reservoirs, and islands in the GNIS and were assigned names wherever possible.


Process date: 06/25/2001

Process step:

All adjacent water polygons with different names were examined and any mistakes were corrected. This happened frequently where a water body was crossed by a Census boundary line. It also happened where the Census Bureau demarked named bays and inlets from their main bodies of water. These demarcations and the names of the bays and the inlets were removed.


Process date: 06/26/2001

Process step:

All adjacent polygons with the same name were dissolved into single polygons. In cases where an un-named glacier was adjacent to an un-named lake, this step would have merged them, and this was a mistake.


Process date: 06/27/2001

Process step:

All un-named water polygons were automatically assigned the names and elevations of any lake point from the GNIS that was inside the polygon. All named polygons were assigned the elevation of the GNIS points that were inside them.


Process date: 07/02/2001

Process step:

All water polygons that fell within 500 meters of a GNIS lake were examined. Where the water polygon was un-named and a GNIS point seemed to correspond to the water polygon, the GNIS name and elevation were copied to the polygon. Where the water polygon was named differently than a GNIS point that seemed to correspond to the polygon, the GNIS name and elevation were copied to the polygon.


Process date: 07/03/2001

Process step:

The ELEV2 attribute for all lake polygons were interpolated from the digital elevation model.


Process date: 07/03/2001

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System

SPCS zone identifier: 2500

Lambert conformal conic:

Standard parallel: 45.000000
Standard parallel: 49.000000
Longitude of central meridian: -109.500000
Latitude of projection origin: 44.250000
False easting: 600000.000000
False northing: 0.000000

Planar distance units: meters

Geodetic model:

Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137
Denominator of flattening ratio: 298.257

Entity and Attribute Information:

Entity type label: Lakes_TIGER_2003.dbf

Entity type definition: polygon attribute table

Attribute label: FID

Attribute definition: Shapefile sequence Identifier

Attribute label: Shape

Attribute definition: Feature Geometry

Attribute label: NAME

Attribute definition: Name

Attribute label: ELEVATION

Attribute definition:: Elevation from GNIS, in feet. Set to -9999 if no GNIS feature corresponds to the polygon.

Attribute label: ELEV2

Attribute definition: Elevation from 30-meter DEM, in feet.

Attribute label: ACRES

Attribute definition: Area of polygon in acres

Attribute label: SQMILES

Attribute definition: Area of polygon in square miles

Attribute label: COUNTIES

Attribute definition: County or list of counties that the lake is in.

Attribute label: SUBBASINS

Attribute definition:: Name of sub-basin (4th-code hydrolgic unit), or list of sub-basins, that the lake is in.

Distribution Information:

Distributor:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov
E-Mail: geoinfo@mt.gov

Resource description: Downloadable Data

Distribution liability:

Standard order process:

Digital form:

Metadata Reference Information:

Metadata date: 01/31/2014

Metadata review date: 04/17/2013

Metadata review date: 01/23/2012

Metadata review date: 07/03/2001

Metadata contact:

Montana State Library
P.O. Box 201800
Helena, Montana 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov