Metadata for Upper Clark Fork Hydrography Polygons from 1:24,000 scale U.S.G.S. quadrangles, 1989 Metadata for Upper Clark Fork Hydrography Polygons from 1:24,000 scale U.S.G.S. quadrangles, 1989

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Identification Information:

Citation:

Originator: Montana State Library

Publication date: 02/05/1992

Title:

Upper Clark Fork Hydrography Polygons from 1:24,000 scale U.S.G.S. quadrangles, 1989

Publication place: Helena, Montana
Publisher: Montana State Library

Other citation details:

The former name of this data set on the NRIS web site was "hd32"

Larger Work Citation:

Title:: GIS Layers for Clark Fork Superfund Sites, Montana, 1988-2000
Online linkage: http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={33b14155-3366-42a0-b50c-1e21d5224fe0}

Browse graphic file name: http://docs.msl.mt.gov/geoinfo/images/metadata/superfund/ClarkFork24kHydroPoly1989.gif

Abstract:

These data were formerly available from the Montana State Library web site but were removed because they are potentially out of date. Please contact the Federal Superfund Bureau of the Montana Department of Environmental Quality if you want these data so they may tell you if newer or better data are available. If the data are not available from the Department of Environmental Quality, you may request a copy from the Montana State Library data archive.

Hydrography polygons from USGS 1:24,000 scale quadrangles, Upper Clark Fork Basin, Montana.

The quadrangles have been joined into a single data set, but have not been edgematched, except to perserve polygon topology. The USGS major and minor attribute codes have been replaced with the codes shown in this metadata record.

See http://docs.msl.mt.gov/geoinfo/images/metadata/superfund/ClarkFork24kIndex1989.gif for dates of the source quadrangles.

Time period of content:

Beginning date: 1961
Ending date: 1989
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
PO Box 201800
Helena, MT 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:

Attributes were interpreted from the original DLG files by a computer program. The accuracy of this interpretation has not been extensively checked. Attribute accuracy of the original Digital Line Graph data is estimated by the USGS at 98.5 percent, and was tested by them as follows:
- manual comparison of the source with hard copy plots.
- symbolized display of the digital line graph on an interactive compter graphic system.
- Selected attributes that could not be visually verified on plots or on screen, were interactively queried and verified on screen.

In addition, U.S. Geological Survey (USGS) Production System (PROSYS) software tested the attributes against a master set of valid attributes for the category; it also checked for selected valid attribute combinations, and for valid attributes relative to topology and dimensionality. All attribute data conform to the attribute codes current as of the date of digitizing.

Completeness report:

For DLG data, Digital Revision Status = Not revised:
Data completeness reflects the content of the source quadrangle. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints.

For DLG data, Digital Revision Status = Limited Update:
This file has undergone limited update digital revision. The file contains only (1) those features that are photoidentifiable on monoscopic source, supplemented with limited ancillary source, and (2) those features, present on the original source quadrangle, that can not be reliably photoidentified but that are not considered particularly prone to change.

For DLG data, Digital Revision Status = Standard Update:
This file has undergone standard update digital revision. The data completeness of this file meets National Mapping Division standards for feature content.

Horizontal Positional Accuracy Report:

Approximate accuracy is 12 meters, assuming the source maps meet 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. The digital data are estimated to contain a horizontal

positional error of less than or equal to 0.003 inches standard error in the two component directions relative to the source quadrangle. Comparison to the graphic source is used as control to assess digital positional accuracy.

Cartographic offsets may be present on the graphic source, due to scale and legibility constraints. Digital map elements require edge alignment between data sets. Data along each quadrangle edge are tested against the data set for the adjacent quadrangle using PROSYS; tests check for positional accuracy between data sets within a 0.02 inches tolerance. Features with like dimensionality, and with or without like attribution, that are within the tolerance are adjusted by moving the feature equally in both data sets. Features outside the tolerance are not moved.

Vertical positional accuracy report:

Elevation of some polygons was read or estimated from the source quadrangles. National Map Accuracy Standards require that 90 percent of the elevations be within half the contour interval of the source maps (contour interval is usually 20 or 40 feet). For polygons with a value other than 0 for M619, the elevation is estimated.

Lineage:

Source information:

Originator:: National Mapping Division
U.S. Geological Survey
Publication date: 1961
Title: 1:24,000-scale Digital Line Graphs
Other citation details:: See http://docs.msl.mt.gov/geoinfo/images/metadata/superfund/ClarkFork24kIndex1989.gif for publication dates of the various quadrangles.
Source scale denominator: 24000
Source contribution: The data set is a re-processed copy of this source.
Beginning date: 1961
Ending date: 1989

Process step:

Interpret USGS attributes, project quadrangles to State Plane Coordinates, and join quadrangles into one data set.


Process date: 02/05/1992

Process step:

Import additional quadrangles and append to the data that was imported in 1992.


Process date: 04/14/1997

Spatial Data Organization Information:

Point and vector object information:

SDTS object type: Complete Chain

SDTS object count: 2476

SDTS object type: GT-polygon composed of chains

SDTS object count: 2031

SDTS object type: Area Point

SDTS object count: 2071

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System 1983

SPCS zone identifier: 2500

Lambert conformal conic:

Standard parallel: 45
Standard parallel: 49
Longitude of central meridian: -109.5
Latitude of projection origin: 44.25
False easting: 600000.00000
False northing: 0.00000

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

Altitude system definition:

Altitude datum name: NGVD29
Altitude resolution: 1
Altitude distance units: FEET
Altitude encoding method: Attribute values

Entity and Attribute Information:

Entity type label: LAKE.PAT

Entity type definition: Polygon Attribute Table

Attribute label: CODE

Attribute definition: Code for hydrography polygon type

Attribute label: RVIS

Attribute definition: Photorevision code

Attribute label: M619

Attribute definition: Estimated elevation code

Attribute label: ELEV

Attribute definition:

Elevation, feet
Elevation of zero indicates that elevation was not recorded.

Range domain minimum: 0

Range domain maximum: 8620

Attribute units of measure: feet

Attribute measurement resolution: 1

Attribute value accuracy information:

Attribute value accuracy: 20
Attribute value accuracy explanation:: Accuracy of 20 feet is based on National Map Accuracy Standards for maps with 40-foot contours. Some of the source maps have 20- or 80-foot contours, and the accuracy there would be 10 or 40 feet.

Distribution Information:

Distributor:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
Telephone: 406-444-5354
E-Mail: geoinfo@mt.gov
E-Mail: geoinfo@mt.gov

Resource description: Offline Data

Distribution liability:

Metadata Reference Information:

Metadata date: 02/25/2014

Metadata review date: 05/26/2010

Metadata review date: 09/29/2004

Metadata review date: 04/15/1997

Metadata review date: 07/31/1997

Metadata contact:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
E-Mail: geoinfo@mt.gov