Metadata for Montana 2000 Population Density 1-km grid Metadata for Montana 2000 Population Density 1-km grid
Identification Information:
Citation:
Originator: Montana State Library
Publication date: 02/01/2002
Title: Montana 2000 Population Density 1-km grid
Publication place: Helena, Montana
Publisher: Montana State Library
Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Census/dens2000.zip
Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Thumbnails/20031113_601_thumb.jpg
Browse graphic file description: Thumbnail of Montana 2000 Population Density map
Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/20031113_601_2000_PopDensity.gif
Browse graphic file description: Montana 2000 Population Density map

Abstract:
Population, in persons per square mile, of Montana from the 2000 Census. This data is a smoothed-over representation of Montana's population density surface, designed to emphasize small areas with high population density. It was derived from U.S. Census Bureau 2000 TIGER files and population counts. The original data was resampled to a 100-meter grid, smoothed, and the highest resulting density of the 100-meter cells in each 1-kilometer grid cell was assigned to the cell.

When comparing this data set to the similar data sets available from the State Library for the 1990 and 2010 Census, it is important to realize that the change of population density at a location is likely to be the result of a change in the configuration of the Census Blocks rather than a change in population density. The 2000 Census Block data is available at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Census/cblock2000.zip.

Time period of content:
Calendar date: 04/01/2000
Currentness reference: Ground Condition
Status:
Progress: Complete
Maintenance and update frequency: 10 years
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, Montana 59620-1800


Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov


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Data Quality Information:
Attribute accuracy report:
Population is only known for U.S. Census Bureau Census Block areas, rather than continously, as someone might construe from this data set. The population density for a given location is a number equal to or smaller than the density of the most dense Census Block in the nearest 1000 meters. The actual population density at a given location may be much lower or higher, if the location is in an area farther from or closer to most of the people in a Census Block.

Horizontal Positional Accuracy Report:
Original data was accurate to approximately 50 meters. The horizontal resolution of this data is 1000 meters.

Lineage:
Source information:
Originator: U.S. Census Bureau
Publication date: 2000
Title: 2000 TIGER/Line Files
Edition: 2000 Census
Publication place: Washington, DC
Publisher: U.S. Census Bureau
Source scale denominator: 100000
Source contribution:
This is the source of the Census Block boundaries that were used to calculate the population density denominator.
Calendar date: 2000
Source information:
Originator: U.S. Census Bureau
Publication date: 04/01/2000
Title: Public Law 94-171 Files
Publication place: Washington, DC
Publisher: U.S. Census Bureau
Source contribution:
This is the source of the population counts per Census Block that formed the numerator of the population densities.
Calendar date: 04/01/2000

Process step:
Convert 57 Montana TIGER files to Arc/Info format, dissolve polygons to create Census Blocks, combine to form a statewide data set, and relate Census Block numbers to the Public Law 94-171 files.

Calculate population density by dividing total population by area in square miles.
Process date: 2001
Process step:
Convert vector Census Block data to 100m grid cells based on population density. Set the value of each cell to be the mean value of each cell and its 81 nearest neighbors.
Arc/Info GRID commands:
setcell 100
grid1 = polygrid (s1,density)
s2 = focalmean (grid1,rectangle,9,9)
Process date: 11/05/2001
Process step:
Assign each cell the density of the highest of the 81 nearby cells.
Arc/Info GRID command:
s3 = focalmax (s2,rectangle,9,9)
Process date: 11/05/2001
Process step:
Resample the data from 100 meter resolution to 1000.
Arc/Info GRID commands:
setcell 1000
s4 = s3
Process date: 11/18/1993
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Spatial Data Organization Information:
Raster object information:
Raster object type: Grid Cell
Row count: 530
Column count: 918
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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
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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:
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.

Standard order process:
Digital form:
Format name: GeoTiff and ESRI shapefile
megabytes
Online option:
https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Census/dens2000.zip
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Metadata Reference Information:
Metadata date: 01/06/2014
Metadata review date: 04/17/2013
Metadata review date: 09/29/2004
Metadata review date: 02/01/2001
Metadata contact:
Montana State Library
PO 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


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