Public Highways, Railroads, Airports, & Utilities

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The following metadata records do not have an online linkage to the data set:

Statewide 100 Meter EPPL7/EPIC2000 Data Set - a statewide data set that consists of approximately 400 raster-formatted data layers.  It is available on a single CD-ROM in either EPPL7 or ERDAS format.  The data themes cover a wide range of physical and biological variables along with administrative, political, sociodemographic, and transportation data.  The data collection unit for most of the variables is the 40-acre parcel.  Files have been subdivided into 100-meter by 100-meter grid cells and spatially corrected to provide improved geographic reference.  However, this processing step does not improve the original 40-acre resolution accuracy.  The data set is designed for use in regional and statewide planning, not for site-specific decision making.  This dataset is effectively the MLMIS100 county data set appended into a statewide coverage.  There is also a Twin Cities Metropolitan Area 30-meter EPPL&/EPIC2000 Data Set.

The following are examples of transportation data layers included in the statewide data set: 

Interstate highways (line data)
Proximity to highways
State highways (U.S. Geological Survey, line data) 

State of Minnesota BaseMap '98 - The State of Minnesota BaseMap '98 consists of a number of individual data layers or themes digitized from USGS 7.5-minute quadrangles.  These data layers fall into the following broad categories:  Transportation System, Civil and Political Boundaries, and Surface Water.  A brief description of each BaseMap data layer is included in Section 5 of the metadata record - Entity and Attribute Overview.  The following Transportation System data layers are included in BaseMap '98:  Trunk Highway System, Ramps, County State-Aid Highways, County Roads, Township Roads, City Streets, Railroads, Airport Runways. 
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The following data sets cover the Twin Cities Metropolitan Area only.  These metadata records have an online linkage to the data set:

Airports - This layer attempts to depict approximate airport ownership boundaries, (not the area actually used for the airport) for the Twin Cities metropolitan area.  For example, MSP includes an area that is a golf course.  Also, as of 3/3/97, boundaries are not up-to-date for MSP, Airlake, Flying Cloud and Anoka County/Blaine. 

Functional Class Roads - The functional class roads layer contains major roads and highways in the Twin Cities seven county metropolitan area.  The line work for the data set was derived in part from 1992 digital roads data developed by the Minnesota Department of Transportation and possibly from other undocumented sources. 

Major Highways - This layer contains single lines representing the major highways in the Twin Cities metropolitan area.  The lines are derived from the Functional Class Roads layer (also developed by the Metropolitan Council).  Attributes include road names and a code defining interstate highways (Y/N). 

The following data sets cover the Twin Cities Metropolitan Area only.  These metadata records do not have an online linkage to the data set:

TLG Street Centerline and Address Ranges - This street centerline and address range data set for the Twin Cities Metropolitan Area includes the nine counties of Anoka, Carver, Dakota, Hennepin, Ramsey, Scott, Washington, Chisago and Isanti.  Additional related data sets provided with the street centerline data include landmark information such as schools, shopping centers, hospitals, cemeteries, lakes, streams, railroads and various other areas and points of interest. 
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Other Information Resources

Digital Line Graphs (DLGs)
U.S. Geological Survey (USGS) Digital Line Graph (DLG) data are digital representations of cartographic information.  DLGs of map features are converted to digital form from maps and related sources. Intermediate-scale DLG data are derived from USGS 1:100,000-scale 30- by 60-minute quadrangle maps.  Intermediate-scale DLGs are sold in five categories: (1) Public Land Survey System, (2) boundaries, (3) transportation, (4) hydrography, and (5) hypsography.  Large-scale DLG data are derived from USGS 1:20,000-, 1:24,000-, and 1:25,000-scale topographic quadrangle maps.  Large-scale DLGs are sold in nine categories: (1) hypsography, (2) hydrography, (3) vegetative surface cover, (4) non-vegetative features, (5) boundaries, (6) survey control and markers, (7) transportation; (8) manmade features, and (9) Public Land Survey System.  All DLG data distributed by the USGS are DLG-Level 3 (DLG-3), which means the data contain a full range of attribute codes, have full topological structuring, and have passed certain quality-control checks.  DLG data can be ordered by contacting the Rolla-Earth Science Information Center (ESIC), 573-308-3500 or 1-888-ASK-USGS.  For more information about DLGs, refer to the DLG User Guide. 

The Minnesota Land Management Information Center (LMIC) has converted the 1:100,000-scale DLG transportation data to ARC/INFO format and edge-matched the original files.  The data set may be ordered by contacting (LMIC), 651-296-1211.  The file unit is 30 minutes latitude by 60 minutes longitude and the cost is $95 for the first unit; $15 for each additional unit. 

Digital Raster Graphics (DRGs)
Digital Raster Graphics (DRGs) are scanned images of published U.S. Geological Survey (USGS) 1:24,000-, 1:100,000-, and 1:250,000-scale maps.  Each file consists of a full color 250 dpi raster file in GeoTIFF format and includes all legend information printed along the margins of the map.  The USGS distributes DRGs on CD-R and can be ordered by contacting the Rolla-Earth Science Information Center (ESIC), 573-308-3500 or 1-888-ASK-USGS.  For more information about DRGs, refer to the following:  Base Maps for the 1990s - DRGs, DRG Fact Sheet, and DRG User Guide - draft. 

TIGER/Line Files
The term TIGER (Topologically Integrated Geographic Encoding and Referencing) is the name for the system and digital database developed at the U.S. Census Bureau to support its mapping needs for the Decennial Census and other Bureau programs.  A TIGER/Line file is a single layer that contains lines for all census data collection areas.  Lines are assigned codes that indicate the type of boundary or boundaries they represent and the type of feature they portray (roads, railroads, rivers, lakes).  For example, a single line could be coded as a county and census tract boundary, and also as a river.  Using these line codes, GIS users can select features they want to analyze.  The census distributes the TIGER/Line files and publishes on-line technical documentation that explains format and translates codes.  Although line files can be complicated, they are sometimes the only source for geocode address information.  Note: Many areas, particularly rural parts of the state, do not have complete address information.  TIGER/Line files may be ordered via the TIGER Page, or by contacting the U.S. Census Bureau Customer Services Office, 301-457-4100. 

The Minnesota Land Management Information Center (LMIC) distributes a version of the TIGER/Line data set in ARC/INFO format that includes 1992 file updates and corrections, primarily additional address range information.  The U.S. Census Bureau has prepared more recent updates, but these have not been incorporated into LMIC files.  This data set can be ordered by contacting LMIC, 651-296-1211.  The file unit is by county and the price is $95 for the first unit; $15 for each additional unit.
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