Minnesota Department of Natural Resources
Full GIS Metadata Record for: DOT Basemap Roads - All Types

Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information

SECTION 1: Identification Information

Originator: |  | Minnesota Department of Transportation, Survey and Mapping
Title: |  | DOT Basemap Roads - All Types
Unique Identifier: |  | 30000005
Abstract: |  | This data set contains roadway centerlines for roads found on the USGS 1:24,000 mapping series. Those roadways that are Interstate, Trunk Highway, or CSAH (county state/aid Highway) are current through the 2000 construction season. Other roads, if not updated, are depicted as shown on the published quadrangle.
Purpose: |  | Basemap preparation, cartographic products, registration, control
Usage Tips: |  | This coverage is intended to be a single source of data for roadways in Minnesota. It contains road information for a variety of road classes (which also exist as separate datasets).
Time Period of Content: |  | 01/01/2001
Currentness Reference: |  | The original digitization was done during the 1990-1995 time period. For any given area, Mn/DOT used the most recent USGS 7.5-minute quadrangle available at that time. This data layer was updated as recently as January 2001 using the most up-to-date available information.
Progress: |  | Complete
Maintenance Frequency: |  | Yearly
Spatial Extent of Data: |  | Statewide
Bounding Coordinates: |  | E = -89 W = -97.5 N = 49.5 S = 43
Place Keywords: |  | Minnesota
Theme Keyword: |  | Roads, MnDOT, transportation
Theme Keyword Thesaurus: |  | None
Access Constraints: |  | none
Use Constraints: |  | By accepting this data, the user agrees not to transmit this data or provide access to it or any part of it to another party unless the user shall include with the data a copy of the disclaimer. The disclaimer can be found in the distribution liability section of this document or on the back of the Mn/DOT BaseMap CD.
Contact Information: |  |
Browse Graphic File Name: |  | This field not yet implemented.
Browse Graphic File Description: |  | This field not yet implemented.
Associated Data Sets: |  | This field not yet implemented.

SECTION 2: Data Quality Information

Attribute Accuracy: |  | dotrdln3.aat: Unknown.
Logical Consistency: |  | Data have been topologically structured and verified.
Completeness: |  | Data are complete statewide, and include all road classes from residential streets to interstate highways.
Horizontal Positional Accuracy: |  | Locational accuracy for features derived from USGS 7.5-minute quadrangles cannot be assumed to exceed National Map Accuracy Standards for 1:24,000 scale maps (+/- 40 feet or 12 meters)
Vertical Positional Accuracy: |  | Not Applicable
Distance Resolution: |  | No information Available
Lineage: |  | Attribute Lineage: dotrdln3.aat: Attributes were derived from data present on MNDOT's web data distribution site located at http://rocky.dot.state.mn.us/BaseMap/. The files were downloaded by MNDNR on 8/24/2001. The data as downloaded from MNDOT were found to have inconsistencies in the attributes associated with the road features between tiles. There is a group of attributes that are documented by MNDOT which existed within each tile. However, many tiles included extraneous, undefined fields, or duplicated fields within the same table. Changes made by MNDNR include: a) Redefined original field CODE from a 2 place character field to ROAD_CLASS as a 2 character integer field. This change was made to maintain consistency with the current road data in the DNR Core Library. b) Dropped COUNTYNAME Field. This information can be derived by joining with base table of names using the COUN field. c) Redefined COUNTY_NUM field to correspond to existing department guidelines as COUN field with a 2 place integer field. d) Redefined MUNI_MCD field from a 4 place character field to a 5 place integer field and renamed to MCD_CODE in anticipation of the new municipal and township coding scheme. e) TIS_CODE - This field was dropped. It was determined to be of low value to DNR Staff and could be regenerated from the CODE,COUN,MCD_CODE, and Road_Num fields. f) GIS_ROUTE - Dropped field. g) RDWY_NAME - Dropped field. Cartographic Lineage: DOT All Road Segments: These files were derived from data present on MNDOT's web data distribution site located at http://rocky.dot.state.mn.us/BaseMap/. The files were downloaded on 8/24/2001. The road data were stored in ESRI ShapeFile format in county tiles. These files were processed by DNR with the overall goal of placing them into a county tiled Arc/Info Librarian structure. This was done so that ArcView and Arc/Info users could view the data as a seamless set of information, so that the data could be more easily managed and updated, and because historically, this is the way that the data has been stored in the GIS Core Library. The original data use is heavily based on routing and road network applications based on a mileposting structured used at MNDOT. This is accomplished in Shapefile format using a "Measured Polyline", or PolyLineM. The data measures are design a two way direction of travel defined in the ROUTE_DIR attribute. You are either traveling in increasing or decreasing milepost numbers. For roadways that are single surface, two lane multidirectional traffic there are two physical line segments for each road representation. This results in a great deal of data duplication in the files. Because Routing applications based on mileposts is not something that is done in the DNR and because Arc/Info coverages cannot contain measured polylines as a feature class, all PolyLineM features were converted to PolyLine features and for every road segment that had a duplicate line, the graphic with the ROUTE_DIR attribute of "I" was removed. This resulted in a significant decrease in the size of the resulting coverage's. In some cases, there was a 65% decrease in the file size (7 mb to 2.5 mb). The shapefiles were then converted to Arc/Info coverages, built as line feature classes, the projection was set to UTM Zone 15, Units meters, NAD83 Datum, and the fuzzy tolerance was set to 0.1. Creation Process History: Not Applicable. |
Source Scale Denominator: |  | 24000

SECTION 3: Spatial Data Organization Information

Native Data Set Environment: |  | ARC/INFO 8.x
Geographic Reference for Tabular Data: |  | none
Tiling Scheme: |  | county
Spatial Object Type: |  | line
Vendor Specific Object Types: |  | line

SECTION 4: Spatial Reference Information

Horizontal Coordinate Scheme: |  | UTM
Ellipsoid: |  | GRS1980
Horizontal Datum: |  | NAD83
Horizontal Units: |  | meters
Altitude Datum: |  | Not Applicable
Altitude Units: |  | Not Applicable
Depth Datum: |  | Not Applicable
Depth Units: |  | Not Applicable
Cell Width: |  | 0
Cell Height: |  | 0
Latitude Resolution: |  | 0
Longitude Resolution: |  | 0
UTM Zone Number: |  | 15
SPCS Zone Identifier: |  | 0
County Coordinate Zone Identifier: |  | 0
Coordinate Offsets or Adjustments: |  | Not Applicable
Map Projection Name: |  | Not Applicable
Map Projection Parameters: |  | Not Applicable
Other Coordinate System Definition: |  | Not Applicable

SECTION 5: Entity and Attribute Information

Entity and Attribute Overview: |  | Road Lines coded for road type, including interstates, U.S. trunk highways, Minnesota trunk highways, County State Aid highways, County roads, Township roads, city streets, and ramps.
Entity and Attribute Citation: |  | Information Not Available
Attribute Tables: |  | Data Table

SECTION 6: Distribution Information

Publisher: |  | null
Publication Date: |  | See Currentness Reference
Contact Person Information |  | Contact Information
Distributor Data Set Identifier: |  | dotrdln3
Distribution Liability: |  | The Minnesota Department of Transportation and the Minnesota Department of Natural Resources make no representation or warranties, express or implied, with respect to the reuse of data provided herewith, regardless of its format or the means of its transmission. There is no guarantee or representation to the user as to the accuracy, currency, suitability, or reliability of this data for any purpose. The user accepts the data 'as is', and assumes all risks associated with its use. By accepting this data, the user agrees not to transmit this data or provide access to it or any part of it to another party unless the user shall include with the data a copy of this disclaimer. The Minnesota Department of Transportation and Minnesota Department of Natural Resources assume no responsibility for actual or consequential damage incurred as a result of any user's reliance on this data.
Transfer Format Name: |  | ARC/INFO
Transfer Format Version: |  | Not Applicable
Ordering Instructions: |  | Contact above person
Online Linkage: |  | None

SECTION 7: Metadata Reference Information

Metadata Date: |  | 4/4/2001
Contact Person Information |  |
Metadata Standard Name: |  | Minnesota Geographic Metadata Guidelines
Metadata Standard Version: |  | 1.1
Metadata Standard Online Linkage: |  | http://www.lmic.state.mn.us/gc/stds/metadata.htm