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This page last updated: 08/21/2007
Metadata created using Minnesota Geographic Metadata Guidelines
| Originator | Minnesota Department of Transportation (Mn/DOT) |
| Abstract | The Geodetic Database contains information on permanent geodetic control marks located in Minnesota or just outside its boundaries. Permanent geodetic control marks are established for the purpose of providing precise horizontal and vertical control positions for the registration of surveying and mapping activities in the local area. Information about the location of an object based on its geodetic location locates that object in a worldwide geographic information system. The marks have unique identification and year established stamped on the monument disk, usually an 89 mm (3.5 inch) diameter brass or aluminum disk. Monuments consist of material (concrete or metal) that is meant to stay in place for 50 to 100 years or more, and have little or no movement due to frost action or activity near the monument. The marks have been established by all levels of government in Minnesota, and they are referenced to the National Geodetic Reference System (NAD 1927, NAD 1983, NGVD 1929, and NAVD 1988). The Federal Government supports monumentation at the state level by providing technical expertise, adjustments of the data, and maintenance of the National Geodetic Reference System through its State Advisor Program. |
| Browse Graphic | none available |
| Time Period of Content Date | 1998 |
| Currentness Reference | Starts with the year the mark was set with history of years that the mark was adjusted and recovered. |
| Access Constraints | Contact Distributor |
| Use Constraints | Contact Distributor |
| Distributor Organization | Minnesota Department of Transportation, Office of Land Management |
| Ordering Instructions | Go to 'Online Linkage' to access the Geodetic Database. Use the Geodetic Database to view or download County Data Sheets, County Map Sheets, County Index Sheets, and Station Photos. For further information, contact distributor. |
| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" in Section 6 of this metadata. |
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 | Top of page | ||
| Originator | Minnesota Department of Transportation (Mn/DOT) | |||
| Title | Geodetic Database: Minnesota Department of Transportation (Mn/DOT) | |||
| Abstract | The Geodetic Database contains information on permanent geodetic control marks located in Minnesota or just outside its boundaries. Permanent geodetic control marks are established for the purpose of providing precise horizontal and vertical control positions for the registration of surveying and mapping activities in the local area. Information about the location of an object based on its geodetic location locates that object in a worldwide geographic information system. The marks have unique identification and year established stamped on the monument disk, usually an 89 mm (3.5 inch) diameter brass or aluminum disk. Monuments consist of material (concrete or metal) that is meant to stay in place for 50 to 100 years or more, and have little or no movement due to frost action or activity near the monument. The marks have been established by all levels of government in Minnesota, and they are referenced to the National Geodetic Reference System (NAD 1927, NAD 1983, NGVD 1929, and NAVD 1988). The Federal Government supports monumentation at the state level by providing technical expertise, adjustments of the data, and maintenance of the National Geodetic Reference System through its State Advisor Program. | |||
| Purpose | To provide geodetic control information in an electronic medium that will allow convenient data access, modification, and distribution. The data stored in the database allows the user to: 1. Create reports on all geodetic control monuments that reside in a specified area (by county, by township, range, or section, by Latitude and Longitude, etc.) 2. Create a computer file of geodetic control mark data 3. Create a file for input in a GIS format |
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| Time Period of Content Date | 1998 | |||
| Currentness Reference | Starts with the year the mark was set with history of years that the mark was adjusted and recovered. | |||
| Progress | Complete | |||
| Maintenance and Update Frequency | Continuously, mark by mark | |||
| Spatial Extent of Data | Minnesota | |||
| Bounding Coordinates | -97.25 -89.48 49.40 43.50 |
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| Place Keywords | Minnesota | |||
| Theme Keywords | location, Geodetic, Horizontal Control, Vertical Control, Global Positioning System, GPS, Surveying | |||
| Theme Keyword Thesaurus | ISO 19115 Topic Category | |||
| Access Constraints | Contact Distributor | |||
| Use Constraints | Contact Distributor | |||
| Contact Person Information | John Barke,
Geodetic Engineer Minnesota Department of Transportation, Office of Land Management 395 John Ireland Boulevard, Mailstop 641 St. Paul, MN 55155-1899 Phone: 651-296-8804 FAX: 651-297-1518 E-mail: john.barke@dot.state.mn.us | |||
| Browse Graphic | none available | |||
| Browse Graphic File Description | Not applicable | |||
| Associated Data Sets | Minnesota Public Land Survey System Control Point Inventory |
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| Section 2 | Data Quality Information | Top of full metadata | Top of page | |
| Attribute Accuracy | Not applicable | |||
| Logical Consistency | Not applicable | |||
| Completeness | State of Minnesota is complete. However, not all control marks in the geodetic database have precise horizontal and vertical positions but nearly all have one or the other. Precise horizontal positions are displayed in three forms: 1. Latitude and Longitude on a spherical coordinate system based on NAD 27 and/or NAD 83 Datums.The NAD 83 has had two adjustments, in 1986 and 1996 and is denoted by NAD 83 (1986) and NAD 83 (1996). 2. X and Y plane coordinates on the Minnesota State Plane Coordinate System, South, Central, or North Zones, based on NAD 27 and/or NAD 83 Datums. 3. X and Y plane coordinates on the Minnesota County Coordinate System based on NAD 83 Datum only. 4. X and Y plane coordinates on the UTM Coordinate System, Zone 15 All elevations are displayed as the mark's height above mean sea level for both the NGVD 29 and the NAVD 88 Datum. |
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| Horizontal Positional Accuracy | Varies from +/- 3 seconds to +/- .00001 seconds (100 meters to .001 meter) Latitude/Longitude. The accuracy of each individual horizontal station can be derived from the number of significant digits. | |||
| Vertical Positional Accuracy | Varies from +/- 3 meters to +/- .001 meter. The accuracy of each individual vertical station can be derived from the Method field in the database. | |||
| Lineage | HISTORY OF THE GEODETIC DATABASE: The need for a Geodetic Database available to the local surveying and mapping community has been identified at many levels of local government. Increased uses of the Global Positioning System (GPS) for positioning objects or monuments has generated more requests for geodetic control information. Access to geodetic control information for all levels of government and the private sector fosters a common locational reference system and acceptable accuracy standards for all levels of GIS/LIS activities. The Mn/DOT Geodetic Unit recognized this need in the early Seventies, and work was started to automate the information then. Computer formatting of this data took place in stages over the past twenty years. The new horizontal datum (NAD 83) was made available in August, 1986, and the new vertical datum (NAVD 88) became available in November, 1991. With the introduction of the new horizontal datum, Mn/DOT provided a ground coordinate system (County Coordinates) that allows the user to compute and map using horizontal ground distances. The Minnesota High Accuracy Reference Network (HARN) observations resulted in a readjustment of the geodetic network based on the NAD 83 Datum. The HARN observations completed during the period of 1993-1996 using high precision GPS techniques, were adjusted by the National Geodetic Survey in December, 1996. After the observations were adjusted for the HARN, the entire geodetic network in Minnesota will be readjusted, holding the HARN stations fixed. The shifts of the NAD 83 (1986) adjustment compared to the NAD 83 (1996) HARN adjustment are relatively small for mapping purposes (+/- 0.03 ~ 0.70 meters) but significant for geodetic surveys. The source scale is 1:24000 (USGS Quadrangle map) for scaled Latitudes and Longitudes of vertical control marks that have not been positioned by a horizontal control survey. In January 2002, Mn/DOT began Federal Base Network (FBN) observations. The FBN provides spatial reference control that has some of the most precise accuracies available. FBN observations concluded in February 2002. This survey consisted of 54 stations on a 100 km grid spacing. In January 2004, Mn/DOT began the Cooperative Base Network (CBN) observations. This survey consisted of 454 stations on a 25 km spacing. Phase 1 observations concluded in May 2004. These observations included stations in Districts 1 and 2. Phase 2 observations began in October 2004 and concluded in May 2005. These observations included stations in Districts 3,4,6,7,8 and Metro Division. |
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| Source Scale Denominator | 24000 | |||
| Section 3 | Spatial Data Organization Information | Top of full metadata | Top of page | |
| Native Data Set Environment | Data Ease | |||
| Geographic Reference for Tabular Data | Latitude, Longitude, State Plane X and Y, County X and Y, UTM_X and UTM_Y | |||
| Spatial Object Type | ||||
| Vendor Specific Object Types | Not applicable | |||
| Tiling Scheme | None | |||
| Section 4 | Spatial Reference Information | Top of full metadata | Top of page | |
| Horizontal Coordinate Scheme | ||||
| Ellipsoid | Not applicable | |||
| Horizontal Datum | ||||
| Horizontal Units | Not applicable | |||
| Distance Resolution | ||||
| Altitude Datum | Not applicable | |||
| Altitude Units | Not applicable | |||
| Depth Datum | Not applicable | |||
| Depth Units | Not applicable | |||
| Coordinate Offsets or Adjustments | Not applicable | |||
| Section 5 | Entity and Attribute Information | Top of full metadata | Top of page | |
| Entity and Attribute Overview | All of the information contained in the database for each of the control marks will presently fit on an 8.5 x 11 inch page. The Geodetic Database consists of the following fields: STATION NAME: Designation of the control mark. This is normally the same name that is stamped on the survey monument disk, except for MNDT horizontal marks. NGS QUAD: NGS 7.5-minute quadrangle designation STA#: 4-digit station number for horizontal geodetic control marks that are published as part of the National Geodetic Reference System COUNTY: Name of the county that the control mark is located in MAP SHT: County Highway Map Sheet Number for the mark's location in the County INDEX: Control Mark Index Number (for marks with vertical control) that is displayed next to the mark symbol or name on the map sheet NGS ACRN#: Unique NGS Archival Cross Reference Number which links the Mn/DOT Geodetic Database Record to the NGS Database 1/4: PLS quarter section SEC: PLS section TWP: PLS township RNG: PLS range LATITUDE: Approximate latitude of the mark for purposes of searching the database by LAT/LONG or for displaying on a map LONGITUDE: Approximate longitude of the mark for purposes of searching the database by LAT/LONG or for displaying on a map GPS: Choice field. The $ sign indicates that the mark has been occupied and measured by GPS precise positioning equipment. H indicates that the mark is High Accuracy Reference Network (HARN) station. USGS QUAD MAP: Name of the 7.5-minute USGS Quadrangle Map that the mark is located in AGENCY: Initials of the government agency that established the mark YR-SET: The year that the mark was set YR-REC: Most recent year that the control mark was recovered COND: The condition of the monument at the time of last recovery PHYS: Physical description of the monument material or structure BRDG#: The Mn/DOT Bridge Number for those marks located on a bridge structure _ _ _ _: Year that the mark's description was written or updated STAMPING: The stamping on the actual monument disk or access cover. It does not include the die-cast text. DESCRIPTION: An abbreviated description of the mark's location NGVD 29: The National Geodetic Vertical Datum 1929 elevation of the mark NAVD 88: The North American Vertical Datum 1988 elevation of the mark ELLIPSOID HEIGHT: The geometrical height of a point above a referenced ellipsoid measured along the normal of the referenced surface ORDER: The order of the vertical control survey (1st, 2nd, and 3rd) that established the precise elevation of the mark. METHOD: The method of survey measurement used to compute the elevation YEAR: The year of the adjustment REFERENCE: The source of the elevation displayed GEOID 96 HEIGHT: The difference between the surface of a reference ellipsoid and the geoid. In Minnesota, the geoidal surface is below the ellipsoidal surface, therefore, the height value is negative. MN ST. PLANE ZONE: The State Plane Coordinate Zone (South, Central, or North) in which the mark is located SPECIAL COUNTY ZONE: The special county zone in which the mark is located ST PLANE NAD 27: X COORDINATE ST PLANE NAD 27: Y COORDINATE NAD 27: LATITUDE NAD 27: LONGITUDE YEAR: The year of the adjustment REFERENCE: The source of the adjustment for the precise position ST PLANE NAD 83 (1986): X COORDINATE ST PLANE NAD 83 (1986): Y COORDINATE NAD 83 (1986): LATITUDE NAD 83 (1986): LONGITUDE YEAR: The year of adjustment REFERENCE: The source of the adjustment for the precise position COUNTY: X COORDINATE - based on NAD 83 (1986) COUNTY: Y COORDINATE - based on NAD 83 (1986) Free space to allow for comments, etc., pertaining to the coordinates that are displayed ST PLANE NAD 83 (1996): X COORDINATE - based on the HARN adjustment for Minnesota ST PLANE NAD 83 (1996): Y COORDINATE - based on the HARN adjustment for Minnesota NAD 83 (1996): LATITUDE - based on the HARN adjustment for Minnesota NAD 83 (1996): LONGITUDE - based on the HARN adjustment for Minnesota YEAR: The year of the adjustment REFERENCE: The source of the adjustment for the precise position COUNTY: X COORDINATE - based on NAD 83 (1996) and the HARN adjustment for Minnesota COUNTY: Y COORDINATE - based on NAD 83 (1996) and the HARN adjustment for Minnesota Free space to allow for comments, etc., pertaining to the coordinates that are displayed Date of original entry Last entry or modification of the record in the Database The database user name of the person who made the most recent modification of the record in the database |
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| Entity and Attribute Detailed Citation | Mn/DOT Geodetic Unit, Database Documentation, 2000; http://www.olmweb.dot.state.mn.us/geodetic/2000database.pdf | |||
| Section 6 | Distribution Information | Top of full metadata | Top of page | |
| Publisher | Minnesota Department of Transportation (Mn/DOT) | |||
| Publication Date | Unknown | |||
| Contact Person Information | John Barke Geodetic Engineer Minnesota Department of Transportation, Office of Land Management 395 John Ireland Boulevard, Mailstop 641 St. Paul, MN 55155-1899 Phone: 651-296-8804 FAX: 651-297-1518 E-mail: john.barke@dot.state.mn.us |
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| Distributor's Data Set Identifier | geodetic | |||
| Distribution Liability | None | |||
| Transfer Format Name | ||||
| Transfer Format Version Number | ||||
| Transfer Size | ||||
| Ordering Instructions | Go to 'Online Linkage' to access the Geodetic Database. Use the Geodetic Database to view or download County Data Sheets, County Map Sheets, County Index Sheets, and Station Photos. For further information, contact distributor. | |||
| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" above. | |||
| Section 7 | Metadata Reference Information | Top of full metadata | Top of page | |
| Metadata Date | 08/21/2007 | |||
| Contact Person Information | Chacko Jacob,
Research Analyst Intermediate Minnesota Department of Transportation 395 John Ireland Boulevard St. Paul, MN 55155-1899 Phone: 651-284-3241 FAX: E-mail: chacko.jacob@dot.state.mn.us |
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| Metadata Standard Name | Minnesota Geographic Metadata Guidelines | |||
| Metadata Standard Version | 1.2 | |||
| Metadata Standard Online Linkage | http://www.lmic.state.mn.us/gc/stds/metadata.htm | |||
This page last updated: 08/21/2007