Section 1 | Overview | |||
Originator | Minnesota Department of Transportation (MnDOT) | |||
Title | MnDOT Geodetic Monuments | |||
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 are 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 Spatial 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 Spatial Reference System through its State Advisor Program. | |||
Purpose | To provide geodetic control information on 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 to a GIS format. | |||
Time Period of Content Date | 1860-Present | |||
Currentness Reference | Starts with year the mark was set with history of years that the mark was adjusted and recovered. | |||
Progress | In work | |||
Maintenance and Update Frequency | Continually | |||
Spatial Extent of Data | State of Minnesota and nearby marks in surrounding states and Canada. | |||
Bounding Coordinates | -98.44 -88.60 50 41.52 | |||
Place Keywords | Minnesota, North Dakota, South Dakota, Iowa, Michigan, Wisconsin, Canada | |||
Theme Keywords | Geodetic, Horizontal Control, Vertical Control, Global Positioning System, GPS, Surveying | |||
Theme Keyword Thesaurus | None | |||
Access Constraints | Contact Distributor | |||
Use Constraints | Contact Distributor | |||
Contact Person Information | Office of Land Management,
Geodetic Unit Minnesota Department of Transportation (MnDOT) 395 John Ireland Boulevard, Mailstop 641 Saint Paul, MN 55155 Phone: Email: OLM.Geodetic.Support.DOT@state.mn.us | |||
Browse Graphic | None Available Not Applicable | |||
Associated Data Sets | ||||
Section 2 | Data Quality | |||
Attribute Accuracy | Variable | |||
Logical Consistency | None | |||
Completeness | Ongoing | |||
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 use 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 MnDOT 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, MnDOT 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, MnDOT 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, MnDOT 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. | |||
Section 3 | Spatial Data Organization (not used in this metadata) | |||
Section 4 | Coordinate System | |||
Horizontal Coordinate Scheme | Universal Transverse Mercator | |||
UTM Zone Number | 15E | |||
Horizontal Datum | NAD83 | |||
Horizontal Units | meters | |||
Section 5 | Attributes | |||
Overview | All Geodetic monuments in the database with no filters applied. | |||
Detailed Citation | OLMDB2 | |||
Table Detail: |
GDB.GEOD_STATIONS_SPATIAL_VIEW_NEW - View Designed for multiple mapping purposes and definition queries but itself being unfiltered inclusion of all Geodetic Stations. (OLMDB2) | |||
Field Name | Valid Values | Definition | Definition Source |
---|---|---|---|
MNDOT_STATION_NAME | Name assigned by MnDOT. Unique by County. | OLMDB2 | |
NGS_STATION_NAME | Name assigned by NGS. Not Unique. Legal name. | OLMDB2 | |
COUNTY | County and State abreviation of station location. | OLMDB2 | |
MAP_SHEET | 1 to 7 | County Map Sheet of station location. The same as MnDOT standard, with a few exceptions. | OLMDB2 |
NGS_ACRN | Identifier assigned by NGS. Unique. Legal Id. | OLMDB2 | |
CONDITION | Condition. | OLMDB2 | |
CONDITION_DATE | Date of last condition entry. | OLMDB2 | |
STA_AGENCY | Abreviated agency indentified on station disk or surroundings. | OLMDB2 | |
QUAD | USGS quad map relevant to the location of the station. | OLMDB2 | |
PM | 4 to 5 | PLSS prime meridian of the location of the station. | OLMDB2 |
TOWNSHIP | PLSS township of the location of the station. | OLMDB2 | |
RANGE | PLSS range of the location of the station. | OLMDB2 | |
FIRST_DIVISION | PLSS section of the location of the station. | OLMDB2 | |
SECOND_DIVISION | PLSS quadrent of the section of the location of the station. | OLMDB2 | |
STAMPING | What is stamped on the disk of the station, if available. | OLMDB2 | |
SET_DATE | Date the station was placed, most likely similar to the date on the stamping. | OLMDB2 | |
MONUMENT_TYPE | Type of monument. (what is below the ground) | OLMDB2 | |
DISK_TYPE | Type of disk for the station. (what is visabable) | OLMDB2 | |
REF_LATITUDE | Referance latitude. | OLMDB2 | |
REF_LONGITUDE | Referance longitude. | OLMDB2 | |
REF_UTM_X | Referance UTM 15E X coordinate. | OLMDB2 | |
REF_UTM_Y | Referance UTM 15E Y coordinate. | OLMDB2 | |
DATA_SHEET_PDF | URL of datasheet. | OLMDB2 | |
BRIDGE_NUMBER | Bridge number of the bridge the station is set in, if set in bridge. | OLMDB2 | |
USABLE_HORIZ | Usable for horizontal work, GPSable. | OLMDB2 | |
USABLE_VERT | Usable for vertical work, Levelable. | OLMDB2 | |
GS_ID | Geodetic Station Identifier, MnDOT unique ID for station information. MOST USED ID FIELD. | OLMDB2 | |
SM_ID | Survey Monument Identifier, MnDOT unique ID for monument information. | OLMDB2 | |
CNTY_ID | County Identification number. | OLMDB2 | |
CATEGORY | enumerated | Old category field based on highest historical Horizontal order and Verticle order. | OLMDB2 |
HARN | Horiz A,B | ||
3D | Horiz C ; Vert 1,2 | ||
HORIZ | Horiz C ; Vert NOT 1,2 | ||
VERT | Horiz NOT A,B,C ; Vert 1,2 | ||
OTHER | Horiz 3,4,NULL ; Vert 3,4,NULL : but not NULL;NULL | ||
UNPOS | Horiz NULL ; Vert NULL | ||
CATEGORY_NGVD29 | enumerated | Category field based on NGVD29 Verticle order. | OLMDB2 |
VERT | 29'Order 1,2 | ||
OTHER | 29'Order NOT 1,2,NULL | ||
UNPOS | 29'Order NULL | ||
CATEGORY_NAVD88 | enumerated | Category field based on NAVD88 Horizontal order and Verticle order. | OLMDB2 |
VERT | 88'Order 1,2 ; leveling derived | ||
OTHER | 88'Order NOT 1,2 | ||
GPS | 88'Order 1,2 ; static GPS derived | ||
UNPOS | 88'Order NULL | ||
CATEGORY_NAD83_2011 | enumerated | Category field based on NAD83 2011 Horizontal Accuracies and NAVD88 Verticle Order. | OLMDB2 |
3D | Horiz A,B,C ; Vert 1,2 | ||
HORIZ | Horiz A,B,C ; Vert NOT 1,2 | ||
VERT | Horiz NOT A,B,C ; Vert 1,2 | ||
OTHER | Horiz 3,4,NULL ; Vert 3,4,NULL : but not NULL;NULL | ||
UNPOS | Horiz NULL ; Vert NULL | ||
CATEGORY_NAD83_2007 | enumerated | Category field based on NAD83 2007 Horizontal Accuracies and NAVD88 Verticle Order. | OLMDB2 |
3D | Horiz A,B,C ; Vert 1,2 | ||
HORIZ | Horiz A,B,C ; Vert NOT 1,2 | ||
VERT | Horiz NOT A,B,C ; Vert 1,2 | ||
OTHER | Horiz 3,4,NULL ; Vert 3,4,NULL : but not NULL;NULL | ||
UNPOS | Horiz NULL ; Vert NULL | ||
CATEGORY_NAD83_1996 | enumerated | Category field based on NAD83 1996 Horizontal Accuracies and NAVD88 Verticle Order. | OLMDB2 |
HARN | Horiz A,B | ||
3D | Horiz C ; Vert 1,2 | ||
HORIZ | Horiz C ; Vert NOT 1,2 | ||
VERT | Horiz NOT A,B,C ; Vert 1,2 | ||
OTHER | Horiz 3,4,NULL ; Vert 3,4,NULL : but not NULL;NULL | ||
UNPOS | Horiz NULL ; Vert NULL | ||
CATEGORY_NAD83_1986 | enumerated | Category field based on NAD83 1996 Horizontal Accuracies/Order and NAVD88 Verticle Order. | OLMDB2 |
3D | Horiz A,B,C ; Vert 1,2 | ||
HORIZ | Horiz A,B,C ; Vert NOT 1,2 | ||
VERT | Horiz NOT A,B,C ; Vert 1,2 | ||
OTHER | Horiz 3,4,NULL ; Vert 3,4,NULL : but not NULL;NULL | ||
UNPOS | Horiz NULL ; Vert NULL | ||
CATEGORY_NAD27 | enumerated | Category field based on NAD27 Horizontal Order and NAVD29 Verticle Order. | OLMDB2 |
3D | Horiz A,B,C ; Vert 1,2 | ||
HORIZ | Horiz A,B,C ; Vert NOT 1,2 | ||
VERT | Horiz NOT A,B,C ; Vert 1,2 | ||
OTHER | Horiz 3,4,NULL ; Vert 3,4,NULL : but not NULL;NULL | ||
UNPOS | Horiz NULL ; Vert NULL | ||
VERT_ORDER_NGVD29 | NGVD29 Verticle Order. | OLMDB2 | |
VERT_ORDER_NAVD88 | NGVD29 Verticle Order. | OLMDB2 | |
HORIZ_ORDER_NAD83_2011 | NAD83 2011 adjustment, Horizontal Accuracy converted to Order. | OLMDB2 | |
HORIZ_ORDER_NAD83_2007 | NAD83 2007 adjustment, Horizontal Accuracy converted to Order. | OLMDB2 | |
HORIZ_ORDER_NAD83_1996 | NAD83 1996 adjustment, Horizontal Accuracy converted to Order. | OLMDB2 | |
HORIZ_ORDER_NAD83_1986 | NAD83 1996 adjustment, Horizontal Accuracy converted to Order. | OLMDB2 | |
HORIZ_ORDER_NAD27 | NAD27 Horizontal Order. | OLMDB2 |
Section 6 | Distribution | |||
Publisher | Minnesota Department of Transportation (MnDOT) | |||
Publication Date | periodically revised | |||
Contact Person Information | Office of Land Management,
Geodetic Unit Minnesota Department of Transportation (MnDOT) 395 John Ireland Boulevard, Mailstop 641 Saint Paul, MN 55155 Phone: Email: OLM.Geodetic.Support.DOT@state.mn.us | |||
Distributor's Data Set Identifier | Geodetic Monuments | |||
Distribution Liability | The Minnesota Department of Transportation makes 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 assumes no responsibility for actual or consequential damage incurred as a result of any user's reliance on this data. | |||
Ordering Instructions | Contact Distributor | |||
Online Linkage | I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details. | |||
Section 7 | Metadata Reference | |||
Metadata Date | 01/14/2015 | |||
Contact Person Information | Office of Land Management,
Geodetic Unit Minnesota Department of Transportation (MnDOT) 395 John Ireland Boulevard, Mailstop 641 Saint Paul, MN 55155 Phone: Email: OLM.Geodetic.Support.DOT@state.mn.us | |||
Metadata Standard Name | Minnesota Geographic Metadata Guidelines | |||
Metadata Standard Version | 1.2 | |||
Metadata Standard Online Linkage | http://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm |