A geodetic survey determines the precise position of permanent points on the earth's surface, taking into account the shape, size and curvature of the earth. Geodetic surveying techniques are applied when areas or distances involved are so great that desired accuracy and precision results cannot be obtained by ordinary or plane surveying. Geodetic measurements are now being done with the use of orbiting satellites that are positioned 12,500 miles above the surface of the earth.

The Field Surveys Section defines and manages a consistent coordinate system based on latitude, longitude and heights throughout Missouri. This section is responsible for preservation and augmentation of the horizontal and vertical-control network in Missouri. Electronic distance measurement equipment baselines throughout the state are used to validate and verify these instruments. The Missouri Geographic Reference System (GRS) is an extension of the National Spatial Reference System (NSRS). Currently, there are more than 13,000 of these monuments in Missouri. The technical data for these markers are available through the Land Survey Program.

EDM Baseline Documentation

An Electronic Distance Measuring (EDM) calibration will allow the operator to verify the EDM system constant and scale factor. If the EDM, Prisms, Tribrach are in calibration and the correct atmospheric corrections are applied, the results will be reflected in the returned report. If the system constant and/or the scale factor are not within the prescribed limits, the report will notify the sender. To access the information for an Electronic Distance Measuring (EDM) Calibration Baseline, click the appropriate baseline location on the map below.

The Department has changed all fill-in forms to PDF fill-in. You will be able to save and reuse these PDF forms. However, you will need Adobe Acrobat Reader 7 or higher to save the PDF fill-in form.

Land Survey Program - EDM Baselines

Missouri Land Survey Program EDM Baselines

Click to view Dexter Baseline. Click to view Pomona Baseline. Click to view Springfield Baseline. Click to view Jasper County  Baseline. Click to view Vichy Baseline. Click to view Taylor Baseline. Click to view River Valley Baseline. Click to view Cedar City Baseline. Click to view Lake City Baseline. Click to view Sqaw Creek Baseline. Click to view Kirksville Baseline.

Harn Network

Description: A HARN (High Accuracy Reference Network) is a statewide or regional upgrade in accuracy of NAD 83 coordinates using Global Positioning System (GPS) observations. HARNs were observed to support the use of GPS by Federal, state, and local surveyors, geodesists, and many other applications. The cooperative network upgrading program began in Tennessee in 1986. The last field observations were completed in Indiana in September 1997 after horizontally upgrading some 16,000 survey stations to A-order or B-order status. Horizontal A-order stations have a relative accuracy of 5 mm +/- 1:10,000,000 relative to other A-order stations. Horizontal B-order stations have a relative accuracy of 8 mm +/- 1:1,000,000 relative to other A-order and B-order stations Of these 16,000 stations, NGS has committed to maintaining about 1,400 survey stations, named the Federal Base Network, and the various states will maintain the remainder.

Status: Adjustment of the Missouri HARN was completed in March 1998

High Accuracy Reference Network.

PID Name County
LE0139 M 16 Adair
LF1452 C 342 Atchison
KC0716 MEXPORT Audrain
GF0946 CASSPORT Barry
AE5420 BR-01 Barton
AE5421 BT-02 Bates
JD0046 BOONE 2 Boone
KE15886 P 340 Buchanan
GE1106 BLUFFPORT 2 Butler
GE1108 EARLPORT AZ MK Butler
JD2573 CAMDENTON Camden
HB1837 CG-03 Cape Girardeau
JE2070 FAA MO85 A Cass
AE7149 CLN 01 Clinton
AE7150 CO 02 Cole
HC1137 POPULATION CENTER Crawford
AE7151 R E MYERS Dent
GF1009 AVAPORT AZ MK Douglas
GE1111 KENNPORT Dunklin
AC6226 FR-79 Franklin
AE2143 GE01 Gentry
HD1486 W 343 Greene
LE0607 TRENTPORT Grundy
JD2788 CLINTPORT Henry
HD0568 Y 32 Hickory
LF1464 Z 337 Holt
GE1115 PLAINPORT Howell
KE1114 W 328 Jackson
HE1218 JS 009 Jasper
JC0452 TT 11 L Jefferson
JD2822 SKYPORT Johnson
HD1521 LEBAPORT Laclede
KD1350 LEXPORT AZ MK Lafayette
GF0944 ETHRIDGE Lawrence
LD0564 L 15 Lewis
KD1334 BROOKPORT Linn
AE8203 LV-01 Livingston
AE7148 MA 04 Macon
JC1765 ROLLA NATL PORT Maries
AE8202 K52 A Monroe
JC0644 F 103 Montgomery
JD0280 SAILLES RESET Morgan
GD1176 P 274 New Madrid
GG0930 NEOPORT Newton
LF0151 C 20 Nodaway
AE3000 OR-01 Oregon
GF0018 TTS C 19 Ozark
GD1025 G 279 Pemiscot
GD1719 COTTON 2 RM 5 Pemiscot
HB1394 R 323 Perry
JD2820 SEDPORT Pettis
AE1679 LAND SURVEY BASE Phelps
AE8201 H19 A Pike
HD0859 X 22 Polk
AE2144 PT01 Putnam
KD1075 BRADLEY Randolph
AE8205 RE-06 Reynolds
AE3007 RP 05 Ripley
KD0972 MARSHALL RESET Saline
GD1904 SIKEPORT Scott
GD1905 SIKEPORT AZ MK Scott
AA8597 SC 06 St. Charles
HC1125 FARMPORT St. Francois
AA8662 SL 21 St. Louis
GD1884 DEXTPORT Stoddard
AE3009 TA-05 Taney
AE7152 TE 01 Texas
HD1412 CABOOL PORT Texas
HE0915 NEVADA AIRPORT Vernon
AE7153 WY 15 Wayne
HD1452 G 347 Webster

Horizontal Control Projects

Description: Densification of the federal network for the use of surveyors and private industry.

Mark Maintenance

Description: Destruction of survey monuments is a violation of Missouri law. The Land Survey Program will replace monuments that are in danger of being damaged or destroyed.

How to Report: Report any monuments that may be in danger of destruction to the Program at 573-368-2300.

Vertical Control Projects

Description: These projects determine the elevation of bench marks - (usually horizontal control stations) on the North American Vertical Datum 1988 (NAVD 88).

List by County: Springfield - completed 1996

Land Survey Program
Missouri Geographic Reference System Areas of Coverage

area of coverage