Mission Planning for a GPS Control Survey Using ESRI ArcMap. August 8, 2004 Mickie Warwick, PLS

Transcription

1 Mission Planning for a GPS Control Survey Using ESRI ArcMap August 8, 2004 Mickie Warwick, PLS

2 Using ArcMap for GPS Mission Planning Surveyors are not tapping into the benefits that can be derived from using GIS Many presentations aimed at bridging the gap show how survey data can be used to improve the accuracy of a GIS project This presentation will show how GIS was used to expedite a GPS Cadastral survey.

3 The Project The Project GLO notes for Pre-European Settlement ecological conditions Don Bragg, Forest Reseacher USDA Forest Service Geographic Coordinate Data Base (GCDB) Standards for the National Map and FGDC GCDB Standards for GPS Surveys

4 Standards and Guidelines for Cadastral Surveys Using Global Positioning System Methods May 9, 2001 United States Department of Agriculture Forest Service United States Department of Interior Bureau of Land Management

5 Local Accuracy Standards 95% Confidence Circle Less than 0.050m Application I. Cadastral Project Control Less than 0.100m II. Cadastral Measurements Local accuracy is a measure of the relative accuracies of the coordinates for a point with respect to adjacent points at the 95% confidence level.

6 Network Accuracy Standards 95% Confidence Circle Less than 0.100m Application I. Cadastral Project Control Less than 0.200m II. Cadastral Measurements The network accuracy shows the relationship of the cadastral survey relative to the National Spatial Reference System.

7 Standards and Guidelines for Cadastral Surveys Using Global Positioning System Methods Standards developed to provide guidance to Cadastral Surveyors in the use of carrier phase GPS technology to perform Public Land Survey System (PLSS) surveys on public lands Representatives of the U.S.D.A. Forest Service and the Bureau of Land Management jointly developed these standards and guidelines. They include other federal agencies, including the National Geodetic Survey, existing GPS control survey standards and guidelines, and opinions and reviews from other public and private land surveyors who use GPS for cadastral (boundary) surveys. Cadastral surveys are a critical part of the National Spatial Data Infrastructure. These standards and guidelines are in accordance with the accuracy reporting requirements of the Federal Geographic Data Committee's "Geospatial Positioning Accuracy Standards," July, 1997.

8 Gathering Basic Resources From the Spatial Analysis Lab at the University of Arkansas at Monticello USGS 7.5 minute quadrangle maps Color Infrared aerial photography

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13 I. Cadastral Project Control Horizontal and Vertical Control Datasheets from the National Geodetic Survey Paper copies of the datasheets for use in the field Downloaded points in GIS format for the map and to import coordinates into Resource Grade GPS for Reconnaissance

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16 Checking for overhead cover

17 Fieldwork Requirement for at least two High Accuracy Reference Network (HARN) points - easy to find because the horizontal coordinates are really good Requirement for at least one vertical control monument in each quadrant of the job preferably just outside and surrounding the project area to help define the geoid

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20 Planning the GPS Sessions Every point must be occupied at least twice with a percentage being observed three times redundancy (Cadastral Standards) Using existing or newly set monuments, the sessions are planned using GIS Computations are made to determine the number of sessions that will be necessary (Van Sickle GPS for Surveyors) The baseline vectors can be measured on the map to determine the approximate time of occupation on each point (Wolf & Ghilani Elementary Surveying textbook) Routes for each observer are determined and a schedule is made

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22 SATURDAY MARCH 6, 2004 ASHLEY COUNTY OBSERVER SESSION 1 SESSION 2 SESSION 3 SESSION 4 SESSION 5 1. Bill Gagner 3H 3V 5V 7H 1H 2 Kevin Hicks 3V 6H 6H 5V 8H 3. Jason Beck 2H 4V 8H 6V 6V 4. James Barnett 5H 5H 4V 4H 9H 5. Mickie Warwick 7H 4H 5H 9H 1V START TIME 8:00 AM 9:45 AM 11:30 AM 2:00 PM 3:45 PM STOP TIME 9:00AM 10:45 AM 12:30 PM 3:00 PM 4:45 PM

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27 II. Cadastral Measurements Data from corner cards at the State Surveyors Office Survey Plats from State Surveyors Office and County Courthouse Records at Potlatch Timber Company in Warren Records at Plum Creek Timber Company in Crossett Map from Arkansas Game and Fish Felsenthal Wildlife Management Area

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29 Tnwp Range Section Index GCDB_Code Org._Surveyor Date_Org. PLS_No. Date_Set 5W 6 A-5 05W John Clark Jan. 28, 1840 Mar. 10, W 8 J-9 05W John Clark Jan. 26, 1840 Mar. 10, W 9 G-13 05W John Clark Jan. 23, 1840 Jan. 30, W 26 R-17 05W Andrew B Clark Jan. 4,1840 Nov. 6, W 26 V-21 05W John Clark Jan. 3, 1840 Sept. 15, W 3 E-17 06W A. Bowman Jan.11, 1841 Mar. 9, W 4 E-9 06W A. Bowman Jan. 14, 1841 May. 10, W 7 G-5 06W A. Bowman Jan. 27, 1841 Sept. 20, W 10 J-17 06W A. Bowman Jan. 10, 1841 Mar. 9, W 19 R-3 06W A. Bowman Jan. 15, 1841 July. 9, W 19 R-1 06W A. Bowman Jan. 15, 1841 July. 9, W 21 R-11 06W A. Bowman Jan. 13, 1841 Mar. 9, W 2 E-21 07W A. Bowman Feb. 28, 1841 May. 10, W 22 R-17 07W A. Bowman Mar. 1, 1841 May. 10, W 25 R-25 07W A. Bowman Feb. 27, 1841 July. 9, W 27 T-17 07W A. Bowman Mar. 1, 1841 April. 30, W 34 V-17 07W A. Bowman Mar. 1, 1841 May. 10, W 35 Z-19 07W N. Rightor Jan. 8, 1828 July. 9, W 1 C-25 08W N. Rightor Dec. 24, 1827 June. 12, W 5 E-7 08W A. Bowman May. 7, 1842 April. 30, W 18 L-5 08W A. Bowman May. 6, 1842 May. 20, W 2 E-21 08W A. Bowman April. 28,1842 Nov. 26, 1986

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32 Conclusion The use of GIS significantly reduced the time it took to plan and execute a GPS survey to meet the Cadastral Standards for GPS and there was benefit added.