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The "Georgia Geodetic Survey" 2 L. Sears Below are the three books that were produced as a result of and that describe the Geodetic Survey of Georgia.  The first is the one described by Josh.  They describe the geodetic monuments throughout the state that existed at that time in great detail.  The Geodetic Survey of Georgia was mainly a WPA project, but had and has practical applications.  I’ve seen the first two volumes listed below offered for sale as a set on the internet for less than $100.  The University of Georgia Library has Frederick H. McDonald’s personal copy of the first volume at: Georgia Room/QB296/.U9G4.  It has newspaper clippings glued in and handwritten notes about the Geodetic Survey of Georgia and about McDonald.  The additional items below are the acts that created the Geodetic Survey of Georgia.  I took the acts from the Georgia Legislative Documents Project web site.  The copies of the acts in it were scanned using optical recognition software and are not totally reliable.  To get completely reliable copies you need to go to the published versions.          I am very familiar with Coffee Bluff Road in Chatham County.  Do you have the coordinates or other description of the monument in the picture that you can post?  If so, I can look it up in the books referred to.       Farris Cadle   Georgia. State Highway Board. Geodetic Survey of Georgia Published by the State of Georgia as a Report on Official Project No. 65-34-4581. Conducted under the auspices of the Works Progress Administration of Georgia, in Cooperation with the U.S. Coast and Geodetic Survey, l933-l938. Edited by Frederick H. McDonald. With L. G. Simmons, technical adviser. Sponsored by Georgia School of Technology. Atlanta: Division of Highway Planning, State Highway Board of Georgia, 1938.   ---. Geodetic Survey of Georgia. Supplement. Conducted in Cooperation with Federal Works Agency, Works Project Administration, U.S. Coast and Geodetic Survey and the Division of Highway Planning. Atlanta: State Highway Board of Georgia, 1942.   United States. Work Projects Administration. Georgia. State Planning Board. Geodetic Survey of Glynn County, Georgia. Published by the Glynn County Planning Board as a Report on Official Project No. 65-1-34-104. Prosecuted by the Federal Works Agency Work Projects Administration, in Cooperation with the U.S. Coast and Geodetic Survey and the Georgia State Planning Board. Atlanta: 1940.     ACTS AND RESOLUTIONS OF THE GENERAL ASSEMBLY OF THE STATE OF GEORGIA 1939 PART II.--LOCAL AND SPECIAL LAWS TITLE II. COUNTIES AND COUNTY MATTERS. 1939 Vol. 1 -- Page 609 Sequential Number: 254 Short Title: GLYNN -- U. S. COAST AND GEODETIC SURVEY SYSTEM ADOPTED. Law Number: No. 68. Full Title: An Act to describe, define and officially name a system of coordinates for designating the positions of points [page 610:] on the surface of the earth within Glynn County; and for other purposes.             Be it enacted by the General Assembly of the State of Georgia:           Section 1. The system of plane rectangular coordinates which has been established by the United States Coast and Geodetic Survey for defining and stating the positions or locations of points in the eastern part of Georgia and officially known by that Bureau as "The Georgia Coordinate System, East Zone," is hereby adopted for that use in Glynn County. [Sidenote: Adoption of system.]           Section 2. The plane rectangular coordinates of a point on the earth's surface, to be used in expressing the position of location of such point in this system, shall consist of two distances, expressed in feet and decimals thereof. One of these distances to be known as the "x coordinate" shall give the position in an east-and-west direction; the other to be known as the "y coordinate" shall give the position in a north-and-south direction. These coordinates shall be made to depend upon and conform to the plane rectangular coordinates of the triangulation and traverse stations of the United States Coast and Geodetic Survey within Glynn County, as these coordinates have been determined by said survey. [Sidenote: Coordinates.]           Section 3. For the purpose of more precisely defining the Georgia Coordinate System, East Zone, the following definition by the United States Coast & Geodetic Survey is adopted; [Sidenote: System defined.] The Georgia Coordinate System, East Zone, is a transverse Mercator projection of the Clarke Spheroid of 1866, having a central meridian 82 degrees 10 minutes west from Greenwich, on which meridian the scale is set one part in 10,000 too small. The origin of coordinates is at the intersection of the meridian 82 degrees [page 611:] 10 minutes west longitude and the parallel 30 minutes north latitude. This origin is given the coordinates: x -- 500,000 feet and y -- 0 feet The position of the Georgia Coordinate System, East Zone, shall be as marked on the ground by triangulation or traverse stations established in conformity with standards adopted by the United States Coast & Geodetic Survey for first-and second-order work, whose geodetic positions have been rigidly adjusted on the North American datum of 1927 and whose coordinates have been computed on the system herein defined. [Sidenote: Traverse stations.]           Section 4. For the purpose of describing the location of any survey station or land boundary corner in Glynn County it shall be considered a complete legal and satisfactory description of such location to give the position of survey station or land boundary corner on the system of plane coordinates established by the United States Coast and Geodetic Survey and defined in this Act. [Sidenote: Legal description.]           Section 5. The Glynn County Planning Board shall have authority to formulate rules and regulations for surveys to be based on the Georgia Coordinate System, East Zone and for the administration of this Act. [Sidenote: Planning board to formulate rules.]           Section 6. The use of the term "Georgia Coordinate System, East Zone" on any map, report or survey, or other document, shall be limited to coordinates based on the Georgia Coordinate System, East Zone, as defined in this Act. [Sidenote: Limit of system.]           Section 7. Nothing Contained in this Act shall be interpreted as requiring any purchaser or mortgagee to rely wholly on a description based upon the aforementioned system. [Sidenote: Purchasers and mortgagees.]           Section 8. This Act is to take effect January 1st, 1940. [Sidenote: Effective date.] [page 612:]           Section 9. All laws and parts of laws in conflict here-with are hereby repealed.           Approval Date: Approved February 21, 1939.       ACTS AND RESOLUTIONS OF THE GENERAL ASSEMBLY OF THE STATE OF GEORGIA 1941 PART II.--LOCAL AND SPECIAL LAWS. TITLE II. COUNTIES AND COUNTY MATTERS. 1941 Vol. 1 -- Page 788 Sequential Number: 269   Short Title: BRYAN -- U. S. COAST AND GEODETIC SURVEY SYSTEM ADOPTED. Law Number: No. 235. Full Title: An Act To describe, define and officially name a system of coordinates for designating the positions of points on the surface of the earth within Bryan County; and for other purposes.           Be it enacted by the General Assembly of the State of Georgia:           Section 1. The system of plans rectangular coordinates which has been established by the United States Coast and Geodetic Survey for defining and stating the positions or locations of points in the eastern part of Georgia and officially known by that Bureau as "The Georgia Coordinate System, East Zone", is hereby adopted for that use in Bryan County. [Sidenote: System adopted.]           Section 2. The plane rectangular coordinates of a point on the earth's surface, to be used in expressing the position of location of such point in this system, shall consist of two distances, expressed in feet and decimals thereof. One of these distances to be known as the "x coordinate" shall give the position in an east-and-west direction; the other to be known as the "y coordinate" shall give the position in a north-and-south direction. These coordinates shall be made to depend upon and conform to the plane rectangular coordinates of the triangulation and traverse stations of the United States Coast and Geodetic Survey within Bryan [page 789:] County, as these coordinates have been determined by said survey. [Sidenote: Coordinates named.]           Section 3. For the purpose of more precisely defining the Georgia Coordinate System, East Zone, the following definition by the United States Coast and Geodetic Survey is adopted; The Georgia Coordinate System, East Zone, is a transverse Mercator projection of the Clarke Spheroid of 1866, having a central meridian 82 degrees 10 minutes west from Greenwich, on which meridian the scale is set one part in 10,000 too small. The origin of coordinates is at the intersection of the meridian 82 degrees 10 minutes west longitude and the parallel 30 minutes north latitude. This origin is given the coordinates: [Sidenote: Definition.] x = 500,000 feet and y = 0 feet. The position of the Georgia Coordinate System, East Zone, shall be as marked on the ground by triangulation of traverse stations established in conformity with standards adopted by the United States Coast and Geodetic Survey for first-and second-order work, whose geodetic positions have been rigidly adjusted on the North American datum of 1927 and whose coordinates have been computed on the system herein defined.           Section 4. For the purpose of describing the location of any survey station or land boundary corner in Bryan County it shall be considered a complete legal and satisfactory description of such location to give the position of survey station or land boundary corner on the system of plane coordinates established by the United States Coast and Geodetic Survey and defined in this Act. [Sidenote: Uses.]           Section 5. The Commissioners of Roads and Revenues of Bryan County shall have authority to formulate rules and regulations for surveys to be based on the Georgia [page 790:] Coordinate System, East Zone, and for the administration of this Act.           Section 6. The use of the term "Georgia Coordinate System, East Zone" on any map, report or survey, or other document, shall be limited to coordinates based on the Georgia Coordinate System, East Zone, as defined in this Act. [Sidenote: Limitation.]           Section 7. Nothing contained in this Act shall be interpreted as requiring any purchaser or mortgagee to rely wholly on a description based upon the aforementioned system.           Section 8. This Act is to take effect January 1st, 1940. [Sidenote: Effective date.]           Section 9. All laws and parts of laws in conflict herewith are hereby repealed.           Approval Date: Approved March 22, 1941.     ACTS AND RESOLUTIONS OF THE GENERAL ASSEMBLY OF THE STATE OF GEORGIA 1941 PART II.--LOCAL AND SPECIAL LAWS. TITLE II. COUNTIES AND COUNTY MATTERS. 1941 Vol. 1 -- Page 918 Sequential Number: 312 Short Title: LIBERTY -- U. S. COAST AND GEODETIC SURVEY ADOPTED. Law Number: No. 400. Full Title: An Act To describe, define and officially name a system of coordinates for designating the positions of points on the surface of the earth within Liberty County; and for other purposes.           Be it enacted by the General Assembly of the State of Georgia:           Section 1. The system of plane rectangular coordinates which has been established by the United States Coast and Geodetic Survey for defining and stating the positions or locations of points in the eastern part of Georgia and officially known by that Bureau as "The Georgia Coordinate System, East Zone", is hereby adopted for that use in Liberty County. [Sidenote: Geodetic survey adopted.]           Section 2. The plane rectangular coordinates of a point on the earth's surface, to be used in expressing the position of location of such point in this system, shall consist of two distances, expressed in feet and decimals thereof. One of these distances to be known as the "x coordinate" shall give the position in an east-and-west direction; the other to be known as the "y coordinate" shall give the position in a north-and-south direction. These coordinates shall be made to depend upon and conform to the plane rectangular coordinates of the triangulation and traverse stations of the United States Coast and Geodetic Survey within Liberty County, as these coordinates have been determined by said survey. [Sidenote: Coordinates.]           Section 3. For the purpose of more precisely defining the Georgia Coordinate System, East Zone, the following definition by the United States Coast & Geodetic Survey is adopted; [page 919:] The Georgia Coordinate System, East Zone, is a transverse Mercator projection of the Clarke Spheroid of 1866, having a central meridian 82 degrees 10 minutes west from Greenwich, on which meridian the scale is set one part in 10,000 too small. The origin of coordinates is at the intersection of the meridian 82 degrees 10 minutes west longitude and the parallel 30 minutes north latitude. This origin is given the coordinates: [Sidenote: Definition.] x -- 500,000 feet and 7 -- 0 feet. The position of the Georgia Coordinate System, East Zone, shall be as marked on the ground by triangulation of traverse stations established in conformity with standards adopted by the United States Coast & Geodetic Survey for first-and second-order work, whose geodetic positions have been rigidly adjusted on the North American datum of 1927 and whose coordinates have been computed on the system herein defined.           Section 4. For the purpose of describing the location of any survey station or land boundary corner in Liberty County it shall be considered a complete legal and satisfactory description of such location to give the position of survey station or land boundary corner on the system of plane coordinates established by the United States Coast and Geodetic Survey and defined in this Act. [Sidenote: Legal description.]           Section 5. The Planning Board or Commissioners of Roads and Revenues of Liberty County shall have authority to formulate rules and regulations for surveys to be based on the Georgia Coordinate System, East Zone, and for the administration of this Act. [Sidenote: Rules for surveys.]           Section 6. The use of the term "Georgia Coordinate System, East Zone" on any map, report or survey, or other document, shall be limited to coordinates based on the Georgia Coordinate System, East Zone, as defined in this Act. [Sidenote: Limitations.]           Section 7. Nothing contained in this Act shall be interpreted [page 920:] as requiring any purchaser or mortgagee to rely wholly on a description based upon the aforementioned system.           Section 8. This Act is to take effect upon the date it is passed. [Sidenote: Effective date.]           Section 9. All laws and parts of laws in conflict herewith are hereby repealed.           Approval Date: Approved March 27, 1941.     ACTS AND RESOLUTIONS OF THE GENERAL ASSEMBLY OF THE STATE OF GEORGIA 1945 PART I Amendment to Constitution of Georgia of 1877. Title I 1945 Vol. 1 -- Page 218 Sequential Number: 068 Short Title: GEORGIA COORDINATE SYSTEM. Law Number: No. 274. Full Title: An Act to describe, define, and officially adopt a system of coordinates for designating and stating the positions of points on the surface of the earth within the State of Georgia and for other purposes.           Be it enacted by the General Assembly of Georgia and it is hereby enacted by authority of the same:           Section 1. The system of plane coordinates which has been established by the United States Coast and Geodetic Survey for defining and stating the positions or locations of points on the surface of the earth within the State of Georgia is hereafter to be known and designated as the "Georgia Coordinate System." For the purpose of the use of this system the State is divided into an "East Zone" and a "West Zone." The area now included in the following counties shall constitute the East zone: Appling, Atkinson, Bacon, Baldwin, Brantley, Bryan, Bulloch, Burke, Camden, Candler, Charlton, Chatham, Clinch, Coffee, Columbia, Dodge, Echols, Effingham, Elbert, Emanuel, Evans, Franklin, Glascock, Glynn, Greene, Hancock, Hart, Jeff Davis, Jefferson, Jenkins, Johnson, Laurens, Liberty, Lincoln, Long, McDuffie, McIntosh, Madison, Montgomery, Oglethorpe, Pierce, Richmond, Screven, Stephens, Taliaferro, Tattnall, Telfair, Toombs, Treutlen, Ware, Warren, Washington, Wayne, Wheeler, Wilkes, and Wilkinson. [Sidenote: Zones.] The area now included in the following counties shall constitute the West Zone: Baker, Banks, Barrow, Bartow, Ben Hill, Berrien, Bibb, Bleckley, Brooks, Butts, Calhoun, Carroll, Catoosa, Chattahoochee, Chattooga, Cherokee, Clarke, Clay, Clayton, Cobb, Colquitt, Cook, [page 219:] Coweta, Crawford, Crisp, Dade, Dawson, Decatur, DeKalb, Dooly, Dougherty, Douglas, Early, Fannin, Fayette, Floyd, Forsyth, Fulton, Gilmer, Gordon, Grady, Gwinnett, Habersham, Hall, Haralson, Harris, Heard, Henry, Houston, Irwin, Jackson, Jasper, Jones, Lamar, Lanier, Lee, Lowndes, Lumpkin, Macon, Marion, Meriwether, Miller, Mitchell, Monroe, Morgan, Murray, Muscogee, Newton, Oconee, Paulding, Peach, Pickens, Pike, Polk, Pulaski, Putnam, Quitman, Rabun, Randolph, Rockdale, Schley, Seminole, Spalding, Stewart, Sumter, Talbot, Taylor, Terrell, Thomas, Tift, Towns, Troup, Turner, Twiggs, Union, Upson, Walker, Walton, Webster, White, Whitfield, Wilcox, and Worth.           Section 2. As established for use in the East Zone, the Georgia Coordinate System shall be named, and in any land description in which it is used it shall be designated, the "Georgia Coordinate System, East Zone." [Sidenote: Land description.]           As established for use in the West Zone, the Georgia Coordinate System shall be named, and in any land description in which it is used it shall be designated, the "Georgia Coordinate System, West Zone."           Section 3. The plane coordinates of a point on the earth's surface, to be used in expressing the position or location of such point in the appropriate zone of this system, shall consist of two distances, expressed in feet and decimals of a foot. One of these distances, to be known as the "x-coordinate", shall give the position in an east-and-west direction; the other, to be known as the "y-coordinate", shall give the position in a north-and-south direction. These coordinates shall be made to depend upon and conform to the coordinates, on the Georgia Coordinate System, of the triangulation and traverse stations within the State of Georgia, as those coordinates have been determined by said survey.           Section 4. When any tract of land to be defined by a single description extends from one into the other of the above coordinate zones, the positions of all points on its boundaries may be referred to either of said zones, the zone which is used being specifically named in the description. [page 220:]           Section 5. (a) For the purpose of more precisely defining the Georgia Coordinate System, the following definition by the United States Coast and Geodetic Survey is adopted. The Georgia Coordinate System, East Zone, is a transverse Mercator projection of the Clarke spheroid of 1866, having a central meridian eighty-two degrees ten minutes west of Greenwich, on which meridian the scale is set one part in 10,000 too small. The origin of coordinates is at the intersection of the meridian eighty-two degrees ten minutes west of Greenwich and the parallel thirty degrees north latitude. This origin is given the coordinates: x - 500,000 feet and y - 0 feet. [Sidenote: Definition.] The Georgia Coordinate System, West Zone, is a transverse Mercator projection of the Clarke spheroid of 1866, having a central meridian eighty-four degrees ten minutes west of Greenwich, on which meridian the scale is set one part in 10,000 too small. The origin of coordinates is at the intersection of the meridian eighty-four degrees ten minutes west of Greenwich and the parallel thirty degrees north latitude. This origin is given the coordinates: x - 500,000 feet and y - 0 feet. (b) The position of the Georgia Coordinate System shall be as marked on the ground by triangulation or traverse stations established in conformity with standards adopted by the United States Coast and Geodetic Survey for first-order and second-order work, whose geodetic positions have been rigidly adjusted on the North American datum of 1927, and whose coordinates have been computed on the system herein defined. Any such station may be used for establishing a survey connection with the Georgia Coordinate System.           Section 6. The use of the term "Georgia Coordinate System" on any map, report of survey, or other document, shall be limited to coordinates based on the Georgia Coordinate System as defined in this Act.           Section 7. Nothing contained in this Act shall require any purchaser or mortgagee to rely on a description, any [page 221:] part of which depends exclusively upon the Georgia Coordinate System. Nothing in this act shall be so construed as to require any person, firm, or corporation to use the system of co-ordinates herein provided for in order to obtain or secure a legal description of land or real estate.           Section 8. If any provision of this Act shall be declared invalid, such invalidity shall not affect any other portion of this Act which can be given effect without the invalid portion, and to this end the provisions of this Act are declared to be severable.           Section 9. All laws and parts of laws in conflict with this Act are hereby repealed.           Approval Date: Approved March 6, 1945.    
by Farris Cadle, Inc.
Monday, December 1, 2014
Staking a Muti-million dollar home site on the wrong lot 1 C. Carpenter Imagine coming into the office, one Monday morning, and finding that message in your voicemail. We all make mistakes. It's not if we're going to make a mistake, the question is when and how big. The best QA/QC plan and procedures, only helps to reduce the likelihood and hopefully severity of blunders that can occur during our daily work day. Stories like this should help keep us mindful of the risk we bear, compared to the reward we get and the care we take while providing our professional services.
by J. Higgins
Monday, October 20, 2014
Records of Steed & Boyd 0 T. Pruitt, Jr. I am looking for as to whom might have the records for Steed & Boyd.
by T. Pruitt, Jr.
Monday, October 6, 2014
Important Information About the Georgia Museum of Surveying and Mapping 0 T. Turk Below is a news release sent out by the Board of Directors for the GA Museum of Surveying and Mapping recently. We have received interest from a few folks and remain hopeful that a new home can be found for our museum. Dan Crumpton has had a photographer take photos of much of the museum so we can all see what a treasure this is for our profession. Please take a few moments and take a virtual tour of our museum at this link: http://huebener.net/album/GAMOSAM/ Below is the news release: Georgia Museum of Surveying Mapping Faces Closure The Georgia Museum of Surveying and Mapping (GAMOSAM), located in Warrenton, GA, faces closure in the very near future unless a new home for the museum is located very soon. The museum was started in the late 2000’s by Mr. Dan Crumpton, a local historian, land surveyor and forester in Warrenton, GA. Dan has always had a passion for the history of the land surveying profession, and he has directed this passion into the creation of this museum. The museum was officially incorporated in 2009 and a board of directors was established at that time. The museum is currently housed in a store front in downtown Warrenton, GA, and has well over 100 valuable survey related artifacts. These artifacts include a wide range of items, including antique land surveying equipment, computers, plotters, maps, etc. Most of these artifacts were donated to the museum from land surveyors throughout the state of GA. Mr. Crumpton has announced his impending retirement from land surveying and from the museum to the museum's board of directors and has expressed his strong desire to hand off the museum to another person or entity for care and management. The Board and Mr. Crumpton are seeking someone to house and manage this museum, preferably within the state of GA. This museum is a valuable asset to our profession and our state and would have a bright future if it were to be kept together and managed appropriately. The museum's board of directors is seeking ideas for possible locations for the museum. We are asking all land surveyors within the state to please consider your community and local resources and let any member of the board of GAMOSAM know if you or someone in your community are interested in housing this museum. If we are not able to locate a new home for the museum by early 2015, we will likely lose this asset to our profession and state forever! If you are interested in this opportunity, or if you know a person or entity that may be interested, please contact Mr. DanCrumpton directly via phone at 706-465-9919 or via email at dan@crumptonplats.com.
by T. Turk
Tuesday, September 16, 2014
records of Tri County Land Surveying 1 A. Costarides I have them. I have scanned them in and indexed them; however, I have not uploaded them to GLS Archives yet. Send me an E-mail and I will gladly share what I have. Josh Lewis 4JLewis4@glsurvey.com
by J. Lewis
Wednesday, July 23, 2014
Records of Delta Engineers, Smyrna 3 Farris Cadle, Inc. Tom was one of the best. I followed him on a tract that had a lake. The survey was excellent and the man in the boat fishing on the lake was a classic. When I passed the RLS, he sent a note expressing that my Father who had passed a few years before would be proud of me. I always respected his professionalism.
by L. Brown
Tuesday, July 15, 2014
Job Listings Issue 0 T. Turk Hello Fellow SAMSOG Members - we currently have an issue with our website related to job postings.   The "Job Listings" link under "Publications" does not work.  You will find current job listings located under "Resources", and then "Careers".      There are several companies advertising for help right now!  ThanksTrent
by T. Turk
Friday, June 27, 2014
Meridian Surveying Records 1 M. Lincoln I believe his records are at Travis Pruitt
by L. Brown
Friday, June 13, 2014
Free Scaner 1 J. Lewis The scanner has found a good home.Josh 4
by J. Lewis
Friday, May 9, 2014
SPSU wins the NSPS student competition 2014 0 L. Sears Congratulations are in order ! This year's competition was for the students to complete an ALTA/ACSM Survey of a maximum five acre commercial site.  The competition was divided into three categories: Binder with all supporting documentation, plat of survey (24" X 36") size and a presentation of no more than 20 minutes (to be presented to your client i.e. the NSPS judges - total of five) about your findings conducting the survey as well as explaining "what you did and why did it" based upon the Teams submitted Final Plat of Survey. The Teams they competed against were from Fresno State, CA; Utah Valley; Oregon Institute of Technology; New Mexico Institute of Technology, Michigan Tech, New Jersey Institute of Technology and Penn State. The SPSU team placed 1st !!!! I am happy to say I saw all of the presentations, and our kids ROCKED !!! It was a great experience.
by L. Sears
Thursday, April 17, 2014
Recording Requirments 0 J. Lewis I would like to start a discussion about the Secretary of State’s recording requirements for plat maps.   I have thought about writing on this subject for some time and with the new SAMSOG webpage now seems like as good a time as any.First, 200 dpi in black and white just is not cutting it. Print and scanning technology is moving at warp speed and we just took a step back to the late 1700’s. The stone and copper lithographic prints were much better than what the record rooms can reproduce when the image is scanned in at 200dpi “one bit color”. That is what the state’s requirements are, one bit color. HAH!  If you don’t understand what one bit color is imagine a square of Christmas lights. Kind of like an old Light Bright toy if you ever had one. Each light represents a pixel on your computer monitor or a droplet of ink on your plotter. Under the current requirements there can only be two colors, black or white, per light. This leaves out so much detail. If you were to shade a sewer easement then all the text in the easement is lost because the computer can only show black or white. There is no shading. Second what is the use in showing the signature in contrasting ink if the scan does not pick it up? Here is a scanned image of the first map of the city of Atlanta. It was printed in 1853, it is so much better than a modern survey printed at the record room. I know that we can do so much better that is what is frustrating.  My 2 centsJosh Lewis 4
by J. Lewis
Tuesday, April 1, 2014
GPS on Benchmarks are still needed 1 L. Sears To the Professional Surveyors of Georgia,             There is a national effort being endorsed by the National Society of Professional Surveyors (NSPS) and the National Geodetic Survey (NGS) to improve benchmarks in the USA. Our state organization of SAMSOG and the Geospatial Committee hopes that each chapter (if not each surveyor) will participate in this worthy endeavor. Below is a copy of the description of the campaign from the NGS web site.             The geoid accuracy in Georgia is poor compared to other states. This effort will improve this accuracy on and around the benchmarks you choose to occupy. The map below shows the areas in need of improved accuracy. Most of Georgia is included in the poorer areas. This campaign could help us a lot for future survey vertical accuracy.             The best scenario would be to occupy several benchmarks in your area during and after National Surveyors Week. The more we can occupy, the better GPS derived heights will be in the future. A coordination effort should prevent duplicate observations.             Please send this information to your chapter members and organize a local campaign to occupy as many benchmarks as you can during National Surveyors week. Public places would be good so the surveyor can be seen and be given a chance to explain a little about surveying to the public. Here is the link to the NGS page http://www.ngs.noaa.gov/heightmod/GPSonBM.shtml             Please send me a report of your chapters interest and their commitment to this campaign. Please Do Not wait until your next scheduled meeting! The planning and coordination will not take a lot of time and your members will need to make plans to participate.             Once you receive an OPUS report on a benchmark, please forward it to me so I can keep a tally on the number our state completed. If I can be of assistance, please call me. My contact info is at the bottom of this email. 2014 GPS on Bench Marks Campaign NGS encourages anyone with survey-grade Global Positioning System (GPS) receivers to join the 2014 GPS on Bench Marks Campaign, a National Surveyors Week (March 16-22) event to raise awareness about professional surveying while improving the National Spatial Reference System (NSRS).   Why Participate? The nation’s height system, the North American Datum of 1988 (NAVD88), is founded on historic geodetic leveling surveys on thousands of bench marks that are often difficult and expensive to access. By adding GPS coordinates to these marks, the height system can be modeled in GPS survey systems for easier access. The latest hybrid geoid model,GEOID12A , includes many “GPS on bench mark” observations, but would benefit from additional data collection in many areas   How to Participate: 1.     Find local bench marks using the NGS Data Explorer or DSWorld . Review the corresponding datasheet to make sure it is a 1st- or 2nd-order NAVD 88 bench mark.  2.     Pick the best bench marks to help improve the nation’s height system. If using DSWorld, view the GEOID12A accuracy map, and prioritize NAVD 88 bench marks in the areas that are yellow or orange on the map. 3.     Visit your bench mark of interest and make sure it has a durable, stable setting, with good satellite visibility.  4.     Record a description and take photos of the bench mark to aid future recovery. (See optional observer field log and preview the upload form) 5.     Collect your data following careful field procedures. You should: a.     Collect a 4+ hour GPS data file b.     Verify antenna type, height, and plumb c.     Use a fixed height tripod (recommended), and brace the legs with sandbags or chain 6.     Share your data by uploading to OPUS using option 'share my solution.'.   What happens next? NGS will use your data to improve the next hybrid geoid model, increasing access to NAVD 88, and enabling conversions to the new vertical datum in 2022. Here is a map of the geoid uncertainties in Georgia. Green is +/- 2 cm, Yellow is +/- 4 cm, Orange is +/- 8 cm at the 95% confidence level. The goal is to turn this map completely green.
by L. Sears
Tuesday, April 1, 2014
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