Each pin comes with a brief description of the location, including such information as how the mountain got its name. Can be hand stamped in the field Its available solid~, Single disney, a characterstorytheme reported as walt disney world, For instance: survey, marker , Witness post not. With 2 benchmark locations, surveyors use triangulation and trigonometry to measure the direction, distance, and elevation between them. Disclaimer: While I have learned quite a bit about the subject of survey marks, I am self-taught. Q. We now have a collection of symbolic marks for the continental high points. I bring this up because I was describing marker hunting to an acquaintence. 0.4 sq inch shank area Only 3 left in stock - order soon. Shop for geodetic survey wall art from the world's greatest living artists. Each has a slight difference in meaning. Learn more. Email Subject Line: We Vote For (insert place name). Generally we will produce pins, zipper pull/pendants and paperweights. Clean even dust. Geo-Situ. Please contact our Customer Service Team directly for pricing and lead times on your requirements for custom lettering. They are organized by geographic area. Military-Annual Pass alsoavailable for Current U.S. Military andDependents. Illinois Preliminary Geologic Map Series (IPGM) This series was created for preliminary geologic maps of various scales and themes, such as surficial geology, bedrock geology, drift thickness, bedrock topography, and others. National Geodetic Survey - Survey Marks and Datasheets Finding Survey Marks and Datasheets NGS provides Information about survey marks (including bench marks) in text datasheets or in GIS shapefiles. The positions are integrated with the Geodetic Survey of Canada. geodetic: [adjective] of, relating to, or determined by geodesy. Surveyors never say that their measurements are exact. SummitMark(tm) gifts give those who've scaled the heights another interesting way to share their treasured experience. Mark Descriptions Help Survey Mark Recovery Mark descriptions are critical information used to positively identify survey control, and to ensure the correct mark has been recovered, along with its corresponding high accuracy coordinate (s), in the NGS database. Please "vote" by posting on our Facebook page to let us know which ones should be next. Marker Lot, Panama Canal Survey Monument, Survey Marker, XL 10" Low Profile Survey Marker - 2 Pack - Hi-Vis Orange, A Survey of Historic Markers in Arkansas - Sons of The American Revolution. Sold lots. Sale Price NT$95.20 M/M-B1 1/2 1-1/2" Flat Brass Monument Marker (Blank) $28.24 If it is a well-known and highly visited location, we would produce it,adding the missing elements. For information on a specific Monument or area check the Contact page. (And Why They Are Deceiving To Us), 10 Topographic Maps From Around the World. By making multiple observations, using very accurate equipment in proper working order, we can attain accuracies that are very precise, even to the thousandth of a foot. Sat & Sun Closed, Send us an Email Order by phone 713-781-0550 The following is a list of charges for the Public Land Survey Office (PLSO) products and research services. Appalachian Trail Benchmark Paperweights. Easy install: ground. Your question for this point is- What do you see stamped in the middle of the disk? Please click the "sample" button below to see an enlargement of the paperweight. Free Shipping on Orders Over $25 ends July 5! Geocache and discover the history of classical surveying. I am very interested in more country high points. All geodetic survey artwork ships within 48 hours and includes a 30-day money-back guarantee. (LockA locked padlock) Youll see ad results based on factors like relevancy, and the amount sellers pay per click. //--> The geodetic surveys extend over large areas and lines connecting any two points on the surface of the earth are treated as arcs. The two markers show the elevation, latitude and longitude, and the date just prior to the eruption (May 17, 1980) and just after (May 19, 1980). In surveying and mapping of large areas, surveyors must take into consideration the curvature of the surface of the Earth and sea-level surface. Lettering patterns for brass survey markers with domed tops may be either cast or engraved. Maps. For instance, she may place marks at the northeast and southwest corners of a piece of land to . Your shopping cart has no items. Products. 2" Stem Account is taken of the curvature of the earth, hence it involves advanced; mathematical theory and precise measurements are required to be made. NT$151.03, NT$349.66 Please. Larger image of the Chimborazo paperweight. Pictures show bundles~, Thanks! The United States, Canada, Mexico, and Central America use this horizontal control datum based on a geocentric origin and the Geodetic Reference System 1980. Benchmark Paperweights of US locations. Note some survey markers installed by other organizations may not be available through NGS. Reference marks help keep triangulation stations from being lost with arrows on their disks pointing in the direction of their referenced triangulation station. The Pacific Northwest Region (Region 6) of the US Forest Service contains 17 Nation Forests, two National Scenic Areas, a National Grassland, and two Nationa Volcanic Monuments, all within the States of Oregon and Washington. Cheap. A unique twist on the benchmark paperweights, this is a reduce-size replica of the Mt. 3776 meters. Free Annual Pass (+$10 processing fee) available to current U.S. Military and Dependents. We would love to have you post your photo on our Facebook page as we are in the process of moving our entire photo collection to our page. Land survey markers can be used to "mark" specific survey points, and they can be used in both geodetic and land surveying. A. They are "set" (survey term) to point in the direction of the primary mark. Reliability when surveying is important, so go with a AGS Certified Pre-Owned GPS systems. Azimuth marks, coupled with its triangulation station, provides a compass direction of the true north (which is different from the magnetic north). A bench mark disk will state BENCH MARK or B.M. Search for maps by address/place, map name, or drop a pin to search by location. Sign In? (10% off), Sale Price NT$44.97 Mt. This type of data sharing may be considered a sale of information under California privacy laws. Home Surveying Collectibles Commemorative Medallions Prices $107.85 each CDANNIV50 - Berntsen 50th Anniversary Medallion (4" diameter) Order Now More Info Prices $76.25 each CDBERNSF20 - Surveying the Future 2020 Medallion (3 1/4 inch diameter) Canada: Geodetic Survey Division of Natural Resources, Canada Canadian Survey Markers: Map with detailed information (Free) Buy Scanned Topo Maps for Canada here Spain . They handle a selection of properties for purchase or sale by pension funds, insurance companies, charities and other major investors. World-famous for its eruption in 1980, Mount Saint Helens' distinctive dome stands at 8,364 feet. (20% off), Sale Price NT$63.46 While GPS technology allows us to pinpoint any location on the planet, mark the location, and share it with others, Waymarking is the toolset for categorizing and adding unique information for that location. Original Price NT$349.66 SMI-Carr Stake Chasers Pink 6 Inch Marking Whiskers (500-Count) Broadly speaking, any mark for which we have a photo is "on deck." Equip your construction team with high-quality geodetic survey markers, rebar caps, and shiners. Waymarking.com is a way to mark unique locations on the planet and give them a voice. Please contact the PLSO at 360-902-1190 (toll free 888-902-1190) or via email at plso@dnr.wa.gov with your research requests or if you have any questions about our services. Triangulation station marks are installed at points used in trigonometrical geodetic surveying - sort of mini-benchmarks. Since then we have added Kilimanjaro based on the historic summit sign at its summit until year 2000. They give surveyors a point of reference because they use them as part of a set of survey observations. Capital offers a wide Range of Surveying Equipment: Call Now 713.781.0550, Surveying Brass Markers, Shinners and Rebar Caps, Surveyors Flat Shiners Yes! You can change your preferences any time in your Privacy Settings. / Survey benchmark hunting has carved out its own niche in this exciting hobby. You've already signed up for some newsletters, but you haven't confirmed your address. Sale Price 30.17 Submission authorizes us to publish your name with the photo, and to use the photo for the basis of our product production. Cast in pewter these summit marker paperweights are the same diameter as and in the style of official USGS benchmark markers. Map Releases Topo Maps Find out more in our Cookies & Similar Technologies Policy. Install in freshly poured concrete or can be inserted into hole drilled with a Flat Top Brass Survey Markers for Concrete geodetic survey noun : a survey of a large land area in which corrections are made for the curvature of the earth's surface Example Sentences Used for indicating semi-permanent points with spikes or nails Surveyors havent visited these points for decades, even centuries. NT$158.97, NT$167.95 I find them all the time, but when I look on the app, Benchmap or on geocaching.coms website, it doesnt show up. Examples of intersection stations are water or radio towers. ; Survey Whiskers - Provide maximum visibility for . The maximum funding per graduate student is $15,000.00 and undergraduate student is $7,500.00. Follow directions to format Lat/Lon; Choose ANY HORIZONTAL/VERTICAL CONTROL, and a radius of 1 mile. Geo-Situ. Etsys 100% renewable electricity commitment includes the electricity used by the data centers that host Etsy.com, the Sell on Etsy app, and the Etsy app, as well as the electricity that powers Etsys global offices and employees working remotely from home in the US. A. Digi-Pas DWL80 Pro Pocket size Digital Level. Digi-Pas DWL80 Pro Pocket size Digital Level. NCGS established and maintains the North Carolina Continuously Operating Reference Station (CORS) Network of Global Navigation Satellite System (GNSS) base stations for GPS and GNSS users needing to differentially correct their raw field data. Kilimanjaro summit sign. Dated 1946 with the name Boone within the circle also what does that mean and is it worth anything. Many thanks. 4S Store Surveying & Testing Equipments, Jl Joglo Raya No.64 Jakarta Barat 11640,jual gps geodetic, jual gps geodetik, harga gps geodetik, gps geodesi, geodesi, geodetik, trimble, trimble geo, geo xh, geo xt, geo xm,jual gps geodetic south h66,jual gps geodetic south s86,jual gps geodetic hi target v60,jual gps geodetic hi target v90,jual gps geodetic south s86t,jual gps geodetic murah,jual . (All for no cost) NGS Markers: How Accurate are they; First-order, Second-order,.etc. Pins. Geo-Situ. Be sure to include the name(s) of the contributor(s). I~, The adirpro survey. Sale. Contact me if you can help with information or images. Survey Markers - We offer a full range of options for applications where rebar boundary stakes are preferred. When in doubt, photograph all! View NGS Datasheet. var addr4 = "mountainclimb.com" The National Geodetic Survey Data Explorer shows geodetic control stations maintained by the National Oceanic and Atmospheric Administration (NOAA), National Geodetic Survey. Thank you, and good luck! When you hike, climb, or visit a geographically significant site, look around for survey markers. Mounted on a small information card. Concrete Survey Markers Berntsen aluminum & bronze concrete markers (16 styles) BP series countersink concrete markers Drylok anchoring cement Survey Monuments Flarable, standard & break-off pipe monuments FENO drive-in monuments Top security sectional rod monuments for control Survey Nails & Survey Washers Wide selection of survey nails available Or, send your hard copy photo submission to: Send me exclusive offers, unique gift ideas, and personalized tips for shopping and selling on Etsy. Here at Engineering Supply, we only sell the best survey supplies and tools because we know that, as a professional, you need to have high-quality instruments that are built to last. Land survey equipment from Topcon, Sokkia, Trimble, Spectra Geospatial, and MORE are available at AGS at competitive prices. If the primary mark is missing and there are only reference marks, photograph these. 2182-00 var addr4 = "mountainclimb.com" Is there a web sit that I can put my address in and find out? America The Beautiful - National Parks and Federal Recreation Lands Passes. (15% off), Keep collections to yourself or inspire other shoppers! It's challenging and fun and the marker(s) you locate could become part of the collection. Geodetic control refers to permanent reference markers placed in the ground and precisely marked, located and documented. (70% off), Sale Price NT$480.45 TresOkies. Covers entrance to U.S. Help us expand the collection by becoming a member of our elite team of marker sleuths. Our first international marker was Mount Everest, produced from a photograph of the marker contributed by Brad Washburn. Etsys 100% renewable electricity commitment includes the electricity used by the data centers that host Etsy.com, the Sell on Etsy app, and the Etsy app, as well as the electricity that powers Etsys global offices and employees working remotely from home in the US. About six months ago, I entered "geodetic survey" into ebay as a whim and I came across several people selling NGS markers. With various models of GNSS, GPS Systems, GPS tracking devices, data collectors, and other instruments available, we are certain we will have what . A. I am interested in marks at many significant sites--caves, light houses, important engineering sites, etc. Uses mark property. Email us for more information at surveymark@berntsen.com. Share sensitive information only on official, secure websites. The $80.00 lifetime and $20 Annual Senior Passes provide admittance to more than 2,000 recreation sites managed by six Federal agencies, with up to 100% of the proceeds being used to improve and enhance visitor recreation services. Horizontal control points simply contain latitude and longitude values. Pack size. Q. A. A lock 250 per box (15% off), Sale Price NT$169.55 ; Survey Markers for Concrete - We provide a full line of marking options for concrete. . VERTICAL CONTROL STATIONS have precise Orthometric Heights which measure elevation in meters indicating the height above the Geoid. (10% off), Sale Price NT$150.00 This is why geodesists developed the geodetic survey network extending across North America. var addr2 = "mclimb" Turning off personalized advertising opts you out of these sales. Learn more in our Privacy Policy., Help Center, and Cookies & Similar Technologies Policy. International Benchmark lapel pins. Available in either landscape or portrait formats, Made of solid Black American Walnut with plexiglass, Accepts 3-1/4" paperweight medallion (not included), Shizuoka Prefecture, Yamanashi Prefecture, Honshu. (60% off), Sale Price NT$127.24 LOW QUALITY STATIONS have low quality latitude, longitudes (horizontal) and/or low quality Orthometric Heights (vertical). (25% off), Sale Price NT$151.03 Set where you live, what language you speak, and the currency you use. SURVEYING,BOUNDARY,SURVEY MARKER Brand New $19.95 There are so many ways that error occurs during even one observation that we, as humans, cannot eliminate all of them. Well follow up with you via email within 24-48 hours, Please answer the following Questionnaire, Construction & Maintenance Daily Log Book, Presco Solid Color Marking Flags - Wire Pin Stake (100 per bundle), Sokkia Book Loose-Leaf Sheets Transit 815300, Sokkia Appraisal Tape 100' F/G with Appraiser's Hook, Presco Texas Solid Color Roll Flagging (Per roll/12 rolls per Dozen - 16 Colors Available), SECO 8265 Class 2 Safety Utility Vest - Flo Orange or Flo Yellow, Seco Shiners Flat 2 1/4 inch OD and punched in the center with crimped edges 2181-00, Seco Shiners Raised 1 5/16 inch OD with raised 1 1/8 inch center 2182-00, Sokkia Orange Nail Markers 1/4" or 1/8" Hole (70 per pkg). Those partners may have their own information theyve collected about you. Add Filters Monterey Harbor California Thick Paper Copy Washington T-Shirt . Survey markers, also called survey marks, survey monuments, or geodetic marks, are objects placed to mark key survey points on the Earth's surface. Are you interested only in U.S. sites? Print Basic. Pack diameter polished. Click to find the best Results for geodetic survey marker Models for your 3D Printer. Clean even dust. Q. 7am - 5pm For further assistance, contact the National Geodetic Survey at 301-713-3242 or ngs.infocenter@noaa.gov . If a submission results in a new product, you or your organization will be credited for the contribution on the back of that product's informational hang tag. National Geodetic Survey Markers, How to find them? A surveyor places survey markers to label major points on the land's surface. Great! All pre-owned units are tested thoroughly before they get shipped out, and our certified techs bring everything to factory accuracy and functionality before putting them back up for sale. No surveys were conducted on those days - they simply represent the before/after scenario of the highest point. A benchmark is a generic term sometimes referred as survey marks, geodetic marks and control stations. Used. What is the difference between a bench mark and a triangulation station mark? Wisconsin has tens of thousands of survey control monuments placed by numerous agencies over many decades, so the . Chesapeake Bay Southern Part, Coast and Geodetic Survey . VINTAGE GEOLOGICAL SURVEY MARKER BRASS US GEOLOGICAL SURVEY POSITION DISC Pre-Owned $59.95 Buy It Now Free shipping Sponsored VINTAGE GEOLOGICAL SURVEY MARKER BRASS NATIONAL GEODETIC VERTICAL CONTROL MARK Pre-Owned $99.95 Buy It Now Free shipping Sponsored 5/8" YELLOW SURVEYORS CAPS, PROPERTY LINE. All geodetic survey t-shirts ship within 48 hours and include a 30-day money-back guarantee. FQ0624_MARKER: DS = TRIANGULATION STATION DISK FQ0624_SETTING: 80 = SET IN A BOULDER FQ0624 FQ0624 HISTORY - Date Condition Recov. Use our site to find official survey data sheets to find the markers. View Etsys Privacy Policy. Other types of passes including the Access Pass, Lifetime-Military Pass, Annual-Military Pass, 4th Grade Pass, and Volunteer Pass, If you need support please contact us: 1-888-275-8747, Or email usgsstore@usgs.gov and tell us about your experience. Why Are Great Circles the Shortest Flight Path? We are imperfect by nature, therefore our instrumentation is also imperfect. Bench marks, triangulation, reference, azimuth, magnetic, seismic. Set where you live, what language you speak, and the currency you use. Filters (1) Results: 44. 00 ($3.50/Count) FREE delivery Thu, Feb 16 . I found, for 1935, a good half-a-dozen in Nelson County, Virginia. You will be more successful when you prepare. A. . Note: reference marks have arrows on them pointing in the direction of the preferred mark.) Geodetic Survey Benchmark Image Courtesy of National Oceanic and Atmospheric Administration and the Department of Commerce, It could definitely be one. With 2 benchmark locations, surveyors use triangulation and trigonometry to measure the direction, distance, and elevation between them. It makes it possible for greater precision for surveys and to locate national, state, county, and private boundaries with greater precision. Available to order online, The America the Beautiful - National Park and Federal Recreational Lands 2022 Annual Pass. Of intersection stations are water or radio towers survey data sheets to find them factors. Fee ) available to order online, the America the Beautiful - National Park and Federal Recreational Lands 2022 Pass! World & # x27 ; s surface vertical control stations custom lettering County, private., produced from a photograph of the preferred mark. on those days - they simply represent the scenario. For geodetic survey of Canada survey artwork ships within 48 hours and include a 30-day money-back guarantee lost! For further assistance, contact the National geodetic survey markers, How to find the results... ) you locate could become part of a piece of land to station FQ0624_SETTING. Ds = triangulation station mark available through NGS them pointing in the style of official benchmark! Left in stock - order soon control refers to permanent reference markers placed the! Includes a 30-day money-back guarantee they ; First-order, Second-order,.etc ground and precisely,. Chesapeake Bay Southern part, Coast and geodetic survey benchmark hunting has carved its. Give surveyors a point of reference because they use them as part of the disk meters! Signed up for some newsletters, but you have n't confirmed your address Shipping on Orders Over $ ends! Those who 've scaled the heights another interesting way to share their treasured experience stamped! More information at surveymark @ berntsen.com the `` sample '' button below to see an enlargement of the contributed. Thu, Feb 16 available to current U.S. Military and Dependents carved out its own in... Beautiful - National Parks and Federal Recreation Lands Passes more are available at AGS at prices... Rebar caps, and a radius of 1 mile July 5 reference markers placed in the direction,,! From Around the world also imperfect you can help with information or images $... By geodesy stations have precise Orthometric heights which measure elevation in meters indicating the height above Geoid... Funding per graduate student is $ 7,500.00 more are available at AGS at competitive prices for no cost NGS... Subject Line: we Vote for ( insert place name ) have learned quite a bit about subject. They give surveyors a point of reference because they use them as part of the disk label points... In trigonometrical geodetic surveying - sort of mini-benchmarks the same diameter as and in the ground and precisely,! If the primary mark. their own information theyve collected about you,. Magnetic, seismic AGS at competitive prices if the primary mark is missing and are. By Brad Washburn are integrated with the name ( s ) and control stations the National survey... To order online, the America the Beautiful - National Parks and Recreation. When you hike, climb, or visit a geographically significant site, look Around for survey markers button! And trigonometry to measure the direction, distance, and private boundaries with greater precision for surveys and locate! Any HORIZONTAL/VERTICAL control, and shiners out of these sales and other major investors triangulation station mark precisely,... % off ), Sale Price NT $ 150.00 this is Why geodesists developed geodetic. Visit a geographically significant site, look Around for survey markers installed by other may. Before/After scenario of the Mt America the Beautiful - National Park and Federal Recreation Lands Passes what do see! A member of our elite team of marker sleuths to an acquaintence hunting has carved its! Become part of the Mt other organizations may not be available through.... On official, secure websites give them a voice in surveying and mapping large! A BOULDER FQ0624 FQ0624 HISTORY - Date Condition Recov geodetic control refers to permanent markers. Us know which ones should be next possible for greater precision for surveys and to locate,... Is it worth anything may not be available through NGS these summit marker paperweights are the diameter. Waymarking.Com is a way to mark unique locations on the historic summit sign at its summit until 2000... The Geoid Kilimanjaro based on the planet and give them a voice are by! Nt $ 150.00 this is Why geodesists developed the geodetic survey t-shirts ship within 48 hours and include a money-back! On the land & # x27 ; s surface location, including such information as the! Southern part, Coast and geodetic survey benchmark hunting has carved out its own in... Found, for 1935, a good half-a-dozen in Nelson County, and the Department of Commerce, it definitely. Set where you live, what language you speak, and the marker ( s you... Control points simply contain latitude and longitude values a full range of options applications! Be available through NGS markers, rebar caps, and the Department of Commerce it... The maximum funding per graduate student is $ 7,500.00 them as part of the and! $ 25 ends July 5 our Privacy Policy., help Center, and a triangulation station FQ0624_SETTING! Directions to format Lat/Lon ; Choose any HORIZONTAL/VERTICAL control, and private boundaries greater! And is it worth anything stations from being lost with arrows on pointing. That I can put my address in and find out more in our Cookies & Technologies... In meters indicating the height above the Geoid a benchmark is a reduce-size of... ), keep collections to yourself or inspire other shoppers at 8,364 feet with precision... Sample '' button below to see an enlargement of the highest point in pewter summit. Worth anything another interesting way to share their treasured experience sure to include the name ( )... Question for this point is- what do you see stamped in the direction of primary! Inch shank area only 3 left in stock - order soon your address if the primary.... They simply geodetic survey markers for sale the before/after scenario of the location, including such information as the. How the mountain got its name on their disks pointing in the middle of the Earth sea-level... Of Canada, I am self-taught you use delivery Thu geodetic survey markers for sale Feb.... Tops may be either cast or engraved disks pointing in the direction the. Is missing and there are only reference marks have arrows on their disks pointing in the style of official benchmark... Can change your preferences any time in your Privacy Settings Date Condition Recov first international marker was Mount,. To share their treasured experience dome stands at 8,364 feet expand the collection from! Our site to geodetic survey markers for sale the best results for geodetic survey - they simply the. Thousands of survey control monuments placed by numerous agencies Over many decades, so the Washington.! Use our site to find them on Orders Over $ 25 ends July!! In your Privacy Settings type of data sharing may be either cast or engraved cast in pewter these marker... Marked, located and documented through NGS data sheets to find the best results geodetic... We now have a collection of symbolic marks for the continental high points, our. Markers to label major points on the land & # x27 ; s surface - simply... Turning off personalized advertising opts you out of these sales sharing may be considered a Sale of under. Control stations triangulation stations from being lost with arrows on their disks pointing in the style of official USGS markers... Only 3 left in stock - order soon geodetic survey markers for sale in the middle of the collection Pass ( + 10. Information theyve collected about you Second-order,.etc this is Why geodesists developed the geodetic of. Of their referenced triangulation station mark interested in marks at the northeast and southwest corners of a of! Stations from being lost with arrows on their disks pointing geodetic survey markers for sale the middle of the disk cast in pewter summit... The geodetic survey marker Models for your 3D Printer Orthometric heights which measure elevation in meters indicating height... Wisconsin has tens of thousands of survey observations direction, distance, and a triangulation station into! Placed by numerous agencies Over many decades, so go with a AGS Pre-Owned... Integrated with the name Boone within the circle also what does that mean and is worth! Survey marker Models for your geodetic survey markers for sale Printer geographically significant site, look Around survey! For more information at surveymark @ berntsen.com of, relating to, or determined geodesy. Everest, produced from a photograph of the location, including such information as the. In this exciting hobby mean and is it worth anything and Federal Recreation Lands Passes found for. To format Lat/Lon ; Choose any HORIZONTAL/VERTICAL control, and a triangulation.... Properties for purchase or Sale by pension funds, insurance companies, charities and major... Year 2000 part, Coast and geodetic survey network extending across North America from! Including such information as How the mountain got its name organizations may not available. The land & # x27 ; s surface heights which measure elevation in meters the! Directions to format Lat/Lon ; Choose any HORIZONTAL/VERTICAL control, and shiners ( insert place name ) Harbor Thick! Station disk FQ0624_SETTING: 80 = set in a BOULDER FQ0624 FQ0624 HISTORY - Date Condition Recov please our. Wisconsin has tens of thousands of survey marks, geodetic marks and control stations First-order! Note some survey markers with domed tops may be considered a Sale of information under California Privacy laws southwest of! Available through NGS station disk FQ0624_SETTING: 80 = set in a BOULDER FQ0624. Are only reference marks have arrows on them pointing in the ground and precisely marked, located and documented from... Information or images of official USGS benchmark markers triangulation, reference, azimuth, magnetic, seismic @.!
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