(PHP Syntax), From an array of objects, extract value of a property as array. Thanks for contributing an answer to Geographic Information Systems Stack Exchange! The following projection file converts an NAD27 dataset to an NAD83 dataset in Canada: Why y-coordinates may seem 200 meters too large. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Go to the menu File>Options Select Advanced At the bottom of the list of options, check the option " Use 1904 date system " Customize the time format Now, let's customize the format of our cell: Open the Format cell dialog box ( Ctrl + 1) Select the option Custom In the Type box, enter this format code exactly as it is displayed below Your previous content has been restored. Can airtags be tracked from an iMac desktop, with no iPhone? The grid zones UTM 31N to 37N differ from the standard zone for the Northern Hemisphere, in part to accommodate the southern half of the Kingdom of Norway. Note: Your post will require moderator approval before it will be visible. Copyright 2000-2023 Groundspeak, Inc. DBA Geocaching. This way, if you construct your lon/lat data as a csv with one coordinate pair per line, like. Geodetic datums like the North American Datum 1983 (NAD83) form the basis of coordinates of all horizontal positions for Canada and the United States. For example, USGS topographic maps generally were published using a NAD27 datum. Method: NADCON Why Are Great Circles the Shortest Flight Path? November 18, 2021 called a datum transformation (or coordinate system transformation). To learn more, see our tips on writing great answers. Geodesists developed the NAD83 datum using approximately 250,000 stations. Convertir coordenadas UTM NAD27 a WGS84 en ArcGIS - YouTube 0:00 / 6:33 Introduccin Convertir coordenadas UTM NAD27 a WGS84 en ArcGIS ngel A. Gonzlez 35 subscribers Subscribe 36. . Canadas standard transformation program between NAD27 and NAD83 was developed by the Canadian Geodetic Survey. Click Transform to quickly convert coordinates. National Spatial Reference System and current survey standard using multi-year adjusted locations based on GNSS from the CORS. It provides latitude and longitude and some height information. Click Open Map (appears after the end of the conversion) to visualize the converted coordinates on the World map. If you are looking for online API solution, you can use MyGeodata Cloud API - you can send data in many GIS formats and set transformation to any known projection and conversion to many GIS formats. Powered by EPSG database 10.076, "Uses NADCON method which expects longitudes positive west; EPSG GeogCRS NAD27 (code 4267) and NAD83 (code 4269) have longitudes positive east. Be mindful of geographic transformations and how to choose the right one. In areas of sparse geodetic data coverage, NADCON may yield less accurate results but seldom in excess of 1.0 m. Transformations between NAD83 and the States/Regions with High Accuracy Reference Networks (HARN) introduce approximately 0.05 m uncertainty. See also: Proper gdaltransform syntax to transform a list of coordinates? Some samples are: Easting (Metre): 398676. convert nad27 to wgs84 formula. Since 1986, geodesists have made several updates to NAD83. Select a range of cells. Enter coordinates, select input and output reference system. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? How to convert WGS84 to NAD27 in pygeodesy? You have successfully reported the error, You will get the notification email when error is fixed. This set of horizontal positions formed the basis for the North American Datum of 1983 (NAD83). Short story taking place on a toroidal planet or moon involving flying. or, depending upon your platform, you may use stdin/stdout redirection as follows. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. This page has an example of converting state plane to WGS84: . You cannot convert between Old Hawaiian or Alaskan Island and NAD27 because NADCON does not have the necessary information. The shift to NAD83 affects the Please support me on. The North American Datum of 1927 (NAD27) is one of the main three geodetic datums in North America. I tried using proj4js and proj4php but they cannot do the correct transformation. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. When two datasets are projected into planar coordinates (such as UTM or state plane) and the differences between locations in NAD27 and NAD83 are measured, the y-coordinate is often approximately 200 meters larger than expected. Paste as plain text instead, Clear editor. I've been asked by some users of my Spreadsheet if i could add the the conversion from WGS84 to NAD27. You must log in or register to reply here. This difference is known as a datum shift. Most overview landmarks have not moved. You would need to apply a datum transformation when working with NAD83 data. What am I doing wrong here in the PlotLegends specification? The default NAD27 to WGS84 transformation is NAD_1927_To_WGS_1984_1, . Unfortunately, NAD27 is not a simple mathmatical formula. Coordinates Converter is for converting between coordinate systems with one geodetic datum. UTM (Universal Transverse Mercator) is a coordinate system that is based on the WGS84 ellipsoid. Surveyors and geodesists created a global ellipsoid model because of the enhancement of computing capabilities and GPS technology. Asking for help, clarification, or responding to other answers. Follow these easy steps to disable AdBlock, Follow these easy steps to disable AdBlock Plus, Follow these easy steps to disable uBlock Origin, Follow these easy steps to disable uBlock. Click Add. Connect and share knowledge within a single location that is structured and easy to search. It has been implemented within the Project tool. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. When you combine these measurements, we arrive at a geodetic datum. Due to differences in the method for defining each datum, as well as variations in distortion, the relationship between the NAD27 datum and NAD83 datum cannot be defined at every location by a single mathematical equation. Upload or insert images from URL. Here's an example. This effort, known as HARN or HPGN, is a cooperative project between the National Geodetic Survey and individual states. GDAL/OGR are fairly robust and open source that are made for this. Cartisan Total Map Coordinate Converter does anybody have the Marco for this spreadsheet. I work offshore and dont always have a good internet connection with which to update my apps so I do that from good WiFi before departure. datums. One only has to look as some GPSr's and software to see the number of "different" NAD27 datum conversions to realize it's not a simple mathematical type of conversion. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. You would have to perform a datum transformation if youre using data in NAD83. Am I missing something obvious? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Nearly all published statements about the amount of shift between NAD27 and NAD83 are shifts measured in meters on unprojected (latitudelongitude) data. Continually Operating Reference Stations (CORS) are composed of permanently operating Global Positioning System (GPS) receivers. Connect and share knowledge within a single location that is structured and easy to search. Your link has been automatically embedded. Has 90% of ice around Antarctica disappeared in less than a decade? A datum defines the following parameters for an ellipsoid: The North American datum of 1983 (NAD83) is the current horizontal or geometric datum for the United States. Hi, looks like the Cartisan Total Map Coordinate Converter is no longer available from the website (actually, the whole sites down) geographic transformations and how to choose the right one, 25 Map Types: Brilliant Ideas to Build Unbeatable Maps, Epic Web Maps The Maps Hall of Fame [Best Maps]. rev2023.3.3.43278. In this case, a datum transformation is necessary. Enter a meaningful name under the Info string field. Result is 39.748289809487346 -104.99917122555918. i made the assumption that ellps value unchanged without knowing what extact projection your data is in. Convert from NAD83 to WGS84 is real fast and easy. How can I take a NAD27 decimal coordinate like 39.748303,-104.998634 and convert it to NAD83 or WGS84 with a programming function in PHP or JS? The best answers are voted up and rise to the top, Not the answer you're looking for? Datum shifts happen because survey measurements improve. This difference is known as a datum shift. Learn more about Stack Overflow the company, and our products. A horizontal datum provides a frame of reference as a basis for placing specific locations at specific points on the spheroid. How accurate do you need the transform? Points in other parts of the world will coincide, as there is no offset definition for them. Does anyone know how to do this or where I can find examples on the web? NADCON is the accepted national standard and is the fastest, simplest, and most accurate datum transformation for mapping at scales of 1:200 and smaller. Most survey monuments have not moved. I converted NAD27 to NAD83 and put on google maps and it was about the same as WGS84 (maybe 5-8 ft difference). Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, var functionName = function() {} vs function functionName() {}, Reference Guide: What does this symbol mean in PHP? Required fields are marked *, Datum Transformations Converting Coordinates from NAD27 to NAD83. If I use the Map3D querry method to "draw" the wgs84 linework and cad. This compares to only 26,000 used in the NAD27 datum. How to notate a grace note at the start of a bar with lilypond? 1720. NAD83 corrects some of the distortions from NAD27 over distance by using a more dense set of positions from terrestrial and Doppler satellite data. And even today, people continue to change geodetic datums in an effort to make them more accurate. The National Geodetic Survey relied heavily on the use of the Doppler satellite to locate the Earths center of mass. The geodetic datum is an integral part of projections. When you do click on the datum, it shows various parameters that it uses. Do you have any affiliation with MyGeodata Cloud? You can open imagerywith a world file. Transformations between old datums (NAD27, Old Hawaiian, Puerto Rico, etc.) In order to create a geodetic datum, surveyors undertook a mammoth collection of monument locations in the late 1800s. We reference all coordinates to a datum. Two such methods for transforming between NAD27 and NAD83 have been developed by the United States and Canada for use in their respective countries. Right-click total to add Max, Min, Count, Average. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Because you add the WGS84 data first, the "to" (pulldown) should list WGS84. To see this for yourself, you can create a coverage of a single arc, running along a meridian from the equator to your point of interest in the coterminous United States. The best method these days is using distortion models which I believe is used with things like NADCON, http://www.ngs.noaa.gov/TOOLS/Nadcon/Nadcon.html. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? The tasks of conversion include: WGS84 is intended for global use. These points are in West Texas, where NAD27 differs from WGS84 by about 50 meters. Map Tools was a great little app and I used it quite a bit, especially for datum transforms. NAD 27 and NAD 83 provide a frame of reference for latitude and longitude locations on Earth. Exploring the world of free tools for GIS, GPS, Google Earth, neogeography, and more. And since the beginning of the 19th century, the dimensions of the ellipsoid have been calculated at least 20 different times with considerably different accuracy. If you are converting to or from state plane, use the NAD27 keyword instead. In the top box, select NAD27 if it isn't. The North American Datum of 1983 (NAD83) is the most current datum in North America. The coordinates for benchmark datum points are typically different between geodetic datums. Most historical USGS topographic maps and projects by the US Army Corps of Engineers used NAD27 as a reference system. All files are processed on our servers. No plugin or software installation is required for you.. Powered by Aspose.GIS. Is the Earth Round? Your email address will not be published. Asking for help, clarification, or responding to other answers. Click this link to visit the forums. 3 Answers Sorted by: 6 Did I actually transform my data points from WGS84 to NAD27? Because the Earth is curved and in GIS we deal with flat map projections, we need to accommodate both the curved and flat views of the world. The latitude and longitude location in the NAD27 datum differs from NAD83 or WGS84. Overall, it established a network of standardized horizontal positions in North America. A geodetic datum uniquely defines all locations on Earth with coordinates. But now I cant find it when I search within my apps. I was hoping to see a difference between the two layers, but I saw none. If any of . Farther offshore NAD27 undefined. For example, ArcMap has seven formulas that convert from NAD27 to NAD83. Remarks: Transformation steps are from NAD27 to NAD83 (HARN) (12) (code 8471) assuming that NAD83 (HARN) is equivalent to WGS 84 within the accuracy of the transformation. (I zoomed in to 47:1. SPCS83 (Version 2.1) Converts NAD 83 State Plane Coordinates to NAD 83 geographic positions (latitudes and longitudes) and vice versa. I've been asked by some users of my Spreadsheet if i could add the the conversion from WGS84 to NAD27. Chris, try this link out http://www.gpsu.co.uk/. The latitude and longitude location in the NAD27 datum differs from NAD83 or WGS84. after selecting the coordinate conversion button. For example, the latitude and longitude location in a NAD27 datum differs from that same benchmark in NAD83 or WGS84. var NAD2NAD = function (x,y) { var NAD27= "+proj=longlat +ellps=WGS84 +datum=NAD27 +no_defs"; var NAD83= "+proj=longlat +ellps=WGS84 +datum=NAD83 +no_defs"; return proj4 (NAD27,NAD83, [x,y]); }; your input in NAD27 39.748303,-104.998634, Proj4js returns in datum NAD83 [ -104.998634, 39.74619740515981 ], If you have an account, sign in now to post with your account. I converted NAD27 to NAD83 and put on google maps and it was about the same as WGS84 (maybe 5-8 ft difference). Assigning the CRS does not transform the data. You will get the conversion to result in the Output reference system window. Turn off on-the-fly transformations for you project and load the saved NAD27(BLM14) file in. Sad to see it disappear. The early attempts at measuring the ellipsoid used small amounts of data and did not represent the true shape of the Earth. SPCS DEMs SPCS imagery Because that is incorrect: How to transform data points from WGS84 to NAD27? Why do many companies reject expired SSL certificates as bugs in bug bounties? Transformations between old datums (NAD27, Old Hawaiian, Puerto Rico, etc.) You cannot paste images directly. The NAD 83 realization used for SPCS zones depends on the tectonic plate where it is located: North America and Caribbean plates: NAD 83 (2011) (I never took any GIS classes in school, and I've only been working at this for a few weeks.). The following projection file converts an NAD27 dataset to an NAD83 dataset: The following keywords (and associated regional coverage) are valid datum names when using the NADCON method for datum transformation. There is really no single computation capable of adequately handling that type of conversion (well). Surveyors now rely almost exclusively on the Global Positioning System (GPS) to identify locations on the Earth and incorporate them into existing geodetic datums. En este ejemplo, yo tengo un mapa en NAD27, entonces elegimos este sistema en el botn select coordinate system; este deseo pasarlo a NAD83, este se lo asigno en el siguiente botn del mismo panel (source drawing). Surveyors chose Kansas as a common reference point because it was near the center of the contiguous United States. Your email address will not be published. After, geodesists developed the more accurate NAD 83, which we still use today. In case you have coordinates in CSV file somewhere online, you can call this request: Thanks for contributing an answer to Geographic Information Systems Stack Exchange! I am looking for a programming function that can convert NAD27 coordinates to WGS84. North American Datum of 1983 is based on the reference ellipsoid GRS80 which is physically larger than NAD27s Clarke ellipsoid. The difference between the phonemes /p/ and /b/ in Japanese. A geographic coordinate system (GCS) is a coordinate system associated with positions on Earth (geographic position). How do you ensure that a red herring doesn't violate Chekhov's gun? Have you attempted anything on your own? - Conversion of Coordinates in Decimal Degrees to UTM. The average correction between NAD27 and NAD83 is an average of 0.349 northward and 1.822 eastward. What is the incorrect result for your conversion. Can I tell police to wait and call a lawyer when served with a search warrant? We reference all coordinates on Earth to a datum. I suspect the group that originated the app got bought out or has disbanded. Making statements based on opinion; back them up with references or personal experience. Not really. In surveying and geodesy, we accurately define these properties with geodetic datums. Comments are currently closed; feel free to contact me with questions/issues. Select a popular spatial reference system from the drop-down list or choose a custom system to enter the functioning EPSG code by yourself. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. For any type of work where coordinates need to be consistent with each other, you must use the same geodetic datum. Assuming your original coordinates are actually WGS84, you just assigned an erroneous CRS of NAD27(BLM14) the second time you imported the data. NAD83 corrects some of the distortions from NAD27 over distance by using a more dense set of positions from terrestrial and Doppler satellite data. Newer realizations of NAD83, such as NAD83 (CORS96) and NAD83 (2011) can differ from NAD83 (1986) by a meter or so. The input data is actually on the Old Hawaiian datum. convert nad27 to wgs84 formula. Remarks: Parameter file is from NAD27 to NAD83 (4) (code 1313) assuming that NAD83 is equivalent to WGS 84 within the accuracy of the transformation. In near offshore regions, results will be less accurate but seldom in excess of 5.0 m. Farther offshore, NAD27 was undefined. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Click on the "Convert" button. However, many of you might have automated your original data layers using NAD27 and continue to do so, primarily because some source data is collected from maps based on NAD27. The GRS80 reference ellipsoid has a semi-major axis of 6,378,137.0 meters and a semi-minor axis of 6,356,752.3 meters. If you can read C source code (not that hard), I have a program (with the source code included) on my Web site (http://jdmcox.com), named Convert SDTS Data, that converts from NAD27 to NAD83 (I know, you want to convert in the opposite direction (retrogression?). It only takes a minute to sign up. To transform datums, specify different input and output datums with the DATUM subcommand in a projection file. 9874) instead of degrees, minutes, and seconds (-73 59' 14. . What is the correct way to screw wall and ceiling drywalls? However, because the geodetic datums were different, the resulting projected coordinates will also be different. Conversions between NAD27 and NAD83. Asking for help, clarification, or responding to other answers. A datum defines the radius, inverse flattening, semi-major axis, and semi-minor axis for an ellipsoid. Depending on where you are in North America, NAD27 and NAD83 may differ in tens of meters for horizontal accuracy. If the figures will always be the same numbers of characters, and the points always in the same relative positions then this formula will do the job: Code: =LEFT (A2,2) &"."&MID (A2,3,8)&"."&RIGHT (A2,4) I put your example data in A1, hence the reference. There is no exact mathematical equation that will convert data built from a surface oriented local datum like NAD27, to an earth centered global datum like NAD83. Get your coordinates in the WGS84 on your display. Assigning the CRS does not transform the data. Here is the spatial reference list. proj4js cannot transform nad27 datums to nad83 correctly. Do new devs get fired if they can't solve a certain bug? At each station, surveyors collected latitudes and longitude coordinates. If you want to use PHP, you could use Proj4PHP. Any you already have installed. http://everest.hunter.cuny.edu/mp/software.html. In this case, a datum transformation is necessary. Before the current datum was defined, many maps were created using different starting points. http://everest.hunter.cuny.edu/mp/software.html ", "United States (USA) - Delaware and Maryland. Did I actually transform my data points from WGS84 to NAD27? If so, shouldn't I see a discrepancy? Canada - Quebec. But given that the datum of the coordinate matches the datum used on the map, you will see no difference in the physical location. In near offshore regions, results will be less accurate, but seldom in excess of 5.0 meters. http://www.ngs.noaa.gov/cgi-bin/nadcon.prl. Before the current datum, cartographers created maps using different starting points. ncdu: What's going on with this second size column? It is known locally as the National Transformation and will be referred to in this document and the software as the Canadian National Transformation. Surly Straggler vs. other types of steel frames. However, because the geodetic datums were different, the resulting projected coordinates will also be different. Remarks: Transformation steps are from NAD27 to NAD83(HARN) (12) (code 8471) assuming that NAD83(HARN) is equivalent to WGS 84 within the accuracy of the transformation. NAD27 to HARN equals 0.15m + 0.05m = 0.20m). - Conversion of Coordinates in Degrees, Minutes and Seconds to Decimal Degrees. What video game is Charlie playing in Poker Face S01E07? Making statements based on opinion; back them up with references or personal experience. This would be acceptable for my purposes. NAD27 uses all horizontal geodetic surveys collected at this time using a least-square adjustment. Earth bulges out more at the equator than at the poles by about 70,000 feet. It appears after finishing the conversion process. You should see the difference between the projections, i.e. It provides latitude and longitude and some height information using the reference ellipsoid GRS80. High Accuracy Reference Network (HARN) and High Precision Geodetic Network reworked geodetic datums from 1986 to 1997. I'm trying to fix NAD27 points on Google maps as they're all off by like 150 ft. It only takes a minute to sign up. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Even today, geodesists are continually improving horizontal geodetic datums. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. November 18, 2021 | | premier league goalkeeper rules | crewe homecoming 2021 Open Source GIS: A GRASS GIS Approach - Page ii UTM <-> Latitude/Longitude online converter Convert nad27 to decimal degrees" Keyword Found Websites . DWalsh wrote: > > Hi Rod, > Does a summoned creature play immediately after being summoned by a ready action? I wonder if the developer of this app has folded andits no longer available. You can also convert coordinates using many other spatial references. NAD_1927_To_NAD_1983_Alaska. Datums precisely specify each location on Earths surface in latitude and longitude. From the unified network of survey monuments, the result of triangulation was the North American Datum of 1927 (NAD 27). JavaScript is disabled. you should have the on-the-fly projection setting turned on this could be the answer to the discrepancy question. rev2023.3.3.43278. This has led to the development of global ellipsoid models such as WGS72, GRS80, and WGS84 (current). File is in the .RAR compression format; if your unzipping program cant handle that, try 7-Zip. Or is there a QGIS or (better) an OSGeo solution? NAD 27 and NAD 83 provide a frame of reference for latitude and longitude locations on Earth. NOAAs National Geodetic Survey used these survey stations and triangulation to form the NAD27 datum. Copyright 2000-2023 Groundspeak, Inc. DBA Geocaching. Why does Mister Mxyzptlk need to have a weakness in the comics? Proj4php is an OSGeo community project. Earth bulges out more at the equator than at the poles by about 70,000 feet. Has 90% of ice around Antarctica disappeared in less than a decade? NAD_1927_To_NAD_1983_6. How to convert MTM coordinates to WGS84 with R? For application in Gulf of Mexico refer to IOGP report 373-26. Solo digan como se convierten y no nos manden a otro sitio a seguir gastando el tiempo. The first geodetic datum adopted for the United States was based on the Clarke ellipsoid with its starting point in Kansas known as Meades Ranch. Surveyors connected each monument location using mathematical techniques like triangulation. From the unified network of survey monuments, the result of triangulation was the North American Datum of 1927 (NAD 27). All Rights Reserved. Surveyors installed brass or aluminum disks at each reference location. The photo shown is a benchmark, not a triangulation station. Macro/VBA to add text from another cell into current cell when I type a certain value. A common problem is when different coordinate locations are stored in different reference systems. Location of data. Aqu pueden convertir las coordenadas UTM de NAD27 A WGS84 y viceversa: http://www.xpmexico.com/index.php?module=xpcoord&func=displayresults Douglas Buitrago noviembre, 2012 at Mucho Bla Bla y nadie sabe como convertir wgs84 a nad27 o biceversa ???? United States (USA) - Delaware and Maryland. Or convert them to any other coordinate I can map onto tableau. When you need to accurately enter latitude and longitude coordinates in a GIS, the first step is to give it a datum. Get your coordinates in the WGS84 on your display. Therefore, the Nadcon computed transformations are extrapolations and no accuracy can be stated." Thanks, Rod. A number of methods have been proposed for performing the datum adjustment. Input the coordinates in a decimal degrees (DD) format. (i.e. NAD27 coordinates are presently used for broadcast authorizations Depending on where you are in North America, NAD27 and NAD83 may differ in tens of meters for horizontal accuracy. Theoretically Correct vs Practical Notation. To permanent project just do a right click on your data layer in QIGS>Save as>CRS choose the CRS you want. none. Datum Transformations Converting Coordinates from NAD27 to NAD83, 25 Map Types: Brilliant Ideas to Build Unbeatable Maps, Ocean Currents Map: Visualize Our Oceans Movement, 3 Wildfire Maps: How to Track Real-Time Fires Around the World. NAD27 was not used officially in Hawaii or the Alaskan islands. Making statements based on opinion; back them up with references or personal experience. Disconnect between goals and daily tasksIs it me, or the industry? A datum describes the shape of the Earth in mathematical terms. When combining data from different users or eras, it is important to transform all information into common geodetic datums. As the name implies, datum transformations transform your data from one datum to another. After, geodesists developed the more accurate NAD 83, which we still use today. Unfortunately, NAD83 is not the only datum youll encounter. Click "Open Map" (appears after the end of the conversion) to visualize the converted coordinates on the World map. convert nad27 to wgs84 formula. Is it correct to use "the" before "materials used in making buildings are"? OKMap GPS Mapping Software For The Beta-Adventurous, Spreadsheet Tools For Lat/Long, MGRS and UTM Coordinate Conversions, Degree-Minute-Second To Decimal Degree Converter, Coordinate Converters III Two Freeware Converters, Coordinate Converters I NAD Conversions, Options For MGRS Coordinate Conversion And Viewing. This converts between NAD27 and NAD83 (1986) using the NADCON transformation. Steps of transformation: Area of use: United States (USA) - Delaware and Maryland. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Similar to NAD 83, it uses the Earths center mass as the coordinate origin. Have you research the problem? It may not display this or other websites correctly. But where can I find the origin alignment, axis rotation, and scale information that will allow me to relate Clarke 1866, GRS80, and WGS84? a mammoth collection of monument locations, mathematical techniques like triangulation, NOAAs National Geodetic Survey used these survey stations and triangulation. I know QGIS could do the conversion, but I need a function for my purposes. It runs with any browser on any device. Bessel 1841 was used before Clarke 1866 was adopted because it was based on observations of triangulation arcs of North America. Using QGIS, I loaded my shapefile into one layer and set the CRS to WGS84, then I loaded the same data again and set its layer to NAD27.
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