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Coordinate Reference Systems

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There is ... still ... confusion regarding the proper use of the  Define Projection Tool versus the Project Tool.    "my data don't line up..." "I am sure about the coordinate system..." "everything is far apart onscreen..."   We have all been there.  The written descriptions don't seem to catch on, so a visual guide might be what is needed.… (Show more)
Where can I go to learn more about transformations like the following?   NAD_1983_To_WGS_1984_5 (1515) WGS_1984_(ITRF00)_To_NAD_1983 (108190)   None of them are in the EPSG database according to
in Coordinate Reference Systems
I would like to create a .prj file in order to exchange data between CAD and GIS. For references, I have 9 ground control points in both the local grid and SPCS NAD83 equivalent and a table with the following values from the surveyor. Projection Type: Lambert Conformal Conic 2 Parallel False Northing: 1000000 usft False Easting: 3000000 usft… (Show more)
in Coordinate Reference Systems
Click to view contentThis is a publication by @JimBaumann in ARCUSER.   In 2008, the National Geodetic Survey (NGS) announced in its 10-year plan the replacement of the country’s two national datums: North American Datum of 1983 (NAD 83), the geometric datum used mainly for horizontal positions, and the North American Vertical Datum of 1988 (NAVD 88), the vertical… (Show more)
Looking for more information about the optional install of coordinate systems. The What's new document for Desktop 10.5 document says this: ArcGIS Coordinate Systems Data—Contains the data files required for the GEOCON transformation method and vertical transformation files for the United States (VERTCON and GEOID12B) and the world (EGM2008).… (Show more)
in Coordinate Reference Systems
I am running ArcGIS 10.6.1 on a Windows 10 machine. I am trying to locate where the coordinate system datasets are located. I am trying to visually see which coordinate system will work for a proposed project. Thanks...
in Coordinate Reference Systems
I have several FDS that are set to Nad State Plane South (WKID: 2253) that I want to project to WGS 84 WEb Mercator (WKID: 3857). I have been using the NAD_1983_to_WGS_1984_5 transformation. This was working for a while but now my WGS datasets are drawing about 3 feet off of where the points were. I didn't change any of the parameters in my GP… (Show more)
in Coordinate Reference Systems
I have a raster in NAD83 CA State Plane Zone II (US feet) that I need to project to NAD83 CA Teale Albers (US feet).  When I run the project raster tool, the false northing on the output raster changes from -4,000,000 (what it should be per the .prj file) to -13,123,333.3333.  The difference between the two numbers is a factor of 3.28 so my guess… (Show more)
in Coordinate Reference Systems
I have delineated the watershed using different type of DEM(SRTM 30m, ASTER 30m, CARTOSAT 10m and Hybrid DEM 10m ). I have to validate Which one derived Watershed are accurate? How can i check the accuracy of watershed is good from the another three DEM data.
in Coordinate Reference Systems
Hello,   I am using ArcMap 10.4.1. I have a need to know the likely vertical datum used with the UTM83, zone 16, projected horizontal datum, and have to ask if there is a table of horizontal datums matched to their corresponding vertical datum for a particular date?  I know NGS has many sites dedicated to just a particular geoid or ellipsoid but… (Show more)
in Coordinate Reference Systems
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