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Coordinate Reference Systems

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All,   I am using ArcMap 10.4.1.   I see many engineers using MSL, but I believe, should be using NAVD88 as a vertical datum.  I imagine there must be a rule of how many miles upland (distance from gauge) the sea level gauge is good for.  Does anyone know how far upland one can make use of Mean Sea Level accurately, before having to switch to… (Show more)
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Hi,   I need help on understanding the logic in setting up and using custom geographic transformations in ArcGIS Pro. I think I've read everything I was able to find online incl. several issues here on GeoNet. I would like to take advantage of a Custom Geographic Transformation in the "Project"-geoprocessing tool or as an alternative in the "Copy… (Show more)
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Hi    I have a asci file and trying to convert into a byn. file (Natural resources Canada) geoid file . Does anyone know a tool that can help for it?   Thank you
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We have a need to convert several coordinate systems from ESRI's .prj to the PROJ4 standard. Is there a way to do this without scripting? I have found resources online that detail python scripts but I was wondering if anyone knew of another way to convert these coordinate systems so they can be used in another software (for geotech) along side Arc.… (Show more)
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Does anyone know where I can find the equation to put into Excel that will convert CT State Plane coordinates to Lat/Lon?  I know ways to programmatically do this using ArcGIS but have a scenario/workflow where we may need to do this from within Excel.  Thanks!
Custom Transformation only seem to work in the map view but the user cannot apply the custom transformation when exporting/copying the data :-( In ArcMap the user is asked whether or not to use the coordinate system definition of the data frame when exporting and in this case the data gets transformed but unfortunately this doesn't seem to work in… (Show more)
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Hi All   I have created a Geoform that is filled out in the field. The data is then downloaded and added into arcmap 10.3 as a .csv before being saved as a layer file.   When the data is online it shows to be in the correct locations over our maps however once the data has been downloaded as a .csv and is then added to our map the data shows to… (Show more)
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I add an excel spreadsheet with x y coordinates, and it successfully imported.  The problem is it hasn't set to the exact location on my map.  In fact I suspect the projection is off because it appears to be in a white no-mans-land with a white background.  My map uses an imported online esri basemap.   Suggestions?
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Yet another XY out of place question.   Imported Excel table with XY coordinates. Coordinate system for point layer is the same as the data frame.   When XY event is created in ArcMap points are about 150 miles from where they should be. When XY are plotted in Google Maps they are in the correct position.   It's been a long day and can't… (Show more)
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If I zoom to layer for the table of data, I can see that it is in the correct spread for what it is meant to look like, but it is at such a small scale that it looks like one point when viewed at the scale of the map. Also, it is supposed to be in Maine, but is clustered in the dead center of the map, off the coast of West Africa. Any tips on what… (Show more)
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