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A client has provided some surveyed points referenced to the "BALTIMORE CITY SURVEY CONTROL SYSTEM", they're all projected and given in easting/northing numbers. I need to reconcile them with some GPS coordinates I have in the NAD83 (2011).

I'm new to the GIS world, and really don't want to ask the client any stupid questions, but I can't figure out what the transformation is going to be.

Should I ask them for an EPSG code?

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    What GIS software are you using? What do you mean by points, a table, a shapefile etc.? – BERA Nov 10 '17 at 14:10
  • I'm using the Trimble suite, TBC specifically. The points are just north, east, elevation coordinates in a spreadsheet. – Ben J. Nov 10 '17 at 14:46
  • You need to know the coordinate system of the survey Points (name or EPSG code) – BERA Nov 10 '17 at 14:50
  • It seems that the Baltimore County adopted the Maryland Coordinate System, North America Datum of 1983. So it should be EPSG:6487 (meters) or EPSG:6488 (US survey feet). – Antonio Falciano Nov 10 '17 at 15:28
  • Info here: archive.baltimorecity.gov/OfficeoftheMayor/MayoralOffices/… . Note: city of Baltimore system is not in EPSG. It's also in spatialreference.org . If you're not using Esri, you may have trouble converting the definition into something that can be used. – mkennedy Nov 11 '17 at 1:11
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As commented by @mkennedy:

Info here: http://archive.baltimorecity.gov/OfficeoftheMayor/MayoralOffices/InformationTechnology/EnterpriseGeographicInformationServices/PublicAccessData.aspx . Note: city of Baltimore system is not in EPSG. It's also in spatialreference.org . If you're not using Esri, you may have trouble converting the definition into something that can be used.

and @AndreJ:

(Almost) all free tools are based on PROJ.4, but nobody has taken care of the Baltimore CSCS yet, because it is not on the EPSG database.

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