Results 1 to 4 of 4

Thread: Defining a local coordinate system

  1. #1
    Member
    Join Date
    2003-06
    Posts
    10
    Login to Give a bone
    0

    Question Defining a local coordinate system

    The coordinate system currently in use by the City I work for is a ground scale system derived from a State Plane coordinate system based on a Lambert conformal conic projection. The conversion is done by scaling the State Plane coordinates by an average combined grid factor (the City is small & flat so one factor works for the everything) then moving the whole system 1,000,000 ft.
    Problem: I want to define this local system so that it can be assigned to a map & conversions of maps on other systems can be done accurately when they are queried in and the track coordinate function can be used. The false northing of the State Plane system is 0.00 so scaling is the problem.
    Any ideas?

  2. #2
    AUGI Addict
    Join Date
    2015-12
    Location
    Arizona
    Posts
    2,375
    Login to Give a bone
    0

    Default Re: Defining a local coordinate system

    You will need to use the MAP>>Tools menu item
    Define Global Coordinate System
    This is where you would enter the details of your Localized
    coordinate system.

  3. #3
    Member
    Join Date
    2003-06
    Posts
    10
    Login to Give a bone
    0

    Default Re: Defining a local coordinate system

    I have been there, done that. The problem is, I'm trying to match to the existing coorinate system I described. There would be no problem if I were establishing a new coordinate system. I'm searching for a mathematical solution rather than trial & error to solve the problem of scaling the false northing at the origin.

  4. #4
    Civil Engineering Moderator MHultgren's Avatar
    Join Date
    2000-12
    Location
    Central Iowa
    Posts
    1,431
    Login to Give a bone
    0

    Default Re: Defining a local coordinate system

    I would contact the City Surveyor to find out the settings that are used for the CS. If they want things in their system, they should be able to tell you what the settings should be.
    Mark Hultgren
    Just a Lurker
    http://www.MKW-Ind.com
    Blog
    Socializing??

Similar Threads

  1. 2015: coordinate system
    By rmk in forum AutoCAD General
    Replies: 0
    Last Post: 2015-03-27, 09:33 PM
  2. Replies: 0
    Last Post: 2011-01-25, 05:59 AM
  3. Problems defining Global Coord System
    By jzampardi in forum AutoCAD Civil 3D - General
    Replies: 1
    Last Post: 2009-09-28, 01:25 AM
  4. Transforming local coordinate systems
    By malfan in forum Geospatial - General
    Replies: 0
    Last Post: 2009-05-13, 03:41 PM
  5. Coordinate System
    By mccurdyks in forum Revit Architecture - General
    Replies: 7
    Last Post: 2006-06-21, 05:05 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •