A similar question was asked on this list not so long ago. You may want to look at this thread:http://osgeo-org.1560.x6.nabble.com/Question-On-quot-BallPark-Transform-quot-td5431149.html#none
-Thayer ===================================================Message: 1 Date: Sat, 2 May 2020 13:45:44 +0930 From: Rick Bishop <[email protected]> To: "[email protected]" <[email protected]> Subject: [Qgis-user] FW: Help with georeferencing AGD66 Topo map Message-ID: <[email protected]> (added by [email protected]) Content-Type: text/plain; charset="utf-8" Hi- I am seeking help with this. I have been trying without success for a while to georeference a topo map that is in Australian Geodetic Datum 1966, using both EPSG: 20250 and EPSG :4202. I think 20250 is preferred. I have been successful with similar maps that use WGS 84, but can’t work this one out. I am figuring this out /doing this in my spare time for ametuer use in Avenza by the local bushwalking club. Attached are screen shots • Error message is about a Ballpark transformation. Also says : Used a ballpark transform EPSG: 4202 to EPSG: 3426 • Project Properties • Transformation settings • GCP table -as with previous success maps I am using the UTM Grid for coordinates: Example 501000 / 8258000 • Map Info Map details are Beasley Knob 4766 3 which I downloaded here: GeoScience Aust 1:50 Maps So any guidance appreciated- I image it’s a simple mistake. Kind regards
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