topic Re: Coordinate system transformation is backwards in Geoprocessing Questions

Coordinate system transformation is backwards

LaurenFagg — Mon, 22 Aug 2011 02:54:19 GMT

Hi All,

I was hoping that someone else has run across this problem OR that someone out there can test it and see if they come across the same issue.

I have a 1000mx1000m grid in GDA94, MGA zone 56. I wanted to re-project it into AGD66 AMG Zone 56 so that I could georeference an old topographic map.

Using the Project tool in Arcmap, using any of the provided AGD66 to GDA94 transformations, produced a grid that was shifted the correct distance, but south west instead of North east!

Any comments or similar findings would be welcome. (If this is a real bug I will report it to ESRI)

Re: Coordinate system transformation is backwards

MelitaKennedy — Tue, 23 Aug 2011 20:17:22 GMT

Hi All,

I was hoping that someone else has run across this problem OR that someone out there can test it and see if they come across the same issue.

I have a 1000mx1000m grid in GDA94, MGA zone 56. I wanted to re-project it into AGD66 AMG Zone 56 so that I could georeference an old topographic map.

Using the Project tool in Arcmap, using any of the provided AGD66 to GDA94 transformations, produced a grid that was shifted the correct distance, but south west instead of North east!

Any comments or similar findings would be welcome. (If this is a real bug I will report it to ESRI)

Hi Lauren,

That's generally what I would expect for the change in direction. Don't forget the the older map grid has "even" values--you're not going to match that grid by using "even" values in GDA94 and transforming it back to AGD66. Can you tell me more specifically where the data's located? I may then be able to check against the appropriate state transformation program.

Melita

Re: Coordinate system transformation is backwards

fikriirvan — Mon, 20 May 2024 11:59:00 GMT

Hi Melita,

the same case happened to me. I want to georeference the 1970 PNG map. Based on the legend, this map uses the horizontal datum AGD66. I have changed the project according to the description but it still fails when entering x,y.

is there any suggestion how to use AGD66 in ArcGIS pro?.
*map info is in the following link https://openresearch-repository.anu.edu.au/handle/1885/287479