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Grid Coordinates to Ground Coordinates

  • December 18, 2019
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deanhowell
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Hello all,

I am trying to automate the output of GIS data from PostGIS to Autocad DWG. The base data is in geographic coordinates (lat / long) and I have been able to successfully create the output DWG in GDA2020 UTM Zone 52, 53 or 54.

The problem is that the end users need the data in ground coordinates not grid but I am not sure how to define a custom projection to either take it from geographic to ground or from geographic to grid to ground.

I have been able to find the formula for the scale factor but this is something that will change for each extract of the data.

Does anyone have any advice on the best way to create a new projection on the fly using the newly defined scale factor?

Best answer by deanhowell

Hello all, I am not sure it is the best solution but what I have done is project the data to the correct UTM and then use the scaler transformer to scale the entire drawing by the calculated scale factor.

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3 replies

nielsgerrits
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Not sure if I understand correctly, do you want reproject you data from a geographic (degrees) system to a projected (metres) system?

deanhowell
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  • December 18, 2019
nielsgerrits wrote:

Not sure if I understand correctly, do you want reproject you data from a geographic (degrees) system to a projected (metres) system?

Thanks but not quite it is basically converting / scaling the data to closer represent ground distances . Surveyors will add a scale factor when they survey boundaries to take from Eastings and Northings to a scaled Eastings and Northings

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deanhowell
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  • deanhowellInfluencer
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  • December 18, 2019

Hello all, I am not sure it is the best solution but what I have done is project the data to the correct UTM and then use the scaler transformer to scale the entire drawing by the calculated scale factor.

FME - My go to no code development tool

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