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UTM to Ground

dmerrick
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Hi,

 

I have been trying to figure out how to correct reproject from UTM to Ground. I have many datasets in an SDE environment (WKID: 26910) that I want to convert to Autocad DWG format so the engineers can use the data without shifting to local reference points.

Dataset Coordinate System:

NAD_1983_UTM_Zone_10N WKID: 26910 Authority: EPSG

Projection: Transverse_Mercator False_Easting: 500000.0 False_Northing: 0.0 Central_Meridian: -123.0 Scale_Factor: 0.9996 Latitude_Of_Origin: 0.0 Linear Unit: Meter (1.0)

We have a trimble unit that GPS's in Ground with the following Projection settings:

Zone Parameters:

Zone Record: 10 North

 

Zone Type: Transverse Mercator

 

Origin Lat: 0 00'00.000" N

 

Origin Lng: 123 00'00.00 W

 

Origin North: 0.00

 

Origin East: 500,000.000

 

Origin Scale 0.9996000

Project Azimuth: North Azimuth

 

Coordinate Direction: North East

 

 

Datum Parameters:

 

Datum Name: Nad 1983 (Canada)

 

Translation X: 0.000m

 

Translation Y: 0.000m

 

Translation Z: 0.000m

 

 

Ellipse Parameters:

 

Ellipse Name: Geodetic Ref System 1980

 

Ellipse a: 6,378,137.000m

 

Ellipse 1/f: 298.257221538

I have been using the SAFE

 

https://demos-safe-software.fmecloud.com/fmedatastreaming/Coordsys/Start.fmw?

 

To try to create the correct coordinate system for my conversion but the best I can get is 250m away from where it should be.

Any help would be appreciated?

 

Thanks!

Best answer by dmerrick

@deanhowell after going back over the data with the engineers, what they wanted (coordinate system in ground), all I had to use was the Scaler transformer (Scale Origin at 0,0) to convert the data.

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9 replies

daveatsafe
Safer
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  • daveatsafeSafer
  • Safer
  • July 20, 2018

Hi @dmerrick,

FME can automatically generate a local Azimuthal Equal Area coordinate system from your data and write that to the DWG file along with the data, using the CommonLocalReprojector transformer.

If you want more control over the location of the origin, you can also define a local Azimuthal Equal Area coordinate system through the web page, and reproject from UTM into that coordinate system before writing to DWG.

Both of these methods are fairly simple in FME, and would give you a more reliable result than trying to scale the UTM data, since the applicable scale factor changes with the distance from the central meridian.

deanhowell
Influencer
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  • deanhowellInfluencer
  • Influencer
  • December 18, 2019

Hello @dmerrick, I am trying to do the same thing (UTM Zone 53 to Ground) and was just wondering if you solved the problem.

FME - My go to no code development tool
deanhowell
Influencer
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  • deanhowellInfluencer
  • Influencer
  • December 18, 2019
daveatsafe wrote:

Hi @dmerrick,

FME can automatically generate a local Azimuthal Equal Area coordinate system from your data and write that to the DWG file along with the data, using the CommonLocalReprojector transformer.

If you want more control over the location of the origin, you can also define a local Azimuthal Equal Area coordinate system through the web page, and reproject from UTM into that coordinate system before writing to DWG.

Both of these methods are fairly simple in FME, and would give you a more reliable result than trying to scale the UTM data, since the applicable scale factor changes with the distance from the central meridian.

Hello @daveatsafe do you have any examples or advice on this as I am trying to do a similar thing to @dmerrick. We want to be able to create an AutoCAD DWG that is in ground coordinates so the drafting team does not have to apply any transformation. The data is in grid coordinates using GDA2020 Zone 53 and we want to apply the transformation in FME to output the drawing in ground coordinates.

FME - My go to no code development tool
daveatsafe
Safer
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  • daveatsafeSafer
  • Safer
  • December 18, 2019
deanhowell wrote:

Hello @daveatsafe do you have any examples or advice on this as I am trying to do a similar thing to @dmerrick. We want to be able to create an AutoCAD DWG that is in ground coordinates so the drafting team does not have to apply any transformation. The data is in grid coordinates using GDA2020 Zone 53 and we want to apply the transformation in FME to output the drawing in ground coordinates.

Hi @deanhowell,

Please try sending the data through the CommonLocalReprojector before writing it to AutoCAD.

dmerrick
Contributor
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  • dmerrickContributor
  • Author
  • Contributor
  • December 18, 2019
deanhowell wrote:

Hello @dmerrick, I am trying to do the same thing (UTM Zone 53 to Ground) and was just wondering if you solved the problem.

Hi @deanhowell, I had forgotten about this project (the Engineers shift/factor the data on their end), I will have another look at it.

deanhowell
Influencer
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  • deanhowellInfluencer
  • Influencer
  • December 18, 2019
daveatsafe wrote:

Hi @deanhowell,

Please try sending the data through the CommonLocalReprojector before writing it to AutoCAD.

Thanks @daveatsafe I will give that a go :)

FME - My go to no code development tool
dmerrick
Contributor
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  • dmerrickContributor
  • Author
  • Contributor
  • Best Answer
  • December 20, 2019

@deanhowell after going back over the data with the engineers, what they wanted (coordinate system in ground), all I had to use was the Scaler transformer (Scale Origin at 0,0) to convert the data.

dmerrick
Contributor
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  • dmerrickContributor
  • Author
  • Contributor
  • December 20, 2019
deanhowell wrote:

Hello @dmerrick, I am trying to do the same thing (UTM Zone 53 to Ground) and was just wondering if you solved the problem.

@deanhowell after going back over the data with the engineers, what they wanted (coordinate system in ground), all I had to use was the Scaler transformer (Scale Origin at 0,0) to convert the data.

deanhowell
Influencer
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  • deanhowellInfluencer
  • Influencer
  • December 21, 2019
dmerrick wrote:

@deanhowell after going back over the data with the engineers, what they wanted (coordinate system in ground), all I had to use was the Scaler transformer (Scale Origin at 0,0) to convert the data.

Thanks that is what i did as well but the change to ground was so small that it didn't seem necessary but does seem effective once the scale factor was worked out. Thanks again

FME - My go to no code development tool

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