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Problem converting projected coordinates to webmercator

Question asked by clindholm on Aug 22, 2012
Latest reply on Oct 11, 2017 by pml

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Hi,

I'm having a problem converting my coordinates in the Finnish KKJ2 coordinate system (i.e. Finland_Zone_2, wkid 2392) to webmercator in order to plot points on my map.

I am trying to do this with the code

esri.geometry.geographicToWebMercator(new esri.geometry.Point(east, north, new esri.SpatialReference(2392)))

,

No matter what spatial reference I put in the code, it appears that arcgis assumes the coordinates are given in WGS84. It does not matter what wkid i put in my code, my points end up on the exact same location on the map regardless of the wkid.

Where should I start looking for a solution?

BR
-Christian

dlimos Aug 27, 2012 11:42 PM

Correct Answer

I think that you should use a geometry service

http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/util_project.html

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johnny.penet-esribelux-com-esridist Aug 22, 2012 3:31 AM

Hi Christian,

I am not sure there is an easy way in Javascript for converting local geographic coordinates into projected coordinates. Having problems of converting WGS84 to Lambert 72 (31370), I wrote a number of javascript methods that did the job. One of the methods was the conversion between geographic and projected coordinates for Lambert 72. I think you will need something simular.
After some research, I used the conic conformal 2SP (Belgium) method, you will need 'JHS formulas' that can be found in the document http://www.epsg.org/guides/docs/G7-2.pdf

You can find a lot of documentation and code on a blog I wrote concerning conversions of projections in Javascript. First document is about the architecture. Second document contains the code. I hope the documents are easy readable.

http://jpenet.blogspot.be/2012/08/transformation-between-datums-in.html

Johnny

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clindholm Aug 27, 2012 10:24 PM

Thanks for the reply. I was hoping for a more ready built solution :)

I managed to use some of the examples available on the ArcGIS site in order to convert my coordinates.

-Christian

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dlimos Aug 27, 2012 11:42 PM

I think that you should use a geometry service

http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/util_project.html

2 people found this helpful

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pml Oct 11, 2017 5:08 AM

Is it possible to output coordinates other than Web Mercator or WGS 1984 latitude / longitude with the Javascript API, not using a geometry service? esri/geometry/webMercatorUtils offers the Web Mercator and WGS 1984 conversions. I am interested in outputting coordinates to a projected state plane system. I briefly looked over the documentation but did not find an answer.

Here is the documentation for the webMercatorUtils (version 3.x)

esri/geometry/webMercatorUtils | API Reference | ArcGIS API for JavaScript 3.22

Thank you for any help,

Paul Lohr

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johnny.penet-esribelux-com-esridist Aug 22, 2012 3:31 AM
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Correct Answer
Hi Christian,

I am not sure there is an easy way in Javascript for converting local geographic coordinates into projected coordinates. Having problems of converting WGS84 to Lambert 72 (31370), I wrote a number of javascript methods that did the job. One of the methods was the conversion between geographic and projected coordinates for Lambert 72. I think you will need something simular.
After some research, I used the conic conformal 2SP (Belgium) method, you will need 'JHS formulas' that can be found in the document http://www.epsg.org/guides/docs/G7-2.pdf

You can find a lot of documentation and code on a blog I wrote concerning conversions of projections in Javascript. First document is about the architecture. Second document contains the code. I hope the documents are easy readable.

http://jpenet.blogspot.be/2012/08/transformation-between-datums-in.html

Johnny
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clindholm Aug 27, 2012 10:24 PM
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Thanks for the reply. I was hoping for a more ready built solution :)

I managed to use some of the examples available on the ArcGIS site in order to convert my coordinates.

-Christian
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dlimos Aug 27, 2012 11:42 PM
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I think that you should use a geometry service

http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/util_project.html
2 people found this helpful
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pml Oct 11, 2017 5:08 AM
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Is it possible to output coordinates other than Web Mercator or WGS 1984 latitude / longitude with the Javascript API, not using a geometry service? esri/geometry/webMercatorUtils offers the Web Mercator and WGS 1984 conversions. I am interested in outputting coordinates to a projected state plane system. I briefly looked over the documentation but did not find an answer.

Here is the documentation for the webMercatorUtils (version 3.x)
esri/geometry/webMercatorUtils | API Reference | ArcGIS API for JavaScript 3.22

Thank you for any help,
Paul Lohr
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