How to convert latitude and longitude (Spatial Reference wkid: 4326) to ArcGis Coordinates (Spatial Reference wkid: 23033)?

[BrianCachia]

I have already tried with the GeometryService project method passing parameters like outSR as wkid : 23033 (the one we are using for our map) and geometries that contains geometris with spatialReference wkid : 4326.

The end result is that the points are being shown with quite an offset from the original position compared to Google Earth or Google Maps.

[NeilAyres · Accepted solution]

WKID 4326 is GCS_WGS84 - geographic cords based on the WGS84 datum.

WKID 23033 is ED_1950_UTM_33N. A projected UTM coordinate system based on the European datum.

You will need a transformation from one datum to the other to get them to match up.

There are a whole bunch of these available depending on your area of use.

See pages 12-13 of the pdf geographic_transformations in the documentation area of the install.

[BrianCachia]

I was not using any transformation and there was the problem. For anyone that goes through this problem as well, make sure that you use a correct datum transformation for your area. Also there is a "transformForward" parameter in the ProjectParams object that indicates in which direction one should transform the coordinates.

Thanks for the help.