reproject map extent using geometry service

Permanently deleted user

15. August 2011 22:52

My corporate data is published in geographic coordinates (nad 83, decimal degrees) but my application is in web mercator.  When I retrieve the featureset from the map server to set the extent I will need to do two things:

union all the returns

get the extent of the unioned returns, then re-project the extent to web mercator.

I am doing this in a workflow.  Is there a sample or can anyone provide me the syntax for:

union the returns and get the extent

reproject the extent from geographic to web mercator using a geometry service.

Jeff

 

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  Permanently deleted user

  26. August 2011 05:59

  To union the contents of a featureSet:

  1. Use a foreach loop to add each component graphic of the featureSet to a Collection<Graphic>

  2. Use the Collection<Graphic> as input to the UnionTask, and put the results in a ESRI.ArcGIS.Client.Geometry.Geometry variable. (note: although a featureSet is a collection of Graphics, and the UnionTask appears to ask for a featureSet, it will not accept one. Yes, this is a bug.)

  3. Your geometry variable can now give you the extent -- geometry.Extent

  To reproject to Web Mercator:

  ?1. Create a new instance of the ESRI.ArcGIS.Client.Projection.WebMercator class. It needs to be initialized to a default value: new ESRI.ArcGIS.Client.Projection.WebMercator()

  2. Now you can use it to reproject a geometry in geographic coordinates to WebMercator. Say you called your instance 'project' -- then the syntax would be project.FromGeographic(geometry). A ToGeographic method is also available.

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  Permanently deleted user

  10. Juli 2014 01:34

  Does anyone have a workflow example using projections, it would be very helpful in undestanding.

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