How to change the projection when load esri dynamic map?

[XintaoLiu]

For example, if I want load this as base map: 
<layer label="Topo" type="tiled or dynamic" visible="false" alpha="1" url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"/>

is it possible to change the projection coordinates system, e.g. to from Mercator to North Pole? Thanks!

[XintaoLiu]

Does anyone have any clues? Thank you!

[BjornSvensson]

is it possible to change the projection coordinates system, e.g. to from Mercator to North Pole?

No, you cannot change the projection of the tiled maps.  The tiles have already been created, and there is no on-the-fly projection of them on the client.

[XintaoLiu]

No, you cannot change the projection of the tiled maps.  The tiles have already been created, and there is no on-the-fly projection of them on the client.

Thanks for your reply. It's reasonable that we  cannot change the projection of the tiled maps. But, how about the dynamic maps and feature layers? Can we change the projection on the client? Thank you!

[RhettZufelt]

I have not tried with "North Pole", but if you load "your" basemap intially OR set the WKID to North Pole, then you should be able to load the ESRI basemap if you load as type="dynamic".  That way, it won't be limited to the pre-rendered tiles, and can project it on the fly.  It is slower than loading as tiled, but it should put it in the correct location.

Just make sure the WKID is set BEFORE you load the ESRI map.

R_

[BjornSvensson]

I have not tried with "North Pole", but if you load "your" basemap intially OR set the WKID to North Pole, then you should be able to load the ESRI basemap...

I think that's a bad idea for several reasons, but the main one is probably that there are no tiles covering the poles. The Web Mercator projection does not cover the whole world, the max latitude shown is about 85 degrees north.

[RhettZufelt · Accepted solution]

I think that's a bad idea for several reasons, but the main one is probably that there are no tiles covering the poles. The Web Mercator projection does not cover the whole world, the max latitude shown is about 85 degrees north.

Like I said, I hadn't tested it with North Pole, and now that I look, I see the ESRI topo service doesn't cover anything north of Greenland, tiled or not.

Bjorn, 

Curious what the "other" reasons that make this a bad idea are?  Is there a "better" method for pulling as ESRI basemap service into a map that is other than mercator?

R_

[XintaoLiu]

Like I said, I hadn't tested it with North Pole, and now that I look, I see the ESRI topo service doesn't cover anything north of Greenland, tiled or not.

Bjorn, 

Curious what the "other" reasons that make this a bad idea are?  Is there a "better" method for pulling as ESRI basemap service into a map that is other than mercator?

R_

Thank you so much for your replies! I appreciate that. It worth trying the solution to see the loading speed.

I am also curious that whether ESRI basemap services have other projections other than Mercator? If yes, it should be cool!