WMS and Bing/Yahoo Basemap Overlays

Here is an interesting issue I found today with WMS overlay. When WMS layers are created in either Mapserver or Geoserver then added as overlays to Yahoo or Bing their alignment is wrong.

Let me step back. As mentioned in earlier posts. One can create a WMS layer in geoserver and through the excellent config interface add this as a layer to Google earth.



All align perfectly. Now adding the same WMS to Modest Maps and overlaying it on Yahoo shows the WMS misaligned:



Turning to Openlayers, I find the same problem:



In each of the latter cases the WMS layer also looks stretched. I'll find the fix and post it.

Mapping API's

I'll admit to being somewhat locked into the Modest Maps Flex API. As recent blog entries suggest, I've started looking at combining WMS and WFS data - served from MapeServer or Geoserver - with basemaps. I've had a number of people approach me about this combination, plus I've wanted the excuse the exlpore further.

Another area which I have started investigating are other Flex/Flash mapping API's. The main four are ESRI ArcMap, Google maps, Yahoo and Mapquest. I came across the following article written by Kevin Hoyt of Adobe. He compared the Google, Yahoo and Mapquest last year. Finding Mapquest the richest and best supported. He did a presentation which included Modest maps and ESRI's API. Its worth a read.

For me, after chatting with Mapquest at Where 2.0 this year, and based on what I have read, I'll turn my attention here first.