[OpenLayers-Users] General question and GML question

[Ken Sanderson]

Hi everyone, this is about my third time giving OpenLayers a try and 
this time I thought I would bite the bullet and ask some questions 
instead of just going back to my mapserver setup.

First a general best approach question. What I want to do is use google 
data and put a simple polygon boundary on top. That boundary is 
currently in a shape file. My thinking was to convert the shp file to 
gml and just add it as a layer. I have since read that this maybe 
tricker then I thought as google data is in a mercator projection that 
does not have an EPSG code. So then I thought I would just create the 
projection and project my data to match it in another application before 
converting it to gml.

So my question, is this the best approach, or is there a better way? I 
could use WMS, but I prefer not to require a wms server to host the 
local data.

Second more specific to the use of GML layers. I converted my shp file 
to GML using gvSIG and in another attempt shp2gml from spatial order. I 
cannot get my GML file to be viewable. Thinking it might be a projection 
issue I thought I would just display my GML file on its own, to avoid 
any conflicting projections, but that hasnt worked either. Using the 
gml-layer.html example I tried to work backwards and put my GML file in 
there, no luck.

So my two part question in this regard is: Is there a required element 
in the GML file that perhaps my GML files are missing? With the 
gml-layer.html example, if I remove the WMS base layer it will stop 
displaying the example GML data. Why is that? How can I display GML data 
by itself for testing purposes?

Thanks,

Ken





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