[OpenLayers-Users] General question and GML question

[Eric Lemoine]

I dont get it. I thought Ken re-projected all his data to spherical
mercator server-side!

Eric

2008/12/8, Christopher Schmidt <crschmidt at metacarta.com>:
> On Mon, Dec 08, 2008 at 10:05:35AM -0400, Ken Sanderson wrote:
>> Sorry for the confusion. This is the 'broken' version as I was hoping
>> someone might see what I was doing wrong to make it so this wouldnt
>> work. My working version does not have that 2153 reference.
>
> Does your application include proj4js, and definitions for the 2153
> projection?
>
>> Ken
>>
>>
>>
>> Eric Lemoine wrote:
>> > Hi Ken
>> >
>> > You're saying you reprojected the data to spherical mercator, but
>> > there still is a ref to an EPSG:2153 projection object in your GML
>> > layer's options. That doesn't look correct.
>> >
>> > Cheers,
>> >
>> > Eric
>> >
>> > 2008/12/7, Ken Sanderson <ken at rockies.ca>:
>> >> Just thought I would post a quick update. I have been beating my head
>> >> against the problem for a few days and tried most everything I could
>> >> think of including the steps outlined below to reproject the vector
>> >> data. I tried KML as well and though it would display fine in Google
>> >> Earth, it wouldnt display at all in OpenLayers.
>> >>
>> >> Eventually I converted the data in ArcGIS to Web Mercator, then used
>> >> gvSIG to export the GML and that worked perfect. So clearly it was a
>> >> projection issue, but I am not sure why the reproject did not work as
>> >> it
>> >> seems fairly straight forward to implement. Is there anything I am
>> >> doing
>> >> wrong here:
>> >>
>> >> // create Google Mercator layers
>> >> var gphy = new OpenLayers.Layer.Google( "Google Physical", {type:
>> >> G_PHYSICAL_MAP,'sphericalMercator': true});
>> >> var gmap = new OpenLayers.Layer.Google( "Google Streets",
>> >> {'sphericalMercator': true});
>> >> var gsat = new OpenLayers.Layer.Google( "Google Sattelite", {type:
>> >> G_SATELLITE_MAP, 'sphericalMercator': true});
>> >> var ghyb = new OpenLayers.Layer.Google( "Google Hybrid", {type:
>> >> G_HYBRID_MAP, 'sphericalMercator': true});
>> >>
>> >> map.addLayers([gphy, gmap, gsat, ghyb]);
>> >>
>> >> var partners = new OpenLayers.Layer.GML("Partner Boundaries",
>> >> "data/member_gvsig.gml", {projection: new
>> >> OpenLayers.Projection("EPSG:2153")});
>> >>
>> >> map.addLayer(partners);
>> >>
>> >>
>> >> Chris I tried to send you my GML files on Friday, was having email
>> >> issues so not sure that you go them or not?
>> >>
>> >> Thanks for your help,
>> >>
>> >> Ken
>> >>
>> >>
>> >>
>> >>
>> >> Christopher Schmidt wrote:
>> >>> On Fri, Dec 05, 2008 at 11:42:30AM -0400, Ken Sanderson wrote:
>> >>>> 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.
>> >>> OpenLayers has a built in ability to convert between EPSG:4326
>> >>> (lat/lon)
>> >>> and Google's Mercator projection: see
>> >>> http://docs.openlayers.org/spherical_mercator/#reprojecting-vector-data
>> >>> for more information on how to use it.
>> >>>
>> >>>> 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.
>> >>> Can you share the GML file you generated? It's possible this is a
>> >>> version problem, or some other parsing error: without seeing the GML
>> >>> file (or a sample file that fails) it's hard to know for sure.
>> >>>
>> >>> Regards,
>> >> --
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> --
> Christopher Schmidt
> MetaCarta
>