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google styled layer

Posted by nottaken on May 12, 2011 at 9:40pm
Project:OpenLayers
Version:6.x-2.0-alpha10
Component:Code
Category:support request
Priority:normal
Assigned:Unassigned
Status:postponed (maintainer needs more info)

Issue Summary

I have a custom google layer (currently used with GM v3 api) that I'd like to use as a OpenLayers layer. Before I dive into hacking around on a module to add this layer type. Is it possible to add a layer based on a url?

Here is a snippet of my javascript I have been using with google maps v3.

// Google Roads layer
      getTileUrl: function(ll, z) {
        var X = ll.x % (1 << z);
        return "http://mt0.google.com/vt/v=apt.116&hl=en-US&x="
        + X + "&y=" + ll.y + "&z=" + z +  "&src=apiv3&s=G&lyrs=r&apistyle=s.t:33|p.v:off&apistyle=s.t:49|s.e:l|p.v:on|p.l:50|p.s:24,s.t:5|p.v:off,s.t:6|p.v:off,s.t:1|p.v:off,s.t:5|p.v:off,s.t:2|p.v:off"
      },
      tileSize: new google.maps.Size(256, 256),
      isPng: false,
      maxZoom: 18,
      name: "Roads",
      alt: "Custom Roads"
    },

Thanks,

Brian

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Comments

#1

Posted by zzolo on May 15, 2011 at 11:42pm
Status:active» postponed (maintainer needs more info)

Hi @nottaken. I don't have much experience with this. This module uses the built-in Google maps stuff, so it's pretty simple. It would be cool to know what you find out.

#2

Posted by nottaken on May 26, 2011 at 9:32pm

zzolo,I added a sandbox project to do this. My first attempt at a D.O project - happy to hear feedback, and general comments about it.

Google Map Styled
http://drupal.org/sandbox/youngblood/1170046

#3

Posted by zzolo on May 26, 2011 at 10:16pm

Hi @nottaken. This pretty cool. The one thing I am a little worried about is that this accesses Google Tiles directly, which, from what I understand, is against Google's terms of use. One can only access them through their API. I would be happy to be wrong about this, but this is my current understanding.

#4

Posted by nottaken on May 27, 2011 at 2:42pm

zzolo, ah that may be true, although as you said hopefully this is not the case. I know others are doing this, but have not seen anything with the openlayers module. Various examples are already in the wild, but implementing the v3 api to do this shouldn't be a big deal, and would make it easier to implement the styles by using the json string given in the wizard.

The javascript code was based on examples here:
http://docs.openlayers.org/library/spherical_mercator.html

#5

Posted by nottaken on May 27, 2011 at 7:33pm

I'm looking into the documentation for OpenLayers.Layer.Google to see if you can add a google map as a overlay. As far as I can tell it doesn't have a isBaseLayer property. Does anyone know if any of the Google map layers are usable as a overlay, or are they just base maps?

#6

Posted by castawaybcn on June 7, 2011 at 6:13pm

subscribing

#7

Posted by nottaken on June 13, 2011 at 11:34pm

I've played around a little with the xyz layer type, and it seems to do the same thing. The base url just needs to be increase per issue http://drupal.org/node/1187596.

#8

Posted by jeffschuler on December 14, 2011 at 3:57pm

FWIW:

(a) No Access to Maps API(s) except through the Service. You must not access or use the Maps API(s) or any Content through any technology or means other than those provided in the Service, or through other explicitly authorized means Google may designate. For example, you must not access map tiles or imagery through interfaces or channels (including undocumented Google interfaces) other than the Maps API(s).

-- Google Maps/Google Earth APIs Terms of Service

#9

Posted by zzolo on December 14, 2011 at 5:16pm

Thanks @jeffschuler. That's what I figured.

So, the OL library actually sits on top of the Google Maps API, when displaying Google layers. The Google Maps API object is referenceable, so this means that there has to be some way to hack this together, but utilizing the Google Maps API within the OL context.

#10

Posted by jeffschuler on December 14, 2011 at 6:47pm

I haven't really grokked the example provided in the original post, but If what we're trying to do here is use a Google Styled Maps-created base layer, @nod_ has a working example of a custom module that provides an OL layer with Google's custom styling JSON.

#11

Posted by nottaken on January 8, 2012 at 4:50am

@jeffschuler, this was my overall goal - create a layer, and take the json string from the google custom styling wizard to display the overlay. Ideally, it would be useful to use this layer as a overlay, and not a base layer.

I'd be interested in seeing the work @nod_ has done here.

Thanks,

brian