[OpenLayers-Users] How to read OpenLayers Layer Definitions from file?

[Stephen Woodbridge]

On 3/20/2013 3:46 AM, Carlo Di Michele wrote:
> First of all congratulation Phil :-)))
> my name is Carlo (a "super nerd" of Open Layers :-(((((( ) I have to
> tell you that your project is amazing and it is exactly what I wish to
> do. Currently I'm working inside a petroleum company as consultant and
> (before my contracts end :-(( ) I had in my mind to introduce to my
> bosses (for my contract renewal ;-) ) a web solution exactly like this:
> BRAVO :-)))
>
> I have a question: we have some raster maps here to overlay on standard
> maps (google, satellite etc) and I would like to add also an opacity
> control to see the overlap between maps. I suppose that I should have it
> in a server in some way but I should tile and publish. Do you have any
> suggestions on how to do it? Is it possible?

http://openlayers.org/dev/examples/layer-opacity.html

The demo appears to be broken at the moment, but look at the page source 
for how it works.

-Steve

> I wait with anxious your precious suggestions to the Peter's questions too.
>
> Congratulation!!! Great Job :-)))))
> Carlo
>
>
> 2013/3/19 Phil Scadden <p.scadden at gns.cri.nz <mailto:p.scadden at gns.cri.nz>>
>
>     I do this. I have my layer definitions and behaviours in an external
>     file, stored as json format. The application fetches the json, and
>     then processes it to create the map with all the layers and desired
>     behaviour. I have a web application for defining the layers and
>     behaviours desired and storing to a json file. (Warning  - a
>     non-trivial amount of work).  You can see a resulting map at
>     http://data.gns.cri.nz/pbe/ (free registration required). The menu
>     contents are also completely defined by a json file. If you look at
>     the "interactive maps", you will see from URL, that it just loads
>     different json files for each map. This gives me one set of code to
>     create multiple web mapping applications. The other advantage is
>     that each content and behaviour can have user groups associated with
>     it. This way different classes of users (eg internal versus external
>     versus paying clients) get to see different things from the same
>     config. The json is filtered by user before passing it to OL.
>
>
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