[sldev] Webmap API change

Harold Brown labrat.hb at gmail.com
Fri Jan 30 02:08:14 PST 2009


I haven't had time to do much work with the OpenLayers SL API conversion.
But I did get the following done:

http://mysldev.com/~thraxis/slurl/

native OpenLayers API, with a second map layer to display the Region Name
and coordinates at the highest zoom level.  An overview map window is
included.


The name layer is generated via PHP and is using a cheap cache method to
cache the images.


On Mon, Jan 26, 2009 at 5:11 PM, Harold Brown <labrat.hb at gmail.com> wrote:

> I need to fiddle with my server tonight, maybe I'll have time to get
> TileCache setup and cache in some overlay tiles with the region names and
> co-ordinates on them.  My current system generates them on demand using
> PHP.... not the fastest method at the moment and only works at the highest
> zoom level.
>
>
> On Mon, Jan 26, 2009 at 4:34 PM, Ryan Williams (Which) <rdw at lindenlab.com>wrote:
>
>> Philip Rosedale wrote:
>> > I think that the problem is that you can only actually overlay
>> > transparent images in a browser using .PNG, right?  So that means that
>> > you can't really do it, because the only way to get anywhere near
>> > reasonable performance is the compression you get from JPEG.
>>
>> The base images compress well with JPEG, but any overlay images you'd
>> care to generate will likely compress well with PNG.  E.g. Google's map
>> overlays are mostly transparent with solid blocks of color.  Also, while
>> it is unacceptable to have slowly-loading base tiles, it's not as bad to
>> have overlay tiles that take longer to download and pop in later, on
>> top.  Food for thought.  :-)  Glad you made provision for overlays,
>> though.
>>
>
>
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