[mapguide-users] Silverlight/Moonlight Viewer

Johan Nel jnel at openspatial.com.au
Mon Feb 23 17:57:13 EST 2009

Hi All

The reason that MG6.5 was great in 1996, is as valid today as it was then.  
When the rest of the industry said you could only use raster as a web
client, Mapguide 
proved that you could do it with vector. 

Raster and Ajax is great if you want to do public websites and shings that
do not have to be live, but as GIS moves into mission critical status at
utilities, with many layers and huge datasets, tiling and raster just does
not cut it.

We are in the process of migrating from 6.5 (like Carl) and would be very
interested in a vector viewer, whether it is silverlight or another
technology. (Interestingly that is also where some others in the industry
are moving toward).

What would be the process to move this into a design direction.  If Carl and
others are willing to contribute we could look at that from our side as

Jason Birch wrote:
> Hi Carl,
> MGOS supports an image type of PNG8, which automatically reduces the bit
> depth of images from 24 to 8 bits as they are rendered.  This can't
> really be used with tiled images though because each tile would have a
> different palette.  I think that Zac did some experimentation running
> third-party compression tools over his tile cache?  Regardless, I don't
> think you'll see perceived performance as high as MG 6.5 from any of the
> current viewers any time soon.
> I would suspect that without a client that uses the (undocumented?) DWF
> eMap format, this will be removed from the server code.  I agree with
> you that a rich client viewer needs something other than XML/JSON for
> performance though.  I'm not sure how hard it would be to add a binary
> content type to the mapagent; I know that Haris has been thinking about
> this for the REST extension.  There are probably other things to think
> about too, such as getting this content type past firewalls, performance
> when using within Silverlight/Flex, etc.
> Jason
> -----Original Message-----
> From: Carl Jokl
> Sent: February-23-09 1:55 AM
> Subject: Re: [mapguide-users] Silverlight/Moonlight Viewer
> One issue that has been a problem though as I have
> heared reported from others in the company is the matter of image
> compression. This hits performance on both the AJAX and DWF viewer
> simply
> because the images being sent across the internet are larger than in
> MapGuide 6.5.
> [snip]
> I might fear also that if the DWF view is not going to be supported
> anymore
> there might also be a case for pulling the plug on supporting
> transmitting
> the map image data from the server in DWF form too.
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