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I have applications that does this, using OpenLayers.<br>
Simply create two MapGuide layers, and set the bottom one to use JPG
compression.<br>
Fusion 2.0 should be able to support something like this (not sure if
1.1 does?)<br>
The drawback is that you get two server calls, but it is still faster,
even on fast lines.<br>
<pre class="moz-signature" cols="72">Regards, Kenneth Skovhede, GEOGRAF A/S
</pre>
<br>
<br>
Gary Morin skrev:
<blockquote cite="mid:6CA7C2C7DD3645159F1298B2F7C3B734@Gary2006"
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt;" lang="EN-GB">Hi <o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt;" lang="EN-GB">We currently have an issue with
MapGuide with the size of Image
download when viewing Aerial images or detailed raster maps, we are
finding the
average PNG download is 2 – 3 mb, this makes for very slow web client
when working over the internet.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt;" lang="EN-GB">We know you can change the image
format and have tested JPG and PNG8,
but the image degradation is to great, I’m not sure how much the
proposed
ticket </span></font><span class="apple-style-span"><font color="black"
face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB"><a moz-do-not-send="true"
href="http://trac.osgeo.org/mapguide/ticket/465">http://trac.osgeo.org/mapguide/ticket/465</a>
</span></font></span><font size="2"><span style="font-size: 10pt;"
lang="EN-GB">will
help with this.</span></font><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB"><o:p></o:p></span></font></span></p>
<p class="MsoNormal"><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB"><o:p> </o:p></span></font></span></p>
<p class="MsoNormal"><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB">We have experimented in using Base maps, but we really do
not want
fixed zoom scales.<o:p></o:p></span></font></span></p>
<p class="MsoNormal"><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB"><o:p> </o:p></span></font></span></p>
<p class="MsoNormal"><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB">So I wondered about a compromise, where the vector data
is downloaded
as PNG and image data is downloaded as compressed format, similar to
using Base
Maps but without the tilling, the PNG is then overlaid on the raster
image.
Does this makes sense?, would it be feasible for the a future
development? The
idea is you zoom and pan as normal for a non tiled map.<o:p></o:p></span></font></span></p>
<p class="MsoNormal"><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB"><o:p> </o:p></span></font></span></p>
<p class="MsoNormal"><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB">Any comments?<o:p></o:p></span></font></span></p>
<p class="MsoNormal"><span class="apple-style-span"><font
color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB"><o:p> </o:p></span></font></span></p>
<p class="MsoNormal"><st1:place w:st="on"><st1:City w:st="on"><span
class="apple-style-span"><font color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB">Gary</span></font></span></st1:City></st1:place><span
class="apple-style-span"><font color="black" face="Verdana" size="2"><span
style="font-size: 10pt; font-family: Verdana; color: black;"
lang="EN-GB"><o:p></o:p></span></font></span></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt;" lang="EN-GB"><o:p> </o:p></span></font></p>
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