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<TITLE>DWF Viewer and map requests, scale dependent geometry</TITLE>
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<P><FONT SIZE=2 FACE="Arial">The MapGuide client as of version 6.5 did a pretty good job in only asking for data when it really needed it. More specifically</FONT></P>
<P><FONT SIZE=2 FACE="Arial">- turning a layer off, and then back on, did not result in any server requests. The layer data was cached and reused whenever the layer was turned on</FONT></P>
<P><FONT SIZE=2 FACE="Arial">- Zooming in only slightly (perhaps a click of the zoom wheel) did not result in any server requests, unless required by layer scale dependencies</FONT></P>
<P><FONT SIZE=2 FACE="Arial">- "Zoom to Previous View" often did not result in an any server requests, if possible</FONT>
<BR><FONT SIZE=2 FACE="Arial">The new DWF viewer does not seem to implement any of this functionality. When I flip a layer off and on, I see in the Apache logs that I am downloading the entire layer over again. When I zoom in a little bit, I am downloading a fresh copy of the entire map! The size and frequency of requests from the DWF viewer may make deployment in the field (over a wireless conection) impossible. </FONT></P>
<P><FONT SIZE=2 FACE="Arial">Is this a bug or a feature? </FONT>
<BR><FONT SIZE=2 FACE="Arial">I am guessing that caching is less feasible when you are serving up scale dependent geometry (lines are less detailed the further zoomed out you are), but is there/will there be a way to tune these parameters on a per layer basis? What if I don't want my geometry simplified? Will this have effects on DWF viewer caching?</FONT></P>
<P><FONT SIZE=2 FACE="Courier New">Joel Carranza<BR>
Gatekeeper Systems<BR>
626-449-3070 x114</FONT>
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