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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Chris this is a great idea.
Especially in my line of work/applications where we display thematic maps that don’t
allow even near complete caches of maps or tiles. Our work in <a
href="http://www.dataplace.org/">http://www.dataplace.org</a> (for fannie mae
foundation – along with Vinq) has relied on the simple <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>1.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>check tile cache<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>2.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>generate complete map (with thematic shading and layers)<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>3.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>slice tiles<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><span style='mso-list:Ignore'>4.<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>cache tiles<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>approach. Our cache though currently
large enough to have some recurring cache hits, won’t be able to be large
enough for the future of our app. That is we want to add more indicators
to our system (and thus many more potential maps being generated). As
well we want to add more complicated maps and chart shields as labels. The
universe of maps even with Terabyte drives won’t be covered by
pre-rendering.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We have been aiming towards a client side
rendering solution to increase our cache hits. I’m curious, has
anyone tried rendering a map with transparencies created by map server? I.e.
essentially doing what Chris suggested? Are the maps as pretty on Firefox
(given that IE doesn’t support full alpha-channel usage in PNG’s)?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>As well, has anyone looked at the approach
of actually rendering the layers (placing them on the map) one by one on the
client? I know this delves into fattening the client beyond the abilities
of javascript, but I’m curious if this has been discussed in the ka-map group.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Moran Ben-David<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Placebase (www.place-base.com)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
<div>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
ka-map-users-bounces@lists.maptools.org
[mailto:ka-map-users-bounces@lists.maptools.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Chris Tweedie<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, May 24, 2005 3:05
AM<br>
<b><span style='font-weight:bold'>To:</span></b>
ka-map-users@lists.maptools.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [ka-Map-users] Layer
Interaction/Overlays</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>To Paul / rest of the devs, what’s your
thoughts on adding transparency to the tiles and allowing tile/layer overlays?
I see you have commented out the following, so you may be already looking at
this?</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> </span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> // TODO:
We don't need transparency for now</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>
//$oMap->outputformat->set("transparent", MS_ON );</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> </span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>Im looking at instead of creating the tiled images
based on all layers in the map file, I would add a new config switch to specify
particular layers that you wish to split into separate tiles. Ideally, this
would allow particular layers in the map to be toggled on/off and be moved
hierarchically all on the client side.</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> </span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>Advantages:</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Complete client side transparency / z-index position using
CSS / DOM / JS</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Same benefits with cached tiles but further functionality</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Remove reliance on the server regenerating images to perform
simple layer ordering functions</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Will suit the planned cache refresh function seen on
bugzilla. If a layer data source is updated, only related layer images need to
be flushed, not everything.</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> </span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>Disadvantages:</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Cross browser support issues</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Integration with current code would require directory and
tile algorithm change</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Annotation clashes due to the images being created
independently. ie. labels and symbols may become illegible</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><font size=2
face=Arial><span lang=EN-AU style='font-size:10.0pt;font-family:Arial'>-</span></font><font
size=1><span lang=EN-AU style='font-size:7.0pt'>
</span></font><font size=2 face=Arial><span lang=EN-AU style='font-size:10.0pt;
font-family:Arial'>Increased overhead downloading images</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> </span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>While the download overhead may be significant
depending on the number of images you wish to overlay, typically you’d
limit the amount of layers available to be moved/turned off. However as the
xmlhttprequest handles concurrent downloading of images, I’d expect most
users will not notice the increased data as they can continue to zoom/pan.</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> </span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>Thoughts/Opinions? Thought I’d throw the idea
out there and gauge a response. Afterall, no point reinventing the wheel </span></font><font
size=2 face=Wingdings><span lang=EN-AU style='font-size:10.0pt;font-family:
Wingdings'>J</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'> </span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span lang=EN-AU
style='font-size:7.5pt;font-family:Arial;color:black'>---------------------------------------------------------------------------</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><strong><b><font size=2 face=Arial><span lang=EN-AU
style='font-size:10.0pt;font-family:Arial'>Chris Tweedie</span></font></b></strong><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>Technical Officer</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'>Shared Land Services</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-AU style='font-size:
7.5pt;font-family:Arial'>Department of Land Information</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><st1:address w:st="on"><st1:Street w:st="on"><font size=1
face=Arial><span lang=EN-AU style='font-size:7.5pt;font-family:Arial'>1
Midland Square</span></font></st1:Street><font size=1 face=Arial><span
lang=EN-AU style='font-size:7.5pt;font-family:Arial'>, <st1:City w:st="on">Midland</st1:City>,
<st1:State w:st="on">Western Australia</st1:State></span></font></st1:address><font
size=1 face=Arial><span lang=EN-AU style='font-size:7.5pt;font-family:Arial'>
6056</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><st1:address w:st="on"><st1:Street w:st="on"><font size=1
face=Arial><span lang=EN-AU style='font-size:7.5pt;font-family:Arial'>PO Box
2222</span></font></st1:Street><font size=1 face=Arial><span lang=EN-AU
style='font-size:7.5pt;font-family:Arial'> <st1:City w:st="on">Midland</st1:City></span></font></st1:address><font
size=1 face=Arial><span lang=EN-AU style='font-size:7.5pt;font-family:Arial'>
6936</span></font><span lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-AU style='font-size:
7.5pt;font-family:Arial'>Telephone: (08) 9273 7520 Facsimile (08) 9273 7638</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-AU style='font-size:
7.5pt;font-family:Arial'>Email: </span></font><font face=Arial><span
lang=EN-AU style='font-family:Arial'><a
href="mailto:chris.tweedie@dli.wa.gov.au"><font size=1><span style='font-size:
7.5pt'>chris.tweedie@dli.wa.gov.au</span></font></a></span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-AU style='font-size:
7.5pt;font-family:Arial'>Website: </span></font><font face=Arial><span
lang=EN-AU style='font-family:Arial'><a href="http://www.dli.wa.gov.au"><font
size=1><span style='font-size:7.5pt'>www.dli.wa.gov.au</span></font></a></span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=1 face=Arial><span lang=EN-AU style='font-size:
7.5pt;font-family:Arial'>---------------------------------------------------------------------------</span></font><span
lang=EN-AU><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-AU
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-AU
style='font-size:12.0pt'><br>
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