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<div class="moz-cite-prefix">Bob,<br>
<br>
I'm not sure I've successfully visualized your solution, but I
do appreciate your problem. While the web mapping community has
come up with decent set of concepts and tools for spatially
navigating data (pan, zoom, etc), we seem to be lacking a
standard, intuitive (?) set of tools for temporally exploring data
with a strong geospatial connection. <br>
<br>
Some of the temporal concepts stolen from geography that we'll
have to deal with: event extents, event resolution/density,
temporal scale (especially with respect to animation),...<br>
<br>
I think the eventual solution will be JavaScript-based, maybe
nearly the size of OpenLayers effort. I'm leaning towards having
separate panel (like we tend to have for the legend, etc) for time
navigation. For layout and interaction ideas, have a look at the
D3 examples (<a class="moz-txt-link-freetext" href="https://github.com/mbostock/d3/wiki/Gallery">https://github.com/mbostock/d3/wiki/Gallery</a>),
particularly the CrossFilter
(<a class="moz-txt-link-freetext" href="http://square.github.com/crossfilter/">http://square.github.com/crossfilter/</a>) example.<br>
<br>
Sorry, no solution; just encouragement...<br>
<pre class="moz-signature" cols="72">Best Regards,
Brent Fraser</pre>
On 4/9/2013 7:48 AM, Basques, Bob (CI-StPaul) wrote:<br>
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<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">All,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">Ok, granted weird title for a posting.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">I have a little reporting project that I’m
thinking about related to GPS tracking. Bouncing the idea
off of folks here in the hopes that someone may have tried
this somewhere else or maybe has a better way.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">I need to generate a slider control for handling
sorting through the GPS data for individual vehicles on a
daily basis. The idea is to build a rapid, visually
oriented, lookup system for the data. To begin with, I
would like to start the process by querying for the data for
a single GPS ID for a 24 hour period, generate a time based
slider control that can be used to pick a point in time, and
then have a slippy map (OpenLayers) auto zoom to that
location, once a location has been decided on.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">I found an example on the Openlayers site for the
slippy map part, I have a service (yet to build) that can
grab the location data by time increments of 24 hours, but
the slider part is looking like it might be a bit intensive
if built in a standard way. The data for the GPS devices
can come in all sorts of time resolutions, some are based on
15 – 20 sec updating, while others are using 3 sec update
increments. The resulting 24hr dataset can be somewhat
sizeable as a result.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">Here is my weird idea. Make the Slider into a
MapServer map call that is aggregated at certain time
increments (Map tile pyramid levels, only in a single
direction, left/right) if the slider is zoomed more
resolution of time appears for picking the location in the
slippy map. The slider becomes a real wide but not very
tall map but only for displaying, and picking by the user a
new time increment. This approach should therefore
compensate for browser view size as well as density of time
data, by making an appropriately sized, scaled tile on
demand. It should also be adaptable in the future to
starting out with larger time increments to show where GPS
activity was, and then to zoom in on that time increment for
detailed analysis.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">Ok, I’m ready, tell me it’s a stupid way to go . .
.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS"">Bobb<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Comic Sans
MS""><o:p> </o:p></span></p>
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