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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"">I have a bunch of individual LINE segments in Postgres and want to display them via MapServer like so:<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"">First:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:8.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Get a chunk of them based on a set of IDs (a set of three for example) and a begin/end timestamp (got this figured out already)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:8.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Take the result and combine up the separate line strings into multi-segment (grouped) lines ordered by ID, timestamp (got this figured out for individual IDs)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:8.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Add a random number to each grouping of multi-line string rows for dynamic color-coding of each group. (got this figured out for individual IDs)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:8.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:8.0pt;font-family:"Comic Sans MS"">Have results output as three rows, one for each multi-segment line.<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’m lost on the method to do the last piece. Mostly it relates about how to approach which piece first. Seems like a straightforward SQL, but I’ve tried a few different things,
and it falls part each time for me.<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"">Anyone have examples of something like this to start from?<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"">The pertinent Mapfile fragment, I know this only color codes each individual segment at the moment. VEH_IDs are passed into the MapFile from CGI (vname=veh_id in DB):<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-family:"Courier New"">DATA "the_line FROM (select the_line, vname, acqtime, trunc(random() * 4 + 1) rnum from loc) as foo USING unique vname using SRID=4326"<br>
<br>
FILTER " vname in (%veh_id%) AND acqtime > '%time_idx1%' AND acqtime <'%time_idx2%' "<br>
<br>
VALIDATION<br>
'time_idx1' '.*'<br>
'time_idx2' '.*'<br>
'veh_id' '.*' ## veh_id=’100’,’200’,’300’ . . .<br>
END<br>
<br>
CLASSITEM "rnum"<br>
<br>
CLASS ## Use the RNUM value to color code the line strings randomly.<br>
STYLE<br>
COLOR 255 0 0<br>
WIDTH 5<br>
END<br>
EXPRESSION '1'<br>
END<br>
CLASS<br>
STYLE<br>
COLOR 0 255 0<br>
WIDTH 5<br>
END<br>
EXPRESSION '2'<br>
END<br>
CLASS<br>
STYLE<br>
COLOR 0 0 255<br>
WIDTH 5<br>
END<br>
EXPRESSION '3'<br>
END<br>
CLASS<br>
STYLE<br>
COLOR 255 255 0<br>
WIDTH 5<br>
END<br>
EXPRESSION '4'<br>
END<br>
CLASS<br>
NAME "Segments"<br>
STYLE<br>
COLOR 0 255 0<br>
WIDTH 5<br>
END<br>
END<br>
<br>
</span><span style="font-size:8.0pt;font-family:"Courier New""><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"">Thanks<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>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Comic Sans MS""><o:p> </o:p></span></p>
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