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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thank you everyone! <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'>I’ve got something that basically is
working now. One other thing I was curious about, with regard to a multi-ring
buffer, is isolating results within one buffer range (for example, 0-50 meters,
then 50-100 meters). Using a simple buffer shape will give me results for
all rings, 0 to (d). I have some ideas on addressing this, basically
comparing results from one range to another and eliminating duplicates.
But if somebody has a better idea, I’d love to hear it.<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>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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'> Lime, Steve D
(DNR) [mailto:Steve.Lime@state.mn.us] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 15, 2011
3:59 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Bistrais,
Bob</st1:PersonName><br>
<b><span style='font-weight:bold'>Cc:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapserver-users]
Buffer features?</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 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>MapServer queries,
at least some of them, respect layer tolerances which effectively acts like a
buffer. You can also take the result of your<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>buffering operation
and use it in a queryByShape() operation. Make sure you set your layer
tolerances appropriately (probably to 0) so that<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>you get features
that intersect with the shape.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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'> mapserver-users-bounces@lists.osgeo.org
[mailto:mapserver-users-bounces@lists.osgeo.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b><st1:PersonName w:st="on">Bistrais, Bob</st1:PersonName><br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 15, 2011
1:54 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Lime, Steve D (DNR)<br>
<b><span style='font-weight:bold'>Cc:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapserver-users]
Buffer features?<o:p></o:p></span></font></p>
</div>
</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 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>OK, that makes sense. One more thing
I’m not clear on- I can draw my buffer around the selected feature.
How can this buffer now be used to query another layer? I guess
it’s similar to other queries, but how to select this buffer feature and
use it as the input to the query?<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>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<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'> Lime, Steve D
(DNR) [mailto:Steve.Lime@state.mn.us] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 15, 2011
1:43 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Bistrais,
Bob</st1:PersonName><br>
<b><span style='font-weight:bold'>Cc:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapserver-users]
Buffer features?</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 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>You’d need to
use 3 different layers and change your code to create 3 different buffered
shapes accordingly.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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'>
mapserver-users-bounces@lists.osgeo.org
[mailto:mapserver-users-bounces@lists.osgeo.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b><st1:PersonName w:st="on">Bistrais, Bob</st1:PersonName><br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 15, 2011
12:30 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Lime, Steve D (DNR)<br>
<b><span style='font-weight:bold'>Cc:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapserver-users]
Buffer features?<o:p></o:p></span></font></p>
</div>
</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 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Not to make life more difficult, but is it
possible to create a multi-ring buffer, basically 3 polygons at 3 different
distances from a selected feature?<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>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<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'> Lime, Steve D
(DNR) [mailto:Steve.Lime@state.mn.us] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 15, 2011
12:22 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Tamas Szekeres<br>
<b><span style='font-weight:bold'>Cc:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapserver-users]
Buffer features?</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 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Not quite, I’m
thinking of a single layer setup:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>LAYER<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> DATA
myfile.shp # or whatever connection information is necessary<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> TYPE POLYGON<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> STATUS
DEFAULT <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> NAME
‘buffered_shapes’<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>
GEOMTRANSFORM (buffer([shape], 500)) # buffer each shape by 500 map units<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> #
classes and styles follow<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> TEMPLATE
‘void’<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>END<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>The GEOMTRANSFORM
would be applied as shapes are pulled from a data source so you would draw or,
potentially, query the transformed shapes. The difference between a layer-level
GEOMTRANSFORM and a style-level one is the coordinates they operate on. Layer-level
work would be done on a raw feature in map coordinates and style-level works on
pixels. We do layer-level stuff already, conceptually, in the form of
projections and clipping. The GEOMTRANSFORM just provides a way of extending
that work…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Note this type of
GEOMTRANSFORM expression is working for buffers in STYLEs in trunk (but using
pixels for the moment).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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'> Tamas Szekeres
[mailto:szekerest@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 15, 2011
11:12 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Lime, Steve D (DNR)<br>
<b><span style='font-weight:bold'>Cc:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [mapserver-users]
Buffer features?<o:p></o:p></span></font></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 style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Steve,<br>
<br>
Did you mean to achieve something like?:<br>
<br>
LAYER<br>
CONNECTIONTYPE TRANSFORM<br>
CONNECTION sourcelayer # reference to another
layer<br>
NAME transformlayer<br>
PROCESSING "TRANSFORM=(buffer([shape]))"<br>
TEMPLATE query.html<br>
....<br>
END<br>
LAYER<br>
CONNECTIONTYPE SHAPE<br>
DATA myfile.shp<br>
NAME sourcelayer<br>
....<br>
END<br>
<br>
<br>
Which is simple and easy to implement.<br>
<br>
Best regards,<br>
<br>
Tamas<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2011/2/15 Lime, Steve D (DNR) <<a
href="mailto:Steve.Lime@state.mn.us">Steve.Lime@state.mn.us</a>><o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>I’d approach RFC 22, especially the transform piece,
differently now with the parser changes implemented in 6.0. We now have
(with GEOS enabled) an expression syntax available to support things like
buffering, convex hull, differences, etc… or combinations thereof.
I’d implement layer-level GEOMTRANSFORMs in that case using these
expressions.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>On the query result side of things I’d consider adding a
layer template as a layer option. This would kinda work like the approach
outlined for Bob. You’d define a presentation template layer (no DATA
value) and run the query results through it instead of the regular layer (for
certain querymap types, e.g. highlight).</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>Steve</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'> </span></font><o:p></o:p></p>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;
border-color:-moz-use-text-color -moz-use-text-color'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=2 face="Times New Roman"><span style='font-size:10.0pt;font-weight:bold'>From:</span></font></b><font
size=2><span style='font-size:10.0pt'> <a
href="mailto:mapserver-users-bounces@lists.osgeo.org" target="_blank">mapserver-users-bounces@lists.osgeo.org</a>
[mailto:<a href="mailto:mapserver-users-bounces@lists.osgeo.org" target="_blank">mapserver-users-bounces@lists.osgeo.org</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Tamas Szekeres<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 15, 2011
3:06 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">Bistrais,
Bob</st1:PersonName><br>
<b><span style='font-weight:bold'>Cc:</span></b> mapserver-users<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [mapserver-users]
Buffer features?</span></font><o:p></o:p></p>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>In accordance with
the problem mentioned, I recall a resonable enhancement as described in <a
href="http://www.mapserver.org/development/rfc/ms-rfc-22a.html" target="_blank">RFC22a</a>
which would provide an option to configure all the stuff in the mapfile (not
requiring MapScript) and would make it easier to customize the query maps as
well.<br>
<br>
With this enhancement 2 new layer data providers could be implemented, like:<br>
<br>
1. CONNECTIONTYPE=QUERYRESULT would provide to represent the result sets of one
layer in a new layer.<br>
2. CONNECTIONTYPE=TRANSFORM would provide simple geometry transformations on a
source layer and then provide the modified features as a new layer.<br>
<br>
By chaining these layers together in a map configuration we could get <a
href="http://trac.osgeo.org/mapserver/attachment/ticket/2128/sample4.png"
target="_blank">such results</a> as included in the RFC document.<br>
<br>
I consider this kind of enhancement could be implemented within the scope of
1-2 days of work (comparable with a fully elaborated MapScript solution
providing the same)<br>
<br>
Best regards,<br>
<br>
Tamas<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>2011/2/14 <st1:PersonName
w:st="on">Bistrais, Bob</st1:PersonName> <<a
href="mailto:Bob.Bistrais@maine.gov" target="_blank">Bob.Bistrais@maine.gov</a>><o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face="Times New Roman"><span style='font-size:10.0pt'>This question may
have come up before, but I haven’t found it in the archives. I
would like to take a selected feature and buffer it to a specified
distance. I know it’s possible to do a queryByPoint with a buffer
distance, but I need to create an actual buffer shape to display on the
map. Has anyone done something like this before? Does MapServer have
this capability?</span></font><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
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target="_blank">http://lists.osgeo.org/mailman/listinfo/mapserver-users</a><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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