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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>you get features that intersect with the shape.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Steve<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> mapserver-users-bounces@lists.osgeo.org [mailto:mapserver-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Bistrais, Bob<br><b>Sent:</b> Tuesday, February 15, 2011 1:54 PM<br><b>To:</b> Lime, Steve D (DNR)<br><b>Cc:</b> mapserver-users<br><b>Subject:</b> RE: [mapserver-users] Buffer features?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";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></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center></div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Lime, Steve D (DNR) [mailto:Steve.Lime@state.mn.us] <br><b>Sent:</b> Tuesday, February 15, 2011 1:43 PM<br><b>To:</b> Bistrais, Bob<br><b>Cc:</b> mapserver-users<br><b>Subject:</b> RE: [mapserver-users] Buffer features?</span><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Steve<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> mapserver-users-bounces@lists.osgeo.org [mailto:mapserver-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Bistrais, Bob<br><b>Sent:</b> Tuesday, February 15, 2011 12:30 PM<br><b>To:</b> Lime, Steve D (DNR)<br><b>Cc:</b> mapserver-users<br><b>Subject:</b> RE: [mapserver-users] Buffer features?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";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></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center></div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Lime, Steve D (DNR) [mailto:Steve.Lime@state.mn.us] <br><b>Sent:</b> Tuesday, February 15, 2011 12:22 PM<br><b>To:</b> Tamas Szekeres<br><b>Cc:</b> mapserver-users<br><b>Subject:</b> RE: [mapserver-users] Buffer features?</span><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Not quite, I’m thinking of a single layer setup:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>LAYER<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> DATA myfile.shp # or whatever connection information is necessary<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> TYPE POLYGON<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> STATUS DEFAULT <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> NAME ‘buffered_shapes’<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> GEOMTRANSFORM (buffer([shape], 500)) # buffer each shape by 500 map units<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> # classes and styles follow<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> TEMPLATE ‘void’<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>END<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Steve<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Tamas Szekeres [mailto:szekerest@gmail.com] <br><b>Sent:</b> Tuesday, February 15, 2011 11:12 AM<br><b>To:</b> Lime, Steve D (DNR)<br><b>Cc:</b> mapserver-users<br><b>Subject:</b> Re: [mapserver-users] Buffer features?<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom: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></p><div><p class=MsoNormal>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></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Steve</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><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><span style='font-size:10.0pt'>From:</span></b><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>On Behalf Of </b>Tamas Szekeres<br><b>Sent:</b> Tuesday, February 15, 2011 3:06 AM<br><b>To:</b> Bistrais, Bob<br><b>Cc:</b> mapserver-users<br><b>Subject:</b> Re: [mapserver-users] Buffer features?</span><o:p></o:p></p></div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom: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></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>2011/2/14 Bistrais, Bob <<a href="mailto:Bob.Bistrais@maine.gov" target="_blank">Bob.Bistrais@maine.gov</a>><o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><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><o:p></o:p></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><br>_______________________________________________<br>mapserver-users mailing list<br><a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br><a href="http://lists.osgeo.org/mailman/listinfo/mapserver-users" target="_blank">http://lists.osgeo.org/mailman/listinfo/mapserver-users</a><o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>