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<p class="MsoNormal">Hi List<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m using the following query to offset my geometry from a road centre line.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">SELECT row_number() OVER () AS gid,<o:p></o:p></p>
<p class="MsoNormal"> gm_scrim_master_b.esu_id,<o:p></o:p></p>
<p class="MsoNormal"> st_curvetoline(st_offsetcurve(gm_scrim_master_b.geometry, 3::double precision, 'quad_segs=8 join=round'::text)) AS geometry<o:p></o:p></p>
<p class="MsoNormal"> FROM roads.gm_scrim_master_b<o:p></o:p></p>
<p class="MsoNormal"> WHERE st_isvalid(gm_scrim_master_b.geometry);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">SELECT row_number() OVER () AS gid,<o:p></o:p></p>
<p class="MsoNormal"> gm_scrim_master_b.esu_id,<o:p></o:p></p>
<p class="MsoNormal"> st_curvetoline(st_offsetcurve(gm_scrim_master_b.geometry, -3::double precision, 'quad_segs=8 join=round'::text)) AS geometry<o:p></o:p></p>
<p class="MsoNormal"> FROM roads.gm_scrim_master_b<o:p></o:p></p>
<p class="MsoNormal"> WHERE st_isvalid(gm_scrim_master_b.geometry);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I offset one way I get a nice complete line. If I go the other way I get a line with gaps in it. The source data is LINESTRING and I am checking validity to see if that is an issue. Anyone got any suggestions as to where to start
looking?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Ross<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><img width="458" height="469" id="Picture_x0020_1" src="cid:image001.png@01D3A5B4.131C3B70" alt="cid:image001.png@01D3A5AF.0FD714D0"></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#4F6228;mso-fareast-language:EN-GB">Ross McDonald |
</span></b><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#4F6228;mso-fareast-language:EN-GB">GIS Data Coordinator | Angus Council, People, IT | Angus House, Orchardbank Business Park, Sylvie Way, Forfar DD8 1AT<b> | t: 01307
476419<o:p></o:p></b></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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