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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Back in April in <a href="http://lists.openstreetmap.org/pipermail/talk-ca/2011-April/003929.html">http://lists.openstreetmap.org/pipermail/talk-ca/2011-April/003929.html</a> I proposed importing data from Surrey, BC to replace the current OSM waterway data for the city, which is derived from a NHD import. The license and accuracy of the data is not an issue, the only questions that arose were around the mapping of roadside drainage ditches.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The accuracy of the Surrey data is unquestionably better than the existing OSM data. The NHD data includes streams that were paved over 25 years ago.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In summary, the import would consist of four categories.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Streams. These typically meander, are in forested areas, are natural, and have names. They are often nutrient-bearing for fish.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Rural and agricultural ditches. These are long, straight, and sometimes have culverts.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Ditches in suburban areas. These are broken up by culverts and eventually drain into the storm drain system.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Culverts. These are in a separate file, and join the breaks together.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>At the time, no one was certain if adding ditches would cause the area to be unwieldy to edit. Over the last couple of days, I have been mapping in Queensborough, an area with very similar ditches.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://www.openstreetmap.org/?lat=49.19043&lon=-122.9372&zoom=17">http://www.openstreetmap.org/?lat=49.19043&lon=-122.9372&zoom=17</a> is the area.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Ditches can be found on Lawrence, Wood south of Ewen, Boyne, Pembina north of Ewen, Fenton and Johnston.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have found that the ditches are not a problem when editing the area. Adding the ditches takes some time to correctly split at culverts, but the ditches to be import are already split.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The blue waterway=ditch lines are subtle on the gray landuse=residential background and not overwhelming. I also looked at the osmarender and Open Mapquest renderings, as well as an assortment of cloudmade renderings.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>What I propose to do is process updated versions of the files and post them for review. I have some old sample waterways at <a href="http://maps.paulnorman.ca/surrey/samplewaterways.osm">http://maps.paulnorman.ca/surrey/samplewaterways.osm</a> but additional work is required, and I intend to use the latest shapefiles.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The waterways will be tagged with start_date, source, waterway, an ID in the surrey:* namespace and the nutrient/fish status in the surrey:* namespace.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The nutrient/fish statuses are documented on <a href="http://cosmos.surrey.ca/Geocortex/EssentialsExternal/Web/Metadata/metadata_external.html#drnFishClassifications">http://cosmos.surrey.ca/Geocortex/EssentialsExternal/Web/Metadata/metadata_external.html#drnFishClassifications</a><o:p></o:p></p><p class=MsoNormal>(broken HTML may be present)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>