Dear Pierre, According to the shapefile data, Lake Champlain, and hence Venise-en-Québec are above the 30 m elevation. The shapefile contains punctual elevations of 31 m in this area (Plage Missisquoi, for example). The next contour line would be the 40 m one, but it does not look like it would be very useful for this.
Best regards, Jean-Guilhem Le 27/05/2011 13:12, Pierre Béland a écrit : > Very thanks to Sam Vekemans, Brent Fraser and Jean-Guilhem Cailton for > their suggestions and help. > > Jean-Guilhem Cailton wrote on 201-05-27 > > The 30 m contour lines from tiles 031h03 and 031h06 (the shapefiles > you gave), > > potentially connected to Richelieu river, have been imported, and > put together > > in relation: http://www.openstreetmap.org/?relation=1602671 > Jean-Guilhem, I will use this information for a basis of discussion, > and see how it can reflect the flooded zones. Could you easily add to > the relation, the 30m elevation for Missisiquoi Bay where > Venise-en-Quebec town has been severely affected by floods? > regards, > > ------------------------------------------------------------------------ > /Pierre Béland / > 2011-05-27 > > ------------------------------------------------------------------------ > *De :* Jean-Guilhem Cailton > *Date/heure :* 2011-05-27 05:19:54 > *A :* Pierre_Béland > *Cc :* Brent Fraser; HOT Openstreetmap; talk-ca > *Sujet :* Re: [Talk-ca] [HOT] Flooding in Richelieu River, Quebec, > Canada :Follow-up (Complement of information) > Hi Pierre, > > The 30 m contour lines from tiles 031h03 and 031h06 (the shapefiles > you gave), potentially connected to Richelieu river, have been > imported, and put together in relation: > http://www.openstreetmap.org/?relation=1602671 > > Clearly, it is not enough to estimate the flooded zone, for which some > kind of flow analysis would be needed, but maybe it can help in some > areas, as you wrote. > > I used "ogr2ogr -where ELEVATION=30 ..." to extract the 30m contour > line, and ogr2osm.py to convert it to .osm, for Josm. > > Best wishes, > > Jean-Guilhem > > > Le 27/05/2011 06:30, Brent Fraser a écrit : >> Pierre, >> >> I can't comment on if the 30m contour solution is suitable, but if >> you want to extract the 30m contours, you could: >> >> 1. Use QGIS to extract 30m contour from *_FO.._1.shp files >> - load shapefile, Open Attribute Table, click on elevation >> field name to sort table by elevation value. >> - select all 30m values, click on Layer -> Save selection as >> vector file. Save shapefile >> >> 2. Use converter (one of the ones on >> http://wiki.openstreetmap.org/wiki/Import/Shapefile) to create .osm files >> (I haven't tried this) >> >> 3. Use Josm to load osm files, tag, and update to OSM >> Best Regards, >> Brent Fraser >> >> On 5/26/2011 8:46 PM, Pierre Béland wrote: >>> Many osm volunteers have worked in the last two days to correct >>> roads, complete Canvec import and add street names. >>> >>> An other task is to estimate the flooded zone along the Richelieu >>> River and Missisquoi Bay in Lake Champlain. One simple approach to >>> determine the flooded zones would be to use the 30 meter contour >>> line from Canvec data. This would be good at least for Richelieu River. >>> >>> These maps from Natural Resources Dept of Canada shows the 30 meter >>> contour line. For the areas I visited last week with volunteers, >>> this line delimits approximately the flooded zone. On monday 23, >>> water level of the Richelieu river went up to approximately 30.8 >>> meters in Saint-Jean-sur-Richelieu. >>> >>> Would it be a good solution to estimate the flooded zone ? >>> If so, any idea, how we can extract 30 meter contour line from shape >>> files using a tool such as Quantum GIS and convert to OSM ? >>> ftp://ftp2.cits.rncan.gc.ca/pub/canvec/50k_shp/031/h/canvec_031h03_shp.zip >>> <ftp://ftp2.cits.rncan.gc.ca/pub/canvec/50k_shp/031/h/canvec_031h03_shp.zip> >>> ftp://ftp2.cits.rncan.gc.ca/pub/canvec/50k_shp/031/h/canvec_031h06_shp.zip >>> <ftp://ftp2.cits.rncan.gc.ca/pub/canvec/50k_shp/031/h/canvec_031h03_shp.zip> >>> >>> Below is an example of Toporama map for Saint-Jean-sur-Richelieu, >>> the wms version of Canvec, where we can see the 30 meter contour line. >>> http://atlas.nrcan.gc. >>> ca/auth/english/maps/topo/map?mapsize=525%20466&mapxy=1700511.0503883713%20-122536.87132125527&scale=20000.000000&feature_na=Saint-Jean-sur-Richelieu&searchstring=saint-jean-sur-richelieu&layers=fapfeature%20nodata_ntdb_50k%20north_arrow%20other_features%20roads%20hydrography%20boundary%20builtup%20vegetation%20populated_places%20railway%20power_network%20manmade_features%20designated_areas%20water_features%20water_saturated_soils%20relief%20contours%20toponymy%20contour&map_layer[northarrow]_class[0]_style[0]=ANGLE%20-19.595747561783185&urlappend=%26unique_key%3D8dd3e319d1e111d892e2080020a0f4c9%26map.layer[textzoom03]%3DFEATURE+POINTS+1699114.16619+-120243.877124+END+TEXT+%22Saint-Jean-sur-Richelieu%22+END%26map.layer[textzoom46]%3DFEATURE+POINTS+1699114.16619+-120243.877124+END+TEXT+%22Saint-Jean-sur-Richelieu%22+END%26map.layer[arrowzoom03]%3DFEATURE+POINTS+1699114.16619+-120243.877124+END+END >>> <http://atlas.nrcan.gc.ca/auth/english/maps/topo/map?mapsize=525%20466&mapxy=1700511.0503883713%20-122536.87132125527&scale=20000.000000&feature_na=Saint-Jean-sur-Richelieu&searchstring=saint-jean-sur-richelieu&layers=fapfeature%20nodata_ntdb_50k%20north_arrow%20other_features%20roads%20hydrography%20boundary%20builtup%20vegetation%20populated_places%20railway%20power_network%20manmade_features%20designated_areas%20water_features%20water_saturated_soils%20relief%20contours%20toponymy%20contour&map_layer[northarrow]_class[0]_style[0]=ANGLE%20-19.595747561783185&urlappend=%26unique_key%3D8dd3e319d1e111d892e2080020a0f4c9%26map.layer[textzoom03]%3DFEATURE+POINTS+1699114.16619+-120243.877124+END+TEXT+%22Saint-Jean-sur-Richelieu%22+END%26map.layer[textzoom46]%3DFEATURE+POINTS+1699114.16619+-120243.877124+END+TEXT+%22Saint-Jean-sur-Richelieu%22+END%26map.layer[arrowzoom03]%3DFEATURE+POINTS+1699114.16619+-120243.877124+END+END> >>> >>> >>> regards >>> >>> ------------------------------------------------------------------------ >>> /Pierre Béland / >>> >>> ------------------------------------------------------------------------ >>> *De :* Pierre Béland >>> *Date/heure :* 2011-05-24 18:59:16 >>> *A :* HOT Openstreetmap >>> *Cc :* talk-ca >>> *Sujet :* [HOT] Flooding in Richelieu River, Quebec,Canada : >>> Follow-up (Complement of information) >>> Following are the ways and relation I have produced to document >>> Richelieu River flooding. >>> >>> Affected zones (These will be revised when I obtain more detailed >>> information on streets / areas affected. >>> >>> http://www.openstreetmap.org/browse/way/114705927 >>> >>> http://www.openstreetmap.org/browse/way/114705926 >>> >>> http://www.openstreetmap.org/browse/way/114705928 >>> >>> http://www.openstreetmap.org/browse/way/114706976 >>> >>> Boundary relation that could be used to produce Indexed map of >>> streets with tools such as Mapsomatic >>> http://www.openstreetmap.org/browse/relation/1600039 >>> >>> >>> /Pierre Béland / >>> // >>> >>> >>> _______________________________________________ >>> Talk-ca mailing list >>> [email protected] >>> http://lists.openstreetmap.org/listinfo/talk-ca >> >> >> _______________________________________________ >> Talk-ca mailing list >> [email protected] >> http://lists.openstreetmap.org/listinfo/talk-ca > > > -- > pgp 0x5939EAE2 > > > _______________________________________________ > Talk-ca mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-ca -- pgp 0x5939EAE2
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