Hi Pierre, thanks for the response. On Fri, Oct 19, 2012 at 3:25 PM, Pierre Béland <infosbelas-...@yahoo.fr> wrote: > I dont know how you conclude that there is no wetlands around this area in > Laval. It is not sufficient to see houses around to conclude that there is > no wetland. These are often wooded areas with water all over. Google > physical also shows a stream starting from this area. > > The link below shows a comparison of this area with Google imagery. Are you > sure that there is no wetland in this area. > http://tools.geofabrik.de/mc/?mt0=mapnik&mt1=googlehybrid&lon=-73.91012&lat=45.69989&zoom=17 This is a misunderstanding. I did not mean that there is _no_ wetland in the area. But I'm pretty certain that the boundaries of the wetland are wrong:
http://tools.geofabrik.de/mc/?mt0=mapnik&mt1=googlehybrid&lon=-73.90457&lat=45.69533&zoom=17 Aside from the wetland issue (see below), we can probably agree that the area is not natural = wood, even if some people might have planted trees in their yards. > The link below shows an aera in Saint-Jean-sur-Richelieu were houses have > been built for over 30 years. Look how many houses were flooded last year. > Zoom in to see areas that were flooded. > http://pierzen.dev.openstreetmap.org/hot/openlayers/inondation-richelieu-2011.htm?zoom=16&lat=45.28568&lon=-73.24907&layers=B000TFFFF > > My experience, as a volunteer for SOS-Richelieu, last year, showed me how > that too often the municipalities have accepted that contractors build > houses over wetlands. And this was often the case with Laval. Okay, this is a different issue, coming down to the definition of what "wetland" is. I'm by no means an expert, but in my understanding you can't have a residential area in wetlands. In order to build houses you must first use drainage channels etc. to turn wetland into developed land. The fact that there can be flooding in a given area doesn't make it into wetland to me. The wiki isn't very explicit about this (http://wiki.openstreetmap.org/wiki/Tag:natural%3Dwetland) but the specific subtypes seem to hint at a definition stricter than yours. Maybe someone can tell us what definition is used for Canvec. Cheers, Harald. _______________________________________________ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
