[Talk-ca] [HOT] Flooding in Richelieu River, Quebec, Canada :Follow-up (Complement of information)

Fri May 27 15:18:13 BST 2011

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
>>> Talk-ca at openstreetmap.org
>>> http://lists.openstreetmap.org/listinfo/talk-ca
>>
>>
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