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

Jean-Guilhem Cailton jgc at arkemie.com
Fri May 27 10:19:46 BST 2011


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 /
>> // 
>>
>>
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-- 
pgp 0x5939EAE2

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