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<DIV><FONT color=#000080 size=2>Jean-Guilhem</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>The cholera epidemy and water contamination shows the
importance of well identifying the Drainage Bassins in Haiti. These like a tree
leaf, have complex ramifications not easy to analyze. I am not a GIS
specialist and dont know if specialized tools exist to analyse such
ramifications.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>Here are some observations following the validation
work I did manually last spring on Haiti Rivers, streams and
canals.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>The affluents of a river are complex
ramifications. See, for example, <A
href="http://www.openstreetmap.org/?lat=18.4057&lon=-72.0741&zoom=14&layers=M">http://www.openstreetmap.org/?lat=18.4057&lon=-72.0741&zoom=14&layers=M</A></FONT><FONT
color=#000080> . In such a ramification, its long and tedious to check each
ramification, to validate if directions are appropriate.</FONT></DIV>
<DIV><FONT color=#000080 size=2></FONT> </DIV>
<DIV>
<DIV><FONT color=#000080>To this regard, the Report <A
href="http://osm3.crans.org/haiti/suivi-affluents.php">http://osm3.crans.org/haiti/suivi-affluents.php</A> shows only
small part of Drainage bassins.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV></DIV>
<DIV><FONT color=#000080>To analyse and build good cartography of Drainage
bassins, w</FONT><FONT color=#000080>e have to consider all the waterways and
all ways and nodes connected to. I have identified waterways with the following
tags : river, stream, canal and drain.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>I have often seen ways with the wrong direction
(going upward). Yan report on rivers also shows many</FONT><FONT
color=#000080> small waterway segments not connected to a Drainage
Bassin.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>We have to consider the possibility that ways are
connected to a River ramification with wrong tags or are wrongly
connected to rivers.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT color=#c0c0c0 size=2><FONT color=#000080>Ideally, we would have to
analyse more deeply the river ramifications and identify different
incoherencies, check if all river names are present.</FONT></FONT></DIV>
<DIV> </DIV>
<DIV>If useful to identify steep slopes, it could also be possible to add
elevation to each node.</DIV>
<DIV> </DIV>
<DIV><FONT color=#000080>To do efficiently the validation work, it would be
necessary to extract all the nodes and ways connected to river ways and
relations.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT color=#000080>And badly, that, I dont know how to do with
Openstreetmap database. If it was possible to easily export all the information
related to rivers in a MySQL database, I think that we could do a lot of
validations from that database.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>In Yan List of Rivers
(http://www.tappenbeck.net/osm/data4wiki/haiti/haiti-river_wiki.html ), there
are still many unnamed segments. Many of them might be unconnected to other
rivers. This list have to be manually updated and might have not been
updated recently.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>Opencyclemap contour lines could be usefull
to identify river directions. But rivers are not showed on that map. I
dont know if there are ways to add simultaneously contour layers and river
layers to Openstreetmap.</FONT></DIV>
<DIV><FONT color=#000080></FONT> </DIV>
<DIV><FONT color=#000080>Exemples of problems</FONT></DIV>
<DIV><FONT color=#000080>Canal Desdunes (waterway=canal) not connected
page <A
href="http://www.openstreetmap.org/?lat=19.2867&lon=-72.5855&zoom=14&layers=M">http://www.openstreetmap.org/?lat=19.2867&lon=-72.5855&zoom=14&layers=M</A>
</FONT></DIV>
<DIV> </DIV>
<DIV>Many River ramifications not connected <A
href="http://www.openstreetmap.org/?lat=18.4397&lon=-71.9705&zoom=14&layers=M">http://www.openstreetmap.org/?lat=18.4397&lon=-71.9705&zoom=14&layers=M</A></DIV>
<DIV> </DIV>
<DIV>A stream connected to a road <A
href="http://www.openstreetmap.org/?lat=18.4579&lon=-71.8602&zoom=14&layers=M">http://www.openstreetmap.org/?lat=18.4579&lon=-71.8602&zoom=14&layers=M</A>
</DIV>
<DIV> </DIV>
<DIV>Rivers ending nowhere (or in canals ?) in suburb of Port-au-Prince <A
href="http://www.openstreetmap.org/?lat=18.5218&lon=-72.125&zoom=13&layers=M">http://www.openstreetmap.org/?lat=18.5218&lon=-72.125&zoom=13&layers=M</A> </DIV>
<DIV> </DIV>
<DIV>When looking at zoom level 13,14, you will see well the ramifications and
see a lot of problems with orphan rivers.</DIV>
<DIV> </DIV><FONT color=#000080 size=2>
<HR style="WIDTH: 100px" align=left color=#b5c4df SIZE=1>
</FONT>
<DIV><FONT color=#000080 size=2><EM><SPAN>Pierre Beland</SPAN>
</EM></FONT></DIV>
<DIV> </DIV>
<HR color=#b5c4df SIZE=1>
<DIV><FONT size=2><STRONG>De ：</STRONG> Jean-Guilhem Cailton </FONT></DIV>
<DIV><FONT size=2><STRONG>Date/heure ：</STRONG> 2010-10-23 19:34:56
</FONT></DIV>
<DIV><FONT size=2><STRONG>A ：</STRONG> HOT; Talk-ht </FONT></DIV>
<DIV><FONT size=2><STRONG>Cc ：</STRONG> OSM-talk; Jocelyn Jaubert </FONT></DIV>
<DIV><FONT size=2><STRONG>Sujet ：</STRONG> Re: [Talk-ht] River system analysis
tool for Haiti </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>
<DIV>Hi,</DIV>
<DIV></DIV>
<DIV>Jocelyn has setup a page showing the tributaries network for Haiti, </DIV>
<DIV>updated from hourly updates if all works well:</DIV>
<DIV></DIV>
<DIV>http://osm3.crans.org/haiti/suivi-affluents.php</DIV>
<DIV></DIV>
<DIV>For waterways to appear in it, they have to be represented by relations, </DIV>
<DIV>and tagged according to the scheme described in:</DIV>
<DIV>http://wiki.openstreetmap.org/wiki/User:Frodrigo/Relation:Waterway</DIV>
<DIV></DIV>
<DIV>i.e. with tributaries appearing as members of the destination relation, </DIV>
<DIV>with role=tributary, and being themselves relations if they have their </DIV>
<DIV>own tributaries.</DIV>
<DIV></DIV>
<DIV></DIV>
<DIV>(I have just learned how to add a relation as member of another relation </DIV>
<DIV>in JOSM:</DIV>
<DIV>- double click the tributary relation in the relations panel, it should </DIV>
<DIV>appear in pink in the main editing area;</DIV>
<DIV>- single click the destination relation;</DIV>
<DIV>- click on the "Modify relation" button).</DIV>
<DIV></DIV>
<DIV></DIV>
<DIV>It is also considered to maybe adapt the page</DIV>
<DIV>http://osm3.crans.org/haiti/pyramide-cours-eau.php?osm_id=48998245</DIV>
<DIV>(originally authored by Sly, and currently using ways only, not relations)</DIV>
<DIV>to build the network from topology information and display it in a table.</DIV>
<DIV></DIV>
<DIV></DIV>
<DIV>Many thanks to Jocelyn (and Frodrigo for discussion).</DIV>
<DIV></DIV>
<DIV>Jean-Guilhem</DIV>
<DIV></DIV>
<DIV></DIV>
<DIV>News from biosurveillance do not sound good, with</DIV>
<DIV>"Confirmation of Cholera at Multiple Sites in Port au Prince"</DIV>
<DIV>(http://biosurveillance.typepad.com/haiti_operational_biosurv/)</DIV>
<DIV></DIV>
<DIV>An extract from yesterday IFRC Information bulletin:</DIV>
<DIV>"A team of epidemiologists from the Department of Public Health and </DIV>
<DIV>Population (MSPP) was mobilized to</DIV>
<DIV>Artibonite to analyze samples taken from several patients to identify </DIV>
<DIV>the causative agent of the acute</DIV>
<DIV>diarrhoea outbreak. As a result of these analyses, the Ministry </DIV>
<DIV>confirmed that Vibrio cholerae is causing the</DIV>
<DIV>outbreak and that the source of the contamination is the river."</DIV>
<DIV>(http://www.reliefweb.int/rw/rwb.nsf/db900sid/MUMA-8AH3J5/$File/full_report.pdf)</DIV>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<DIV>_______________________________________________</DIV>
<DIV>Talk-ht mailing list</DIV>
<DIV>Talk-ht@openstreetmap.org</DIV>
<DIV>http://lists.openstreetmap.org/listinfo/talk-ht</DIV></FONT></DIV></BODY></HTML>