Pierre Béland pierzenh at yahoo.fr
Thu Apr 30 16:31:55 UTC 2015

this is a good descrption of crowmapping. 

We have to move from unstructured info and gradually give more signification to it. exchanging as we do this week helps progress. 

That's part of the motivation to participate to this humanitarian community and response.

cheers all. 

      De : Jonathan Webb <jonathan at jwebbgis.co.uk>
 À : hot at openstreetmap.org 
 Envoyé le : Jeudi 30 avril 2015 11h58
  Thanks Nick,
 Glad I pitched in - I nearly deleted my post as an outsider...
 I have found and been pointed to (by you & others) a load of useful info - there is not necessarily a shortage of info, just that it's in disparate places & I think this is the key issue.  In constructing this reply, I have found much of what I need to know but each strand isn't quite complete in itself & you need to find enough strands.  Ideally all the info would be in one place, in a coherent house style but that probably isn't possible.  I could have a go at that but I'd need a bit more mapping experience under my belt first.
 Re your link - on the whole it is very helpful. First off, I would prefer the font to be a tad larger as there is a lot of text & I'm pushing 50 (I saw another older respondent as well so I'm not alone) & my eyes aren't what they were.
 What I haven't found is much about the value judgements in interpreting the imagery for disaster purposes. Less of an issue for those with formal GIS/remote sensing training probably.  I think I am quite good at interpreting aerial imagery, but my experience is English Landscape (character) and heritage. This is very helpful: http://wiki.openstreetmap.org/wiki/User:Bgirardot/West_African_HOT_Mapping_Tips
 To me, it would seem important to know whether a track can take vehicles but I do not feel qualified to guess at this - some tips on interpreting rural tracks etc might be useful.  This could be a valuable use of a small amount of time for someone experienced in this, as it would enable newcomers like me to make a more useful contribution.
 In general terms, it would be helpful to have a concise "Executive Summary" about the aims of HOT - in terms of map quality & accuracy (in metres) and maybe some of the "woollier" aspects like whether it is OK to make an informed but subjective guess etc.  
 I've just seen this
 which addresses a number of the issues I think, in that it is a user-friendly, concise guide to resources.  Good work by the authors!
 It may be that there is just a lot to learn!  To some extent I thought "I can do GIS", I can do this, but in reality cartography is a discipline in its own right & it is somewhat presumptious to assume that a layman can do it just because they want to help (without any training):  It might be useful to make this point, in a friendly way to deter would-be mappers who come in & lock squares but don't achieve much.
 Hope I haven't waffled on too much - I've been exploring whilst I write this and consequently my position has changed a bit.  But newcomers still face the task of finding the information strands.
 Happy to help if I can
  Jonathan Webb 
 Freelance GIS Specialist 
 07941 921905 
HOT mailing list
HOT at openstreetmap.org

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