[Talk-ht] TopoMap 1:50k Was: Onboarding new mappers

[David Groom]

Certainly the west around the  Dame Marie & Jeremie areas, the topomap 1:50k layer is way out of alignment with any other data source.  Its seems OK in other areas I have looked at.

Its Ok if you have really recognisable features such as a coastline to re-align the topomap layer, but I fear inland that much data may be traced by less experienced mappers which is simply in the wrong place.

David
 
  ----- Original Message ----- 
  From: ce-test, qualified testing bv - Gert Gremmen 
  To: talk-ht at openstreetmap.org 
  Sent: Friday, February 12, 2010 2:57 PM
  Subject: Re: [Talk-ht] Onboarding new mappers


  There is a huge amount of stuff to map in rural areas.

   

  1.       Install java en download JOSM

  2.       Install the WMS plug-in

  3.       Choose a rural area somewhere, not to big and download data

  4.       play around and study JOSM for an hour or so, ask questions if you need to

  5.       Install WMS layers "best aerial" and TOPO 50K

  6.       JOSM may shift layers so as to align them, to already avalaible data : the topo map below is less then 100 meter off however.

  7.       compare and map rivers, hamlets, roads (most tracks anyway)  land slidings , important buildings mountain peaks

  8.       The tope map gives you a wealth  of names and places and mountains peaks to map

  9.       The areal pictures show you roads, buildings and rivers (depends on available resolution in your area)

  10.   Study, compare and add missing items

  11.   Report the area you are working on to this list (topo map  reference lines ?) to avoid duplicates

   

  WMS links for JOSM

   

  best aerial :  http://hypercube.telascience.org/cgi-bin/mapserv?map=/geo/haiti/mapfiles/4326.map&layers=haiti-best&request=GetMap&version=1.0.0&styles=&format=image/jpeg&service=WMS&

   

  topomap 1:50K (all of Haiti)

  http://hypercube.telascience.org/cgi-bin/mapserv?map=/home/ortelius/haiti/haiti.map&layers=haiti-tlm-50&request=GetMap&version=1.0.0&styles=&format=image/jpeg&service=WMS&

   

  Well you also might map using the potlatch editor, but you won't have 2 layers to switch to,

  and while potlatch is easier to start with ... JOSM will do much better and accurate mapping,

  and has some features (like Q : make a building or area square-angled) and add-node-on-the fly

  You should see me mapping rivers / areas with that, that you will miss very much.

   

  Oh, do not forget to connect roads to roads, other wise a router may never find them.

  Loose roads are of no use .

   

   Well, see for yourself.

   

  Gert Gremmen


  Regards
  Karl 

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