<br><br><div class="gmail_quote">2009/8/12 Elizabeth Dodd <span dir="ltr"><<a href="mailto:edodd@billiau.net">edodd@billiau.net</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
can i express this problem more clearly<br>
<br>
we are a very small number of mappers covering a very large area.<br>
most proprietary maps contain lines drawn randomly across the map claiming to<br>
be roads.<br>
when planning a route between two towns<br>
we study the proprietary maps, study OSM and pick a route to cover roads not<br>
yet mapped - or just traced off landsat<br>
so it is really very annoying to be looking for a road which doesn't exist<br>
except on paper. the road reserve may exist but it could be completely<br>
overgrown with trees, or be impassable with natural features - a cliff, a<br>
water feature<br>
<br>
and its even more annoying to be caught the next time.<br>
<br>
we are considering marking roads as impassable, having a "barrier" to their<br>
use or similar markers which may not ever be rendered but would mark the<br>
problem in the database<br>
<div><div></div><div class="h5"><br></div></div></blockquote></div><br>Ok, I understand your point. However, I am not sure that there is any way to detect if a road exists or not unless you are going there. You would need a list of existing roads but then we are back to the original point that the data came from a proprietary solution hence the reason why you end up in a bad situation.<br>
I am not sure what would be best. I see why you are looking at those maps to optimize your time to get the mapping done. I can't tell you to ask local people as I am sure in most cases, there won't be any. I understand your request even more since I looked quite extensively at Australia data some time ago. Landsat is not good enough.<br>
Maybe using STRM data (or the new elevation data) might give you some clues about cliff and other features. In addition, while the data from your governement is copyrighted, you have access to an enormous amount of data about natural features (I have seen a huge amount of shapefile if I remember correctly). You may want to look at those to infer what roads could be potentially wrong or not. But I am not sure that approach is what we want to do with OSM.<br>
<br>Emilie Laffray<br>