<br>Agreed, it's not as simple as I was hoping ;-(<br><br>cheers<br><br><div class="gmail_quote">On Thu, Mar 5, 2009 at 11:01 AM, Ross Scanlon <span dir="ltr"><<a href="mailto:info@4x4falcon.com">info@4x4falcon.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">> In some areas the ABS data does not line up with the existing coastline<br>
> which has come from yahoo or landsat., e.g<br>
><br>
> * Yowie Bay in sydney which I assume comes from Yahoo<br>
> * The Whitsunday islands that I assume comes from landsat<br>
><br>
> Once the upload is done I am inclined align the the existing Whitsunday<br>
> Islands<br>
> to the new suburb boundary.<br>
><br>
> But what about the the yahoo based coastline - case by case based on gps<br>
> traces if available ? what about if we have no traces ?<br>
><br>
> * Yowie Bay in sydney which I assume comes from Yahoo<br>
> * The Whitsunday islands that I assume comes from landsat<br>
><br>
> Once the upload is done I am inclined align the the existing Whitsunday<br>
> Islands to the new suburb boundary.<br>
<br>
<br>
</div><div class="im">The Whitsunday islands are PGS data.<br>
<br>
</div>Some sections have been aligned to Yahoo but not all.<br>
<div class="im"><br>
I'd be carefull about aligning to the ABS data without looking at Yahoo or<br>
some other sat image. The ABS data cuts across the mouth of some bays and<br>
inlets and also extends too far up some of the inlets. Have a look at<br>
Whitsunday Island with Yahoo imagery as the background. Part of Cid<br>
Harbour (western side) is cut off and Hill Inlet extends all the way up<br>
the inlet which probably should be marked as a river.<br>
<br>
</div>Also have a look at the area of Hamilton Island airport as the ABS data<br>
cuts across the runway and follows the original coastline. So this data<br>
has obviously not been updated since 1984 when the runway was built.<br>
<br>
--<br>
Cheers<br>
<font color="#888888">Ross<br>
</font><div><div></div><div class="h5"><br>
<br>
<br>
_______________________________________________<br>
Talk-au mailing list<br>
<a href="mailto:Talk-au@openstreetmap.org">Talk-au@openstreetmap.org</a><br>
<a href="http://lists.openstreetmap.org/listinfo/talk-au" target="_blank">http://lists.openstreetmap.org/listinfo/talk-au</a><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>Franc<br>