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<div class="moz-cite-prefix">Since I am also interested in this
discussion I'd like to crosspost my answer also to the talk
mailing list:<br>
<br>
Hello Gerhardus,<br>
<br>
>In the absence of immediate local presence, is tracing
acceptable and not wasted effort.<br>
<br>
Personally I only do aerial image mapping to a limited extent
because I fear that I will map wrong objects (e.g. nonexisting
buildings, roads) because of outdated bing images. I feel much
more comfortable to do bing mapping when I also do know the
surrounding by own survey.<br>
However, I would follow a pragmatic approach: E.g. If there is no
railway at all in the map, and you think that it is likely that
the railway is still there I would go for remote mapping.<br>
<br>
Offset Problem:<br>
Maybe you could compare objects already being mapped on a large
scale ( larger towns ) and only do large scale mapping like major
roads, but no micro mapping like lake boundaries on a 50 m scale
without having better offset information.<br>
<br>
Michael<br>
<br>
<br>
Am 01.12.2012 13:59, schrieb Gerhardus Geldenhuis:<br>
</div>
<blockquote
cite="mid:CAATm_0pueNr99RLiZOhhfg9OKMKo3gin5yLU98pbsnfEgOXDrA@mail.gmail.com"
type="cite">Hi
<div>I have mainly been doing tracing of Bing images in far flung
corners of the world where I have been. However I have been
reading about offset problems with Bing imagery and was
wondering if this would all be wasted work? </div>
<div><br>
</div>
<div>I have mainly been doing work in Zimbabwe and South Africa
with work being classified as:</div>
<div>
<ul>
<li>Tracing and classing buildings</li>
<li>Making lake outlines more accurate. Lake Kariba as an
example is a bit rough and ready. This is mainly prep work
so I can add marinas and other amenities. </li>
<li>Tracing railway lines and roads in northern Zimbabwe.</li>
</ul>
<div><br>
</div>
<div>I might revisit a number of the places I have edited and
will then be able to get some GPS traces, building names etc
that I could use to compare offset with. But in the meantime
is there any other way to determine the offset of satellite
imagery?</div>
<div><br>
</div>
<div>So to summarize my questions:</div>
<div>
<ul>
<li>In the absence of immediate local presence, is tracing
acceptable and not wasted effort.</li>
<li>Is there a reliable way to determine offset in a
specific location without GPS track data</li>
</ul>
<div>Regards<br>
</div>
</div>
<div><br>
</div>
-- <br>
Gerhardus Geldenhuis<br>
</div>
<br>
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