[OSM-newbies] Tracing and offset error

[Gerhardus Geldenhuis]

Hi
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?

I have mainly been doing work in Zimbabwe and South Africa with work being
classified as:

   - Tracing and classing buildings
   - 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.
   - Tracing railway lines and roads in northern Zimbabwe.


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?

So to summarize my questions:

   - In the absence of immediate local presence, is tracing acceptable and
   not wasted effort.
   - Is there a reliable way to determine offset in a specific location
   without GPS track data

Regards

-- 
Gerhardus Geldenhuis
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