Hakimi Naimi wrote:
> I've used to faced this problem since the first time I've used Mapinfo on
> Windows (Version 3) up to now (ver 5.5). After you have carry out
on-screen
> digitising and exit, the next time you open them there is a shift between
> the underlay raster and the digitised vector. Unfortunately the shift is
not
> consistent in direction neither of consistent value. Any clues to this ?
We
> have tested trying adding control points but it seems that it still occur.
1. It could be that you are attempting to digitize off of more than one
image at a time in the same map window.
The objects you are digitizing will be accurate with only one of the images.
Digitizing from multiple images is advisable only if you're using tiles
of digital orthophotography already rectified to a particular projection.
2. Make sure that the table you are drawing objects into is using the SAME
projection that the raster is. On-the-fly projection conversion is
notoriously
innacurate, especially if two projections use different datums.
HTH
Spencer
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