On 11/06/2015 6:14 PM, johnw wrote:
On Jun 11, 2015, at 4:49 PM, Martin Koppenhoefer
<dieterdre...@gmail.com <mailto:dieterdre...@gmail.com>> wrote:
offsets are an approximation to reduce the inherent problems of some
aerial layers, they won't solve problems like distortions. JOSM isn't
more precise to find a "proper offset" than any other tool, I suggest
you simply move the layer till it visually seems ok. Unless you do
high precision measurements in the field you won't know for sure what
is "right" and what is "wrong", or in other words: more or less
accurate. IMHO, relative precision (eg alignment, angles, straight vs
curves etc) is more important than positional precision.
I know the precision isn’t so important, but I want everything to be
the same relative location. The relative position is very important to
me. I know distortion can skew that, for hills and the like.
I was also under the impression there was a plugin for JSOM that
offered automatic imagery offset correction, something which I don’t
have access to in iD
I think that JOSM offset is simply from someone sending in their offset.
I don't trust it.
If you want to pick an OSM node/way to align to, I'd chose one that is
close to the imagery alignment and has a tag with source:location=
gps/survey .. and preferably one that has not been moved since that tag
was added.
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