On Jun 22, 2022, at 6:45 PM, Alex Sims wrote:
> I’ve now got a relatively (<$100 + postage) Mouse GPS. It is amazingly
> accurate. That’s the good news.
>
> Now I can see a whole bunch of streets, buildings etc out by 1-5 meters as
> *some* features were traced without correcting the image offset. Also found
> my cheap GPS and an OSX machine are not a great combination. GPSD gets
> confused and ends up with mojibake most times. Virtual serial port is fine in
> screen, QGIS etc.
>
> Still fun
I don't know the specific product, I'll look it up (and I'm in the States,
maybe I can't get one, or only with difficulty, not worth shipping / taxes /
duty / customs, whatever).
Image offset-derived "smears" in OSM's data can be a pain in the neck,
especially as you get "multiple drifts" from a number of (imaging) sources.
However, 1 to 5 meters, today (2022) isn't terrible. And over years (yeah,
sorry for those in a hurry), I have noticed "this gets better." It's an
ongoing effort. Think of it like a slow motion countdown to zero, but like
Zeno's Paradox, never really quite gets there. Too, precision can be in the
eye of the beholder. 1 to 5 meters? Hey, you're not lost, perhaps a bit
"smeary" but not lost.
JOSM does have a way to "imagery offset" differing layers, though I find it's
only a temporary solution and try to keep these at 0,0. My recommendation is
to not try to do too much correcting all at once. Chip away at it. The data
do get better. Slowly, surely.
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