Hi Blake, Thanks, that's helpful. I suppose my question was about knowing whether the imagery is well aligned. If I'm going to generate a fixed address from it, then it should be accurate, at least at that moment in time. (That's different from OSM features, that can get realigned over time as bertery o.agery and/or more accurate consumer GPS becomes available.)
Doug's post however pointed out that due to continental drift, lat/lon will change over time, though that is a more predictable change, rather than depending on inaccuracies of imagery. Best wishes, from my mobile, Bjoern On Fri, 28 Dec 2018, 23:54 Blake Girardot <bgirar...@gmail.com wrote: > Hi Bjoern, > > I think the best way is to use the TMS overlay in JOSM or QGIS so you > can visualize what OLC would be best for a building. > > Just add this as a TMS layer in either tool: > https://grid.plus.codes/grid/tms/{z}/{x}/{y}.png and then zoom in to > the building level. > > I also suggest using the full 10 digit codes only, not the shortened forms. > > Let me know if I can help with any of that. > > Cheers, > Blake > > On Fri, Dec 28, 2018 at 1:09 PM Bjoern Hassler <bjo...@gmail.com> wrote: > > > > I guess the question is kinda answered here: > https://groups.google.com/forum/#!topic/open-location-code/6pWknU4VJ0s > > Bjoern > > > > On Friday, 28 December 2018 18:07:34 UTC, Bjoern Hassler wrote: > >> > >> Hello all, > >> > >> How can I accurately assign a plus code from satellite imagery? > Satellite imagery sometimes has offsets that run to several metres > (possibly 10th of meters - though I don't know off-hand what's typical). > Certainly when going between different sets of imagery, objects 'move'. > >> > >> Of course, this is a generic problem, but when e.g. when tracing over > images to create data for OpenStreetMap, it doesn't matter all that much, > as what I'm mapping is at least topologically correct, and (until cm-GPS > becomes standard on consumer devices) that works. > >> > >> However, if use plus codes to generate postcodes, I don't want to have > to change these as more accurate data is released. Suppose I have a rural > location near the equator, say with a few 100 buildings, and I want to > assign plus codes as postcodes - what's the best option? I could measure > with a phone - and get a location accurate to a few metres, and check the > alignment of imagery - but that's cumbersome, as I have to do this in each > location I want to record (the offset on imagery changes). > >> > >> So if I am using geodata derived from satellite images - what's the > best strategy to ensure that the alignment of these images with actual > WGS84 is as accurate as possible? > >> > >> Thanks! > >> Bjoern > > > > -- > > Public site: http://www.openlocationcode.com/ > > Github project: https://github.com/google/open-location-code > > Demo site: http://plus.codes/ > > --- > > You received this message because you are subscribed to the Google > Groups "Plus Codes Community Forum" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to open-location-code+unsubscr...@googlegroups.com. > > To post to this group, send email to open-location-code@googlegroups.com > . > > Visit this group at https://groups.google.com/group/open-location-code. > > To view this discussion on the web, visit > https://groups.google.com/d/msgid/open-location-code/02cc2d57-c16a-4476-9ee1-951e20fc3311%40googlegroups.com > . > > For more options, visit https://groups.google.com/d/optout. > > > > -- > ---------------------------------------------------- > Blake Girardot > OSM Wiki - https://wiki.openstreetmap.org/wiki/User:Bgirardot > HOTOSM Member - https://hotosm.org/users/blake_girardot > skype: jblakegirardot > > -- > Public site: http://www.openlocationcode.com/ > Github project: https://github.com/google/open-location-code > Demo site: http://plus.codes/ > --- > You received this message because you are subscribed to a topic in the > Google Groups "Plus Codes Community Forum" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/open-location-code/ufflVoQbzqI/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > open-location-code+unsubscr...@googlegroups.com. > To post to this group, send an email to > open-location-code@googlegroups.com. > Visit this group at https://groups.google.com/group/open-location-code. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/open-location-code/CABmB%2B%2BQwEqAg_uTUGz6Y5ewr54Xu7jW27Z88kqNbfXK1OhFxOA%40mail.gmail.com > . > For more options, visit https://groups.google.com/d/optout. > -- Public site: http://www.openlocationcode.com/ Github project: https://github.com/google/open-location-code Demo site: http://plus.codes/ --- You received this message because you are subscribed to the Google Groups "Plus Codes Community Forum" group. 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