Hi Steve, Thank you.
On Wed, Mar 2, 2016 at 12:31 PM, Steve Bower <[email protected]> wrote: > Gertrude, > Be aware that although "recreational" GPS devices have improved in > accuracy, my tests of one tablet (bought a year ago) had occassional > location errors of 100+ meters, which lasted for up to 1+ minutes. I've > seen similar test results reported elsewhere. You may want to consider the > accuracy of your GPS device, and test recreational devices (most phones & > tablets) by comparing readings with known locations. > > Good luck, > > ~~Steve > > > > On Mon, Feb 29, 2016 at 11:12 PM, Gertrude Hope <[email protected]> > wrote: > >> Hi Geof, >> What was their worry is that, if what we are using is not so accurate, >> They will end up tracing a person's toilet or water tap in a different >> compound. >> >> Gertrude >> On Mar 1, 2016 1:05 AM, "Geoffrey Kateregga" <[email protected]> >> wrote: >> >>> Hi Trudy, >>> >>> Thanks for the work done so far in building an OSM community in Zambia, >>> I can also share with you my experience in using OSMTracker, GPS units >>> and field papers from our mapping under "Ramani Huria" in Dar es Salaam. >>> >>> The accuracy of OSMTracker improves when you have an internet connection >>> and it can go as high as 3m or less, it is necessary to check the level of >>> accuracy when picking a way point. What usually helps is when you import >>> the track and waypoints into JOSM, then you can place the nodes more >>> accurately by looking at the imagery. >>> >>> Using Fieldpapers with Bing imagery may not be very helpful in informal >>> settlements where the houses are very close to each other, locating where >>> you are on the fieldpaper when in the field maybe challenging. If you can >>> afford it, acquiring several Garmin etrex 20 or 30 GPS units will prove >>> useful. >>> >>> Regards, >>> >>> Geoffrey. >>> >>> On Tue, Mar 1, 2016 at 1:35 AM, Gertrude Hope <[email protected]> >>> wrote: >>> >>>> Thank you Chris >>>> >>>> Gertrude >>>> On Mar 1, 2016 12:33 AM, "Chris Fleming" <[email protected]> wrote: >>>> >>>>> Blake has mostly covered it. But worth saying explicitly, if we assume >>>>> that the best you're going to get on a GPS is 5m, but your concern is that >>>>> you're mapping things that are much closer together - then the solution is >>>>> to combine the GPS and paper based approach. The important thing from a >>>>> navigation point of view is getting the relevant features correctly placed >>>>> reactive to each other. >>>>> >>>>> What you will find is that the combination of airial/gps and survey >>>>> data will bring the accuracy down. But ultimately, relative postition is >>>>> the key. >>>>> >>>>> Cheers >>>>> Chris >>>>> >>>>> On Mon, 29 Feb 2016 at 17:43 Gertrude Hope <[email protected]> >>>>> wrote: >>>>> >>>>>> Hi Blake, >>>>>> Thank you so much for The information. >>>>>> On Feb 29, 2016 7:31 PM, "Blake Girardot" <[email protected]> >>>>>> wrote: >>>>>> _______________________________________________ >>>>>> HOT mailing list >>>>>> [email protected] >>>>>> https://lists.openstreetmap.org/listinfo/hot >>>>>> >>>>> >>>> _______________________________________________ >>>> HOT mailing list >>>> [email protected] >>>> https://lists.openstreetmap.org/listinfo/hot >>>> >>>> >>> >> _______________________________________________ >> HOT mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/hot >> >> >
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