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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