[HOT] Fwd: Accuracy ( international women's day)

[Steve Bower]

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 <trudyhope7 at gmail.com>
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" <kateregga1 at gmail.com> 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 <trudyhope7 at gmail.com>
>> wrote:
>>
>>> Thank you Chris
>>>
>>> Gertrude
>>> On Mar 1, 2016 12:33 AM, "Chris Fleming" <me at chrisfleming.org> 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 <trudyhope7 at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi Blake,
>>>>> Thank you so much for The information.
>>>>> On Feb 29, 2016 7:31 PM, "Blake Girardot" <bgirardot at gmail.com> wrote:
>>>>> _______________________________________________
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