what about paper mapping?
On Thu, Mar 6, 2014 at 4:01 PM, Gora Mohanty <[email protected]> wrote: > On 6 March 2014 14:31, Thejesh GN <[email protected]> wrote: > > > > Thanks a lot Shree. I will get in touch with them. > > > > > > Just to update the group. I did a small POC recently to see if its > achievable. I think its quite possible even-though a little difficult. > > [...] > > Yes, ODK is great. > > > Some issues that I faced > > 1. GPS logging is not very accurate. It has 4 to 8 meters of error, how > do we fix it? > > 4-8m is optimistic, and assumes quite some time spent to get a > proper GPS fix. Given the quality of the GPS in most phones, a > RMS error of 20m is more realistic. The only way to improve that > is to take a large number of readings, and average over these, but > this cannot be done with ODK out of the box. As the error in the > mean decreases as the square root of the number of observations, > one needs 25 readings to get from 20m to 4m, and 400 to get to > 1m. However, if the aim is to identify the general locality, the default > GPS accuracy should be fine. > > Regards, > Gora > > -- > For more details about this list > http://datameet.org/discussions/ > --- > You received this message because you are subscribed to the Google Groups > "datameet" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more details about this list http://datameet.org/discussions/ --- You received this message because you are subscribed to the Google Groups "datameet" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
