[OSM-talk] Some time ago ...

[Aun Johnsen]

With lack of Aerial images where I live and map, and with many narrow
streets with tall buildings on each side (urban cannyon effect), I
often need 10-15 GPS tracks of the same street to have reliable data
to enter the physical road into the database. As I often don't have a
chance to drive up and down roads that many times, I tend to enter
them with only one or two tracks and adjust them multiple times as I
get more tracks. The result is that I have no idea how many tracks I
have of various roads, and wether I need to gather more tracks or not
is often unknown to me. It can happen that a road that is perfectly
alligned with 25 tracks are adjusted slightly out of possition because
of possition errors on the 26th run. Also to some extent I have to
rely on physical observations. Do the street courve? Are there gaps in
the high-raise buildings where the GPS might adjust its signal? As I
do not have a car mount for my GPS, I seldom have a chance to check
the accuracy while driving, and with the general Brazilian traffic
pattern I need to consentrate on driving and not taking too many
notes. I tend to do some manual notes while I'm at it, like
restriction signs, name of businesses, etc. I can then derive from the
phone register the address of the business and than use that as a
street name. Also I often get business cards from shops where I order
services, these I also use as references for entering street names
(Business A have its service office in Street B, I parked almost
infront of the main entrance, ergo I know where Street B is).