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).
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