On Wednesday 25 Jun 2008 13:39, Pradeepto Bhattacharya wrote:
Hey,
Since many people on this list have attended workshops oreven done some mapping/tracing work, I thought I would ask some questions here -
1) Suppose you are walking on a particular street - 2 waystreet even - you encounter a few shops - say a big Sweet and Snacks / Hotel / School / anything, on the same street. Now how do you put those on the maps while GPS tracking and then tracing the map on the computer?
I mean, the to reach the shop, you have to walk good5 meters or such - at times - depending on width of foot path or such. Now those paths are not roads really, and they can vary from place to place. How to tackle such offsets ?
GPS data is accurate to 2.5 mtr in a few, 5mtr for most under ideal conditions. Usually 10 Mtr. So you are anyway off by a few meters. For the accuracies that you are talking of you would require survey quality gps AND DGPS with correction data for your locality.
2) Suppose you have tracked certain part of your town oryour route from your home to airport near your city. Then you fly to another city and then restart the GPS device. At that point the device generally has to re-initiate itself to capture/detect the satellites ( which it has to do anyway incase you turn off and then switch on a gps device - atleast in some devices that I have seen ). Anyway after it has done that, it calculates the Longitude and Latitude and hence the current position. What happens in this case is, the GPS device draws a straight line from City A to City B. Is there a way to avoid that / tackle that ?
That is a function of the handheld (which is a small computer with all sorts of features attached to an internal gps) not a function of the gps. You will have to check your particular handheld gps user manual on how to stop and start new traces.
Any pointers ? Thanks in advance. Cheers!Pradeepto
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