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1

You use a UTM zone when your area of interest fits completely within it or very nearly so. A UTM zone is not appropriate when your area of interest spans several zones such as in your case. A little overlap into a neighboring zone might be ok, but the further away from the zone you pick, the more distortion there will be and the more it matters. I found this ...


3

Don't choose UTM, end of story. Many large countries choose a single sensible projection for some tasks. Victoria, a small state in my country was extremely foresighted in the late 90's and chose a Lambert Conformal Conic projection suitable for state-wide usage when they were undergoing a datum shift (ADG84/66 to GDA94), rather than hobble along with ...


2

I would suggest the best approach is to find out the primary projection that the national mapping or geomatics agency of the area in question usually uses and use that. I live in canada, covering a lot of UTM Zones, and when not geographic (lat/Long) the provinces generally each use a projection that is appropriate for the size and shape of their region. BC ...


2

The data in the attribute table will not change when you reproject the geometries. After reprojection, you have to add new columns with $x and $y values. These will be in the coordiante system at the moment when you add them. You can delete the old columns with coordinates if they are not useful to you anymore.


0

The thing that you want to do is to solve Travelling Salesman Problem or one of its variations. 7000 points is a very difficult task. And you may spent a lot time calculating it (depending on software and algorithm) There is an open-source implementation of Genetic algorithm (not the most advanced one) in pgRouting extension for PostGIS. Another option is ...



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