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Yes, you'll need that. There is a good tutorial at the help section of AG - 'About the ArcGIS Network Analyst extension tutorial'. You can also use Spatial Analyst for more control.1 point
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6 week? hmm. The sorcery of finding nearest neighbor/shortest path is subjected to a topic called 'Computational Geometry'. In AG you'll need to use network analyst. But before that you'll need all the routes in vector format, not aerial photo. You'll also need a good network dataset, and for that a good amount of field work. Best o' luck!1 point
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do you have the network analyst installed?1 point
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Mostly, I use landsat TM, and using Canny Method, see here :1 point
