Thanks! I’m glad other folks are taking a look and checking that I’m not on the wrong track. I spent some time working on the roads on Rota by hand (two islands south toward Guam), and think it’s pretty much a waste of time compared to just doing a new import.

I think I need to track down someone who has done this kind of import recently and have them do the heavy lifting, instead of me re-inventing the wheel. I’d hate to inadvertently mess things up by lack of experience.

Thanks for taking a look! I’ll take some extra GPS traces when I head up to Saipan next week; so far the imagery has been pretty good but I’ll make a point of doing some systematic comparison work. I’ll try to pull in some other imagery options, too.

I’m going to check with the government on Saipan to see if they’ve got a publicly available data layer we can use instead of TIGER; I suspect the 2012 TIGER data reflects updated data provided by them (much like Guam did a few years back). The 2012 TIGER is a huge improvement over the 2005 TIGER data, from what I’ve seen.