You might notice that I have tried recently wired route calculations with JOSM and PostGIS and showed them at my site .

However, I myself often forget what I was doing, so I make "500-yen book", that includes the know-how.

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I have previously made a book whose title was "Let's DIY GIS using PostGIS" and now I think the book is useful.

Above all, "for me".

I could complete the build-ups and operations of the things in the past, in the shortest time, easily.

Even when I have to ask others to do that, what I just do is to say "Read it and ask me, when you can't" and pass the file to them.

Sometimes, I had a feeling to be given a "convenience store lunch box" with a donation.

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From the view of "be good for me, and might be good for anyone",

my "500-yen book" are going to be developed.