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#gps metadata
記事 01
ジオタグとは？位置情報を持つ写真の裏側にあるタグ
Geotagging is the act of storing a location inside a photo file itself. Here is exactly which EXIF tags hold it, and what happens to them when you upload.
記事 02
写真ファイルから GPS 位置情報を取り出す方法
The coordinates are already inside the file. Here is how to read them out, why the number arrives without its minus sign, and which tags tell you whether the location is a measurement or a guess.