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複数のGeotiffを1枚にマージする(gdal_merge.py)

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自分用メモ。
参考:ここ公式マニュアル

バーチャルラスターをつくるのが望ましいもののどうしても一枚の画像にマージしたいときもある。

gdal_merge.py -o OUTPUT.tif -ot Float32 -co COMPRESS=LZW -co BIGTIFF=YES INPUT1.tif INPUT2.tif INPUT3.tif

-otはByte, Int16なども可
-co COMPRESS=LZW はしないと圧縮されないためとんでもない大きさのtifが生成される
-co BIGTIFF=YES 出力データが4GB以上の際は必須

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