OrbSeekr Utility #002

STAC ↔ Asset Diff

Check whether a Item tells the truth about its : we read only the file header and compare it with what the Item declares.

Privacy

With an Item URL, our server fetches the Item and reads only the first bytes of each asset (strict size budget). Nothing is stored or logged.
With a local file, the header is read entirely in your browser; the file is never uploaded.
Query-string values (e.g. signed-URL tokens) are redacted in the result.

CRS: The coordinate system that says where pixels are on Earth.座標の基準（地図上の位置の決め方）
proj:transform: Six numbers that map pixel rows/columns to map coordinates.画素の位置を地図座標に変換する6つの数値
proj:shape: The image size as [rows, columns].画像の大きさ（行数・列数）
nodata: The pixel value that means ‘no data here’.「データなし」を表す画素値
dtype: How each pixel value is stored, e.g. uint16 or float32.画素値の保存形式
gsd: Nominal ground size of one pixel in metres.1画素が地上で何mか（公称値）