is-cog

This package is under development. Please report any issues here: https://github.com/geotiff/is-cog/issues

is-cog

Super Light and Fast Method for Checking if a TIFF is a Cloud Optimized GeoTIFF

how does it work

1. It uses id-tif to check if the file is a TIFF.
2. If it is a TIFF, it uses is-geotiff to check if the file is a GeoTIFF.
3. If it is a GeoTIFF, it uses has-bytes to check if the bytes associated with the following tags are present: TileWidth, TileLength, TileOffsets, and TileByteCounts.

install

npm install is-cog

usage

const fs = require("fs");
const isCOG = require("is-cog");

const buffer = fs.readFileSync("./landsat_scene.tiff");

const { is_cog, is_geotiff, is_tiff } = isCOG({
    data: buffer,
    debug: false // set debug to true for increased logging
});
// is_cog is true
// is_geotiff is true
// is_tiff is true