cogeotiff

Tools to work with Cloud optimized GEOTiff

• Completely javascript based, works in the browser and nodejs
• Lazy load COG images and metadata
• Supports huge 100GB+ COGs
• Uses GDAL COG optimizations, generally only one or two reads per tile!
• Loads COGs from URL, File, Google Cloud or AWS S3
• Used in production for LINZ's Basemaps with billions of tiles fetched from COGs!

Usage

Load a COG from a URL using fetch

import { CogSourceUrl } from '@chunkd/source-url';

const source = new CogSourceUrl('https://example.com/cog.tif');
const cog = await CogTiff.create(source);

const img = cog.getImage(0);
if (img.isTiled()) throw new Error('Tiff is not tiled');
const tile = await img.getTile(2, 2); // Fetch a tile from a tiff x:2, y:2

Scripts

npm i -g @cogeotiff/cli

cogeotiff info

Display basic information about COG

cogeotiff info --file webp.cog.tif

Output:

COG File Info - /home/blacha/Downloads/tif-new/bg43.webp.cog.tif

    Tiff type       BigTiff (v43)
    Chunk size      64 KB
    Bytes read      64 KB (1 Chunk)

  Images
    Compression     image/webp
    Origin          18550349.52047286,-5596413.462927464,0
    Resolution      19.10925707129406,-19.10925707129415,0
    BoundingBox     18550349.52047286,-5713820.738373496,19098250.139221005,-5596413.462927464
    Info
                Id      Size                    Tile Size               Tile Count
                0       28672x6144              56x12                   672
                1       14336x3072              28x6                    168
                2       7168x1536               14x3                    42
                3       3584x768                7x2                     14
                4       1792x384                4x1                     4
                5       896x192                 2x1                     2
                6       448x96                  1x1                     1

  GDAL
    COG optimized   true
    COG broken      false
    Tile order      RowMajor
    Tile leader     uint32 - 4 Bytes
    Mask interleaved  false

cogeotiff dump

Dump all tiles for a image (Warning if you do this for a large cog this will create millions of files.)

cogeotiff dump --file webp.cog.tif --image 2 --output output

cogeotiff tile

Load and dump a individual tile

cogeotiff tile --file webp.cog.tif --xyz 1,1,1

Building

This requires NodeJs > 12 & Yarn

Use n to manage nodeJs versions

# Download the latest nodejs & yarn
n latest
npm install -g yarn

# Install node deps
yarn

# Build everything into /build
yarn run build

# Run the unit tests
yarn run test