cogeotiff

用于处理云优化GeoTIFF（COG）的工具

• 完全基于JavaScript，支持浏览器和nodejs
• 延迟加载Tiff图像和元数据
• 支持超大100GB+的COG
• 使用GDAL Tiff优化，通常每个瓦片只需一到两次读取！
• 支持从URL、文件、Google Cloud或AWS S3加载Tiff
• 已用于LINZ的底图生产环境，数十亿瓦片从COG中提取！

使用方法

使用fetch从URL加载COG

import { SourceHttp } from '@chunkd/source-http';
const source = new SourceHttp('https://example.com/cog.tif');
const cog = await Tiff.create(source);
const img = cog.images[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
// Tiff tags can be directly accessed too
img.value(TiffTag.GdalNoData); // "-9999"
// or tag metadata can be fetched
img.tags.get(TiffTag.GdalNoData); 
/
{
  type: 'inline', // How the tag was read "inline" vs "lazy"
  id: 42113, // Tag Id (@see TiffTag)
  name: 'GdalNoData', // Tag Name
  count: 6, // Number of values
  value: '-9999',
  dataType: 2, // Char
  tagOffset: 194 // Bytes into the file where the tag was read.
}
*/

命令行界面

npm i -g @cogeotiff/cli

cogeotiff 信息

显示关于 COG 的基本信息

cogeotiff info webp.cog.tif

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 转储

导出图像的所有瓦片（警告 如果对大型 cog 执行此操作，将生成数百万个文件。）

cogeotiff dump --image 2 --output output

构建

需要 NodeJs >=24.0

使用 n 或 fnm 来管理 NodeJs 版本

# Download the latest nodejs
n latest
Install node deps
npm install
Build everything into /build
npm run build
Run the unit tests
npm run test

--- Tranlated By Open Ai Tx | Last indexed: 2026-07-28 ---