Linux command
gdaladdo 命令
文本
复制后可按需替换文件名、目录或参数。
常用示例
Build overviews
gdaladdo [image.tif]
Build specific levels
gdaladdo [image.tif] [2] [4] [8] [16]
Build using average resampling
gdaladdo -r average [image.tif]
Build external overviews
gdaladdo -ro [image.tif]
Build with compression
gdaladdo --config COMPRESS_OVERVIEW JPEG [image.tif]
说明
gdaladdo builds or rebuilds overview images (also called pyramids) for raster datasets. Overviews are downsampled versions of the original image at multiple resolutions, enabling efficient display and processing at different zoom levels. Without specified levels, the tool generates default pyramids. Custom levels define the subsampling factors (e.g., 2, 4, 8 means half, quarter, eighth resolution). Different resampling methods affect quality and performance: nearest is fastest, average produces smoother results, and cubic provides highest quality. Overviews can be stored internally in the file or as separate .ovr sidecar files. Compression settings reduce overview file size. gdaladdo is essential for working with large imagery in GIS applications and web mapping services.
参数
- -r _method_
- Resampling method (nearest, average, gauss, cubic).
- -ro
- Create external overview file.
- --config _key_ _value_
- Set configuration option.
- -b _band_
- Build for specific band only.
- -clean
- Remove existing overviews.
FAQ
What is the gdaladdo command used for?
gdaladdo builds or rebuilds overview images (also called pyramids) for raster datasets. Overviews are downsampled versions of the original image at multiple resolutions, enabling efficient display and processing at different zoom levels. Without specified levels, the tool generates default pyramids. Custom levels define the subsampling factors (e.g., 2, 4, 8 means half, quarter, eighth resolution). Different resampling methods affect quality and performance: nearest is fastest, average produces smoother results, and cubic provides highest quality. Overviews can be stored internally in the file or as separate .ovr sidecar files. Compression settings reduce overview file size. gdaladdo is essential for working with large imagery in GIS applications and web mapping services.
How do I run a basic gdaladdo example?
Run `gdaladdo [image.tif]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -r _method_ do in gdaladdo?
Resampling method (nearest, average, gauss, cubic).