基于GDAL大于2G遥感图像的快速浏览

Quick browsing of massive remote sensing image based on GDAL

快速显示与浏览大的遥感图像是遥感图像处理与分析软件的一个重要的功能。利用GDAL的快速高效的文件读取功能,动态地分块从文件中读取图像块到内存,动态地建立金字塔结构,从而能快速地显示大的遥感图像。放大、缩小和漫游操作实现了渐变的效果,能给用户非常快速和平滑的感觉。

Quick display and browse of a large remote sensing image is an important feature for remote sensing image processing and analysis software. It can quickly display a large remote sensing image by adopting fast and efficient read/write function of Geospatial Data Abstraction Library （GDAL） to dynamically read image block from im- age file to memory and dynamically build image pyramid structure in memory. The effect of ＂gradual change＂ is im- plemented in the operations of Zoom in, Zoom out and Roaming, so users feel very fast and smooth when they do these operations.