对整幅图片做PCA变换，提取光谱特征，消除噪声，平滑边缘，易主成分重新绘制图像-Pictures do the whole PCA transform, extract spectral features, remove noise, smooth edges, easy to re-draw the image principal component

基于IDL语言对于tiff格式影像进行多种处理，包括显示、PCA、傅里叶变换等等，对于初步学习IDL语言的遥感人很有用-tiff file process based on idl