ASTER数据真彩色合成。利用ASTER数据本身无法合成真彩色图像，但可以经过一定的算法处理，对ASTER数据进行变换，之后再进行图像合成，可以合称为真彩色图像。利用IDL语言编写-True color composite ASTER data. ASTER data itself can not be synthesized using the true color images, but after a certain algorithm can deal with the ASTER data transformation, and then the image synthesis, can be collectively referred to as true color images. Using IDL language