ReadStack – Multispectral Image

ReadStack reads several separate images and outputs one multispectral image. The output has as many spectral bands as all the input files together. The bands are in the order the files are listed: the first file's bands get the lowest band numbers, and the last file's bands get the highest.

The “filenames” box accepts many names. When you browse an image folder, you can select several images at once. Use the buttons next to the list:

• Add browses for more files. Select it more than once to add images from different folders.
• Clear removes all the names from the list.
• Count shows how many files are in the list.

You can combine image files of any supported type, as long as they all have the same spatial dimensions (the same number of pixels and scanlines) and the same number of bits per band. Each image can have any number of bands.

• window: reads only that rectangular region of each image. See Window Arguments.
• calibration: calibrates the data as it is read, using the calibration file in the images' folder. If there is no calibration file, the job stops. See Read Calibrated Images.

To save the result, see Multispectral Image in ENVI. To analyze it, see PCA.