Tutorial: Combining Separate Image Files into a Single Multispectral Image File
Requirements: MultiSpec application & images titled “LE7_20000606_Indy_subset_Bn.tif”
One can use the "Logically Linking" capability in MultiSpec to link several image files together
to be treated as one image file in an image window and/or create a new image file that
incorporates all of the separate images. For example many times one will receive Landsat images
from the EROS Center by electronic download that contains one file for each of the 7 (TM), 8
(ETM+), or 10 (LC8) bands. This exercise will illustrate how to do this.
Beginning with the 3.14.2013 version of MultiSpec there is a new approach to combine separate
image files which takes fewer steps. The multiple selection (easiest) approach is described in
section 5.1. The second single selection approach is described in section 5.2.
Section 5.3 describes how to create a single image file which includes the selected individual
image files.
Please refer to section 5.4 if not all of the images files to be linked are at the same spatial
resolution. This may the case for the Landsat thermal bands. Currently though, most of the
thermal data files in the Landsat image data sets that are downloaded from the EROS Center
have already been re-sampled to the sample spatial resolution as that for the reflective data.
Section 5.5 describes how MultiSpec automatically links files in HDF or HDF5 format. An
ASTER data set is used for illustration.
Section 5.6 describes how MultiSpec can automatically links files in FAST-L7A Format.
NOTE: One can also link multiple image files together that represent multi-temporal data from
the same location, provided that line and column numbers for the given pixel ground locations in
the separate image files from each of the times have been made to correspond with each other.