If the Pleiades product is very large, it might happen that the image is actually splitted into several Jpeg2000 files, also called mega-tiles. Since the area of interest might span two or more mega-tiles, it is convenient to stitch together these tiles so as to get the entire scene into one Monteverdi dataset. To do so, one must first open all mega-tiles in Monteverdi, as described in section 3.1.1, page 132. Once all mega-tiles are opened as shown in figure 3.4, page 148.
Once this is done, one can use the Mosaic Images module from the File menu. Simply append all mega-tiles into the module and run it: the module will look for the RiCj pattern to determine the mega-tiles layout, and will also check for consistency, e.g. missing tiles or mega-tiles size mismatch. Upon success, it generates a new Pleiades image dataset, which corresponding to the entire scene, as shown in figure 3.4, page 148. One can then use this dataset as a regular Pleiades dataset.