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  1. Hello all, Most of the LROC CDRNAC products has both '.img' and '.tif' files. I am assuming that both the files contain images of the same region but the '.img' files have meta data. I have observed that '.img' are typically 300MB and '.tif' files are 30MB in size. I have the following two questions, 1. Why is the '.img' file typically 10 times larger than the '.tif' files ? Is the meta data some huge in size? 2. Some products, for example M1185002263RC does not have a 'tif' file. Is it not available for some products? I am actually creating a mosaic area of 10x10 Km using LROC images of 1.5m/pixel resolution (approx) by stitching them together. I am using MATLAB for this purpose and it can only read '.tif' files. Any help or suggestion would help me in moving forward. Thank You, Shyam.

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