COPYRIGHT NOTICE The Visibility Modeling Tool (VMT) is copyrighted software. Copyright 2004 - 2009 California Institute of Technology. Developed with U. S. Government sponsorship under contract with the National Aeronautics and Space Administration. All Rights Reserved. Permission to use, copy and distribute this software and its documentation for academic and/or research purposes, without fee and without a written agreement is hereby granted, provided that the above copyright notice, this paragraph and the following three paragraphs appear in all copies. Reuse of all or part of the software contained here for commercial purposes is strictly prohibited. The California Institute of Technology makes no proprietary claims to the results, prototypes, or systems supporting and/or necessary for the use of the research, results and/or prototypes for academic and/or non-profit research uses only. However, to the extent that any software and system built in collaboration with industry partners may incorporate proprietary designs of the industry partners, it is possible that certain restrictions may be imposed on the proprietary information Results received from this tool are designed for non-profit, scientific or experimental purposes only, and is an approximation based on information entered. In no event shall California Institute of Technology be liable to any party for direct, indirect, special, incidental or consequential damages, including lost profits, arising out of the use of this software and its documentation, even if the California Institute of Technology has been advised of the possibility of such damage. The California Institute of Technology specifically disclaims any warranties, including the implied warranties or merchantability and fitness for a particular purpose. The software and documentation provided hereunder is on an "as is" basis, and the California Institute of Technology has no obligations to provide maintenance, support, updates, enhancements or modifications.