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Looks like email that I sent yesterday didn't go through. Here it is again: Hello Listserv, I have point dataset of ship trips from one port to another. I want to calculate the shortest distance between each port pair over water. There are thousands of voyages, and 5,000 unique ports from all over the world. One of the approach I can use in ArcGIS is to run the Cost-Path tool having water/land as a cost raster to make a path only on water. But I assume that the Cost-Path approach would be little tedious for a large dataset. I wonder if anyone in this forum has a suggestion to calculate a shortest distance between two points having restricted path. I will highly appreciate your feedback. -- Milan Budhathoki ------------------------------------------------------------------------- This list (NEARC-L) is an unmoderated discussion list for all NEARC Users. If you no longer wish to receive e-mail from this list, you can remove yourself by going to http://listserv.uconn.edu/nearc-l.html.