I want to run a cost-distance analysis to calculate the shortest distance without crossing land between all cells in a grid overlaid on a harbour. I've made a cost raster with 50 m resolution and given all the land cells a very high cost (10000) and the sea cells a cost of 1. I downloaded the Cost-Distance Matrix tool from the ESRI website. It works fine for a small test dataset of 3 points but chugs unbelievably slowly for my full grid dataset of about 700 points. From the time it took to run the small dataset I worked out it would take about 40 days to run the full set!! Any ideas how to speed it up? Many thanks.
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