scottness

Proper projection to use for network dataset

Discussion created by scottness on Dec 11, 2012
Latest reply on Dec 12, 2012 by jsandhu-esristaff
Hello,

I have a regular 20km x 20km vector mesh grid that I wish to use as the basis for a network dataset. Each line in the grid has a cost value representing travel time. I created this grid in a Lambert Azimuthal Equal-Area projection and each line segment is exactly 20km long when viewed in this projection. As the basis for a network dataset, I hope to use the grid to calculate shortest routes between two points on the grid. However, I've been told that equal-area is a bad choice for distance calculations, and I should use an equidistant projection instead.

Is the solution as simple as projecting my equal-area grid to an equidistant projection and recalculating my routes? Or do I need to create a new grid from scratch with an equidistant projection? If I need to create a new grid, is there a tool for doing so? (I converted the equal-area grid from a previous dataset that was in equal-area).

Many thanks for any help.

Scott

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