Different distance in different projections

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07-07-2011 11:57 AM
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On the daily basic I am using NAD_1983_StatePlane_New_York_Long_Island_FIPS_3104_Feet projection, but in order to overlay my network dataset with other data in the web application I had to reproject it to WGS_1984_Web_Mercator_Auxiliary_Sphere. After reprojecting my base feature class and building network dataset in a new projection my distance measurement changed. The distance which in  NAD_1983 is 4200 feet, in WGS_1984 is 1700 feet. I know the real distance is 4200 feet, but I do not know how to make my network dataset in WGS_1984 returns true distance. Any advice?
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Thanks a lot! This solution works 🙂
Answering for your question about projection on the fly: it does not work well in my web application, so it was not a good solution.
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