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How to update data of layers?

Question asked by maryann123 on May 2, 2014
Latest reply on May 6, 2014 by maryann123

For the historical study I am conducting, I have three layers with roads in 2000, 2008 and 2012 respectively. Only the data for 2000 is complete- i.e. there are additional segments of roads in 2000 that are not present in data for 2008 and 2012. I'm positive that roads did not vanish between 2000 and 2008 :P I would like to add the length of the additional roads from 2000 to that of 2008 and 2012, so that my data is correct and complete. How do I go about it?

Time is not in my favor and I would really appreciate some help. A BIG thanks to all those who would like to help me out :)