Intersecting Lines and Polygons

[ElijahMeyer]

Hello all,

I am having a problem with an intersection. I have intersected two shape files, one a line file of roads, and the other a polygon of flooded areas. The intersection worked correctly and only left me with the pieces of the roads that would be affected by the flood. The problem I am having is there is no field in the table that has a length of the new intersected pieces. The only lengths in the table are that of the polygon and original road lengths. I need to create a field that has the length of each small piece of road. If I have not been very clear, please let me know. Thank you for any help.

[DanPatterson_Retired]

You can add a new field (double type) and use calculate geometry  to get values for file.  You can then query the table for the size parameter you want

[XanderBakker]

If you write the output to a file geodatabase the length field will be filled automatically.

[JoeBorgione]

One more item you might consider: Before you perform your intersection, add a field of type Double called Length_Original (or something to that effect). Calc it to equal (wait for it...) Shape Length.

Then once you follow either Dan's or Xander's suggestion, you can figure out what percentage of the road will be under water....