Separating polygons within layer and measure line through each polygon using ArcGIS Desktop?

Question

I have 3 layers of polygons, each layer with multiple polygons spatially separated, although the layer only counts it as 1 polygon. I have a layer with a line going through these polygons.

What is the best way to measure the line running through each polygon? I would like a measurement for each individual polygon in each layer, even though each layer is only considered as one whole polygon, I want it to be separated. I prefer not to do it manually, as there are over 500 polygons.

Above is a picture of a section of the map I have so far.

I'm using ArcMap 10.1.

Answer 1

You need to make them individual polygons, use Multipart to Single Part to explode the geometry into individual geometries.

Intersect the line with the single part polygons which will join attributes of the polygons to the lines; in basic and standard license you are limited to two layers but that should be fine for this task.

After the intersect you should have lines that are contained within each polygon to perform further analysis on.

Answer 2

1. Merge 3 polygon layers into 1 using analysis-merge, output to feature class in GDB
2. Intersect merged with polyline layer using analysis-intersect, output (polyline) to feature class in GDB
3. Use Summary Statistics (Analysis) to summarise shape_length (sum) using polygon OBJECTID as case field.