Intersection-Matrix-Calculation.md

@@ -108,14 +108,26 @@ The IM for the two disjoint geometries of dimension .one is (1) FF1FF0102, if bo
 The IM for two LineStrings (not LinearRings) is  
 I ∩ I = 0, if two line segments intersect at the interior of both LineStrings, else .false  
 I ∩ B = 0, if the interior of one line segment intersects an endpoint of another line segment, else .false  
-I ∩ E = 1, if part of one line segment of the first LineString lies outside of the second line String, else .false (Note this value cannot be 0.)  
+I ∩ E = 1, if part of one line segment of the first LineString lies outside of the second LineString, else .false (Note this value cannot be 0.)  
 B ∩ I = 0, if the interior of one line segment intersects an endpoint of another line segment, else .false    
 B ∩ B = 0, if the endpoints of the LineStrings meet at one more points, else .false   
 B ∩ E = 0, if the two endpoints of the first LineString do not both lie on the second LineString, else .false    
-E ∩ I = 0, if part of one line segment of the second LineString lies outside of the first line String, else .false (Note this value cannot be 0.)    
+E ∩ I = 1, if part of one line segment of the second LineString lies outside of the first LineString, else .false (Note this value cannot be 0.)    
 E ∩ B = 0, if the two endpoints of the second LineString do not both lie on the first LineString, else .false     
 E ∩ E = 2  
 
+The IM for a LineString (not LinearRing) and a LinearRing, in that order, is  
+I ∩ I = 0, if line segments from each geometry intersect at the interior of both, else .false  
+I ∩ B = 0, .false  
+I ∩ E = 1, if part of one line segment of the LineString lies outside of the LinearRing, else .false (Note this value cannot be 0.)  
+B ∩ I = 0, if at least one of the endpoints of the LineString intersects the LinearRing, else .false    
+B ∩ B = 0, .false   
+B ∩ E = 0, if the two endpoints of the LineString do not both lie on the LinearRing, else .false    
+E ∩ I = 1 (Note part of the LinearRing must lie outside of the LineString)    
+E ∩ B = .false     
+E ∩ E = 2  
+If the order of the two geometries is reversed, the intersection matrix would be the transpose of the above.  
+
 **The dimension of the intersection of two geometries, one of which is dimension .one and the other dimension .two, is either .zero, .one, or .false**
 
 Use the SweepLineIntersector algorithm.  If two segments, one from each geometry, overlap on any sub-segment, return .one.  If a segment from the one-dimensional geometry crosses into the interior of the polygon, return .one.  If the one-dimensional geometry is completely contained in the polygon, but not completely contained in one of its holes, return .one.  If the one-dimensional geometry is completely contained in a hole of the polygon, return .zero.  If the two geometries intersect at one more points, return .zero, else return .false.