► 1. The distance between two points in a raster data layer calculated as the number of cells crossed by a straight line between them.

► 2. The distance between two points in a vector data layer calculated as the length of the line between them.

► 3. The distance between two points in a raster data layer calculated as the sum of the cell sides intersected by a straight line between them.

The distance between two points in a raster data layer calculated as the sum of the cell sides intersected by a straight line between them.