|
I n a GIS, distances are computed from coordinates. As explained earlier, the coordinate systems affect the coordinates of a point, and therefore also affect distance computations. We will illustrate this in the first exercise. We will then show that length calculation along a line is an extension of distance calculation between two points. In order to use the stored points for a line to compute its length, we are faced with the challenge of finding points in a large database efficiently. An approach to this search problem will also be discussed.
|
|
|
Measure the distance between two points.
(288530, 740510) ground units, 1:1000
|
|||
|
|||
|