Grid System Mapping Activity
A grid system is a controlled layout of an area into arbitrary squares. One or two meter (m) squares are most frequently used. One purpose of the squares is to provide convenient sized excavation or collection units. At the same time, then corners of the squares provide reference points fro the precise location of artifacts and features within the square. Typically we measure things from the southwest corner of a square.
Each square receives its designation from grid lines which cross at the southwest corner. Grid lines are not drawn on this site map; using the information provided along the boundary of the site you must create the grid. When locating a point, you write the north-south grid line name first (e.g., 720 North (N), 490 East (E)).
Within a given grid unit an artifact or feature can be located by triangulation. Triangulation consists of two horizontal measurements from the center of the item to be recorded to two corners of the grid. Through triangulation you hope to determine the precise location of an object.
Answer the following questions:
1. What feature number is located at 730 N, 478 E?
2. Draw four 2 x 2 meter units at
740N, 482E
722N, 484E
728N, 472E
746N, 476E
3. What feature numbers are located in each unit?
4. Give a precise location of each feature.