Jim Gem English Area Grid Forestry Suppliers INC

use to determine the area of any flat surface in english measurement units scales and ratios include the following 1 in 1 in 1 in 1 ft 1 in 1 yd 1 in 500 ft 10 56 ins mi 1 6 000 1 in 1 000 ft 5 28 ins mi 1 12 000 1 in 1 320 ft 4 0 ins mi 1 15 840 1 in 1 667 ft 3 167 ins mi 1 20 000 1 in 2 000 ft 2 64 ins mi 1 24 000 1 in 3 334 ft 1 58 ins mi 1 40 000 1 in 5 280 ft 1 in mi 1 63 360 two edge scales inches to tenths and inches to 16ths are included it may also be used with any other map scale but first you must figure the conversion factor available in standard size or super size how to use the english area grid to use randomly place grid over area to be computed and count the dots falling within that area count every other dot that falls on the boundary of the area multiply the number of dots counted by the proper conversion factor for the scale you are using to obtain total area example using a map scale of 1 1 320 ft 1 320 1 742 400 sq ft sq in of area grid 1 742 400 43 560 sq ft per acre 40 acres sq in of area grid 40 acres 64 dots per sq in of area grid 0 625 acres per dot conversion factor each dot represents 0 625 acres if the dot total of an area is 50 dots multiply 50 by the conversion factor 50 x 0 625 31 25 acres within area this can be done using any map scale