20 



MISC. PUBLICATION 2 2 5, U. S. DEPT. OF AGRICULTURE 





Table 31. — Ratios for 



customary map sea 



les 





Scale 1 to— 



Inches per 

 mile 



Miles per 

 inch 



Feet per 

 inch 



Meters per 

 inch 



Feet per 

 \-2<s inch 



Acres per 

 square inch 



Square miles 



per square 



inch 



600 



1,200 



105.6 

 52.8 

 25. 344 

 13.2 

 12 



6.336 

 4 



3.168 

 2.64 

 2.53 

 2 



1.408 

 1 



.704 

 .66 

 .507 

 .127 

 .063 

 .025 



0. 0095 

 .0189 

 .0395 

 .0758 

 .0833 

 .1578 

 .25 

 .3 

 .38 

 .39 

 .5 



.7102 

 1 



1. 4205 

 1.5152 

 1. 9729 

 7. 8914 

 15. 7828 

 39. 4571 



50 



100 



208 



400 



440 



833 



1,320 



1,584 



2,000 



2,083 



2,640 



3,750 



5,280 



7,500 



8,000 



10,417 



41, 667 



83, 333 



208, 333 



15.2 



30.5 



63.5 



121.9 



134.1 



254.0 



402.3 



482.8 



609.6 



635.0 



804.7 



1, 143. 



1, 609. 3 



2, 286. 



2, 438. 4 



3, 175. 



12, 700. 



25, 400. 1 



63, 500. 1 



2 

 4 



8.3 

 16 



17.6 

 • 33.3 

 52.8 

 63.4 

 80 

 83.3 

 105.6 

 150 

 211.2 

 300 

 320 

 416.7 

 1, 666. 7 

 3, 333. 3 

 8, 333. 3 



0.06 

 .23 

 1.00 

 3.67 

 4.44 

 15.93 

 40.00 

 57.60 

 91.83 

 99.64 

 160 

 322 

 640 

 1,291 

 1,469 

 2,491 



0. 0001 

 .0004 

 .0016 

 .0057 

 .007 

 .0249 

 .0625 

 .0900 

 .1435 

 .1557 

 .2500 

 .5031 

 1.00 

 2.02 

 2.30 

 3.89 

 62.3 

 249 

 1,556 



2,500 



4,800 



5,280 



10,000 



15,840 



20,000 



24,000 



25,000- 



31,680 



45,000 



63,360 



90,000 



96,000 



125,000 



500,000 



1,000,000 



2,500,000 







Table 32. — Vertical aerial photo scale relations 



Representative 

 fraction 



Inches per 

 mile 1 



Representative 

 fraction 



Inches per 

 per mile ' 



1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 



31,680 



24.000 



23,500 



23,000 



22,500 



22,000 



21,500 



21,120 



21,000 



20,500 



20,000 



19,500 



19,000 



18,500 



18,000 



17,500 



17,000 



16,500 



16,000 



15,840 



2.0 



2.640 



2.696 



2.755 



2.813 



2.880 



2.947 



3.0 



3.017 



3.091 



3.168 



3.249 



3.335 



3.425 



3.520 



3.620 



3.727 



3.840 



3.960 



4.0 



1 

 1 

 1 

 1 



1 

 1 

 1 

 l 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 



15,500 



15,000 



14,500 



14,000 



13,500 



13,000 



12,672 



12,500 



12,000 



11,500 



11,000 



10,560 



10,500 



10,000 



9,500 



9,051 



9,000 



8,500 



8,000 



7,920 



4.088 



4.224 



4.370 



4.526 



4.693 



4.874 



5.0 



5.069 



5.280 



5.510 



5.760 



6.0 



6.034 



6.336 



6.669 



7.0 



7.040 



7.454 



7.920 



8.0 



1 Scale in inches per mile=representative fraction X 63,360 (constant). 



