PURPOSE: This rule prescribes minimum acceptable mapping standards.

1. (1) Horizontal Accuracy.

   1. (A) Class I. The root mean square (rms) error of a map product shall be less than 0.01 of one inch (1”) on the map or in the case of a metric map, 0.025 of one centimeter (1 cm) on the map.

      EXAMPLE (Customary Units) Limiting rms Scale Value in Feet - 1” zz 20’ 0.2’ 1” = 50’ 0.5’ 1” = 100’ 1.0’ 1” = 200’ 2.0’ 1” = 400’ 4.0’ 1” = 1000’ 10.0’ 1” = 2000’ 20.0’

      EXAMPLE (SI Units) Limiting rms

      Scale Value in Meters

      lcm= 5m 0.125 0.250 lcm= 10m 1 cm = 1OOm 2.50 5.00 1 cm = 200m

   2. (B) Class II. The rms shall be twice that required for Class I.
   3. (C) Class III. Therms shall be three (3) times that required for Class I.

2. (2) Vertical Accuracy.

   1. (A) Class I. For Class I maps rms error in elevation shall be less than one-third (l/3) of the indicated contour interval for well-defined points only, and one-sixth (l/6) of the contour interval for spot heights.
   2. (B) Class II. Therms error may be twice that required for Class I.
   3. (C) Class III. Therms error may be three (3) times that required for Class I.

3. (3) Mixed Accuracy. A map may be compiled that complies with one (1) class of accuracy in elevation and another in planimetry.

   A&h: section 60.510(7), RSMo (1986).* Original rule filed May 3,1994, effective Dec. 30,1994. *Original authority 1984.

   CODEOF STATE REGULATIONS 10 CSR 30-6