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" = 20' 1" = 50' 1" = 100' 1" = 200' 1" = 400' 1" = 1000' 1" = 2000'

      EXAMPLE (SI Units)

      Limiting rms

      Scale Value in Meters

      1 cm = 5m 1 cm = 10m 1 cm = 100m 1 cm = 200m

   2. (B) Class II. The rms shall be twice that required for Class I.
   3. (C) Class III. The rms shall be three (3) 0.2' 0.5' 1.0' 2.0' 4.0' 10.0' 20.0'

0.125 0.250 2.50 5.00 20 CSR 2030-20

times that required for Class I.

1. (2) Vertical Accuracy.

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

AUTHORITY: section 327.041, RSMo Supp. 1993.* This rule originally filed as 4 CSR 30- 20.020. Original rule filed May 3, 1994, effective Dec. 30, 1994. Moved to 20 CSR 2030-20.020, effective Aug. 28, 2006. Nonsubstantive change filed Oct. 21, 2015, published Dec. 31, 2015.

*Original authority: 327.041, RSMo 1969, amended 1981, 1986, 1989, 1993, 1995, 1999.