Map Accuracy Standards

PURPOSE: This rule prescribes minimum acceptable mapping standards. (1) Horizontal Accuracy. (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' 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 1 cm= 5m 0.125 1 cm= 10m 0.250 1 cm=100m 2.50 1 cm=200m 5.00 (B) Class II. The rms shall be twice that required for Class I. (C) Class III. The rms shall be three (3) times that required for Class I. (2) Vertical Accuracy. (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. (B) Class II. The rms error may be twice that required for Class I. (C) Class III. The rms error may be three (3) times that required for Class I. (3) Mixed Accuracy. A map may be compiled that complies with one (1) class of accuracy in elevation and another in planimetry. AUTHORITY: section 60.510(7), RSMo 2016.* This rule originally filed as 10 CSR 30-6.020. Original rule filed May 3, 1994, effective Dec. 30, 1994. Moved to 2 CSR 9064.020, effective Aug. 28, 2013. *Original authority: 60.510, RSMo 1969, amended 2012, 2013.