As a line is composed of an infinite number of points, confidence limits can be described by what is known as an epsilon (ε) or Perkal band at a fixed distance on either side of the line (Figure 1).
The width of the band is based on an estimate of the probable location error of the line, for example to reflect the accuracy of manual digitizing. The epsilon band may be used as a simple means for assessing the likelihood that a point receives the correct attribute value (Figure 2).
Student is abel to explain and apply quality assessment procedures (level 1, 2 and 3).