The Accuracy Star Measurement Utility on the Control Points tab is a quick tool to calculate the Height offset from the slant distance. This height offset is later used in the Accuracy Estimation tool.

Figure 1: Accuracy Star Measurement Utility

Using the Accuracy Star Measurement Utility

1. When collecting data in the field, measure the Slant Height of the Accuracy Star, which corresponds to the measurement from the survey nail to the bottom of the edge of the tube. Refer to the image in the Accuracy Star Measurement Utility to ensure the measurement is taken at the right position.
2. Open the Accuracy Star Measurement Utility from the Control Points tab.
3. Enter the slant height measurements in the Utility and select the measurement unit.
4. The H Offset will automatically be calculated.
5. Copy the calculated H Offset value into your Control Points ASCII file before importing Control Points using the wizard or right-click in the applicable HOffset cell in Feature Analyst for your Control Points Feature File and paste to add the value.

Figure 2: Accuracy Star Measurement Utility dialog