The new ASPRs Standards and number of check points

The new ASPRs Standards and number of check points

The new standards provide Table 8 for the recommended number of check points required for validating product accuracies. For project areas that are larger than 2,500 square kilometers, refer to the text of the standards for guidance.

Table 8 Recommended number of check points required for validating product accuracies according to ASPRS Standards

Click for a text description of Table 8.

Horizontal Accuracy Testing of Orthoimagery and Planimetrics

Project Area (Square Kilometers)	Total Number of Static 2D/3D Checkpoints (clearly-defined points)
$\le$500	20
501-750	25
751-1000	30
1001-1250	35
1251-1500	40
1501-1750	45
1751-2000	50
2001-2250	55
2251-2500	60

Vertical and Horizontal Accuracy Testing of Elevation Data sets

Project Area (Square Kilometers)	Number of Static 3D Checkpoints in NVA3	Number of Static 3D Checkpoints in VVA	Total Number of Static 3D Checkpoints
$\le$500	20	5	25
501-750	20	10	30
751-1000	25	15	40
1001-1250	30	20	50
1251-1500	35	25	60
1501-1750	40	30	70
1751-2000	45	35	80
2001-2250	50	40	90
2251-2500	55	45	100

Find more information about the new ASPRS standards here.

Download a copy of the standards here.