
Some of the highlights of the new ASPRS Horizontal Accuracy Standards for Geospatial Data are the following:
- Unlimited horizontal accuracy classes:
The new standard was designed to fit any horizontal accuracy requirement no matter what technology, current or future, is used. Table 3 represents the new ASPRS horizontal accuracy classes.Table 3 The new ASPRS horizontal accuracy classes Horizontal Accuracy Class Absolute Accuracy
RMSEH (cm)
Orthoimagery Mosaic Seamline Mismatch (cm) #-cm R M S E H = R M S E x 2 + R M S E y 2 RMS E H = R a d i a l R M S E = C i r c u l a r R MS E = T w o − d i m e n s i o n a l R M S E o f X & Y - Aerial triangulation results should be twice as accurate as the generated products:
- Ortho and planimetric maps ONLY:
R M S E H ( A T ) = ½ * R M S E H ( M a p ) and R M S EV ( A T ) = R M S E H ( M a p ) - For ortho, planimetric maps, and elevation maps: R M S E H ( A T ) = ½ * R M S E H ( M a p ) and R M S EV ( A T ) = R M S E H (DEM )
- Ortho and planimetric maps ONLY:
- Control points for aerial triangulation should be twice as accurate as aerial triangulation:
- For ortho and planimetric maps ONLY: R M S E H ( GCP ) = ½ * R M S E H ( M a p ) and R M S EV ( GCP ) = R M S E H ( M a p )
- For ortho/planimetric maps and elevation maps: R M S E H ( GCP ) = ½ * R M S E H ( M a p) and R M S EV (GCP ) = ½ * R M S E V (DEM )
- For ortho and planimetric maps ONLY: R M S E H ( GCP ) = ½ * R M S E H ( M a p ) and R M S EV ( GCP ) = R M S E H ( M a p )
Table 4 lists common horizontal accuracy classes for geospatial mapping products.
Horizontal Accuracy Class RMSEx and RMSEy (cm) | RMSEr (cm) | Orthoimage Mosaic Seamline Maximum Mismatch (cm) |
---|---|---|
0.63 | 0.9 | 1.3 |
1.25 | 1.8 | 2.5 |
2.50 | 3.5 | 5.0 |
5.00 | 7.1 | 10.0 |
7.50 | 10.6 | 15.0 |
10.00 | 14.1 | 20.0 |
12.50 | 17.7 | 25.0 |
15.00 | 21.2 | 30.0 |
17.50 | 24.7 | 35.0 |
20.00 | 28.3 | 40.0 |
22.50 | 31.8 | 45.0 |
25.00 | 35.4 | 50.0 |
27.50 | 38.9 | 55.0 |
30.00 | 42.4 | 60.0 |
45.00 | 63.6 | 90.0 |
60.00 | 84.9 | 120.0 |
75.00 | 106.1 | 150.0 |
100.00 | 141.4 | 200.0 |
150.00 | 212.1 | 300.0 |
200.00 | 282.8 | 400.00 |
250.00 | 353.6 | 500.0 |
300.00 | 424.3 | 600.0 |
500.00 | 707.1 | 1000.0 |
1000.00 | 1414.2 | 2000.0 |