Table 4.
Overall accuracy of Beijing extent extracted in different years.
| Year | Threshold | OA |
|---|---|---|
| 1992 | 33 | 97.59% |
| 1996 | 48 | 95.69% |
| 2000 | 47 | 94.63% |
| 2006 | 70 | 93.36% |
| 2010 | 50 | 90.19% |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.