| Term: | ECEF |
| Definition: |
The Earth-Centered, Earth-Fixed (ECEF)coordinate system has point (0,0,0) defined as the center of mass of theEarth. Its axes are aligned with the International Reference Pole (IRP) andInternational Reference Meridian (IRM). The x-axis intersects the sphere ofthe Earth at 0 degree latitude (Equator) and 0 degree longitude (Greenwich).The z-axis points north. The y-axis completes the right handed coordinatesystem. |