7.4. Geolocation Error Information 1 Daytime Observation Nighttime Observation Figure 7-3 Geolocation error for Geometric DB Version 2.0 The longitude and latitude errors can be expressed by a 6th order polynomial with a good approximation. 　　λC = λM - Δλ 　　φC =φM - Δφ where 　　λC : corrected longitude 　　λM : measured longitude 　　Δλ: longitude error 　　φC: corrected latitude 　　φM: measured latitude 　　Δφ: latitude error 　　Δλ(or Δφ) = a0 + a2φ2 + a4φ4 + a6φ6 Table 7-3 Table of Polynomial Coefficients Coefficient Descending（Daytime Observation） Ascending（Nighttime Observation） Longitude Latitude Longitude Latitude a0 -7.1636E-04 1.2344E-04 -7.0494E-03 -9.6332E-04 a2 6.0217E-07 -1.7743E-07 4.0453E-07 -1.7053E-07 a4 -4.9155E-11 6.4363E-11 -5.0296E-10 5.9668E-11 a6 3.4510E-14 -1.3692E-14 4.8045E-14 -1.2155E-14 (Unit: degree) The corrected longitude and latitude values can be obtained by subtracting the above mentioned error from the measured values. The corrected accuracy will be better than 50 m. This error will be corrected for the Level-1 products with a soon-to-be-updated geometric DB version.