Calculation of Geostationary Satellites' Nominal Fixed Grid and Its Application in FY-4A Advanced Geosynchronous Radiation Imager

Fig. 6. (a) Western coastline of Australia L1 image+CGMS coastline; (b) western coastline of Australia L1 image+GOES-R coastline; (c) western coastline of Australia transformed image+GOES-R coastline

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Fig. 7. (a) Eastern coastline of Australia L1 image+CGMS coastline; (b) eastern coastline of Australia L1 image+GOES-R coastline; (c) eastern coastline of Australia transformed image+GOES-R coastline

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Fig. 8. (a) Somalia L1 image+CGMS coastline; (b) Somalia L1 image+GOES-R coastline; (c) Somalia transformed image+GOES-R coastline

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Fig. 9. (a) Western coastline of Java island L1 image+CGMS coastline; (b) western coastline of Java island L1 image+GOES-R coastline; (c) western coastline of Java island transformed image+GOES-R coastline

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Fig. 10. (a) Sakhalin island L1 image+CGMS coastline; (b) Sakhalin island L1 image+GOES-R coastline; (c) Sakhalin island transformed image+GOES-R coastline

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Fig. 11. Distribution of calculated coastlines on the full disk

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Fig. 12. (a) Differences of east-west angles between FY-4A and GOES-R; (b) differences of north-south angles between FY-4A and GOES-R

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Fig. 13. (a) Differences of east-west angles between FY-4A and CGMS; (b) differences of north-south angles between FY-4A and CGMS

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Table 1. Scanning and stepping angles of normal fixed grid
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Table 1. Scanning and stepping angles of normal fixed grid
Definition Calculation formula Positive direction
CGMS β= $\begin{matrix} \frac{λ_{S}}{2} \end{matrix}$ = $\begin{matrix} \frac{1}{2} \end{matrix}$ arctan $\begin{matrix} (\frac{S_{y}}{S_{x}}) \end{matrix}$ α= $\begin{matrix} \frac{ϕ_{S}}{2} \end{matrix}$ = $\begin{matrix} \frac{1}{2} \end{matrix}$ arcsin $\begin{matrix} (\frac{S_{z}}{\sqrt[]{S_{x}^{2} + S_{y}^{2} + S_{z}^{2}}}) \end{matrix}$ Northwest
GOES-R β= $\begin{matrix} \frac{x}{2} \end{matrix}$ = $\begin{matrix} \frac{1}{2} \end{matrix}$ arcsin $\begin{matrix} (\frac{- S_{y}}{\sqrt[]{{S^{2}}_{x} + {S^{2}}_{y} + {S^{2}}_{z}}}) \end{matrix}$ α= $\begin{matrix} \frac{y}{2} \end{matrix}$ = $\begin{matrix} \frac{1}{2} \end{matrix}$ arctan $\begin{matrix} (\frac{S_{z}}{S_{x}}) \end{matrix}$ Northeast

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Jing Wang, Chengbao Liu, Lei Yang, Jian Shang, Zhiqing Zhang. Calculation of Geostationary Satellites' Nominal Fixed Grid and Its Application in FY-4A Advanced Geosynchronous Radiation Imager[J]. Acta Optica Sinica, 2018, 38(12): 1211001

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