:
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17 , . 0.3 . , . , , () NOAA-7 1981 1986 . , NIH Image 1.55, , .
NIH Image, . Open File. , Earth.
1. . , ?
Close File, . Open File SD86365I.BRW. 1986 .
. . ( ) . . Cross-Hairs Tools . , x- y- .
2. (x,y) .
3. ? ( ): ( )
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6. ?
7. ?
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1 (x,y) SD86365I.BRW . - , .
8. (x,y). 1, :
(X,Y) (104,90) _ _ (302,54) - _ _ (116,57) Perth _ _ (11,149) _ _
, , DN. DN = 0.15*DN - 2.1
9. DN , . DN = 1.8* + 32
(X,Y) DN (104,90) _ _ (302,54) - _ _ (116,57) Perth _ _ (11,149) _ _
, . Cross-Hairs LUT (Look Up Table). ( ) ( ) DN 0 254, -2.1 36 . , , , - . . , , DN 255 .
Tools Draw Line. , (0,89) , DX = 359 DY = 0.
10. ? Draw Line, (179,0) , DX = 0 DY = 179.
11. ?
Rectangle Tools. , , (155,89) (234,137). . .
Load Macros Special. Macros. , Plotting Macros. Plot Histogram Special. , , . , .
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12. DN ? . : . .
13. DN ? ? .
14. DN ? ? .
15. , .
. . , . Yes. - North Pacific Histogram, Save. .
, , . Hand Tools, , , - (155,89).
Plot Histogram Special, . , , , . , .
16. DN ?
: DN.17. DN ?
18. DN ?
19. , .
, South Pacific Histogram. Open File. North Pacific Histogram. South Pacific Histogram. , , .
20. , .
Image Math Enhance. North Pacific Histogram - South Pacific Histogram OK.
21. , .
, South Pacific Histogram - North Pacific Histogram
22. ?
23. 20 21 ?
File . SD86181I.BRW. 1986 .
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25. ? , -, ?
26. .