リモートセンシングによる サンゴ礁モニタリング

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1 ALOS

2 NASDA LANDSAT/TM 3 4

3 1 Science, 2002 February 15, vol.295, pp Marine Biodiversity Hotspots and Conservation Priorities for Tropical Reefs,

4

5 1 3 50cm/s Buoy8 Jun. 12 9:12 Buoy3 Jun. 12 9:29 Buoy9 Jun :12 Buoy2 Jun. 12 7:55 10km N Kerama Is. Released Jun. 8 at 16:00 Buoy6 Jun. 11 8:08 Buoy1 Jun :20 Okinawa Is. 57 HF km N

6 1 4 NASDA NASDA LANDSAT/TM 3

7 2 1

8 2 1

9 2 1 Lyzenga i j DNiDNj Lyzenga BIij2 BIij = log(dni - DNdeep i) - kij log(dnj DNdeep j) = log{( DNi - DNdeep i) / log(dnj DNdeep j) kij} (1) BIij i j DNi idn DNdeep i i DN kij i j 1 i j BIij2 DN DN DN

10 2 1 BI = log{(dn i -DN deep,i ) / (DN j -DN deepj ) kij } Band i DN Band idn

11 2 1 K 12 log(dn 1* )log(dn 2* )

12 2 LANDSAT/TM 2000/10/1 1998/9/ /9/15 Landsat7 / ETM Landsat5 / TM Landsat5 / TM All Satellite Image Data were provided by NASDA

13 2 LANDSAT/TM DN 2000/10/1 1998/9/ /9/15

14 2 LANDSAT/TM k /10/1 (Correlation) 1998/9/18 (Correlation) 1995/9/15 (Correlation) (0.900) (0.968) (0.829) N/A (cloud) (0.829) (0.880) Ref.: k , k

15 2 LANDSAT/TM DN 2000/10/1 Mean = 1.582, SD = /9/18 Mean = 2.106, SD = /9/18 Mean = 1.615, SD = 0.067

16 2 2 LANDSAT/TM 2000/10/1 1998/9/ /9/15 Histogram

17 2000/10/1 1998/9/ /9/15 Coral/ Algae/ Sea grass/ etc. SAND

18 2000/10/1 1998/9/ /9/15 Coral/ Algae/ Sea grass/ etc. SAND

19 2 LANDSAT/TM 7m

20 2 3

21 First Differentiation of Simulated Reflectance 2 3 Live Coral Dead Coral Acropora hyacinthus Dead Acropora covered by algae Simulated Reflectance Acropora nobilis Dead Acropora Bleached

22 2 3 C206P 2 Field Spec FR 1 1 A 1 B 2 A B A m /3/23

23 TM LANDSAT/TM TM DN band1 band2 band3 <B> N 130m 90m N 10 <C> <D> <E> <F> % <G> % <H> %

24 2 3 LANDSAT/TM LANDSAT/TM band LANDSAT/TMDN( ) Depth[m]band1band2band3 Hea1thy coral Dead cora1 Sand band1band2band3 band1band2band m 0 m/sec % % LANDSAT/TMDN( ) Hea1thy cora1 25%, Sand 75% Hea1thy cora1 50%, Sand 50% Depth[m] band1band2band3 band1band2band [m ] 1, 3, 5, 10, 20 Healthycora1 25%, Dead cora1 75% Healthy cora1 50%, Dead cora1 50% Depth[m] band1band2band3 band1band2band3 Case 1 0.5mg/m

25 2 3 ALOS/AVNIR2 ALOS/AVNIR2 ( ) Wm -2 sr -1 m -1 Depth[m]band1band2band3 Hea1thy coral Dead cora1 Sand band1band2band3 band1band2band ALOS/AVNIR2 ( ) Wm -2 sr -1 m -1 Hea1thy cora1 25%, Sand 75% Hea1thy cora1 50%, Sand 50% Depth[m] band1band2band3 band1band2band

26 CASI

27 2 4 CASI 7m 10m ALOS/AVNIR2 LANDSAT/TM

2 3 5 5 5 5 6 6 7 7 8 10 10 10 10 11 11 12 12 13 16 16 16 16 17 19 21 21 22 5

2 3 5 5 5 5 6 6 7 7 8 10 10 10 10 11 11 12 12 13 16 16 16 16 17 19 21 21 22 5 1D000425-2 1 2 3 5 5 5 5 6 6 7 7 8 10 10 10 10 11 11 12 12 13 16 16 16 16 17 19 21 21 22 5 3 29 29 29 30 31 31 32 35 35 35 36 41 41 41 46 48 48 48 52 57 4 700 13 1988 4 5 4 5 21 1 1 3 4 5 6 21 10 1888

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