[OSGeo-Brasil] calculo com aparencia nula
Rodrigo Koblitz
rodrigokoblitz em yahoo.com.br
Segunda Junho 20 22:11:32 EDT 2011
Olás,
prosseguindo na tentativa de encontrar biomassa através de indices de vegetação (parece que pela banda L de um radar tb. funciona) me deparei com um problema no qgis.
Quando faço uma operação para conseguir a radiancia me deparo com uma imagem completamente cinza, na mesma tonalidade, mas com valores diferentes.
parece que deu certo o calculo, mas não me mostra isso.
O calculo é com a banda 1 de um landsat, já com a correção do pixel escuro.
Os valores variam de 1 a 221. Tem um valor 0 com muitos pixels que não o retirei...será que o erro é esse?
Bom , em sintese:
vlr do pixel * ((221-1)/255) +1
É possível ver a imagem?
Envio o histograma abaixo caso seja relevante.
Forte abraço,
Koblitz
0 16943384 16943384 31.4993 31.4993
1 867 16944251 0.0016 31.5009
2 2516 16946767 0.0047 31.5056
3 3617 16950384 0.0067 31.5123
4 6052 16956436 0.0113 31.5236
5 10187 16966623 0.0189 31.5425
6 17974 16984597 0.0334 31.5759
7 26828 17011425 0.0499 31.6258
8 49319 17060744 0.0917 31.7175
9 185391 17246135 0.3447 32.0621
10 943339 18189474 1.7538 33.8159
11 2756489 20945963 5.1246 38.9404
12 4138228 25084191 7.6933 46.6338
13 4842614 29926805 9.0029 55.6366
14 5253628 35180433 9.7670 65.4036
15 4115192 39295625 7.6505 73.0541
16 2828501 42124126 5.2584 78.3126
17 1869706 43993832 3.4760 81.7885
18 1427264 45421096 2.6534 84.4419
19 1131704 46552800 2.1039 86.5459
20 800871 47353671 1.4889 88.0348
21 671877 48025548 1.2491 89.2839
22 706948 48732496 1.3143 90.5981
23 696767 49429263 1.2954 91.8935
24 588517 50017780 1.0941 92.9876
25 453169 50470949 0.8425 93.8301
26 392648 50863597 0.7300 94.5600
27 415933 51279530 0.7733 95.3333
28 419207 51698737 0.7793 96.1126
29 329698 52028435 0.6129 96.7256
30 243975 52272410 0.4536 97.1792
31 211479 52483889 0.3932 97.5723
32 161706 52645595 0.3006 97.8729
33 115203 52760798 0.2142 98.0871
34 97761 52858559 0.1817 98.2689
35 87669 52946228 0.1630 98.4318
36 77975 53024203 0.1450 98.5768
37 65325 53089528 0.1214 98.6982
38 54669 53144197 0.1016 98.7999
39 52033 53196230 0.0967 98.8966
40 48282 53244512 0.0898 98.9864
41 40643 53285155 0.0756 99.0619
42 33829 53318984 0.0629 99.1248
43 31915 53350899 0.0593 99.1842
44 32058 53382957 0.0596 99.2438
45 31779 53414736 0.0591 99.3028
46 27627 53442363 0.0514 99.3542
47 24627 53466990 0.0458 99.4000
48 23795 53490785 0.0442 99.4442
49 21755 53512540 0.0404 99.4847
50 18832 53531372 0.0350 99.5197
51 15945 53547317 0.0296 99.5493
52 15585 53562902 0.0290 99.5783
53 15589 53578491 0.0290 99.6073
54 14899 53593390 0.0277 99.6350
55 12768 53606158 0.0237 99.6587
56 12561 53618719 0.0234 99.6821
57 12081 53630800 0.0225 99.7045
58 11053 53641853 0.0205 99.7251
59 9717 53651570 0.0181 99.7431
60 8650 53660220 0.0161 99.7592
61 8732 53668952 0.0162 99.7755
62 8811 53677763 0.0164 99.7918
63 8218 53685981 0.0153 99.8071
64 7321 53693302 0.0136 99.8207
65 6481 53699783 0.0120 99.8328
66 5977 53705760 0.0111 99.8439
67 5106 53710866 0.0095 99.8534
68 4497 53715363 0.0084 99.8617
69 4148 53719511 0.0077 99.8694
70 4019 53723530 0.0075 99.8769
71 3614 53727144 0.0067 99.8836
72 3399 53730543 0.0063 99.8900
73 3170 53733713 0.0059 99.8958
74 3083 53736796 0.0057 99.9016
75 2863 53739659 0.0053 99.9069
76 2512 53742171 0.0047 99.9116
77 2223 53744394 0.0041 99.9157
78 2121 53746515 0.0039 99.9196
79 2190 53748705 0.0041 99.9237
80 2070 53750775 0.0038 99.9276
81 1909 53752684 0.0035 99.9311
82 1713 53754397 0.0032 99.9343
83 1670 53756067 0.0031 99.9374
84 1595 53757662 0.0030 99.9404
85 1412 53759074 0.0026 99.9430
86 1337 53760411 0.0025 99.9455
87 1308 53761719 0.0024 99.9479
88 1307 53763026 0.0024 99.9503
89 1232 53764258 0.0023 99.9526
90 1127 53765385 0.0021 99.9547
91 1223 53766608 0.0023 99.9570
92 1181 53767789 0.0022 99.9592
93 1123 53768912 0.0021 99.9613
94 1080 53769992 0.0020 99.9633
95 965 53770957 0.0018 99.9651
96 961 53771918 0.0018 99.9669
97 1016 53772934 0.0019 99.9688
98 967 53773901 0.0018 99.9706
99 854 53774755 0.0016 99.9721
100 785 53775540 0.0015 99.9736
101 778 53776318 0.0014 99.9751
102 707 53777025 0.0013 99.9764
103 634 53777659 0.0012 99.9775
104 613 53778272 0.0011 99.9787
105 622 53778894 0.0012 99.9798
106 609 53779503 0.0011 99.9810
107 565 53780068 0.0011 99.9820
108 566 53780634 0.0011 99.9831
109 533 53781167 0.0010 99.9841
110 429 53781596 0.0008 99.9849
111 408 53782004 0.0008 99.9856
112 399 53782403 0.0007 99.9864
113 328 53782731 0.0006 99.9870
114 335 53783066 0.0006 99.9876
115 275 53783341 0.0005 99.9881
116 243 53783584 0.0005 99.9886
117 231 53783815 0.0004 99.9890
118 206 53784021 0.0004 99.9894
119 200 53784221 0.0004 99.9897
120 161 53784382 0.0003 99.9900
121 179 53784561 0.0003 99.9904
122 157 53784718 0.0003 99.9907
123 165 53784883 0.0003 99.9910
124 164 53785047 0.0003 99.9913
125 164 53785211 0.0003 99.9916
126 158 53785369 0.0003 99.9919
127 148 53785517 0.0003 99.9922
128 160 53785677 0.0003 99.9925
129 146 53785823 0.0003 99.9927
130 132 53785955 0.0002 99.9930
131 156 53786111 0.0003 99.9933
132 138 53786249 0.0003 99.9935
133 127 53786376 0.0002 99.9938
134 127 53786503 0.0002 99.9940
135 127 53786630 0.0002 99.9942
136 107 53786737 0.0002 99.9944
137 82 53786819 0.0002 99.9946
138 98 53786917 0.0002 99.9948
139 94 53787011 0.0002 99.9949
140 94 53787105 0.0002 99.9951
141 107 53787212 0.0002 99.9953
142 106 53787318 0.0002 99.9955
143 86 53787404 0.0002 99.9957
144 100 53787504 0.0002 99.9959
145 96 53787600 0.0002 99.9960
146 89 53787689 0.0002 99.9962
147 98 53787787 0.0002 99.9964
148 76 53787863 0.0001 99.9965
149 87 53787950 0.0002 99.9967
150 76 53788026 0.0001 99.9968
151 69 53788095 0.0001 99.9969
152 71 53788166 0.0001 99.9971
153 44 53788210 0.0001 99.9972
154 58 53788268 0.0001 99.9973
155 70 53788338 0.0001 99.9974
156 64 53788402 0.0001 99.9975
157 54 53788456 0.0001 99.9976
158 40 53788496 0.0001 99.9977
159 31 53788527 0.0001 99.9978
160 29 53788556 0.0001 99.9978
161 26 53788582 0.0000 99.9979
162 40 53788622 0.0001 99.9979
163 36 53788658 0.0001 99.9980
164 33 53788691 0.0001 99.9981
165 37 53788728 0.0001 99.9981
166 32 53788760 0.0001 99.9982
167 32 53788792 0.0001 99.9982
168 30 53788822 0.0001 99.9983
169 28 53788850 0.0001 99.9984
170 34 53788884 0.0001 99.9984
171 25 53788909 0.0000 99.9985
172 24 53788933 0.0000 99.9985
173 27 53788960 0.0001 99.9986
174 25 53788985 0.0000 99.9986
175 29 53789014 0.0001 99.9987
176 20 53789034 0.0000 99.9987
177 22 53789056 0.0000 99.9987
178 23 53789079 0.0000 99.9988
179 26 53789105 0.0000 99.9988
180 31 53789136 0.0001 99.9989
181 18 53789154 0.0000 99.9989
182 25 53789179 0.0000 99.9990
183 29 53789208 0.0001 99.9990
184 20 53789228 0.0000 99.9991
185 23 53789251 0.0000 99.9991
186 23 53789274 0.0000 99.9991
187 18 53789292 0.0000 99.9992
188 24 53789316 0.0000 99.9992
189 23 53789339 0.0000 99.9993
190 15 53789354 0.0000 99.9993
191 16 53789370 0.0000 99.9993
192 21 53789391 0.0000 99.9994
193 20 53789411 0.0000 99.9994
194 18 53789429 0.0000 99.9994
195 21 53789450 0.0000 99.9995
196 21 53789471 0.0000 99.9995
197 22 53789493 0.0000 99.9995
198 14 53789507 0.0000 99.9996
199 20 53789527 0.0000 99.9996
200 18 53789545 0.0000 99.9996
201 19 53789564 0.0000 99.9997
202 13 53789577 0.0000 99.9997
203 10 53789587 0.0000 99.9997
204 11 53789598 0.0000 99.9997
205 5 53789603 0.0000 99.9998
206 15 53789618 0.0000 99.9998
207 4 53789622 0.0000 99.9998
208 11 53789633 0.0000 99.9998
209 7 53789640 0.0000 99.9998
210 6 53789646 0.0000 99.9998
211 6 53789652 0.0000 99.9998
212 6 53789658 0.0000 99.9999
213 8 53789666 0.0000 99.9999
214 3 53789669 0.0000 99.9999
215 4 53789673 0.0000 99.9999
216 13 53789686 0.0000 99.9999
217 4 53789690 0.0000 99.9999
218 6 53789696 0.0000 99.9999
219 6 53789702 0.0000 99.9999
220 8 53789710 0.0000 100.0000
221 26 53789736 0.0000 100.0000
-------------- Próxima Parte ----------
Um anexo em HTML foi limpo...
URL: http://lists.osgeo.org/pipermail/brasil/attachments/20110620/4f0496fe/attachment-0001.html
Mais detalhes sobre a lista de discussão Brasil