[GRASS-user] low radiance values after i.atcor and i.topo.corr

maning sambale emmanuel.sambale at gmail.com
Thu Jun 26 05:07:08 EDT 2008 

Hi,

I've just updated to grass64 and i.cluster seems to work on FP rasters:
GRASS 6.3.1svn (p112r056):~ > r.info -r tcor.lsat7_2000.toar.1
min=0.039443
max=0.442334
[Raster MASK present]
GRASS 6.3.1svn (p112r056):~ > r.info -r tcor.lsat7_2000.toar.2
min=0.021795
max=0.572899
[Raster MASK present]
GRASS 6.3.1svn (p112r056):~ > r.info -r tcor.lsat7_2000.toar.3
min=-0.012797
max=0.649817
[Raster MASK present]
GRASS 6.3.1svn (p112r056):~ > r.info -r tcor.lsat7_2000.toar.4
min=-0.019646
max=1.026969
[Raster MASK present]
GRASS 6.3.1svn (p112r056):~ > r.info -r tcor.lsat7_2000.toar.5
min=-0.030773
max=0.799299
[Raster MASK present]


Here's the result of the sigfile report:
Cluster parameters
 Number of initial classes:    30
 Minimum class size:           17
 Minimum class separation:     0.000000
 Percent convergence:          98.000000
 Maximum number of iterations: 30

 Row sampling interval:        62
 Col sampling interval:        66

Sample size: 3005 points


means and standard deviations for 4 bands

 means   0.0987976 0.0624848 0.270133 0.150258
 stddev  0.030849 0.036726 0.0730868 0.0528295


initial means for each band

class 1    0.0679486 0.0257588 0.197046 0.097428
class 2    0.0700761 0.0282916 0.202087 0.101071
class 3    0.0722036 0.0308244 0.207127 0.104715
class 4    0.0743311 0.0333573 0.212168 0.108358
class 5    0.0764586 0.0358901 0.217208 0.112002
class 6    0.0785862 0.0384229 0.222249 0.115645
class 7    0.0807137 0.0409557 0.227289 0.119289
class 8    0.0828412 0.0434886 0.23233 0.122932
class 9    0.0849687 0.0460214 0.23737 0.126575
class 10   0.0870962 0.0485542 0.242411 0.130219
class 11   0.0892238 0.051087 0.247451 0.133862

Previously from grass63 I get this:
Cluster parameters
 Number of initial classes:    30
 Minimum class size:           17
 Minimum class separation:     0.000000
 Percent convergence:          98.000000
 Maximum number of iterations: 30

 Row sampling interval:        62
 Col sampling interval:        66

Sample size: 3005 points


means and standard deviations for 4 bands

 means     0.00   0.00   0.00   0.00
 stddev    0.00   0.00   0.06   0.03


initial means for each band

class 1      0.00   0.00  -0.05  -0.03
class 2      0.00   0.00  -0.05  -0.03
class 3      0.00   0.00  -0.05  -0.03
class 4      0.00   0.00  -0.04  -0.02
class 5      0.00   0.00  -0.04  -0.02
class 6      0.00   0.00  -0.03  -0.02
class 7      0.00   0.00  -0.03  -0.02
class 8      0.00   0.00  -0.03  -0.02
class 9      0.00   0.00  -0.02  -0.01
class 10     0.00   0.00  -0.02  -0.01
class 11     0.00   0.00  -0.01  -0.01

Thanks!

maning
On 6/23/08, maning sambale <emmanuel.sambale at gmail.com> wrote:
> Nikos,
>
> thank you fo testing seems it's working OK now.  I will test it myself
> later.
>
> maning
> On 6/20/08, Nikos Alexandris <nikos.alexandris at felis.uni-freiburg.de> wrote:
>> Not sure if this helps... (!)
>> ---
>>
>>> r.univar change_pca_250m_06.239_07.242.2_test
>>  100%
>> total null and non-null cells: 247720
>> total null cells: 162432
>>
>> Of the non-null cells:
>> ----------------------
>> n: 85288
>> minimum: -0.315021
>> maximum: 0.260252
>> range: 0.575273
>> mean: -0.000584902
>> mean of absolute values: 0.0129577
>> standard deviation: 0.0191773
>> variance: 0.00036777
>> variation coefficient: -3278.73 %
>> sum: -49.8850918202
>>
>>> r.univar change_pca_250m_06.239_07.242.1_test
>>  100%
>> total null and non-null cells: 247720
>> total null cells: 162432
>>
>> Of the non-null cells:
>> ----------------------
>> n: 85288
>> minimum: -0.513804
>> maximum: 0.394813
>> range: 0.908617
>> mean: 0.0211992
>> mean of absolute values: 0.032389
>> standard deviation: 0.042701
>> variance: 0.00182337
>> variation coefficient: 201.428 %
>> sum: 1808.0350767233
>>
>>>cat sig_cluster_test
>> #produced by i.cluster
>> #Class 1
>> 23
>> 0.014645 -0.107214
>> 0.000473
>> 0.000026 0.000349
>> #Class 2
>> 37
>> -0.014961 -0.076135
>> 0.000157
>> 0.000027 0.000139
>> #Class 3
>> 52
>> 0.002926 -0.056125
>> 0.000124
>> -0.000012 0.000061
>> #Class 4
>> 35
>> -0.028285 -0.040243
>> 0.000049
>> 0.000003 0.000105
>> #Class 5
>> 73
>> -0.004751 -0.035473
>> 0.000021
>> -0.000002 0.000035
>>
>> [...]
>>
>>
>
>
> --
> |---------|----------------------------------------------------------|
> | __.-._  |"Ohhh. Great warrior. Wars not make one great." -Yoda     |
> | '-._"7' |"Freedom is still the most radical idea of all" -N.Branden|
> |  /'.-c  |Linux registered user #402901, http://counter.li.org/     |
> |  |  /T  |http://esambale.wikispaces.com|
> | _)_/LI
> |---------|----------------------------------------------------------|
>


-- 
|---------|----------------------------------------------------------|
| __.-._  |"Ohhh. Great warrior. Wars not make one great." -Yoda     |
| '-._"7' |"Freedom is still the most radical idea of all" -N.Branden|
|  /'.-c  |Linux registered user #402901, http://counter.li.org/     |
|  |  /T  |http://esambale.wikispaces.com|
| _)_/LI
|---------|----------------------------------------------------------|

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