HICO
Hyperspectral Imager for the Coastal Ocean aboard the ISS

images courtesy of Oregon State University
 
28 narrow wavebands
BAND    1      2    3     4    5     6     7    8     9    10   11  12   13   14   15   16   17  18   19   20   21   22  23   24   25   26   27    28   
WL        407 418 430 441 453 464 476 487 499 510 521 533 544 556 567 579 590 602 613 625 636 647 659 670 682 693 PAN  842




 

 
 
 
Image preparation
  Optical calibration
home

 

HICO image preparation
  • I exported from OSU's ENVI format into PCIDSK format, using OpenEV
  • The image is in Level 1B, pixel size is 100 m, 500 columns, 2000 lines
  • I did not use the projection information provided
  • HICO is comprised of 87 raw bands, ~ 5 nm wide
  • presently, I can only manage 28 bands, in spite of my full HD screen display: see command line
  • So, I binned HICO raw bands as follows
WLMin[ 1]=401.2 WL[ 1]=406.9 WLMax[ 1]=412.7    by binning bands HICO_1 and HICO_2
WLMin[ 2]=412.7 WL[ 2]=418.4 WLMax[ 2]=424.1    by binning bands HICO_3 and HICO_4
WLMin[ 3]=424.1 WL[ 3]=429.9 WLMax[ 3]=435.6    ....
WLMin[ 4]=435.6 WL[ 4]=441.3 WLMax[ 4]=447.0    ....
WLMin[ 5]=447.1 WL[ 5]=452.8 WLMax[ 5]=458.5    ....
WLMin[ 6]=458.5 WL[ 6]=464.2 WLMax[ 6]=469.9    ....
WLMin[ 7]=470.0 WL[ 7]=475.7 WLMax[ 7]=481.4    ....
WLMin[ 8]=481.4 WL[ 8]=487.1 WLMax[ 8]=492.9    ....
WLMin[ 9]=492.9 WL[ 9]=498.6 WLMax[ 9]=504.3    ....
WLMin[10]=504.3 WL[10]=510.0 WLMax[10]=515.8    ....

WLMin[11]=515.8 WL[11]=521.5 WLMax[11]=527.2    ....
WLMin[12]=527.2 WL[12]=533.0 WLMax[12]=538.7    ....
WLMin[13]=538.7 WL[13]=544.4 WLMax[13]=550.1    ....
WLMin[14]=550.2 WL[14]=555.9 WLMax[14]=561.6    ....
WLMin[15]=561.6 WL[15]=567.3 WLMax[15]=573.0    ....
WLMin[16]=573.1 WL[16]=578.8 WLMax[16]=584.5    ....
WLMin[17]=584.5 WL[17]=590.2 WLMax[17]=596.0    ....
WLMin[18]=596.0 WL[18]=601.7 WLMax[18]=607.4    ....
WLMin[19]=607.4 WL[19]=613.2 WLMax[19]=618.9    ....
WLMin[20]=618.9 WL[20]=624.6 WLMax[20]=630.3    ....

WLMin[21]=630.4 WL[21]=636.1 WLMax[21]=641.8    ....
WLMin[22]=641.8 WL[22]=647.5 WLMax[22]=653.2    ....
WLMin[23]=653.3 WL[23]=659.0 WLMax[23]=664.7    ....
WLMin[24]=664.7 WL[24]=670.4 WLMax[24]=676.1    ....
WLMin[25]=676.2 WL[25]=681.9 WLMax[25]=687.6    ....

WLMin[26]=687.6 WL[26]=693.3 WLMax[26]=699.1   by binning bands HICO_51 and HICO_52
WLMin[27]=699.1 WL[27]=704.8 WLMax[27]=710.5   this is a synthetic Panchromatic band
WLMin[28]=836.6 WL[28]=842.3 WLMax[28]=848.0   by binning bands HICO_77 and HICO_78

The 4SM synthetic panchromatic band was prepared
by binning bands 4SM-7 to 4SM-25
WLMin[ 7]=470.0 WL[ 7]=475.7 WLMax[ 7]=481.4    ....
WLMin[ 8]=481.4 WL[ 8]=487.1 WLMax[ 8]=492.9    ....
WLMin[ 9]=492.9 WL[ 9]=498.6 WLMax[ 9]=504.3    ....
WLMin[10]=504.3 WL[10]=510.0 WLMax[10]=515.8    ....
WLMin[11]=515.8 WL[11]=521.5 WLMax[11]=527.2    ....
WLMin[12]=527.2 WL[12]=533.0 WLMax[12]=538.7    ....
WLMin[13]=538.7 WL[13]=544.4 WLMax[13]=550.1    ....
WLMin[14]=550.2 WL[14]=555.9 WLMax[14]=561.6    ....
WLMin[15]=561.6 WL[15]=567.3 WLMax[15]=573.0    ....
WLMin[16]=573.1 WL[16]=578.8 WLMax[16]=584.5    ....
WLMin[17]=584.5 WL[17]=590.2 WLMax[17]=596.0    ....
WLMin[18]=596.0 WL[18]=601.7 WLMax[18]=607.4    ....
WLMin[19]=607.4 WL[19]=613.2 WLMax[19]=618.9    ....
WLMin[20]=618.9 WL[20]=624.6 WLMax[20]=630.3    ....
WLMin[21]=630.4 WL[21]=636.1 WLMax[21]=641.8    ....
WLMin[22]=641.8 WL[22]=647.5 WLMax[22]=653.2    ....
WLMin[23]=653.3 WL[23]=659.0 WLMax[23]=664.7    ....
WLMin[24]=664.7 WL[24]=670.4 WLMax[24]=676.1    ....
WLMin[25]=676.2 WL[25]=681.9 WLMax[25]=687.6    ....
So, for 4SM, my database.pix 16U image database has 28 raw data bands, ~10 nm wide
  • Blue        is band_7
  • Green     is band_13
  • Red         is band_22
  • Panchro is band_27
  • NIR         is band_28
HICO images are not georeferenced.
 

Optical calibration

This by large benefitted from investigations conducted on HYPERION at Fakarava atoll
 



HICO at Lee Stocking Island
November image    
Results June versus November
June November

june
no tide correction
ARTIFACT: note the shoaling artifact
over the very dark seagrass area

november
no tide correction
Note the absence of a shoaling artifact
over the very dark seagrass area

 
 

june
no tide correction

november
no tide correction

 

 

 

 

 
These two LSI HICO scenes are not co-registered; so results may not be precisely compared.
As regards vegetation: one scene is taken in end spring, one in late autumn.
It takes very strict fine-tuning to obtain "reasonable" results.
I'm not allways sure what aspect of the "physics behind" such fiddling actually portends.

All this practise must be reviewed and investigated by competent accademic research.
But 4SM possibly is a viable alternative
to more complex semi-analytical approaches.

 

















 











 



Créer un site
Créer un site