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Using MODIS Data after FLAASH

Reading MODIS L1B into ENVI“Back calculating” to quantify the “atmospheric effect” of water vapor or other gases in a “corrected” hyperspectral image using QUAC?problems of display modis ndvi with TIMESATDoes MOD021km images from MODIS needs atmospheric corrections16-day-MODIS NDVI values seem to be wrong compared to my soil moisture ground data!Issues with using FLAASH on GeoEye dataAtmospheric correction with FLAASHAtmospheric correction using FLAASHPlanet filter file for ENVI atmospheric correctionCalculating temperature of given area using MODIS LST data?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

1

I need to convert modis MOD021km data to reflectance and Brightness temperature.

I know that some plugins for Envi is doing this with modis data but I want to run an atmospheric correction on my data first and for this purpose I am using FLAASH in Envi,

It works fine but The results that I get are a bit strange.For example here is a DN of a pixel

before Run flash:129.676651
afrer FLAASH:3144
The Reflactance that is calculated using MCTK plugin(without FLAASH):0.261504

If I want to convert the result of FLASH to reflectance and brightness temperature what algorithms should I use?

I know the algorithms for converting DN's to BT and .. but I think the result of FLASH should not used directly in those algorithms ..

Do you know how to use FLAASH results in case of calculating reflectance and brightness temperature?

modis envi flaash

share|improve this question

edited Sep 28 '17 at 23:10

PolyGeo♦

53.9k1781245

asked Nov 18 '14 at 18:25

Majid HojatiMajid Hojati

373414

add a comment | 

1

I need to convert modis MOD021km data to reflectance and Brightness temperature.

I know that some plugins for Envi is doing this with modis data but I want to run an atmospheric correction on my data first and for this purpose I am using FLAASH in Envi,

It works fine but The results that I get are a bit strange.For example here is a DN of a pixel

before Run flash:129.676651
afrer FLAASH:3144
The Reflactance that is calculated using MCTK plugin(without FLAASH):0.261504

If I want to convert the result of FLASH to reflectance and brightness temperature what algorithms should I use?

I know the algorithms for converting DN's to BT and .. but I think the result of FLASH should not used directly in those algorithms ..

Do you know how to use FLAASH results in case of calculating reflectance and brightness temperature?

modis envi flaash

share|improve this question

edited Sep 28 '17 at 23:10

PolyGeo♦

53.9k1781245

asked Nov 18 '14 at 18:25

Majid HojatiMajid Hojati

373414

add a comment | 

I need to convert modis MOD021km data to reflectance and Brightness temperature.

I know that some plugins for Envi is doing this with modis data but I want to run an atmospheric correction on my data first and for this purpose I am using FLAASH in Envi,

It works fine but The results that I get are a bit strange.For example here is a DN of a pixel

before Run flash:129.676651
afrer FLAASH:3144
The Reflactance that is calculated using MCTK plugin(without FLAASH):0.261504

If I want to convert the result of FLASH to reflectance and brightness temperature what algorithms should I use?

I know the algorithms for converting DN's to BT and .. but I think the result of FLASH should not used directly in those algorithms ..

Do you know how to use FLAASH results in case of calculating reflectance and brightness temperature?

modis envi flaash

share|improve this question

edited Sep 28 '17 at 23:10

PolyGeo♦

53.9k1781245

asked Nov 18 '14 at 18:25

Majid HojatiMajid Hojati

373414

before Run flash:129.676651
afrer FLAASH:3144
The Reflactance that is calculated using MCTK plugin(without FLAASH):0.261504

share|improve this question

edited Sep 28 '17 at 23:10

PolyGeo♦

53.9k1781245

asked Nov 18 '14 at 18:25

Majid HojatiMajid Hojati

373414

share|improve this question

edited Sep 28 '17 at 23:10

PolyGeo♦

53.9k1781245

asked Nov 18 '14 at 18:25

Majid HojatiMajid Hojati

373414

edited Sep 28 '17 at 23:10

PolyGeo♦

53.9k1781245

edited Sep 28 '17 at 23:10

PolyGeo♦

53.9k1781245

asked Nov 18 '14 at 18:25

Majid HojatiMajid Hojati

373414

asked Nov 18 '14 at 18:25

Majid HojatiMajid Hojati

373414

2 Answers
2

active

oldest

votes

2

the first task you should do after run FLAASH atmospheric correction in ENVI, is that you check the Minimum and Maximum of reflectance image(by use statistics calculation).
if your results is not normal and there are negative values, use bellow formula in Band math:
(b1 le 0)*0+(b1 ge 10000)*1+(b1 gt 0 and b1 lt 10000)*float(b1)/10000
b1 is a channel.
and you should use this for all of the channel in reflectance image.

share|improve this answer

answered Nov 30 '14 at 3:26

hosseinhossein

361

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help..Can you say why the results of flash are integers and arounf 3000 ?it this normal?
  
  – Majid Hojati
  Nov 30 '14 at 15:55
  

  
  
  
  

add a comment | 

1

I am not familiar with the tools you mention, but the procedures behind conversion to radiance or brightness temperature are pretty straightforward. These are linear transformations of the pixel values. If you feel comfortable scripting, you should be able to do it with minimum hassle. In this site you will find a useful tutorial for working with MODIS with open source tools. Perhaps it gives you hints on solving your problem.

share|improve this answer

edited Sep 28 '17 at 23:11

PolyGeo♦

53.9k1781245

answered Nov 18 '14 at 19:23

user21313

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help..I know Matlap scripting but I think the result of DN's that retrieve after atmospheric correction is not true.for example the original DN of a pixel was 129.676651 and after atmospheric correction it turned to 3144,Do you think it is normal?I have found Brightness temp algorithm but can not find reflectance .Do you have its algorithm for Modis data?
  
  – Majid Hojati
  Nov 18 '14 at 19:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Difficult to say from this information. It does not seem normal. I would check the procedures, so that there are no glitches in the calculations. I do not have algorithms for atmospheric correction, unfortunately.
  
  – user21313
  Nov 18 '14 at 19:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you very much,I used FLAASH Atmospheric correction that is in ENVI ..Unfortunately I don't know its algorithms..What do you suggest me to do?
  
  – Majid Hojati
  Nov 18 '14 at 20:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not sure. You might want to check this page grasswiki.osgeo.org/wiki/Atmospheric_correction
  
  – user21313
  Nov 19 '14 at 8:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks very muchbut it is for landsat data..I use MODIS :(
  
  – Majid Hojati
  Nov 19 '14 at 11:47
  

  
  
  
  

 | 
show 1 more comment

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2

the first task you should do after run FLAASH atmospheric correction in ENVI, is that you check the Minimum and Maximum of reflectance image(by use statistics calculation).
if your results is not normal and there are negative values, use bellow formula in Band math:
(b1 le 0)*0+(b1 ge 10000)*1+(b1 gt 0 and b1 lt 10000)*float(b1)/10000
b1 is a channel.
and you should use this for all of the channel in reflectance image.

share|improve this answer

answered Nov 30 '14 at 3:26

hosseinhossein

361

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help..Can you say why the results of flash are integers and arounf 3000 ?it this normal?
  
  – Majid Hojati
  Nov 30 '14 at 15:55
  

  
  
  
  

add a comment | 

2

the first task you should do after run FLAASH atmospheric correction in ENVI, is that you check the Minimum and Maximum of reflectance image(by use statistics calculation).
if your results is not normal and there are negative values, use bellow formula in Band math:
(b1 le 0)*0+(b1 ge 10000)*1+(b1 gt 0 and b1 lt 10000)*float(b1)/10000
b1 is a channel.
and you should use this for all of the channel in reflectance image.

share|improve this answer

answered Nov 30 '14 at 3:26

hosseinhossein

361

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help..Can you say why the results of flash are integers and arounf 3000 ?it this normal?
  
  – Majid Hojati
  Nov 30 '14 at 15:55
  

  
  
  
  

add a comment | 

the first task you should do after run FLAASH atmospheric correction in ENVI, is that you check the Minimum and Maximum of reflectance image(by use statistics calculation).
if your results is not normal and there are negative values, use bellow formula in Band math:
(b1 le 0)*0+(b1 ge 10000)*1+(b1 gt 0 and b1 lt 10000)*float(b1)/10000
b1 is a channel.
and you should use this for all of the channel in reflectance image.

share|improve this answer

answered Nov 30 '14 at 3:26

hosseinhossein

361

share|improve this answer

answered Nov 30 '14 at 3:26

hosseinhossein

361

answered Nov 30 '14 at 3:26

hosseinhossein

361

answered Nov 30 '14 at 3:26

hosseinhossein

361

1

I am not familiar with the tools you mention, but the procedures behind conversion to radiance or brightness temperature are pretty straightforward. These are linear transformations of the pixel values. If you feel comfortable scripting, you should be able to do it with minimum hassle. In this site you will find a useful tutorial for working with MODIS with open source tools. Perhaps it gives you hints on solving your problem.

share|improve this answer

edited Sep 28 '17 at 23:11

PolyGeo♦

53.9k1781245

answered Nov 18 '14 at 19:23

user21313

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help..I know Matlap scripting but I think the result of DN's that retrieve after atmospheric correction is not true.for example the original DN of a pixel was 129.676651 and after atmospheric correction it turned to 3144,Do you think it is normal?I have found Brightness temp algorithm but can not find reflectance .Do you have its algorithm for Modis data?
  
  – Majid Hojati
  Nov 18 '14 at 19:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Difficult to say from this information. It does not seem normal. I would check the procedures, so that there are no glitches in the calculations. I do not have algorithms for atmospheric correction, unfortunately.
  
  – user21313
  Nov 18 '14 at 19:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you very much,I used FLAASH Atmospheric correction that is in ENVI ..Unfortunately I don't know its algorithms..What do you suggest me to do?
  
  – Majid Hojati
  Nov 18 '14 at 20:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not sure. You might want to check this page grasswiki.osgeo.org/wiki/Atmospheric_correction
  
  – user21313
  Nov 19 '14 at 8:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks very muchbut it is for landsat data..I use MODIS :(
  
  – Majid Hojati
  Nov 19 '14 at 11:47
  

  
  
  
  

 | 
show 1 more comment

1

I am not familiar with the tools you mention, but the procedures behind conversion to radiance or brightness temperature are pretty straightforward. These are linear transformations of the pixel values. If you feel comfortable scripting, you should be able to do it with minimum hassle. In this site you will find a useful tutorial for working with MODIS with open source tools. Perhaps it gives you hints on solving your problem.

share|improve this answer

edited Sep 28 '17 at 23:11

PolyGeo♦

53.9k1781245

answered Nov 18 '14 at 19:23

user21313

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your help..I know Matlap scripting but I think the result of DN's that retrieve after atmospheric correction is not true.for example the original DN of a pixel was 129.676651 and after atmospheric correction it turned to 3144,Do you think it is normal?I have found Brightness temp algorithm but can not find reflectance .Do you have its algorithm for Modis data?
  
  – Majid Hojati
  Nov 18 '14 at 19:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Difficult to say from this information. It does not seem normal. I would check the procedures, so that there are no glitches in the calculations. I do not have algorithms for atmospheric correction, unfortunately.
  
  – user21313
  Nov 18 '14 at 19:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you very much,I used FLAASH Atmospheric correction that is in ENVI ..Unfortunately I don't know its algorithms..What do you suggest me to do?
  
  – Majid Hojati
  Nov 18 '14 at 20:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not sure. You might want to check this page grasswiki.osgeo.org/wiki/Atmospheric_correction
  
  – user21313
  Nov 19 '14 at 8:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks very muchbut it is for landsat data..I use MODIS :(
  
  – Majid Hojati
  Nov 19 '14 at 11:47
  

  
  
  
  

 | 
show 1 more comment

I am not familiar with the tools you mention, but the procedures behind conversion to radiance or brightness temperature are pretty straightforward. These are linear transformations of the pixel values. If you feel comfortable scripting, you should be able to do it with minimum hassle. In this site you will find a useful tutorial for working with MODIS with open source tools. Perhaps it gives you hints on solving your problem.

share|improve this answer

edited Sep 28 '17 at 23:11

PolyGeo♦

53.9k1781245

answered Nov 18 '14 at 19:23

user21313

share|improve this answer

edited Sep 28 '17 at 23:11

PolyGeo♦

53.9k1781245

answered Nov 18 '14 at 19:23

user21313

edited Sep 28 '17 at 23:11

PolyGeo♦

53.9k1781245

edited Sep 28 '17 at 23:11

PolyGeo♦

53.9k1781245