Re: Returned mail: see transcript for details

[Adhithya S Rajan]

Hi, 

Firstly I would like to thank all the people behind the design of this wonderful library!

I have gone through all the tutorials on spectraldifferences.wordpress.com.

I saw that AOT values were being derived to estimate surface reflectance in the blue channel but Is it possible to derive the AOT value of each pixel from a Landsat, Sentinel image? 

Thank you for your time and effort!

Looking forward to your response.

Best regards,

Adhithya

On Fri, May 12, 2017 at 5:12 PM, Mail Delivery Subsystem <MAILER...@mx0b-00164701.pphosted.com> wrote:

The original message was received at Fri, 12 May 2017 04:42:13 -0700
from m0087756.ppops.net [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<cle...@usc.edu>
    (reason: 554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [BN3NAM01FT053.eop-nam01.prod.protection.outlook.com])

   ----- Transcript of session follows -----
... while talking to exchange-usc-edu.mail.protection.outlook.com.:
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Last-Attempt-Date: Fri, 12 May 2017 04:42:18 -0700


---------- Forwarded message ----------
From: Adhithya S Rajan <adhi...@earth2orbit.com>
To: rsgislib...@googlegroups.com, p...@aber.ac.uk, cle...@usc.edu
Cc: 
Bcc: 
Date: Fri, 12 May 2017 17:12:01 +0530
Subject: Query regd. AOT values

Hi, 

Firstly I would like to thank all the people behind the design of this wonderful library!

I have gone through all the tutorials on spectraldifferences.wordpress.com.

I saw that AOT values were being derived to estimate surface reflectance in the blue channel but Is it possible to derive the AOT value of each pixel from a Landsat, Sentinel image? 

Thank you for your time and effort!

Looking forward to your response.

Best regards,

Adhithya

--

Adhithya S Rajan

Data Scientist

Earth2Orbit Analytix (E2O)

Bangalore

+919206105250

adhi...@earth2orbit.com

--

Adhithya S Rajan

Data Scientist

Earth2Orbit Analytix (E2O)

Bangalore

+919206105250

adhi...@earth2orbit.com

[Daniel Clewley]

Hi,

Pete will be able to confirm but looking over the code I think AOT is calculated for segments rather than individual pixels and saved within a raster attribute table. You should be able to produce an image from the AOT column in the raster attribute table using RSGISLib.

Thanks,

Dan

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[Adhithya S Rajan]

Thank you Dan,

By segments do you mean a collection of pixels based on a criteria? If so, may I know how these segments are selected for the AOT calculations?

Thank you once again for the quick reply! Greatly appreciate the work you guys are doing! 

Best regards,

Adhithya

On Mon, May 22, 2017 at 6:13 PM, Daniel Clewley <daniel....@gmail.com> wrote:

Hi,

Pete will be able to confirm but looking over the code I think AOT is calculated for segments rather than individual pixels and saved within a raster attribute table. You should be able to produce an image from the AOT column in the raster attribute table using RSGISLib.

Thanks,

Dan

On 18 May 2017, at 14:24, Adhithya S Rajan <adhi...@earth2orbit.com> wrote:

Hi, 

Firstly I would like to thank all the people behind the design of this wonderful library!

I have gone through all the tutorials on spectraldifferences.wordpress.com.

I saw that AOT values were being derived to estimate surface reflectance in the blue channel but Is it possible to derive the AOT value of each pixel from a Landsat, Sentinel image? 

Thank you for your time and effort!

Looking forward to your response.

Best regards,

Adhithya

To unsubscribe from this group and stop receiving emails from it, send an email to rsgislib-support+unsubscribe@googlegroups.com.
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[Pete Bunting [pfb]]

Hi,

What Dan said is correct but the DDVAOT,DOSAOT options perform an interpolation from those dark objects for the rest of the scene. I’ve never really been happy with the result of this interpolation though so wouldn’t suggest using this for something it wasn’t intended.

Best wishes,

Pete

****************************************************
* Dr Pete Bunting
* Reader in Remote Sensing
* Earth Observation and Ecosystem Dynamics Group
* Department of Geography and Earth Sciences
* Aberystwyth University
* Aberystwyth
* Ceredigion
* SY23 3DB
* UK
*
* Ph: +44 (0) 1970 622615
* Mob: +44 (0) 7917 842743
* Email: p...@aber.ac.uk
* ORCID: http://orcid.org/0000-0002-7435-0148
****************************************************
"Please consider the environment before printing this email or any documents attached”

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www.aber.ac.uk

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[Adhithya S Rajan]

Thank you Pete,

I was trying to use this library to map PM2.5 and PM10 concentrations at 30m resolution using Landsat 8 images.

But considering what you suggested it might not be very accurate, right?

Best regards,

Adhithya

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--------------------------------------------------------------------
Un o’r 4 prifysgol uchaf yn y DU a’r orau yng Nghymru am fodlonrwydd myfyrwyr.
(Arolwg Cenedlaethol y Myfyrwyr 2016)
www.aber.ac.uk

Top 4 UK university and best in Wales for student satisfaction
(National Student Survey 2016)
www.aber.ac.uk

[Pete Bunting [pfb]]

Dear Adhithya,

I wouldn’t recommend ARCSI for what you suggest. It’s aim is to atmospherically correct imagery. The AOT value is, as 6S requires, at 550nm. Nothing more is extracted.

Best wishes,

Pete

****************************************************
* Dr Pete Bunting
* Reader in Remote Sensing
* Earth Observation and Ecosystem Dynamics Group
* Department of Geography and Earth Sciences
* Aberystwyth University
* Aberystwyth
* Ceredigion
* SY23 3DB
* UK
*
* Ph: +44 (0) 1970 622615
* Mob: +44 (0) 7917 842743
* Email: p...@aber.ac.uk
* ORCID: http://orcid.org/0000-0002-7435-0148
****************************************************
"Please consider the environment before printing this email or any documents attached”

> >> To unsubscribe from this group and stop receiving emails from it, send an email to rsgislib-suppo...@googlegroups.com.
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[Adhithya S Rajan]

Thank you for your time! Do you recommend any other method?

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>
>
> --------------------------------------------------------------------
> Un o’r 4 prifysgol uchaf yn y DU a’r orau yng Nghymru am fodlonrwydd myfyrwyr.
> (Arolwg Cenedlaethol y Myfyrwyr 2016)
> www.aber.ac.uk
>
> Top 4 UK university and best in Wales for student satisfaction
> (National Student Survey 2016)
> www.aber.ac.uk
>
>
>
> --
> Adhithya S Rajan
> Data Scientist
> Earth2Orbit Analytix (E2O)
> Bangalore
>
> +919206105250
> adhi...@earth2orbit.com
>



--------------------------------------------------------------------
Un o’r 4 prifysgol uchaf yn y DU a’r orau yng Nghymru am fodlonrwydd myfyrwyr.
(Arolwg Cenedlaethol y Myfyrwyr 2016)
www.aber.ac.uk

Top 4 UK university and best in Wales for student satisfaction
(National Student Survey 2016)
www.aber.ac.uk

[Pete Bunting [pfb]]

Dear Adhithya, 

I am not aware of anything but I have not done any work looking at atmospheric pollution so not the person to ask. 

Best wishes, 

Pete

****************************************************
* Dr Pete Bunting
* Reader in Remote Sensing
* Earth Observation and Ecosystem Dynamics Group
* Department of Geography and Earth Sciences
* Aberystwyth University
* Aberystwyth
* Ceredigion
* SY23 3DB
* UK
* 
* Ph: +44 (0) 1970 622615
* Mob: +44 (0) 7917 842743
* Email: p...@aber.ac.uk
* ORCID: http://orcid.org/0000-0002-7435-0148
****************************************************

"Please consider the environment before printing this email or any documents attached”

[Daniel Clewley]

You might want to look at some of Robin Wilson's work. He developed Py6S and his thesis was on AOT retrieval (http://www.rtwilson.com/academic/phd).

Dan

[Adhithya S Rajan]

Thank you!

This will help me a lot!

Adhithya S Rajan

Data Scientist

Earth2Orbit Analytix (E2O)

Bangalore

+919206105250

adhi...@earth2orbit.com