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Questions tagged [atmospheric-correction]

Atmospheric correction is the process of removing atmospheric factors that influence the values in remotely sensed imagery.

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What are the available global GNSS corrections?

How can I find out what GNSS corrections are available in a location? For example, in the United Arab Emirates (24°03'22.8"N 55°46'42.9"E) what corrections are available to me assuming I have the ...
2
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0answers
168 views

Earth Engine Sentinel-2 atmospheric correction

I want to run some time series analysis on sentinel-2 data in EE for my master thesis. However the algorithms for Sen-2 in EE are scarce. The biggest issue is that there isn't any for atmospheric ...
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45 views

RadCor Error in .local(x, …) : invalid layer names

I'm trying to do simple atmospheric corrections on a LandSat8 brick raster using the function 'radCor'. No matter what function I try I always get the response Error in .local(x, ...) : invalid layer ...
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2answers
149 views

Strips/scratches on PlanetScope imagery

I'm doing a project that evaluates the practicality of using remote sensing imagery in agricultural field management. I noticed there are some scratches/strips on PlanetScope imagery for one of the ...
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0answers
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6s atmospheric correction for hyper spectral data

I am trying to customize atmospheric correction for hyper-spectral data. Presently for Landsat I am using the i.atcorr GRASS GIS module. I want to know whether 6S atmospheric correction can be used ...
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3answers
560 views

Atmospheric correction algorithm in Python or R for Landsat 7 ETM+

I am looking for an algorithm which can be tuned in python or R for atmospheric correction for Landsat 7 ETM. Searching Google I have found only a few algorithms in ENVI or ERDAS which are not ...
6
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1answer
236 views

6S atmospheric correction results wrong

I'm using 6s to correct sentinel data, but there is a little deviation that tells me that I'm doing something wrong. This is the result for example of one scenario: **********************************...
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0answers
45 views

Data for atmospheric correction with 6s from Modis [closed]

I want to make an atmospheric correction with Py6S. So, I want to get ozone, water vapor, AOT from Modis - MYD08_D3. I got water vapor from dataset "Atmospheric_Water_Vapor_Mean". The average value ...
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0answers
85 views

Age of RTK corrections - fixed solution accuracy

Does anyone know how the age of NTRIP corrections influences accuracy of an RTK solution? I read somewhere that correction loss for few seconds or even a minute may still be acceptable for some ...
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0answers
232 views

Atmospheric Correction of Sentinel-2 using QGIS

How can I get the ENVI output format from the Sentinel-2 images after Atmospheric Correction in QGIS ?
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1answer
93 views

Is it required to do DOS using Sentinel 2 image for land cover change detections

Sentinel 2 imagery is already ortho-corrected and georeferenced. However I wish to know how important it is to correct further and which correction to carry out.
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Are there any established formula to calculate extinction coefficient profile from hydrometer profiles?

I am trying to use the multiscatter program developed by Dr Hogan http://www.met.rdg.ac.uk/clouds/multiscatter for calculating radar reflectivity profiles. This program needs an extinction profile ...
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2answers
1k views

Removing cloud cover using Sentinel Toolbox?

According to the ESA website it would appear possible to remove cloud cover form Sentinel data using the Seninel-2-Toolbox. Is this really possible or are they refering to the method of mosaicking ...
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205 views

Open source absolute atmospheric corrections for Sentinel-2

I am searching for open source absolute atmospheric correction processors for Sentinel-2. There are many of proprietary ones (FLAASH, QUACS, MACCS) which I cannot use for my study. Beside DOS1 (QGIS ...
2
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1answer
208 views

Are landsat 8 SR and TOA rasters calibrated/corrected data or the data to be used for calibration/correction?

I downloaded Landsat 8 Level-2 scenes from https://espa.cr.usgs.gov/ for land cover classification. Following are the product list in the package, cause I ticked Top of Atmosphere Reflectance (TOA), ...
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1answer
192 views

What are the necessary correction/calibration on Landsat 8 imagery for land cover classification? [duplicate]

I downloaded calibrated/corrected Landsat 8 data (Level 2) from ESPA (https://espa.cr.usgs.gov/) to do land cover classification. But there are many corrections and calibrations can be done as listed ...
2
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2answers
217 views

Are Landsat 8 data from ESPA corrected and calibrated?

I am trying to figure out Landsat 8 data corrections and calibrations. Actually, I don't really know how this can be done and which data needs what kind of correction and calibration for further ...
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1answer
127 views

Does RapidEye level 3A imagery need any kind of preprocessing before applying classification?

I just got some rapideye images and I would like to know if there is need of any preprocessing before applying classification to it? I know that there isn't any automated way of, for example, applying ...
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2answers
411 views

Calculating NDVI using Landsat 8- Cloud/Atmospheric Correction

System: Windows 7 Software: Arcmap 10.4.1 Data: Landsat 8, NDVI calculations I am attempting to calculate the NDVI values over my state over a period of 3 months. Naturally, there are going to be ...
3
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1answer
133 views

Atmospheric effects on extracting soil from BSI index

I need to extract soil from Bare Soil Index (BSI) using Landsat 8 and Sentinel 2 images in QGIS or IDRISI. I was told to start with basic atmospheric correction of bands by finding in the histogram ...
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1answer
198 views

ENVI FLAASH Error

I try to run FLAASH on a Landsat 8 image. I radiometrically corrected the image using FLAASH output parameters using ENVI 5.4. It gives me the error message: ACC error: modrd5:reading archive file ...
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0answers
55 views

Atmospheric correction in ENVI, export to ERDAS

I am working on a project using Hyperspectral imagery and have ERDAS Imagine on my home PC and have access to ENVI on another PC at University. Is it possible, for example, to perform the atmospheric ...
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0answers
263 views

Using GRASS GIS 7.3 for Atmospheric Correction of Sentinel-Data [closed]

I read that GRASS GIS version 7.3 will be able to atmospheric correct Sentinel-2 Data. After downloading this version, which is still in development, I imported the Data and put all needed information ...
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0answers
274 views

How to do topographic correction of Landsat 8 image in ERDAS?

I am trying to perform a topographic correction of a Landsat 8 image using the C method described in the paper below. I am doing this in ERDAS IMAGINE Spatial Modeler. However, I am not sure how to ...
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2answers
203 views

Loading satellite spectral bands in Ipython error

I am quite new to working in the prompt for image analysis and data handling, so I realize this might very well be a very silly problem. In any occasion, I am using my tutor's code in order to ...
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2answers
345 views

Calibrating Landsat Level-1 Precision and Terrain (L1TP) corrected data?

My study will involve Landsat OLI, ETM+ and TM scenes for forest biomass change assessment (Time Series Analysis) using different vegetation indices and textures. According to the official site https:/...
5
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2answers
187 views

Sentinel-2 images color cast

I work with Sentinel-2 images (Level-1C products (top-of-atmosphere reflectances)). I would like to know why some of the images do have this blue(?) undertone/color cast. I think those images are from ...
5
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1answer
172 views

Sun glints and landsat 8 surface reflectance product

I was wondering if the Landsat 8 surface reflectance product needs to be corrected for sun glints if I want to use it for atmospheric correction over water surfaces. I'm actually working on ...
3
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0answers
160 views

Identifying pixels with sun glint in a satellite image (for atmospheric correction)

Wondering if anyone knows a way (perhaps objective) to identify pixels that are infected with sun glint in an image. I'm using Hedley's 2005 approach in a python to deglint my image but this approach ...
1
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1answer
105 views

Atmospheric correction of Landsat 7 slc-off images

I am interested in finding the change in land cover particularly forests. I am working with slc-off images (no other sensor images available for my study). I have done the gap-filling in Erdas Imagine ...
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0answers
47 views

Scaling factor for atmospheric correction in GEOMATICA

Wondering if there's any one who's familiar with using ATCOR for atmospheric correction in GEOMATICA. What is the best scale factor? I used the default setting and then divided my image by 1000. This ...
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2answers
193 views

How to interpret 6S atmospheric correction results?

i apply 6S atmospheric correction on Landsat 8 imagery. My study area is in the ocean. After applying 6S atmospheric correction, there is a negative value in my result instead of being between 0 to 1. ...
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0answers
71 views

Improving FLAASH atmospheric correction to accurately represent subtle features in a target's spectral profile?

I am attempting to use ERDAS target detection models to detect/differentiate a specific type of soil from a general background. We have gathered spectral signatures of the target soil in the field ...
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0answers
157 views

i.atcorr - Landsat 8

I am trying to apply atmospheric correction to Landsat 8 scenes using i.atcorr. After tons of tests I am still struggling with the correct input and output range. The results deriving from radiance as ...
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0answers
229 views

Atmospheric correction using FLAASH

I want to run atmospheric correction on my Landsat TM5 picture using FLAASH (ENVI 4.8) but when I input radiance image (BIL format) into it, then this message is shown: "Enter ASCII filename ...
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1answer
100 views

Atmospheric correction and difference(s) between ATCOR and FLAASH [closed]

Talking about atmospheric correction, I'm interested in knowing the difference between ATCOR and FLAASH given that both are based on MODTRAN. Anyone happened to know this or have a recommended text?
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3answers
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Carrying out atmospheric correction on Sentinel-2 data from Amazon Web Services?

I'm wondering what the best method is for correcting Sentinel-2 images downloaded in JP2 format (from Amazon Web Services - AWS) to BOA reflectance? As the files downloaded from the sentinel scihub in ...
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1answer
377 views

6S atmospheric correction method for Landsat 8

I m not clear with 6S atmospheric correction. which image we use to run 6S atmosphere as an input image to calculate coefficient xa,xb and xc top of atmosphere radiance or top of atmosphere ...
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1answer
315 views

Atmospheric correction with FLAASH

I see that people have suggested this post correction equation ((b1 le 0)*0+(b1 ge 10000)*1+(b1 gt 0 and b1 lt 10000)*float(b1)/10000) for atmospheric correction using FLAASH (where surface ...
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0answers
36 views

minimum number of pixel points for regression on atmospherically corrected satellite images

I am performing atmospheric correction on a Landsat 8 image using different methods to check which one works best (in order to proceed with further/subsequent analysis). Wondering if it's okay to use ...
4
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1answer
884 views

Dark Object Subtraction using Top of Atmosphere Reflectance?

I'm working on a WorldView 3 image in QGIS and have been told to use Dark Object Subtraction (DOS) to atmospherically correct it to surface reflectance using the raster calculator. I have the Top of ...
2
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1answer
100 views

Why are colour distorted at large solar zenith angle in satellite image?

Most Earth observation satellites consider large Solar Zenith Angle as undesirable are therefore do not process them. There are indeed several known image quality issues, such as low signal (inducing ...
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0answers
105 views

atmospheric correction with PCI

I'm not very experienced in this. I am atmospherically correcting Landsat 8 images with ATCOR module in PCI Geomatica. I see that my final output reflectance values are not between 0.1 to 1.0, ...
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0answers
50 views

SPOT 1 HRV Atmospheric correction in GRASS GIS 7 returns NULL values

I'm having trouble using i.atcorr in GRASS 7. I am using 3-band SPOT 1 HRV image (Green, Red, NIR bands). Performed the i.atcorr for each band using the 6S parameters below (last parameter changed ...
3
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1answer
6k views

Sentinel 2A L1C product convertion from TOA reflectance to BOA reflectance

How can I convert the TOA reflectance values of L1C Sentinel2A products to BOA (Bottom Of Atmosphere) reflectance values? Is there an equation?
2
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2answers
1k views

How to find out whether a satellite image is atmospherically corrected

I have a satellite image and I am not sure whether an atmospheric correction has been done with the image. Is there a way to find that out by looking at some values? A atmospheric correction was ...
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0answers
43 views

Issues with using FLAASH on GeoEye data

I am trying to carry out a FLAASH atmospheric correction on radiometricaly corrected GeoEye-1 spatial image (working within ENVI). I am getting the wrong results from my FLAASH correction and believe ...
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0answers
149 views

Will Grass GIS 6s atmospheric correction take raster as input for atmospheric parameters

I am working on atmospheric correction using 6s in Grass 6.4.4 version(i.atcorr module). I want to use raster data set for atmospheric parameters. Presently I am creating an icnd (input condition)...
3
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1answer
556 views

Atmospheric Correction for multiple Landsat-8 scenes

I need to perform an atmospheric correction for Landsat-8 data and can't find a solution. There is a very limited amount of information dealing with L8-correction methods in a comprehensive way, that'...
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0answers
62 views

Pre-processing in remote sensing [duplicate]

I have a bit of confusion on the pre-processing of remote sensed images. Do atmospheric correction methods such as Dark Object Subtraction convert the DN into reflectance values? If not, it is ...