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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19 views
RapidEye preprocessing Levels 3A and 3B
It is not clear to me yet conversely to Landsat and Sentinel-2 how to preprocesing RapidEye, only levels 3A and 3B.
The values of the images in Level 3A and 3B are already in Radiance or are DN?
In ...
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0answers
32 views
Planetscope images atmospheric correction
I have downloaded an image which is level 3B processed (so I already have surface reflectance), but my assignment is to compare the data values of the SR file with my results.
At first I applied ...
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0answers
19 views
Is Sentinel-2A Band 8 (NIR band) has been affected by earth water vapor absorption feature?
I am starting working with S2A images. While looking at the bandwidth of S2A NIR band, it seems it has a wider area as Landsat-7 ETM+ NIR band. Previously I worked with L7 ETM+ NIR band and obtained ...
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1answer
28 views
Make Level-2 Landsat images comparable with Level-2A Sentinel-2 images
Is there a way to make Level-2 Landsat images (e.g. Landsat-5 images ordered from EarthExplorer) comparable with Level-2A Sentinel-2 images?
The objective is to calculate water or vegetation indices (...
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0answers
19 views
Doing atmospheric correction of LISS-IV standard data product?
I have purchased RS-2 LISS-IV Standard Processing Level data. The product type is Geo RPC. Metadata is in IKONOS format. I want to compute surface reflectance from original DN values.
What is the ...
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0answers
15 views
Atmospheric correction using ERDAS 2014
There are some questions about atmospheric correction using ERDAS.
Is it possible to use the atmospheric corrected satellite image to calculate NDVI and LST using ATCOR of ERDAS?
If not, I wonder if ...
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1answer
68 views
Sentinel 2 Atmospheric Correction Inconsistencies
I'm having some peculiar issues with Sentinel 2 data. I've downloaded two coterminous tiles (one L1C tile from EarthExplorer and one L1C/L2A tile from AWS) taken at the same time and date. I have done ...
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1answer
54 views
i.atcorr [GRASS] - has anyone used it and actually had success?
I am trying to apply i.atcorr to a landsat mosaic with GRASS. These are my 6S parameters:
18
01 31 22.10 178.940 -17.263
1
1
0
0.115
-0.270
-1000
116
Everytime I run it, it returns me a raster ...
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1answer
63 views
Pleiades atmospheric correction
I have phr1a and phr1b images (Pleiades) and I need to make atmospheric correction. First, I tried to do this by using Envi FLAASH. by the way, I tried also ERDAS atcor but there was also same ...
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0answers
26 views
Atmospheric correction Spot 6
I'm working with Spot images in QGIS and I want to do an atmospheric correction. I want to know if there exists a method, tutorial or a pluggin to do this. I worked with Landsat previously, but it´s ...
2
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1answer
102 views
Planet filter file for ENVI atmospheric correction
I have 4 band Planet Scope multispectral imagery that I am trying to process in ENVI. It is the analytic data, so it is already radiometrically corrected. I have converted the .tif to a BIL, and ...
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1answer
41 views
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
842 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 ...
2
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2answers
201 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
55 views
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
1k 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
315 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
54 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 ...
1
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0answers
139 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 ...
-1
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1answer
142 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.
9
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2answers
2k 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 ...
2
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0answers
283 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
312 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), ...
0
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1answer
366 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
315 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 ...
4
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1answer
180 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 ...
1
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2answers
531 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
votes
2answers
203 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 ...
1
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1answer
233 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 ...
1
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0answers
74 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 ...
2
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0answers
282 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
316 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 ...
1
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2answers
278 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 ...
5
votes
2answers
412 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
204 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
226 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
209 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
131 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
51 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 ...
1
vote
2answers
209 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. ...
2
votes
0answers
85 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 ...
2
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0answers
172 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 ...
1
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0answers
292 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 ...
-1
votes
1answer
122 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?
10
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3answers
1k views
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 ...
1
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1answer
418 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 ...
0
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1answer
539 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 ...
2
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0answers
38 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
votes
1answer
1k 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
129 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 ...
