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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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35 views

### underwater mosaic with overlapping photos

What is the best approach to creating a mosaic with underwater photos. The photos are black and white. They suffer from non-uniform illumination, i.e. the middle of the photo is bright and the edges ...
66 views

### Conversion of Landsat ToA reflectance to BoA reflectance with an equation

I am using temporal datasets from Landsat 5, 7 and 8. Since I have many datasets I would like to include the conversion from ToA(top of atmosphere) to BoA(bottom of atmosphere) reflectance into a ...
11 views

### Calculate per pixel Landsat Relative Azimuth Angle (RAA)

Iam Trying to Generate Landsat-8/OLI NBAR images. Given that USGS Landsat-8 Angtool can generate per pixel view_zenith, view_azimuth, sun_zenith and sun_azimuth angle bands. Is Relative Azimuth Angle ...
32 views

### Calculate per pixel Sentinel-2 Solar and Sensor Angle Views

I am working with Sentinel-2 images and would like to generate per pixel angle bands (view_zenith, view_azimuth, sun_zenith and sun_azimuth). Considering Sentinel-2 SAFE structure, I found that ...
51 views

### Sentinel 2 surface reflectance error Python code Google Earth Engine [closed]

We are trying to do the surface reflectance correction using Python codes in Spyder. The study area is defined as a polygon geometry and it's a fairly large area. We want to get all sentinel images ...
35 views

### Do I need to perform any corrections on Level-2 Landsat imagery?

My objective is to perform a land cover classification with multiple scenes over historical imagery (one year every decade). Most of the imagery I have downloaded is level-2 imagery. From my ...
32 views

### Atmospheric correction of InSAR interefrograms

I am trying to apply GACOS service to correct atmospheric artifacts on InSAR interferogram. In the GACOS manual provided with the GACOS_Ultility example, it is mentioned that data storage of the ...
40 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 ...
133 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 ...
24 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 ...
136 views

### Convert Planet Imagery Surface Reflectance product DN to surface reflectance values

I have a PlanetScope Ortho Scene Product (3B) which includes an AnalyticMS.tif and AnalyticMS_SR.tif files. Based on what I have read so far, the AnalyticMS_SR.tif file is scaled surface reflectance ...
45 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 (...
22 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 ...
23 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 ...
111 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 ...
58 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 ...
97 views

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 ...
28 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 ...
160 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 ...
55 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 ...
1k 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 ...
234 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 ...
71 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 ...
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 ...
405 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: **********************************...
61 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 ...
168 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 ...
164 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.
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 ...
330 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 ...
392 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), ...
449 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 ...
405 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 ...
209 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 ...
582 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 ...
250 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 ...
258 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 ...
81 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 ...
291 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 ...
341 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 ...
311 views

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 ...
465 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:/...
218 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 ...
243 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 ...
256 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 ...
144 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 ...
61 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 ...
219 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. ...