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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How can we know that a random satellite image is atmospherically corrected or not using python?

If a satellite image in .tiff format was given. what are the values that can be obtained from a satellite image using python to see whether it has atmospheric errors or not? I am expecting what values ...
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Applying C2RCC atmospheric correction to Sentinel-2 L1C images in SNAP

Sentinel-2 Level-1C images are available in this AWS bucket. I am trying to get a Sentinel-2 L1C image of an area with an atmospheric correction done by the C2RCC Processor. I try to do this using ...
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SPOT 6/7 conversion to BOA/Surface Reflectance

I am quite new to GIS and even newer to SPOT as an image source. In general, all of the other sources I have used for analysis (Landsat 7 & 8, Sentinel-2) have been corrected to BOA reflectance ...
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Error correcting Sentinel-2 1C imagery using SIAC in Google Earth Engine

I'm working toward estimating leaf area index using vegetation indices derived from Sentinel-2 data. I would like to complete atmospheric corrections for all available TOA imagery within specific ...
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If Landsat Collection 1 is being phased out, how can alternative atmospheric corrections be applied?

I'm currently using Google Earth Engine and have seen that the Collection 1 product for Landsat 8 is being phased out and also will only be available with Landsat 9 for a year after collection. I ...
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Does Sentinel-2A Level-2A data require spectral correction?

I submitted a manuscript that uses Sentinel SAFE (Standard Archive Format) Level-2A (bottom of atmosphere) data. Sentinel-2A data includes scene classification and an atmospheric correction - https://...
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Why does the Sentinel-2 Surface Reflectance product in GEE begin on March 28, 2017?

I'm trying to figure out why the GEE Sentinel-2 Surface Reflectance product is available since March 28, 2017 (as stated here in Dataset Availability). Is this date significant? Is it possible to ...
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Haze correction of Planet SkySat Public Ortho Imagery, RGB

I am using image - https://developers.google.com/earth-engine/datasets/catalog/SKYSAT_GEN-A_PUBLIC_ORTHO_RGB for slum quantification purpose but the problem is - the image seem to have haze as image ...
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Is atmospheric correction relevant for Landsat Level2 before classification?

I am quite new in the field of remote sensing. I would like to do a separate classification of two Landsat 8 Level2 images and then do a LULCC change detection. For the pre-processing steps, it is ...
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Landsat collection 2 level 1

I am working on NDWI and MNDWI indices using Landsat 5,7 and 8 to identify permanent water bodies in two images by mosaicing them. When using Landsat collection 1 data I have performed atmospheric and ...
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Convert OMI/AURA No2 data from molecules/cm2 to micrograms/m3 (µg/m3)

Currently, I am working on OMI/AURA NO2 data which is in molecules/cm2. I need to convert it to micrograms/m3 (µg/m3) to compare with the O3 concentrations. I have gone through the user guide for OMI ...
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How to aggregate multiple NC files into gridded data

I would like to convert daily total NO2 column data into an aggregate form similar to the monthly mean tropospheric NO2 columns on said website in order to later extract statistics using shapefile(s), ...
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Spectral signatures difference between a raw image and an atmospherically corrected image

I did atmospheric correction of Landsat 5 image by Quick atmospheric correction method(QUAC), now I want to compare atmospheric corrected spectral signatures from ENVI QUAC with the input spectral ...
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Difference between two atmospherically corrected Images

I corrected Landsat 5 image with two different methods, first atmospheric correction through calibration (means converting raw image into radiance), second atmospheric correction through QUAC ...
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Identification of cloudy days based on Net Radiation data

How can I identify that a particular day is cloudy or clear sky based on the daily time series of Net Radiation (calculated at FluxNet/AMERIFlux sites)? I read somewhere that clear sky radiation has ...
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Solving color correction of LISS IV Multispectral image

I have a LISS IV multispectral images (radiometric resolution of 10 bit per pixel) taken in different months 4 tile in January and 2 tiles taken in February. While mosaicing, I got a different color ...
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Image Dodging (color matching algorithm) in ERDAS

I have two LISS 3 images acquired in Feb and March a year apart. I have performed atmospheric correction (haze reduction) for both the images individually before applying the color matching algorithm ...
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Installing packages for ACOLITE atmospheric correction; RuntimeError - HDF4 DLLs

I would like to use ACOLITE atmospheric correction with python, however, I cannot install pyhdf. The RuntimeError is following: RuntimeError: Cannot find required HDF4 DLLs -- check LIBRARY_DIRS I ...
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2 votes
1 answer
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Atmospheric correction of larger collection of Sentinel 2 L1C images (in Google Earth Engine) for NDVI time series [closed]

System: Windows 10 Software: Google Earth Engine browser, (QGIS, SNAP) Data: Sentinel 2 L1C & L2A, NDVI calculations I'm currently working on generating a NDVI timeseries in Google Earth Engine ...
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Calculate weight using distance from point for Weighted Reductions in Earth engine

I want to calculate the total yearly NO2 emission from the power plants by using Sentinel-5p NO2 data. First I defined my aoi and sum all 365 images into one image using ee.Reducer.sum(). After that ...
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1 answer
334 views

Atmospheric correction for planet images using ArcGIS Desktop

I am very much new to the field of image processing. I have several images from planetscope. 20190722_155754_1049_3B_AnalyticMS is one of them. I don't know how to process these images in ArcGIS ...
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1 answer
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Correction required to Landsat level 2 product while using it for time series analysis

I want to do time series land use change analysis using the level 2 usgs landsat product between the period of 1990 and 2016. However the algorithm that has been used to do surface reflectance ...
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Do Sentinel 2 Level-1C images need atmospherical correction before EVI calculations?

I would like to use Sentinel-2 Level 1C images to produce EVI maps using the following equation : EVI=G×(ρnir-ρred)/(ρnir+(C1×ρred-C2×ρblue )+L) Can I use the Level 1C image as it is, or should I ...
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Apply corrections to Landsat images? [closed]

Which software is better to do atmospheric and radiometric corrections in Landsat images? After the corrections, I hope them to be used in supervised classification according to land use. So is it ok ...
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1 answer
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FLAASH produces weird peaks

I am applying FLAASH to atmospherically correct and convert to reflectance a hyperspectral image acquired by our airborne system. The problem is that FLAASH (using ENVI) outputs an image where all ...
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377 views

Bidirectional reflection disturbance function (BRDF) for Landsat imagery in earth engine

I am wanting to use various vegetation indices calculated using Landsat imagery. I am aware that BRDF is an important correction to do, but I am unsure where to start. Is there a product with ...
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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 ...
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1 vote
2 answers
626 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 ...
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1 answer
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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 ...
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3 votes
1 answer
805 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 ...
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453 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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4 votes
1 answer
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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 ...
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2 votes
1 answer
130 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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2 votes
1 answer
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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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1 answer
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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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1 answer
231 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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3 votes
1 answer
349 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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2 answers
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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 ...
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2 votes
0 answers
2k 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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2 votes
2 answers
312 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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2 votes
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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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7 votes
3 answers
3k 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 ...
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6 votes
1 answer
764 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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1 vote
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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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2 votes
1 answer
434 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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9 votes
2 answers
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 ...
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2 votes
0 answers
466 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 ...
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2 votes
1 answer
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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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1 answer
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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 ...
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2 votes
2 answers
537 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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