Geographic Information Systems

Questions tagged [atmospheric-correction]

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

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Atmospheric correction of aerial photographs (R,G,B, NIR)

I have been looking for resources to perform atmospheric correction of aerial images (not satellite images). I am even wondering if it is necessary to attempt atmospheric correction for images taken ...
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Negative pixel values after Dark Object Subtraction

I am trying to make an atmospheric correction to my image in ENVI for which I am using Dark Object Subtraction tool. However, it gives negative pixel values in the resulting image. What does it imply?
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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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23 views

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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67 views

How to find the Minimum value for the Dark Object Subtraction in ERDAS?

I have a Landsat 7 Image with MTL file showing minimum value as 1 and the maximum value is 255. The water pixels show a range of 63 to 74. In the image, there are a few pixels that have a value of 1, ...
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2answers
78 views

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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1answer
108 views

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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What's the lat/long coordinates in atmcorr.gsfc.nasa.gov?

I want to get Atmospheric Correction Parameter Calculator using https://atmcorr.gsfc.nasa.gov/. in this site request latitude and longitude coordinates. My question is what are these coordinates? ...
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251 views

Atmospheric correction of larger collection of Sentinel 2 L1C images (in Google Earth Engine) for NDVI time series

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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What are the appropriate input/output ranges for WorldView 2 in GRASS i.atcorr module?

Can anyone speak to the appropriate range/datatype of WorldView2 rasters when using the i.atcorr module in GRASS GIS? I.atcorr requires the input raster be in at-sensor-radiance first, which I have ...
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1answer
82 views

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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1answer
230 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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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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1answer
44 views

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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1answer
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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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1answer
219 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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38 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 ...
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373 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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1answer
170 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 ...
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1answer
250 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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340 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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1answer
491 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 ...
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1answer
73 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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1answer
212 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
113 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
173 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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1answer
255 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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2answers
65 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 ...
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0answers
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 ...
2
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2answers
276 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
107 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
2k 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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1answer
594 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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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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263 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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1answer
219 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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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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410 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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1answer
551 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
592 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 ...
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2answers
515 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
272 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
672 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 ...
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2answers
353 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
374 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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