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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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Why Skysat analytic surface reflectance products have wierd reflectance in shadows?

I have a skysat analytic_SR image. I did not get any .json file related to atmospheric correction parameters as they say. I can only get the Planet notes on planetscope for surface reflectance (see ...
vars's user avatar
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Topographic correction

I am trying to code the topographic correction and I get this error: "Image (Error) Image.constant: Parameter 'value' is required." I have seen a similar script for an entire collection, ...
djebbouri mohammed's user avatar
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Does MODIS dataset (MOD09GQ) require atmospheric correction to calculate NDVI?

It took a dataset of satellite images with a high frequency of reception (1 day) to work. The work consists in studying the change in the NDVI coefficient at a certain site during the year. I took ...
senek's user avatar
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Use of bitmask to remove undesired pixels from an image collection

I am using the HSL30 product to download monthly images for a single year. As it is now, I am not accounting for clouds, cloud shadows, snow/ice in the image collection. I would like to remove pixels ...
Nikos's user avatar
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Direct use of Sentinel 2 L2A imagery for vegetation analysis

I am working on my research to calculate the green vegetation in the study area using sentinel 2 L2A 10m resolution. Do I need to perform any correction or smoothing before analysis?
Monika Jirel's user avatar
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Atmospheric Correction of Sentinel 2 L1C images

I'm trying to perform Atmospheric Correction of Sentinel-2 LIC images using the repo of Elias Berra as suggested in the post Multiple atmospheric correction for Sentinel-2 L1C imagery in Google Earth ...
rekha's user avatar
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USING THE SENSOR INVARIANT ATMOSPHERIC CORRECTION - SIAC, CREATING AN IMAGE COLLECTION WITH THE OUTPUT FOR FURTHER ANALYSIS IN GEE

My aim is to atmospherically correct sentinel 2 level 1c image in Ethiopia, and then perform a cloud mask. My next aim is to create a monthly median composite of the atmospherically corrected / Cloud ...
David Appiah-Gyimah's user avatar
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Top of Atmosphere of Landsat 8 bands

I am trying to calculate the Top of Atmoshpere using the corresponding coefficients. The raster calculator in ArcGIS however is giving me incorrect results. The formula I am using is ((0.00002 * .tif ...
Andrew Rickard's user avatar
1 vote
1 answer
96 views

Atmospheric correction for Airbus imagery

I have purchased images from Airbus using sentinel hub and realized that they are TOA (top of atmosphere). I would like to apply atmospheric correction on the images. I have seen the FLAASH is very ...
ReutKeller's user avatar
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Problem with Atmospheric Correction for Sentinel-2 in QGIS

This is my first time trying to use DOS1 method in Sentinel-2 I have four images to mosaic in L1C and need them to be L2A. I have tried: Atmospheric correction in QGIS at the L1C files I downloaded ...
Mariana's user avatar
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Landsat 8 - Collection 1 BQA vs Collection 2 QA_PIXEL

I am working on updating a Python program for atmospherically correcting Level 1 Landsat 8 data from Collection 1 to Collection 2, as Collection 1 data is discontinued and will no longer be available ...
bashful_creature's user avatar
2 votes
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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 ...
Omkar Tummala's user avatar
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707 views

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 ...
zabop's user avatar
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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 ...
ecoQs's user avatar
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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 ...
wpeay26's user avatar
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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://...
nateroe's user avatar
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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 ...
Chip's user avatar
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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 ...
polymathic's user avatar
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1 answer
761 views

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 ...
zeng01's user avatar
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1 answer
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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 ...
newbie10's user avatar
1 vote
1 answer
2k views

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 ...
Bhargavi's user avatar
2 votes
0 answers
116 views

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), ...
Nicholas L's user avatar
1 vote
0 answers
49 views

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 ...
Autodidact's user avatar
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175 views

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 ...
Autodidact's user avatar
1 vote
0 answers
83 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 ...
raghav's user avatar
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2 votes
0 answers
59 views

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 ...
NEHA GUPTA's user avatar
0 votes
2 answers
398 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 ...
Deepthi's user avatar
0 votes
1 answer
519 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 ...
Luckasino's user avatar
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2 votes
1 answer
766 views

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 ...
Maarten Meijer's user avatar
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1 answer
229 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 ...
Niyamat Ullah's user avatar
0 votes
1 answer
528 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 ...
Madushani's user avatar
2 votes
1 answer
450 views

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 ...
sdm's user avatar
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2 votes
1 answer
397 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 ...
Marie-Charlotte's user avatar
0 votes
2 answers
84 views

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 ...
user155448's user avatar
0 votes
1 answer
65 views

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 ...
El Amraoui Abdelilah's user avatar
1 vote
1 answer
905 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 ...
JMilner's user avatar
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2 votes
0 answers
46 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 ...
user150251's user avatar
1 vote
2 answers
1k 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 ...
gispaew's user avatar
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0 votes
1 answer
301 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 ...
Julie W.'s user avatar
3 votes
1 answer
2k 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 ...
Kevin Yang's user avatar
1 vote
0 answers
644 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 ...
Joanne's user avatar
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4 votes
1 answer
1k 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 ...
StarterPack's user avatar
2 votes
1 answer
214 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 (...
Hakim's user avatar
  • 956
3 votes
1 answer
371 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 ...
instructorjack's user avatar
0 votes
1 answer
333 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 ...
La Cordillera's user avatar
0 votes
1 answer
393 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 ...
noruinis's user avatar
3 votes
1 answer
434 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 ...
Katie's user avatar
  • 31
0 votes
2 answers
83 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 ...
Stalemate's user avatar
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 ...
ApoG's user avatar
  • 61
2 votes
2 answers
386 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 ...
M八七's user avatar
  • 329