Questions tagged [atmospheric-correction]
Atmospheric correction is the process of removing atmospheric factors that influence the values in remotely sensed imagery.
86
questions
0
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0answers
24 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, ...
0
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1answer
36 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 ...
0
votes
1answer
30 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 ...
0
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0answers
7 views
Calculating zenith total delay from GNSS data
I am working on correcting atmospheric anomalies in InSAR images. I want to take freely available GNSS data from various CORS and extract the zenith total delay. In one of the papers I read they used ...
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0answers
16 views
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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0answers
109 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 ...
0
votes
0answers
39 views
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 ...
0
votes
1answer
43 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 ...
0
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1answer
124 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 ...
1
vote
0answers
19 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 ...
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0answers
30 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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2answers
38 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 ...
0
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0answers
30 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 ...
-2
votes
1answer
153 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 ...
2
votes
0answers
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 ...
1
vote
1answer
231 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 ...
0
votes
1answer
131 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 ...
2
votes
1answer
94 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 ...
1
vote
0answers
273 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 ...
3
votes
1answer
347 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 ...
2
votes
1answer
63 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 (...
2
votes
1answer
171 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 ...
0
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1answer
79 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
144 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 ...
2
votes
1answer
224 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 ...
0
votes
2answers
62 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
votes
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
votes
2answers
259 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 ...
1
vote
0answers
95 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 ...
7
votes
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 ...
6
votes
1answer
496 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
69 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
vote
0answers
232 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 ...
-2
votes
1answer
197 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
votes
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
votes
0answers
385 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
votes
1answer
493 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
votes
1answer
530 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
votes
2answers
490 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
votes
1answer
257 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
vote
2answers
636 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
310 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
vote
1answer
315 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
vote
0answers
92 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
votes
0answers
310 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 ...
0
votes
0answers
363 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
vote
2answers
383 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
546 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:/...
6
votes
2answers
236 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
votes
1answer
273 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 ...
