Questions tagged [toa-calibration]

For questions related to calibration techniques for Time of Arrival (TOA) calculations for Radiolocation (the process of finding the location of something through the use of radio waves). This can also apply to Top of Atmosphere (ToA) reflectance.

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Getting exiftool.exe is not found

I have had two problems with this error. Firstly, I was trying to use the vertical photo placer plugin in QGIS but the error kept saying "exiftool.exe is not found" even though I downloaded ...
Jas Singh's user avatar
0 votes
1 answer
97 views

sen2cor failing with "TCI image export failed"

I'm trying to calibrate some Sentinel L1C products to get level 2 data, but I always end up with the following message. Any idea what could cause that? I have tested it with sen2cor 2.8.0 and sen2cor ...
pesekon2's user avatar
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2 votes
1 answer
548 views

Radiance and Raw Image difference after Radiometric calibration

I have done Radiometric calibration on Envi 5.3 and got the output of my input Landsat 5 image. What is the difference between the raw image and the radiance image and why is this value of radiance ...
Autodidact's user avatar
0 votes
1 answer
2k views

GEE Python API: Mapping a function across ee.List and ee,ImageCollection

I have a function that I would like to map across an ee.List, and map it over an ee.ImageCollection of raw DN images. So far it is looking like (using wrapper functions): def perturb_image(pert_matrix)...
sbab's user avatar
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1 vote
0 answers
272 views

Calculation of TOA radiance from Sentinel-2 1C product reflectance

I was trying to convert the Sentinel-2 1C product to radiance and came across two links first once says radiance = ((pixelValueBandX * cos(incidenceAngle) * solarIrradianceBandX) / (pi * d2)) / ...
Naresh's user avatar
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1 answer
302 views

Radiometric calibration of WorldView-2 imagery using ArcGIS Pro

I am attempting to work with worldview-2 imagery that I have downloaded and I am trying to radiometrically calibrate the raw imagery following the methodology outlined here. Since these are my first ...
user44796's user avatar
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1 vote
1 answer
627 views

Converting Landsat8 DN to TOA reflectance using GEE manually

I'm fairly new in Google Earth Engine and JavaScript. I'm trying to convert Landsat8 DN to TOA reflectance using GEE using a function. // Load a raw Landsat scene and display it. var image = ee.Image(...
Kaelel Bilang's user avatar
0 votes
1 answer
979 views

Radiometric, reflectance and atmospheric correction for Landsat 8 image

I am struggling with the pre-processing process for landsat8 imagery. I want to use some indices (e.g. NDVI, SAVI, EVI, NDMI) and create a land cover map at the end using ENVI and ArcGIS. As a ...
Kyoko's user avatar
  • 55
1 vote
1 answer
718 views

Convert a collection of raw Landsat 8 scenes to top-of-atmosphere reflectance

This link , use ee.Algorithms.Landsat.TOA(input) to convert a raw Landsat scene to top-of-atmosphere reflectance (TOA). I am trying to convert a collection of raw Landsat 8 scenes (LANDSAT/LC8 ) to ...
Minh Shines's user avatar
2 votes
1 answer
915 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), ...
Vandka's user avatar
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2 votes
2 answers
565 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 ...
Vandka's user avatar
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1 vote
1 answer
75 views

GDAL deletes metedata file when creating GTiff

Reposting question explaining it better. I am doing TOA corrections on Landsat8 Images in Python(3.5) by reading all image_bands and after processing them creating new GTiff of those images with GDAL,...
Ivan's user avatar
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1 vote
1 answer
235 views

When calculating temperature from Landsat is it necessary to use TOA?

I'm attempting to calculate temperature from Landsat 5 and 8 thermal bands. I've already calculated NDVI, where the NDVI bands were corrected using dark object subtraction. I see that many people use ...
user5858's user avatar
  • 405
0 votes
1 answer
628 views

How to convert the DN values of Resourcesat-2 LISS-3 images to Radiance?

Does somebody knows How to convert to Radiance the Resourcesat-2 LISS-3 images? I found a paper "Pre-flight Radiometric and Spectral Calibration of Resourcesat-2ALISS3* payload", where they ...
Bindini's user avatar
  • 419
4 votes
1 answer
1k views

WorldView 3 level OR2a processing - do I have data as DNs?

I have a World View 3 image which is level Ortho Ready Standard Imagery (OR2A) processed and I wish to ascertain what this processing level means. I need to work on surface reflectance and am aware ...
beadyeyes's user avatar
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1 vote
1 answer
173 views

After doing TOA correction to a lansat 8 image band using raster calculator, the reflectance is slightly out of range. Why is that so?

the reflectance range was like for example 0.0023 to -1.02356 for some band and -0.0156 to 0.009. Why is this reflectance range slightly out of range? Isn't it should be in exactly in between 0 to 1. ...
KGISdummy's user avatar
1 vote
1 answer
467 views

Higher NDVI than SAVI [duplicate]

I have calculated NDVI and SAVI for landsat-8 image. But I am getting higher value of NDVI than SAVI Can you tell me reason for this NDVI=0.46 SAVI=0.34 Specific band pixel values are toa b4- 0.130 ...
user68684's user avatar
4 votes
1 answer
2k views

Differences between mWm-2sr-1(cm-1)-1 and W/m^2 * sr * um

I'm confused about the use of this quantity. For example eumetsat on pag. 16 radiance is equal to: Physical Units = Cal_Offset + (Cal_Slope x Level 1.5 Pixel Count) expressed in mWm-2 sr-1 (cm-1)...
Marco Ciaramella's user avatar
4 votes
1 answer
3k views

Is the reflectance required to get the NDVI, for Landsat 8 images?

I'm a beginner in satellite optical imagery. I have a landsat 8 image (11 bands downloaded from http://earthexplorer.usgs.gov/) for which I need to calculate the NDVI (Normalized Difference Vegetation ...
Hakim's user avatar
  • 956
9 votes
2 answers
4k views

Landsat8 DN to TOA Reflectance (minus values)

I'm learning how to perform atmospheric correction manually, hence not using the automated methods available in ENVI metadata (band 1) for my Landsat 8 scene is as follows; RADIANCE_MULT_BAND_1 = 1....
kyuss's user avatar
  • 93
4 votes
1 answer
643 views

Which preprocessing comes first for pansharpened imagery- atmospheric correction or orthorectification?

For pansharpened imagery, what preprocessing method to do first- is it atmospheric correction or orthorectification? From my readings, it seems the former but the rational polynomial coefficients or ...
bean's user avatar
  • 71
3 votes
3 answers
2k views

Atmospheric correction for pansharpened imagery? [closed]

In converting DN values to radiance as well as reflectance, do we use the same equations in raw satellite imagery for pansharpened products? I saw this DigitalGlobe technical note for DN to radiance ...
bean's user avatar
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