All Questions
Tagged with reflectance toa-calibration
7 questions
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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)) / ...
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1
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1
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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(...
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1
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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 ...
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1
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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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4
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1
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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 ...
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4
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1
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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)...
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4
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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 ...
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