In lbusett/prismaread: Import PRISMA L1/L2 hyperspectral data and convert them to a more user friendly format

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

Format of output rasters

Outputs are provided as rasters in ENVI or GeoTiff format according to user's choice in the output_format argument of pr_convert().

Naming conventions

Filenames are built starting from the output folder name provided by the user, by adding appropriate suffixes. If out_basefile is not specified (or set to auto, the Default), output file names are created based on the filename of the hdf5 input. For example, if in_file is PRS_L1_STD_OFFL_20190825103112_20190825103117_0001.he5, the output file for the VNIR cube will be PRS_L1_STD_OFFL_20190825103112_20190825103117_0001_HCO_VNIR.envi (or .tif), that for SWIR will be PRS_L1_STD_OFFL_20190825103112_20190825103117_0001_HCO_SWIR.envi ), etcetera.

If out_basefile is specified, the filenames are created substituting the specified string. For example, if out_basefile is "myprisma", the output file for the VNIR cube will be myprisma_HCO_VNIR.envi (or .tif), that for SWIR will be myprisma_HCO_SWIR.envi ), etcetera.

Measure Units

• Measure units of the output hyperspectral data are as follows:

r my_tbl <- tibble::tribble( ~LEVEL, ~Variable, ~"Measure Units", "L1", "Radiance", "W / m^2 * sr * um", "L2B", "Radiance", "W / m^2 * sr * um", "L2C", "Reflectance", "unitless (ratio)", "L2D", "Reflectance", "unitless (ratio)" ) knitr::kable(my_tbl, digits = 3, row.names = FALSE, align = "c", caption = NULL)

Ancillary info

• If output format is "ENVI", the wavelengths of the different bands for the hyperspectral cubes are properly written in the appropriate header (.hdr) file.

• Irrespective from output format, info about wavelengths and fwhms of the hyperspectral cubes are saved in appropriate txt files. For example, if the output file is D:/myoutfolder/myoutfil_HCO_VNIR.envi, info about the wavelengths is saved in D:/myoutfolder/myoutfil_HCO_VNIR.wvl

• Info about acquisition date and angles is saved in a dedicated txt file. For example, if output file is D:/myoutfolder/myoutfil_VNIR.envi, info about the angles is saved in D:/myoutfolder/myoutfil_HCO_VNIR.ang

lbusett/prismaread documentation built on Feb. 22, 2022, 7:33 p.m.