These are worker functions to read a specific file from the remote sensing data collection.
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the index of the file
the table of file names and dates
These functions encapsulate specific optimizations for extracting time series maps for the study. The 'i-th' index is one of the rows of the 'files“ data frame.
The specific data sets in use are:
'read_i_ice' reads the NSIDC SMMR-SSM/I Nasateam daily sea ice concentration, Passive-microwave estimates of sea ice concentration at 25km spatial resolution. Daily and monthly resolution, available from 1-Oct-1978 to present. http://nsidc.org/data/nsidc-0051.html
'read_i_sst' reads the NOAA Optimum Interpolation 1/4 Degree Daily Sea Surface Temperature Analysis, Sea surface temperature at 0.25 degree daily resolution, from 1-Sep-1981 to present. Richard W. Reynolds, Viva F. Banzon, and NOAA CDR Program (2008): NOAA Optimum Interpolation 1/4 Degree Daily Sea Surface Temperature (OISST) Analysis, Version 2. [southern hemisphere, 1981-2016]. NOAA National Climatic Data Center. doi:10.7289/V5SQ8XB5 [November, 2016] http://www.ngdc.noaa.gov/docucomp/page?xml=NOAA/NESDIS/NCDC/Geoportal/iso/xml/C00844.xml&view=getDataView&header=none
'read_i_u', 'read_i_v' and 'read_i_mag' read 0.25 degree Ssalto/Duacs gridded absolute geostrophic velocities, Absolute geostrophic velocities computed from gridded sea surface heights above geoid from satellite altimetry (delayed and near-real-time products). http://www.aviso.altimetry.fr/en/data/products/sea-surface-height-products/global/madt.html. The altimeter products were produced by Ssalto/Duacs and distributed by Aviso, with support from Cnes (http://www.aviso.altimetry.fr/duacs/
'read_i_chl' read from each of Oceandata VIIRS, MODISA and SeaWiFS Level-3 mapped 32-day 9km chlorophyll-a, rolling 32-day composite remote-sensing chlorophyll-a from the VIIRS, MODISA and SeaWiFS satellites at 9km spatial resolution". SeaWiFS is 1997-2002, MODISA is 2002-2012, and VIIRS is 2012-2016. http://oceancolor.gsfc.nasa.gov
Underlying each function is the infrastructure provided by an installation of 'raadtools' and 'raadsync': https://github.com/AustralianAntarcticDivision/raadtools https://github.com/AustralianAntarcticDataCentre/raadsync
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