README.md

In PMassicotte/isin: Convert L3BIN Index to Geographical Coordinates

isin

Support the NASA / GlobColour / CCI ISIN grid used for MODIS L3BIN satellite products. This package can be installed as follow:

devtools::install_github("PMassicotte/isin")

Examples

library(isin)

## Create test dataset
bin_num = c(245535, 245536, 247290, 249046, 249047, 250809)

Convert bin index to latlon

The bin2latlon() function converts a MODIS bin index to longitude and latitude.

df <- bin2latlon(bin_num)
df
#>   longitude  latitude
#> 1 -162.2057 -78.31250
#> 2 -162.0000 -78.31250
#> 3 -161.2415 -78.27084
#> 4 -161.3159 -78.22916
#> 5 -161.1117 -78.22916
#> 6 -161.3793 -78.18750

Convert latlon to bin index

The latlon2bin() function converts a pair of longitude/latitude to a MODIS bin index.

latlon2bin(lat = df$latitude, lon = df$longitude)
#>   bin_index
#> 1    245535
#> 2    245536
#> 3    247290
#> 4    249046
#> 5    249047
#> 6    250809

Credit

The C/C++ code is almost entierly based on oceancolor algorithm. Credit should be given to them.

PMassicotte/isin documentation built on May 7, 2019, 11:51 p.m.