lonlat24km: 24km Lat-Lon data

In ABoVE-AotM/above: Functions and methods for the Animals on the Move project of the Arctic Boreal Vulnerability Experiment (ABoVE - NASA).

Description

The NCSID 24 km snow coverage products is provided as an ascii file with 1024 rows x 1024 columns using a polar projection centered around the north pole and covering the northern hemisphere. The actual latitude and longitude coordinates of the data are provided separately as bin files - which are converted to a matrix here.

Usage

data(lonlat24km)

Format

Two 1024 x 1024 matrices: lon.matrix and lat.matrix - of the longitudes and latitudes, respectively, of the snow grid. A vector of xs and ys - coordinates that map the longituded and latitude to a unit circle. Finally, a data frame lonlat.df which contains the midpoint, ll, ul, ur, and lr corners of each of the 1024 x 1024 = 1048576 lat-lon polygons

Details

The raw lat-lon bin files are posted by NSIDC here: ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G02156/metadata/

Source

National Ice Center. 2008, updated daily. IMS Daily Northern Hemisphere Snow and Ice Analysis at 1 km, 4 km, and 24 km Resolutions, Version 1. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N52R3PMC.

Examples

data(lonlat24km)
dim(lat.matrix)
dim(lon.matrix)
require(fields)
image.plot(xs, ys, lat.matrix, main = "latitude")
image.plot(xs, ys, lon.matrix, main = "longitude")

ABoVE-AotM/above documentation built on May 28, 2020, 6:08 a.m.