Interactive contour maps of surface temperature anomalies in 2016

Data taken from NOAA’s NCEP reanalysis products available at:

• http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.surface.html

and using this download URL:

• ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.derived/surface/air.mon.mean.nc

Note that the baseline climate is computed using 1986-2015 data from the same reanalysis product. In addition, the displayed surface temperature anomaly fields were smoothed in longitude and latitude using a boxcar filter.

Libraries used

• NetCDF.jl to pre-process the NetCDF data into surface temperature anomalies JSON outputs.

• d3 v4 in particular d3-geo to draw the map in Canvas2D and d3-geo-projection to use the Winkel triplets projection.

• surface-nets to compute the contours levels.

Usage

Install JavaScript and Julia dependencies:

make deps

Make HTML page (along with all its required built files):

make index.html