Experimental Ecological Nowcasting Products

How we make the nowcasts

Combined North American Land Surface Temperatures from GOES satellites are available within 1 hour of satellite acquisition at
http://motherlode.ucar.edu/cgi-bin/ldm/genweb?native/satellite/SFC-T/SUPER-NATIONAL_1km .

Every hour on the hour, we download the most recent North American composite image to our in-house THREDDS server, which converts the original GINI format to OpenDAP format.

Every hour at 5 minutes past the hour we connect to our local THREDDS server via the OpenDAP protocol, using NOAA Ferret to save a daily aggregation of the current image data in netcdf format. We use our own THREDDS Version 3.16 server because it is the last version that allows Ferret to convert GINI files to netcdf. More recent versions of THREDDS, including the server on http://motherlode.ucar.edu:8080/thredds, do not work for this purpose.

Every hour at 13 minutes past the hour we use a program written in R which uses the netcdf format satellite data to make cumulative maps of the day's land surface temperatures, for sites exposed by the tide.

Hourly tide predictions for all GOES coastal pixel locations are made each day at 0130 GMT using the Oregon State Tide Predictor.

Pixels were chosen by hand, and represent the nearest land surface location to the intertidal zone. Latitude/longitude coordinates for each of the pixels in the composite satellite images were extracted using Unidata McIDAS-X, and GINI images on the ADDE server at the University of Wisconsin Space Sciences Engineering Center.