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Update dfhill_swe_calculator.m
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We have prepared a simple function in Matlab that will calculate snow water equivalent
based on day, month, year, lat, lon, and snow depth at the observation point. In this
repo you will find a single matlab (.m) function file, two zipped ESRI ASCII grid files,
and one (.rtf) file with information about the grid files. The grids contain climatological
normals of winter precipitation (Dec-Jan-Feb) and temperature difference (diff between
mean T of warmest month and mean T of coldest month). To use, unzip the grids and place
them in the same location as the matlab file.

The function information is below.

function [SWE,DOY] = dfhill_swe_calculator(Y,M,D,H,LAT,LON)

%This function implements a power law regression in order to produce a
%value of snow water equivalent (SWE) based on various parameters
%associated with a snow depth measurement. The input variables can be
%scalars (single measurement) or vectors (batch measurements). The
%following information on units, etc., is critical.

%David Hill, Oregon State University
%June 2019

%SWE (output) - snow water equivalent (mm)
%H - snow depth (mm)
%Y - year
%M - month (1 --> 12)
%D - day (1 --> 31 (or 28, or 30, as appropriate))
%LAT - latitude. Positive for N. Hem.
%LON - longitude (signed). So, -120 or so for North America.
%DOY - day of water year (Oct 1 is the origin, i.e. DOY=1)

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