Evaluation frost-free days and related metrics from daily climate records.

Miscellaneous soil data management, summary, visualization, and conversion utilities to support soil survey.

Dylan Beaudette

sharpshootR

A Soil Survey Toolkit

Jay Skovlin

Stephen Roecker

Andrew Brown

USDA-NRCS Soil Survey Staff 

FFD function

<dl><dt>d</dt>
<dd><code>data.frame</code> with columns 'datetime' 'year', and 'value'; 'value' being daily minimum temperature, see details</dd>
<dt>returnDailyPr</dt>
<dd>optionally return <code>list</code> with daily summaries</dd>
<dt>minDays</dt>
<dd>min number of days of non-NA data in spring | fall, required for a reasonable estimate of FFD</dd>
<dt>frostTemp</dt>
<dd>critical temperature that defines "frost" (same units as <code>d$value</code>)</dd>
<dt>endSpringDOY</dt>
<dd>day of year that marks end of "spring" (typically Jan 1 -- June 30)</dd>
<dt>startFallDOY</dt>
<dd>day of year that marks start of "fall" (typically Aug 1 -- Dec 31)</dd></dl>

Arguments

Author

Frost-Free Day Evaluation — FFD

<dl>

<dt>d</dt>
<dd><code>data.frame</code> with columns 'datetime' 'year', and 'value'; 'value' being daily minimum temperature, see details</dd>


<dt>returnDailyPr</dt>
<dd>optionally return <code>list</code> with daily summaries</dd>


<dt>minDays</dt>
<dd>min number of days of non-NA data in spring | fall, required for a reasonable estimate of FFD</dd>


<dt>frostTemp</dt>
<dd>critical temperature that defines "frost" (same units as <code>d$value</code>)</dd>


<dt>endSpringDOY</dt>
<dd>day of year that marks end of "spring" (typically Jan 1 -- June 30)</dd>


<dt>startFallDOY</dt>
<dd>day of year that marks start of "fall" (typically Aug 1 -- Dec 31)</dd>

</dl>

FFD: Frost-Free Day Evaluation

Description

Usage

Value

Arguments

Author

Details

Examples