make_california_UCIPM_station_list

<p>Makes a list of the weather stations contained in the UC IPM database, with
geographic coordinates. This requires parsing through quite a few websites,
because the coordinates don't seem to be stored in one central (and easily
accessible) place. Hence this is much slower than one might expect. A
shortcut is the california_stations dataset supplied with chillR, which
contains the result of running this function in February 2016. The default
in the other relevant functions will be the use of this pre-stored list, but
if the current station coverage is needed, this function can help. Having
said this, station coverage probably won't change very rapidly, so in most
cases, the california_stations dataset should be enough.</p>

utilities

The phenology of plants (i.e. the timing of their annual life
phases) depends on climatic cues. For temperate trees and many other plants,
spring phases, such as leaf emergence and flowering, have been found to result
from the effects of both cool (chilling) conditions and heat. Fruit tree
scientists (pomologists) have developed some metrics to quantify chilling
and heat (e.g. see Luedeling (2012) <doi:10.1016/j.scienta.2012.07.011>).
'chillR' contains functions for processing temperature records into
chilling (Chilling Hours, Utah Chill Units and Chill Portions) and heat units
(Growing Degree Hours). Regarding chilling metrics, Chill Portions are often
considered the most promising, but they are difficult to calculate. This package
makes it easy. 'chillR' also contains procedures for conducting a PLS analysis
relating phenological dates (e.g. bloom dates) to either mean temperatures or
mean chill and heat accumulation rates, based on long-term weather and phenology
records (Luedeling and Gassner (2012) <doi:10.1016/j.agrformet.2011.10.020>).
As of version 0.65, it also includes functions for generating weather
scenarios with a weather generator, for conducting climate change analyses
for temperature-based climatic metrics and for plotting results from such
analyses. Since version 0.70, 'chillR' contains a function for interpolating
hourly temperature records.

Eike Luedeling

chillR

Statistical Methods for Phenology Analysis in Temperate Fruit
Trees

Lars Caspersen

Eduardo Fernandez

make_california_UCIPM_station_list function

Author

Makes a list of the UC IPM weather stations — make_california_UCIPM_station_list

Makes a list of the UC IPM weather stations

make_california_UCIPM_station_list: Makes a list of the UC IPM weather stations

Description

Usage

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Author

References

Examples