Young_et_al_Data

Gridded tree mortality data based on annual aerial surveys conducted from 2009 to 2015, along with environmental variables used to explain mortality patterns. The data file contains one row per unique 3.5 km grid cell & year combination. The data frame covers all grid cells within the state of California where at least one Aerial Detection Survey (ADS) flight was taken between 2009 and 2015, so each grid cell position has between 1 and 7 years of data (reflected as 1 to 7 rows in the data file per grid cell position). The main response variables are mort.bin (presence of any mortality) and mort.tph (number of dead trees/ha reported for the given grid cell & year combination). The main predictor variables are a set of climatic and forest structure variables at the same spatial scale, as described in the primary publication. This file is an Excel workbook with two worksheets: the first worksheet describes the variables, and the second worksheet contains the data. This data file was created by compiling and processing various publicly-available data sources into a standardized grid; the R code used for this is included in this repository as "Young_et_al_Data_preparation.R". The code used for statistical analyses and plots based on this data file ("Young_et_al_Analysis.R") is included as well.