Cumulative human impacts: stressor data rescaled by two time periods (2008 and 2013, scaled from 0-1)

This is a portion of the data used to calculate 2008 and 2013 cumulative human impacts in: Halpern et al. 2015. Spatial and temporal changes in cumulative human impacts on the world's ocean. Seven data packages are available for this project: (1) supplementary data (habitat data and other files); (2) raw stressor data (2008 and 2013); (3) stressor data rescaled by one time period (2008 and 2013, scaled from 0-1); (4) stressor data rescaled by two time periods (2008 and 2013, scaled from 0-1); (5) pressure and cumulative impacts data (2013, all pressures); (6) pressure and cumulative impacts data (2008 and 2013, subset of pressures updated for both time periods); (7) change in pressures and cumulative impact (2008 to 2013). All raster files are .tif format and coordinate reference system is mollweide wgs84. Here is an overview of the calculations: Raw stressor data -> rescaled stressor data (values between 0-1) -> pressure data (stressor data after adjusting for habitat/pressure vulnerability) -> cumulative impact (sum of pressure data) -> difference between 2008 and 2013 pressure and cumulative impact data. This data package includes 2008 and 2013 stressor data rescaled to have values between 0 and 1. These values were calculated for each stressor/year raster cell by first log10(x+1) transforming the data and then dividing by the highest raster cell value observed across both the 2008 and 2013 data for each stressor. There are N=15 2008 rasters (preceded by rescaled_2008_two_) and N=15 2013 rasters (preceded by rescaled_2013_two_). There is no sea level rise raster for 2008.