ras_calc_mean_points: Calculate mean of each raster layer for buffered points
In malinfischer/phenoTS: What the Package Does (One Line, Title Case)

Description Usage Arguments Value Examples

This function allows you to calculate the mean of all pixels within a buffer-zone around points of interest (POIs) for each layer in a raster stack. A tibble with mean values and additional columns with the provided date flags and other information is returned and can be used for forther analysis and plotting.

1	ras_calc_mean_points(ras_stack, dir_shp, buffer, date_flag)

`ras_stack`	Raster stack to analyze.
`dir_shp`	Full path to shape-file containing POIs (with file name and .shp) - e.g. created using dwd_stations_shp(). Provide unique point-IDs, column name = 'stat_id'!
`date_flag`	A vector containing the date flags of each layer, e.g. observation years, which is appended to result. Ascending numbers are assigned if empty.
`buffer_size`	Size of buffer around each point within which pixels are extracted and averaged (in meters).

A tibble with calculated mean values per station and layer plus other information and date flags.

# load processed data
ndvi_m_px_1 <- stack(".../phenoTS/example_scripts/MODIS_data_processed/ndvi_m_px_1.tif")

# mean of all pixels in layer within point-buffer (around DWD stations)

dir_shp <- ".../phenoTS/example_scripts/MODIS_data_processed/dwd_stations.shp"

# calculate mean per pixel-buffer
ndvi_m_1_poi <- ras_calc_mean_points(ndvi_m_px_1,dir_shp=dir_shp,buffer=5000,date_flag=c(2000:2018))