In joshualerickson/exploreRGEE: Explores Google Earth Engine

Intro

The band() function is a way to get time series from an imageCollection by using the Earth Engine function toBands() and {rgee} ee_extract(). It allows the user to reduce by time (temporal) and space (zonal stats fun). To use the band() we'll need to provide a imageCollection and from there we can get a time series. This is similar to rr() except we can now bring in the time component with the temporal argument. We'll go over a few examples below. Of note, this can be an expensive function depending on the size of query so take that into account when using and try using lazy = TRUE if expensive.

Use get

First we'll need to get an image that we'll want to reduce on. We'll use the get_landsat() function, which will let us get an imageCollection. We'll need to define a geometry aka area of interest (aoi) so that we can clip the imageCollection. To do this we'll use the {mapedit}.

library(mapedit)
aoi <- drawFeatures()

From here we can start with the get_landsat() function and get an imageCollection. What's nice about using the get_*() functions is you will provide the time frame you are looking to analyze but if you don't use the get*() no worries! Just enter them into the arguments of the band() function.

get_ld8 <- get_landsat(aoi = aoi,
                     method = 'ld8',
                     startDate = '2018-01-01',
                     endDate = '2020-12-31',
                     cloud_mask = TRUE,
                     c.low = 6,
                     c.high = 10)