ExactExtract

exactextract is a library for extracting and summarizing the values in the portion of a raster dataset that is covered by a polygon, often referred to as zonal statistics. The goals of exactextract are to be: • fast - the https://isciences.github.io/exactextract/background.html#algorithm used by exactextract outperforms many other implementations by avoiding point-in-polygon tests used to determine whether pixels are inside or outside the raster. • accurate - exactextract computes the fraction of each pixel that is covered by a polygon to determine if the pixel should be used and/or to weigh computations using this coverage fraction. • scalable - exactextract avoids the need to load polygon or raster datasets into memory at a single time, allowing it to be used on arbitrarily large datasets with fixed system resources. • convenient - exactextract provides efficient implementations of many common summary functions and allows the user to define their own functions in R or Python. The library is developed in C++, with bindings for Python and R. It also includes a command-line interface.