Package: vectra 0.14.1

vectra: Columnar Query Engine for Larger-than-RAM Data

A minimal columnar query engine with lazy execution on datasets larger than RAM. Provides 'dplyr'-like verbs (filter(), select(), mutate(), group_by(), summarise(), joins, window functions) and common aggregations (n(), sum(), mean(), min(), max(), sd(), first(), last()) backed by a pure C11 pull-based execution engine and a custom on-disk format ('.vtr'). Reads and writes 'GeoTIFF' (including tiled and 'BigTIFF' layouts) and a tiled raster format ('.vec') with overview pyramids and time cubes for larger-than-RAM raster data. Streams vector operations (spatial transforms, point-in-polygon and nearest-feature joins including a two-sided grid-partitioned join, select-by-location, clip, erase, dissolve, 'rasterization', 'polygonization', and contouring) through 'sf', and runs raster operations (zonal statistics, focal windows, terrain derivatives, resample or 'reproject' warp, polygon masking, map algebra, and 'mosaicking') in native C or over the tiled '.vec' format, one batch or tile at a time for data larger than RAM.

Authors:Gilles Colling [aut, cre, cph], Yann Collet [ctb, cph], Meta Platforms, Inc. and affiliates [cph], Rich Geldreich [ctb], Martin Raiber [ctb, cph], Alistair Moffat [ctb], Jyrki Katajainen [ctb], RAD Game Tools and Valve Software [cph], Rich Geldreich and Tenacious Software LLC [cph]