Function raster in r1/4/2024 ![]() ![]() They increase within rows, from left to right, and then row by row from top to bottom. Computing row, column, cell numbers and coordinatesĬell numbers start at 1 in the upper-left corner. Get or set the NA value (for reading from a file) How many bands (layers) does the file associated with a RasterLayer object have? Layer (=band) of a multi-band file that this RasterLayer is linked to Test if an object has a longitude/latitude coordinate reference systemįilename to which a RasterLayer or RasterBrick is linked The coordinate reference system (map projection) The extent (minimum and maximum x and y coordinates) The number of cells (can not be set directly, only via ncol or nrow) Similarly, with projection you can set the projection, but this does not transform the data (see projectRaster for that). This is not the case when the extent is changed (as the number of columns and rows will not be affected). If there are values associated with a RasterLayer object (either in memory or via a link to a file) these are lost when you change the number of columns or rows or the resolution. Getting and setting Raster* dimensionsīasic parameters of existing Raster* objects can be obtained, and in most cases changed. Pairs plot for layers in a RasterStack or RasterBrickīox plot of the values of one or multiple layers X-y scatter plot of the values of two RasterLayer objects Select a geometric subset of a Raster* or Spatial* objectĬreate a SpatialPolygons object by drawing itĬreate a SpatialLines object by drawing it Query values of Raster* or Spatial* objects by clicking on a map Plot the values of a RasterLayer on top of a map Plot a Raster* with the spplot function (sp package) ![]() The main method to create a mapĬombine three layers (red, green, blue channels) into a single 'real color' image In this book, as well as in most spatial data analysis practices, we encounter two types of rasters: single-band rasters and multi-band rasters (Section 5.3.2).See the rasterVis package for additional plotting methods for Raster* objects using methods from 'lattice' and other packages. (Subsequent indices, if any, select the remaining dimensions).The 4 th index selects the third dimension (if there is one), typically band, i.e., raster layers.The 3 rd index selects the second dimension, typically, i.e., raster rows.The 2 nd index selects the first dimension, typically, i.e., raster columns.The stars subset operator [ works as follows: We can get a subset of a stars object while keeping all of its properties, using the [ operator. 12.2 Inverse Distance Weighted interpolation.11.3 Aggregation of spatio-temporal rasters.10.7.5 Extracting to polygons: multi-band.10.7.4 Extracting to polygons: single-band. ![]()
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