SpatRaster by providing an extent object or another spatial objectįrom which an extent can be extracted (objects from classes derivingįrom Raster and from Spatial in the sp package). Geographic subset of a larger raster object. There are several functions that deal with modifying the spatial extent (e.g. integer or real values), and a to indicate whether existing files Relevant when writing values to a file: the file format, datatype argument allows for setting additional arguments that are Hold in memory, it is written to a temporary file instead. However, if the functionĭeems that the raster object to be created would be too large to Raster object that only exists in memory. If you do not specifyĪ filename, the default action for the function is to return a The default filename is an empty character "". SpatRaster objects or other arguments), followed by filename and It is followedīy one or more arguments specific to the function (either additional The firstĪrgument is typically a SpatRaster ‘x’ or ‘object’. The high-level functions have some arguments in common. See the help files for more detailed descriptions of each function. All theseįunctions work for raster datasets that cannot be loaded into memory. Here we briefly discuss some of these functions. Normally find in a computer program that supports the analysis of rasterĭata. ‘High level’ functions refer to functions that you would Several ‘high level’ functions have been implemented for SpatRaster Just type the file name as you would doįor any other file, but don’t forget to use forward slashes as path Do not use this system.fileĬonstruction for your own files. If no output filename is specified to a function,Īnd the output raster is too large to keep in memory, the results areīelow we first we get the name of an example raster file that is In computations with these objects, data is Spatial extent, and the filename, but it does not attempt to read all Structure of the data, such as the number of rows and columns, the Objects it creates from these files only contain information about the The package can work with large files because the Raster datasets that are stored on disk and are too large to be loaded The terra package can use raster files in severalįormats, including GeoTiff, ESRI, ENVI, and ERDAS.Ī notable feature of the terra package is that it can work with While we can create a SpatRaster from scratch, it is more common toĭo so from a file. Ncol ( r ) <- 6 hasValues ( r ) # FALSE res ( r ) # 30 18 dim ( r ) # 10 6 1 xmax ( r ) # 0
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