gdalraster is an interface to the Geospatial Data Abstraction
Library (GDAL) for low level raster I/O. Calling signatures resemble those
of the native C, C++ and Python APIs provided by the GDAL project.
See https://gdal.org/api/ for details of the GDAL Raster API.
GDAL is by: Frank Warmerdam, Even Rouault and others
(see https://github.com/OSGeo/gdal/graphs/contributors)
R interface/additional functionality: Chris Toney
Maintainer: Chris Toney <chris.toney at usda.gov>
Core functionality is contained in class GDALRaster and several
related stand-alone functions:
GDALRaster-class is an exposed C++ class that allows
opening a raster dataset and calling methods on the GDALDataset,
GDALDriver and GDALRasterBand objects in the underlying API
(e.g., get/set parameters, read/write pixel data).
raster creation: create(),
createCopy(),
rasterFromRaster(),
translate(),
getCreationOptions()
virtual raster: buildVRT(),
rasterToVRT()
reproject/resample/crop/mosaic: warp()
algorithms: dem_proc(),
fillNodata(),
footprint(),
polygonize(),
rasterize(),
sieveFilter(),
GDALRaster$getChecksum()
raster attribute tables: buildRAT(),
displayRAT(),
GDALRaster$getDefaultRAT(),
GDALRaster$setDefaultRAT()
geotransform conversion:
apply_geotransform(),
get_pixel_line(),
inv_geotransform()
coordinate transformation:
transform_xy(),
inv_project()
spatial reference convenience functions:
epsg_to_wkt(),
srs_to_wkt(),
srs_is_geographic(),
srs_is_projected(),
srs_is_same()
geometry convenience functions:
bbox_from_wkt(),
bbox_to_wkt(),
bbox_intersect(),
bbox_union(),
bbox_transform(),
g_area(),
g_buffer(),
g_centroid(),
g_contains(),
g_crosses(),
g_difference(),
g_disjoint(),
g_distance(),
g_equals(),
g_intersection(),
g_intersects(),
g_is_empty(),
g_is_valid(),
g_length(),
g_name(),
g_overlaps(),
g_sym_difference(),
g_touches(),
g_transform(),
g_union(),
g_within(),
geos_version()
data management: addFilesInZip(),
copyDatasetFiles(),
deleteDataset(),
renameDataset(),
bandCopyWholeRaster()
OGR vector utilities:
ogr2ogr(),
ogrinfo(),
ogr_manage,
ogr_define
virtual file systems:
VSIFile,
vsi_clear_path_options(),
vsi_copy_file(),
vsi_curl_clear_cache(),
vsi_get_disk_free_space(),
vsi_get_file_metadata(),
vsi_get_fs_options(),
vsi_get_fs_prefixes(),
vsi_mkdir(),
vsi_read_dir(),
vsi_rename(),
vsi_rmdir(),
vsi_set_path_option(),
vsi_stat(),
vsi_supports_rnd_write(),
vsi_supports_seq_write(),
vsi_sync(),
vsi_unlink(),
vsi_unlink_batch()
GDAL configuration:
gdal_version(),
gdal_formats(),
get_cache_used(),
get_config_option(),
set_config_option(),
get_num_cpus(),
get_usable_physical_ram(),
has_spatialite(),
http_enabled(),
push_error_handler(),
pop_error_handler(),
dump_open_datasets()
PROJ configuration:
proj_version(),
proj_search_paths(),
proj_networking()
Additional functionality includes:
RunningStats-class calculates mean and variance in one
pass. The min, max, sum, and count are also tracked (efficient summary
statistics on data streams).
CmbTable-class implements a hash table for counting
unique combinations of integer values.
combine() overlays multiple rasters so that a
unique ID is assigned to each unique combination of input values. Pixel
counts for each unique combination are obtained, and combination IDs are
optionally written to an output raster.
calc() evaluates an R expression for each pixel in
a raster layer or stack of layers. Individual pixel coordinates are available
as variables in the R expression, as either x/y in the raster projected
coordinate system or inverse projected longitude/latitude.
plot_raster() displays raster data using
base R graphics. Supports single-band grayscale, RGB, color tables and
color map functions (e.g., color ramp).
GDAL Raster Data Model:
https://gdal.org/user/raster_data_model.html
Raster format descriptions:
https://gdal.org/drivers/raster/index.html
Geotransform tutorial:
https://gdal.org/tutorials/geotransforms_tut.html
GDAL Virtual File Systems:
https://gdal.org/user/virtual_file_systems.html