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| r.in.gdal(1) | GRASS GIS User's Manual | r.in.gdal(1) |
NAME
r.in.gdal - Imports raster data into a GRASS raster map using GDAL library.
KEYWORDS
raster, import, create project
SYNOPSIS
r.in.gdal
r.in.gdal --help
r.in.gdal [-ojeflakcrp] input=name
output=name [band=integer[,integer,...]]
[memory=memory in MB] [target=name]
[title=phrase] [offset=integer]
[num_digits=integer] [map_names_file=name]
[project=name] [table=file]
[gdal_config=string] [gdal_doo=string]
[--overwrite] [--help] [--verbose] [--quiet]
[--ui]
Flags:
- -o
-
Override projection check (use current project’s CRS)
Assume that the dataset has the same coordinate reference system as the current project - -j
-
Perform projection check only and exit - -e
-
Extend region extents based on new dataset
Also updates the default region if in the PERMANENT mapset - -f
-
List supported formats and exit - -l
-
Force Lat/Lon maps to fit into geographic coordinates (90N,S; 180E,W) - -a
-
Auto-adjustment for lat/lon
Attempt to fix small precision errors in resolution and extents - -k
-
Keep band numbers instead of using band color names - -c
-
Create the project specified by the "project" parameter and exit. Do not import the raster file. - -r
-
Limit import to the current region - -p
-
Print number of bands and exit - --overwrite
-
Allow output files to overwrite existing files - --help
-
Print usage summary - --verbose
-
Verbose module output - --quiet
-
Quiet module output - --ui
-
Force launching GUI dialog
Parameters:
- input=name [required]
-
Name of raster file to be imported - output=name [required]
-
Name for output raster map - band=integer[,integer,...]
-
Band(s) to select (default is all bands) - memory=memory in MB
-
Maximum memory to be used (in MB)
Cache size for raster rows
Default: 300 - target=name
-
Name of GCPs target project (location)
Name of project to create or to read CRS from for GCPs transformation - title=phrase
-
Title for resultant raster map - offset=integer
-
Offset to be added to band numbers
If 0, no offset is added and the first band is 1
Default: 0 - num_digits=integer
-
Zero-padding of band number by filling with leading zeros up to given number
If 0, length will be adjusted to ’offset’ number without leading zeros
Default: 0 - map_names_file=name
-
Name of the output file that contains the imported map names - project=name
-
Name for new project (location) to create - table=file
-
File prefix for raster attribute tables
The band number and ".csv" will be appended to the file prefix - gdal_config=string
-
GDAL configuration options
Comma-separated list of key=value pairs - gdal_doo=string
-
GDAL dataset open options
Comma-separated list of key=value pairs
DESCRIPTION
r.in.gdal allows a user to create a GRASS GIS raster map layer, or imagery group, from any GDAL supported raster map format, with an optional title. The imported file may also be used to create a new project (previously called location).
GDAL supported raster formats
Full details on all GDAL supported formats are available at:
https://gdal.org/en/stable/drivers/raster/
Selected formats out of the more than 140 supported formats:
Long Format Name Code Creation Georeferencing Maximum file size ---------------------------------------------+-------------+----------+--------------+----------------- ADRG/ARC Digitilized Raster Graphics ADRG Yes Yes -- Arc/Info ASCII Grid AAIGrid Yes Yes 2GB Arc/Info Binary Grid (.adf) AIG No Yes -- Arc/Info Export E00 GRID E00GRID No Yes -- ArcSDE Raster SDE No Yes -- ASCII Gridded XYZ XYZ Yes Yes -- BSB Nautical Chart Format (.kap) BSB No Yes -- CEOS (Spot for instance) CEOS No No -- DB2 DB2 Yes Yes No limits DODS / OPeNDAP DODS No Yes -- EarthWatch/DigitalGlobe .TIL TIL No No -- ENVI .hdr Labelled Raster ENVI Yes Yes No limits Envisat Image Product (.n1) ESAT No No -- EOSAT FAST Format FAST No Yes -- Epsilon - Wavelet compressed images EPSILON Yes No -- Erdas 7.x .LAN and .GIS LAN No Yes 2GB ERDAS Compressed Wavelets (.ecw) ECW Yes Yes Erdas Imagine (.img) HFA Yes Yes No limits Erdas Imagine Raw EIR No Yes -- ERMapper (.ers) ERS Yes Yes ESRI .hdr Labelled EHdr Yes Yes No limits EUMETSAT Archive native (.nat) MSGN No Yes FIT FIT Yes No -- FITS (.fits) FITS Yes No -- Fuji BAS Scanner Image FujiBAS No No -- GDAL Virtual (.vrt) VRT Yes Yes -- Generic Binary (.hdr Labelled) GENBIN No No -- GeoPackage GPKG Yes Yes No limits Geospatial PDF PDF Yes Yes -- GMT Compatible netCDF GMT Yes Yes 2GB Golden Software Surfer 7 Binary Grid GS7BG Yes Yes 4GiB Graphics Interchange Format (.gif) GIF Yes No 2GB GRASS Raster Format GRASS No Yes -- GSat File Format GFF No No -- Hierarchical Data Format Release 4 (HDF4) HDF4 Yes Yes 2GiB Hierarchical Data Format Release 5 (HDF5) HDF5 No Yes 2GiB Idrisi Raster RST Yes Yes No limits ILWIS Raster Map (.mpr,.mpl) ILWIS Yes Yes -- Image Display and Analysis (WinDisp) IDA Yes Yes 2GB In Memory Raster MEM Yes Yes Intergraph Raster INGR Yes Yes 2GiB IRIS IRIS No Yes -- Japanese DEM (.mem) JDEM No Yes -- JAXA PALSAR Product Reader (Level 1.1/1.5) JAXAPALSAR No No -- JPEG2000 (.jp2, .j2k) JP2OpenJPEG Yes Yes JPEG JFIF (.jpg) JPEG Yes Yes 4GiB KMLSUPEROVERLAY KMLSUPEROVERLAY Yes Yes MBTiles MBTiles Yes Yes -- Meta Raster Format MRF Yes Yes -- Meteosat Second Generation MSG No Yes MG4 Encoded Lidar MG4Lidar No Yes -- Microsoft Windows Device Independent Bitmap BMP Yes Yes 4GiB Military Elevation Data (.dt0, .dt1, .dt2) DTED Yes Yes -- Multi-resolution Seamless Image Database MrSID No Yes -- NASA Planetary Data System PDS No Yes -- NetCDF netCDF Yes Yes 2GB Netpbm (.ppm,.pgm) PNM Yes No No limits NITF NITF Yes Yes 10GB NLAPS Data Format NDF No Yes No limits NOAA NGS Geoid Height Grids NGSGEOID No Yes NOAA Polar Orbiter Level 1b Data Set (AVHRR) L1B No Yes -- OGC Web Coverage Service WCS No Yes -- OGC Web Map Service, and TMS, WorldWind, On EaWMS No Yes -- OGC Web Map Tile Service WMTS No Yes -- OGDI Bridge OGDI No Yes -- Oracle Spatial GeoRaster GEORASTER Yes Yes No limits OziExplorer .MAP MAP No Yes -- OZI OZF2/OZFX3 OZI No Yes -- PCI Geomatics Database File PCIDSK Yes Yes No limits PCRaster PCRaster Yes Yes Planet Labs Mosaics API PLMosaic No Yes -- Portable Network Graphics (.png) PNG Yes No PostGIS Raster (previously WKTRaster) PostGISRaster No Yes -- RadarSat2 XML (product.xml) RS2 No Yes 4GB Rasdaman RASDAMAN No No No limits Rasterlite - Rasters in SQLite DB Rasterlite Yes Yes -- Raster Product Format/RPF (CADRG, CIB) RPFTOC No Yes -- R Object Data Store R Yes No -- ROI_PAC Raster ROI_PAC Yes Yes -- R Raster (.grd) RRASTER No Yes -- SAGA GIS Binary format SAGA Yes Yes -- SAR CEOS SAR_CEOS No Yes -- Sentinel 1 SAR SAFE (manifest.safe) SAFE No Yes No limits Sentinel 2 SENTINEL2 No Yes No limits SGI Image Format SGI Yes Yes -- SRTM HGT Format SRTMHGT Yes Yes -- TerraSAR-X Complex SAR Data Product COSAR No No -- TerraSAR-X Product TSX Yes No -- TIFF / BigTIFF / GeoTIFF (.tif) GTiff Yes Yes 4GiB/None for BigTIFF USGS ASCII DEM / CDED (.dem) USGSDEM Yes Yes -- USGS Astrogeology ISIS cube (Version 3) ISIS3 No Yes -- USGS SDTS DEM (*CATD.DDF) SDTS No Yes -- Vexcel MFF MFF Yes Yes No limits VICAR VICAR No Yes -- VTP Binary Terrain Format (.bt) BT Yes Yes -- WEBP WEBP Yes No -- WMO GRIB1/GRIB2 (.grb) GRIB No Yes 2GB
Project Creation
r.in.gdal attempts to preserve coordinate reference system (CRS) information when importing datasets if the source format includes CRS information, and if the GDAL driver supports it. If the CRS of the source dataset does not match the CRS of the current project r.in.gdal will report an error message (Coordinate reference system of dataset does not appear to match current project) and then report the PROJ_INFO parameters of the source dataset.
If the user wishes to ignore the difference between the apparent coordinate system of the source data and the current project, they may pass the -o flag to override the CRS check.
If the user wishes to import the data with the full CRS definition, it is possible to have r.in.gdal automatically create a new project based on the CRS and extents of the file being read. This is accomplished by passing the name to be used for the new project via the project parameter. Upon completion of the command, a new project will have been created (with only a PERMANENT mapset), and the raster will have been imported with the indicated output name into the PERMANENT mapset.
Support for Ground Control Points
In case the image contains Ground Control Points (GCP) they are written to a POINTS file within an imagery group. They can directly be used for i.rectify.
The target option allows you to automatically re-project the GCPs from their own CRS into another CRS read from the PROJ_INFO file of the project name target.
If the target project does not exist, a new project will be created matching the CRS definition of the GCPs. The target of the output group will be set to the new project, and i.rectify can now be used without any further preparation.
Some satellite images (e.g. NOAA/AVHRR, ENVISAT) can contain hundreds or thousands of GCPs. In these cases thin plate spline coordinate transformation is recommended, either before import with gdalwarp -tps or after import with i.rectify -t.
Map names: Management of offset and leading zeros
The offset parameter allows adding an offset to band number(s) which is convenient in case of the import of e.g. a continuous time series split across different input files.
The num_digits parameter allows defining the number of leading zeros (zero padding) in case of band numbers (e.g., to turn band.1 into band.001).
NOTES
Import of large files can be significantly faster when setting memory to the size of the input file.
The r.in.gdal command does support the following features, as long as the underlying format driver supports it:
- Color Table
-
Bands with associated colortables will have the color tables transferred. Note that if the source has no colormap, r.in.gdal in GRASS 5.0 will emit no colormap. Use r.colors map=... color=grey to assign a greyscale colormap. In a future version of GRASS r.in.gdal will likely be upgraded to automatically emit greyscale colormaps.
- Data Types
-
Most GDAL data types are supported. Float32 and Float64 type bands are translated as GRASS floating point cells (but not double precision ... this could be added if needed), and most other types are translated as GRASS integer cells. This includes 16bit integer data sources. Complex (some SAR signal data formats) data bands are translated to two floating point cell layers (*.real and *.imaginary).
- Georeferencing
-
If the dataset has affine georeferencing information, this will be used to set the north, south, east and west edges. Rotational coefficients will be ignored, resulting in incorrect positioning for rotated datasets.
- Coordinate reference system
-
The dataset’s CRS will be used to compare to the current project or to define a new project. Internally GDAL represents CRS in OpenGIS Well Known Text format. A large subset of the total set of GRASS CRSs are supported.
- Null Values
-
Raster bands for which a null value is recognised by GDAL will have the null pixels transformed into GRASS style nulls during import. Many generic formats (and formats poorly supported by GDAL) do not have a way of recognising null pixels in which case r.null should be used after the import.
- GCPs
-
Datasets that have Ground Control Points will have them imported as a POINTS file associated with the imagery group. Datasets with only one band that would otherwise have been translated as a simple raster map will also have an associated imagery group if there are ground control points. The coordinate system of the ground control points is reported by r.in.gdal but not preserved. It is up to the user to ensure that the project established with i.target has a compatible coordinate system before using the points with i.rectify.
- Raster Attribute Tables
-
r.in.gdal can write out raster attribute tables as CSV files. Moreover, information in raster attribute tables is automatically imported as long as the field definitions contain information about how to use a field, e.g. for color information or for labels.
Planned improvements to r.in.gdal in the future include support for reporting everything known about a dataset if the output parameter is not set.
Error Messages
"ERROR: Input map is rotated - cannot import."
In this case the image must be first externally rotated, applying the rotation
info stored in the metadata field of the raster image file. For example, the
gdalwarp software can be used to transform the map to North-up (note, there
are several gdalwarp parameters to select the resampling algorithm):
gdalwarp rotated.tif northup.tif
"ERROR: Coordinate reference system of dataset does not
appear to match the current project."
You need to create a project whose CRS matches the data you wish to import.
Try using project parameter to create a new project based upon the
CRS information in the file. If desired, you can then reproject it to
another project with r.proj. Alternatively you can override this
error by using the -o flag.
"WARNING: G_set_window(): Illegal latitude for
North"
Latitude/Longitude projects in GRASS can not have regions which exceed
90° North or South. Non-georeferenced imagery will have coordinates
based on the images’s number of pixels: 0,0 in the bottom left;
cols,rows in the top right. Typically imagery will be much more than 90
pixels tall and so the GIS refuses to import it. If you are sure that the
data is appropriate for your Lat/Lon project and intend to reset the
map’s bounds with the r.region module directly after import
you may use the -l flag to constrain the map coordinates to legal
values. While the resulting bounds and resolution will likely be wrong for
your map the map’s data will be unaltered and safe. After resetting
to known bounds with r.region you should double check them with
r.info, paying special attention to the map resolution. In most cases
you will want to import into the datafile’s native CRS, or into a
simple XY project and use the Georectifaction tools (i.rectify et
al.) to re-project into the target project. The -l flag should
only be used if you know the CRS is correct but the internal
georeferencing has gotten lost, and you know the what the map’s
bounds and resolution should be beforehand.
EXAMPLES
ECAD Data
The European Climate Assessment and Dataset (ECAD) project provides climate data for Europe ranging from 1950 - 2015 or later. To import the different chunks of data provided by the project as netCDF files, the offset parameter can be used to properly assign numbers to the series of daily raster maps from 1st Jan 1950 (in case of importing the ECAD data split into multi-annual chunks). The ECAD data must be imported into a LatLong project.
By using the num_digits parameter leading zeros are added
to the map name numbers, allowing for chronological numbering of the
imported raster map layers, so that g.list lists them in the correct
order. Here, use num_digits=5 to have a 5 digit suffix with leading
zeros (00001 - 99999).
# Import of ECAD data split into chunks # Import precipitation data r.in.gdal -o input=rr_0.25deg_reg_1950-1964_v12.0.nc output=precipitation num_digits=5 offset=0 r.in.gdal -o input=rr_0.25deg_reg_1965-1979_v12.0.nc output=precipitation num_digits=5 offset=5479 r.in.gdal -o input=rr_0.25deg_reg_1980-1994_v12.0.nc output=precipitation num_digits=5 offset=10957 r.in.gdal -o input=rr_0.25deg_reg_1995-2015_v12.0.nc output=precipitation num_digits=5 offset=16436 # Import air pressure data r.in.gdal -o input=pp_0.25deg_reg_1950-1964_v12.0.nc output=air_pressure num_digits=5 offset=0 r.in.gdal -o input=pp_0.25deg_reg_1965-1979_v12.0.nc output=air_pressure num_digits=5 offset=5479 r.in.gdal -o input=pp_0.25deg_reg_1980-1994_v12.0.nc output=air_pressure num_digits=5 offset=10957 r.in.gdal -o input=pp_0.25deg_reg_1995-2015_v12.0.nc output=air_pressure num_digits=5 offset=16436 # Import min temperature data r.in.gdal -o input=tn_0.25deg_reg_1950-1964_v12.0.nc output=temperatur_min num_digits=5 offset=0 r.in.gdal -o input=tn_0.25deg_reg_1965-1979_v12.0.nc output=temperatur_min num_digits=5 offset=5479 r.in.gdal -o input=tn_0.25deg_reg_1980-1994_v12.0.nc output=temperatur_min num_digits=5 offset=10957 r.in.gdal -o input=tn_0.25deg_reg_1995-2015_v12.0.nc output=temperatur_min num_digits=5 offset=16436 # Import max temperature data r.in.gdal -o input=tx_0.25deg_reg_1950-1964_v12.0.nc output=temperatur_max num_digits=5 offset=0 r.in.gdal -o input=tx_0.25deg_reg_1965-1979_v12.0.nc output=temperatur_max num_digits=5 offset=5479 r.in.gdal -o input=tx_0.25deg_reg_1980-1994_v12.0.nc output=temperatur_max num_digits=5 offset=10957 r.in.gdal -o input=tx_0.25deg_reg_1995-2015_v12.0.nc output=temperatur_max num_digits=5 offset=16436 # Import mean temperature data r.in.gdal -o input=tg_0.25deg_reg_1950-1964_v12.0.nc output=temperatur_mean num_digits=5 offset=0 r.in.gdal -o input=tg_0.25deg_reg_1965-1979_v12.0.nc output=temperatur_mean num_digits=5 offset=5479 r.in.gdal -o input=tg_0.25deg_reg_1980-1994_v12.0.nc output=temperatur_mean num_digits=5 offset=10957 r.in.gdal -o input=tg_0.25deg_reg_1995-2015_v12.0.nc output=temperatur_mean num_digits=5 offset=16436
GTOPO30 DEM
To avoid the GTOPO30 data being read incorrectly, you can add a new line "PIXELTYPE SIGNEDINT" in the .HDR to force interpretation of the file as signed rather than unsigned integers. Then the .DEM file can be imported. Finally, e.g. the ’terrain’ color table can be assigned to the imported map with r.colors.
GLOBE DEM
To import GLOBE DEM tiles (approx 1km resolution, better than GTOPO30 DEM data), the user has to download additionally the related HDR file(s). Finally, e.g. the ’terrain’ color table can be assigned to the imported map with r.colors. See also their DEM portal.
Raster file import over network
Since GDAL 2.x it is possible to import raster data over the
network (see GDAL Virtual File Systems) including Cloud Optimized GeoTIFF,
i.e. access uncompressed and compressed raster data via a http(s) or ftp
connection. As an example the import of the global SRTMGL1 V003 tiles at 1
arc second (about 30 meters) resolution, void-filled:
r.in.gdal /vsicurl/https://www.datenatlas.de/geodata/public/srtmgl1/srtmgl1.003.tif output=srtmgl1_v003_30m memory=2000 g.region raster=srtmgl1_v003_30m -p r.colors srtmgl1_v003_30m color=srtm_plus
HDF
The import of HDF bands requires the specification of the
individual bands as seen by GDAL:
# Example MODIS FPAR gdalinfo MOD15A2.A2003153.h18v04.004.2003171141042.hdf ... Subdatasets:
SUBDATASET_1_NAME=HDF4_EOS:EOS_GRID:"MOD15A2.A2003153.h18v04.004.2003171141042.hdf":MOD_Grid_MOD15A2:Fpar_1km
SUBDATASET_1_DESC=[1200x1200] Fpar_1km MOD_Grid_MOD15A2 (8-bit unsigned integer)
SUBDATASET_2_NAME=HDF4_EOS:EOS_GRID:"MOD15A2.A2003153.h18v04.004.2003171141042.hdf":MOD_Grid_MOD15A2:Lai_1km
SUBDATASET_2_DESC=[1200x1200] Lai_1km MOD_Grid_MOD15A2 (8-bit unsigned integer) ... # import of first band, here FPAR 1km: r.in.gdal HDF4_EOS:EOS_GRID:"MOD15A2.A2003153.h18v04.004.2003171141042.hdf":MOD_Grid_MOD15A2:Fpar_1km \
out=fpar_1km_2003_06_02 # ... likewise for other HDF bands in the file.
REFERENCES
GDAL Pages: https://gdal.org
SEE ALSO
r.colors, r.import, r.in.ascii, r.in.bin, r.null, t.register
GRASS GIS Wiki page: Import of Global datasets
AUTHOR
Frank Warmerdam (email).
SOURCE CODE
Available at: r.in.gdal source code (history)
Latest change: Tuesday Dec 17 20:17:20 2024 in commit: d962e90c026708a4815ea2b9f46c0e84c17de22d
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