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GDAL-MDIM-CONVERT(1) |
GDAL |
GDAL-MDIM-CONVERT(1) |
gdal-mdim-convert - Convert a multidimensional dataset
Added in version 3.11.
Usage: gdal mdim convert [OPTIONS] <INPUT> <OUTPUT>
Convert a multidimensional dataset.
Positional arguments:
-i, --input <INPUT> Input raster or multidimensional raster dataset [required]
-o, --output <OUTPUT> Output multidimensional raster dataset (created by algorithm) [required]
Common Options:
-h, --help Display help message and exit
--json-usage Display usage as JSON document and exit
--config <KEY>=<VALUE> Configuration option [may be repeated]
--progress Display progress bar
Options:
-f, --of, --format, --output-format <OUTPUT-FORMAT> Output format
--co, --creation-option <KEY>=<VALUE> Creation option [may be repeated]
--overwrite Whether overwriting existing output is allowed
--array <ARRAY-SPEC> Select a single array instead of converting the whole dataset. [may be repeated]
--array-option <KEY>=<VALUE> Option passed to GDALGroup::GetMDArrayNames() to filter arrays. [may be repeated]
--group <GROUP-SPEC> Select a single group instead of converting the whole dataset. [may be repeated]
--subset <SUBSET-SPEC> Select a subset of the data. [may be repeated]
--scale-axes <SCALEAXES-SPEC> Applies a integral scale factor to one or several dimensions [may be repeated]
--strict Turn warnings into failures.
Advanced Options:
--oo, --open-option <KEY>=<VALUE> Open options [may be repeated]
--if, --input-format <INPUT-FORMAT> Input formats [may be repeated]
gdal mdim convert can be used to convert multidimensional
data between different formats.
The following options are available:
- -f, --of, --format,
--output-format <OUTPUT-FORMAT>
- Select the output format. This can be a format that supports
multidimensional output (such as NetCDF: Network Common Data Form,
Multidimensional VRT), or a "classic" 2D formats, if only
one single 2D array results of the other specified conversion operations.
When this option is not specified, the format is guessed when possible
from the extension of the destination filename.
- --co, --creation-option
<KEY>=<VALUE>
- Many formats have one or more optional creation options that can be used
to control particulars about the file created.
The creation options available vary by format driver, and some
simple formats have no creation options at all. A list of options
supported for a format can be listed with the --format command
line option but the documentation for the format is the definitive
source of information on driver creation options. See Raster
drivers format specific documentation for legal creation options for
each format.
Array-level creation options may be passed by prefixing them
with ARRAY:. See GDALGroup::CopyFrom() for further details
regarding such options.
- --overwrite
- Allow program to overwrite existing target file or dataset. Otherwise, by
default, gdal errors out if the target file or dataset already
exists.
- --array
<array_spec>
- Instead of converting the whole dataset, select one array, and possibly
perform operations on it. This option can be specified several times to
operate on different arrays.
<array_spec> may be just an array name, potentially
using a fully qualified syntax (/group/subgroup/array_name). Or it can
be a combination of options with the syntax:
name={src_array_name}[,dstname={dst_array_name}][,resample=yes][,transpose=[{axis1},{axis2},...][,view={view_expr}]
The following options are processed in that order:
- resample=yes asks for the array to run through
GDALMDArray::GetResampled().
- [{axis1},{axis2},...] is the argument of
GDALMDArray::Transpose().
- For example, transpose=[1,0] switches the axis order of a 2D array. See
Example 5.
- •
- {view_expr} is the value of the viewExpr argument of
GDALMDArray::GetView(). See Example 4.
When specifying a view_expr that performs a slicing or subsetting
on a dimension, the equivalent operation will be applied to the
corresponding indexing variable.
- --array-option
<NAME>=<VALUE>
- Option passed to GDALGroup::GetMDArrayNames() to filter reported
arrays. Such option is format specific. Consult driver documentation. This
option may be used several times.
- --group
<group_spec>
- Instead of converting the whole dataset, select one group, and possibly
perform operations on it. This option can be specified several times to
operate on different groups. If only one group is specified, its content
will be copied directly to the target root group. If several ones are
specified, they are copied under the target root group
<group_spec> may be just a group name, potentially using
a fully qualified syntax (/group/subgroup/subsubgroup_name). Or it can
be a combination of options with the syntax:
name={src_group_name}[,dstname={dst_group_name}][,recursive=no]
- --subset
<subset_spec>
- Performs a subsetting (trimming or slicing) operation along a dimension,
provided that it is indexed by a 1D variable of numeric or string data
type, and whose values are monotonically sorted. <subset_spec>
follows exactly the OGC WCS 2.0 KVP encoding for subsetting.
That is dim_name(min_val,max_val) or dim_name(sliced_val) The
first syntax will subset the dimension dim_name to values in the
[min_val,max_val] range. The second syntax will slice the dimension
dim_name to value sliced_val (and this dimension will be removed from
the arrays that reference to it)
Using --subset is incompatible with specifying a view
option in --array.
See Example 2.
- -scaleaxes
<scaleaxes_spec>
- Applies a integral scale factor to one or several dimensions, that is
extract 1 value every N values (without resampling).
<scaleaxes_spec> follows exactly the syntax of the KVP
encoding of the SCALEAXES parameter of OGC WCS 2.0 Scaling
Extension, but limited to integer scale factors.
That is
<dim1_name>(<scale_factor>)[,<dim2_name>(<scale_factor>)]...
Using --scaleaxes is incompatible with specifying a
view option in --array.
See Example 3.
- --strict
- By default, some failures during the translation are tolerated, such as
not being able to write group attributes. When setting this option, such
failures will cause the process to fail.
- --if
<format>
- Format/driver name to be attempted to open the input file(s). It is
generally not necessary to specify it, but it can be used to skip
automatic driver detection, when it fails to select the appropriate
driver. This option can be repeated several times to specify several
candidate drivers. Note that it does not force those drivers to open the
dataset. In particular, some drivers have requirements on file extensions.
May be repeated.
gdal mdim convert in.nc out.vrt
gdal mdim convert in.nc out.tif --subset "time(\"2010-01-01\")" --array temperature
gdal mdim convert in.nc out.nc --scaleaxes "X(2),Y(2)"
Reorder the values of the time,Y,X array along the Y axis from
top-to-bottom to bottom-to-top (or the reverse)
gdal mdim convert in.nc out.nc --array "name=temperature,view=[:,::-1,:]"
gdal mdim convert in.nc out.nc --array "name=temperature,transpose=[2,1,0]"
Even Rouault <even.rouault@spatialys.com>
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