# ogr2ogr

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##### ogr2ogr

R wrapper for ogr2ogr: converts simple features data between file formats

##### Usage
ogr2ogr(src_datasource_name, dst_datasource_name, layer, f, append, overwrite,
update, select, progress, sql, dialect, where, skipfailures, spat, spat_srs,
geomfield, dsco, lco, nln, nlt, dim, a_srs, t_srs, s_srs, preserve_fid, fid,
oo, doo, gt, ds_transaction, clipsrc, clipsrcsql, clipsrclayer, clipsrcwhere,
clipdst, clipdstsql, clipdstlayer, clipdstwhere, wrapdateline, datelineoffset,
simplify, segmentize, fieldTypeToString, mapFieldType, unsetFieldWidth,
splitlistfields, maxsubfields, explodecollections, zfield, gcp, order, tps,
unsetFid, nomd, mo, ignore.full_scan = TRUE, verbose = FALSE)
##### Arguments
src_datasource_name

Character. Input vector file.

dst_datasource_name

Character. Output vector file.

layer

Character. Layer to use.

f

Character. output file format name (default is ESRI Shapefile), some possible values are: "ESRI Shapefile", "TIGER", "MapInfo File", "GML", "PostgreSQL"

append

Logical. Append to existing layer instead of creating new

overwrite

Logical. Delete the output layer and recreate it empty.

update

Logical. Open existing output datasource in update mode rather than trying to create a new one

select

Character. Comma-delimited list of fields from input layer to copy to the new layer. A field is skipped if mentioned previously in the list even if the input layer has duplicate field names. (Defaults to all; any field is skipped if a subsequent field with same name is found.) Starting with OGR 2.0, geometry fields can also be specified in the list.

progress

Logical. (starting with GDAL 1.7.0) Display progress on terminal. Only works if input layers have the "fast feature count" capability.

sql

Character. SQL statement to execute. The resulting table/layer will be saved to the output.

dialect

Character. SQL dialect. In some cases can be used to use (unoptimized) OGR SQL instead of the native SQL of an RDBMS by passing OGRSQL. Starting with GDAL 1.10, the "SQLITE" dialect can also be used with any datasource.

where

Character. Attribute query (like SQL WHERE).

skipfailures

Logical. Continue after a failure, skipping the failed feature.

spat

Numeric. c(xmin,ymin,xmax,ymax) spatial query extents. Only features whose geometry intersects the extents will be selected. The geometries will not be clipped unless -clipsrc is specified

spat_srs

Character. srs_def. (OGR >= 2.0) Override spatial filter SRS.

geomfield

Character. (OGR >= 1.11) Name of the geometry field on which the spatial filter operates on.

dsco

Character. Dataset creation option (format specific).

lco

Character. Layer creation option (format specific).

nln

Character. Assign an alternate name to the new layer.

nlt

Character. Define the geometry type for the created layer. One of NONE, GEOMETRY, POINT, LINESTRING, POLYGON, GEOMETRYCOLLECTION, MULTIPOINT, MULTIPOLYGON or MULTILINESTRING. Add "25D" to the name to get 2.5D versions. Starting with GDAL 1.10, PROMOTE_TO_MULTI can be used to automatically promote layers that mix polygon or multipolygons to multipolygons, and layers that mix linestrings or multilinestrings to multilinestrings. Can be usefull when converting shapefiles to PostGIS (and other target drivers) that implements strict checks for geometry type.

dim

Numeric. (starting with GDAL 1.10) Force the coordinate dimension to val (valid values are 2 or 3). This affects both the layer geometry type, and feature geometries. Starting with GDAL 2.0, the value can be set to "layer_dim" to instruct feature geometries to be promoted to the coordinate dimension declared by the layer.

a_srs

Character. Assign an output SRS.

t_srs

Character. Reproject/transform to this SRS on output.

s_srs

Character. Override source SRS.

preserve_fid

Logical. Use the FID of the source features instead of letting the output driver to automatically assign a new one.

fid

Character. If provided, only the feature with this feature id will be reported. Operates exclusive of the spatial or attribute queries. Note: if you want to select several features based on their feature id, you can also use the fact the 'fid' is a special field recognized by OGR SQL. So, '-where "fid in (1,3,5)"' would select features 1, 3 and 5.

oo

Character. "NAME=VALUE". (starting with GDAL 2.0) Input dataset open option (format specific).

doo

Character. "NAME=VALUE". (starting with GDAL 2.0) Destination dataset open option (format specific), only valid in -update mode.

gt

Numeric. group n features per transaction (default 200). Increase the value for better performance when writing into DBMS drivers that have transaction support.

ds_transaction

Logical. (starting with GDAL 2.0) Force the use of a dataset level transaction (for drivers that support such mechanism), especially for drivers such as FileGDB that only support dataset level transaction in emulation mode.

clipsrc

Character. [xmin ymin xmax ymax]|WKT|datasource|spat_extent: (starting with GDAL 1.7.0) clip geometries to the specified bounding box (expressed in source SRS), WKT geometry (POLYGON or MULTIPOLYGON), from a datasource or to the spatial extent of the -spat option if you use the spat_extent keyword. When specifying a datasource, you will generally want to use it in combination of the -clipsrclayer, -clipsrcwhere or -clipsrcsql options

clipsrcsql

Character. Select desired geometries using an SQL query instead.

clipsrclayer

Character. Select the named layer from the source clip datasource.

clipsrcwhere

Character. Restrict desired geometries based on attribute query.

clipdst

Character. (starting with GDAL 1.7.0) clip geometries after reprojection to the specified bounding box (expressed in dest SRS), WKT geometry (POLYGON or MULTIPOLYGON) or from a datasource. When specifying a datasource, you will generally want to use it in combination of the -clipdstlayer, -clipdstwhere or -clipdstsql options

clipdstsql

Character. Select desired geometries using an SQL query instead.

clipdstlayer

Character. Select the named layer from the destination clip datasource.

clipdstwhere

Character. Restrict desired geometries based on attribute query.

wrapdateline

Logical. (starting with GDAL 1.7.0) split geometries crossing the dateline meridian (long. = +/- 180deg).

datelineoffset

Logical. (starting with GDAL 1.10) offset from dateline in degrees (default long. = +/- 10deg, geometries within 170deg to -170deg will be splited)

simplify

Numeric. (starting with GDAL 1.9.0) distance tolerance for simplification. Note: the algorithm used preserves topology per feature, in particular for polygon geometries, but not for a whole layer.

segmentize

Numeric. (starting with GDAL 1.6.0) maximum distance between 2 nodes. Used to create intermediate points

fieldTypeToString

Character. (starting with GDAL 1.7.0) converts any field of the specified type to a field of type string in the destination layer. Valid types are : Integer, Real, String, Date, Time, DateTime, Binary, IntegerList, RealList, StringList. Special value All can be used to convert all fields to strings. This is an alternate way to using the CAST operator of OGR SQL, that may avoid typing a long SQL query.

mapFieldType

Character. srctype|All=dsttype,... (starting with GDAL 2.0) converts any field of the specified type to another type. Valid types are : Integer, Integer64, Real, String, Date, Time, DateTime, Binary, IntegerList, Integer64List, RealList, StringList. Types can also include subtype between parenthesis, such as Integer(Boolean), Real(Float32), ... Special value All can be used to convert all fields to another type. This is an alternate way to using the CAST operator of OGR SQL, that may avoid typing a long SQL query. This is a generalization of -fieldTypeToString. Note that this does not influence the field types used by the source driver, and is only an afterwards conversion.

unsetFieldWidth

Logical. (starting with GDAL 2.0) set field width and precision to 0.

splitlistfields

Logical. (starting with GDAL 1.8.0) split fields of type StringList, RealList or IntegerList into as many fields of type String, Real or Integer as necessary.

maxsubfields

Numeric. To be combined with -splitlistfields to limit the number of subfields created for each split field.

explodecollections

Logical. (starting with GDAL 1.8.0) produce one feature for each geometry in any kind of geometry collection in the source file.

zfield

Character. (starting with GDAL 1.8.0) Uses the specified field to fill the Z coordinate of geometries.

gcp

Numeric. c(ungeoref_x,ungeoref_y,georef_x georef_y,elevation) (starting with GDAL 1.10.0) Add the indicated ground control point. This option may be provided multiple times to provide a set of GCPs.

order

Numeric. (starting with GDAL 1.10.0) order of polynomial used for warping (1 to 3). The default is to select a polynomial order based on the number of GCPs.

tps

Logical. (starting with GDAL 1.10.0) Force use of thin plate spline transformer based on available GCPs.

fieldmap

Character. (starting with GDAL 1.10.0) Specifies the list of field indexes to be copied from the source to the destination. The (n)th value specified in the list is the index of the field in the target layer definition in which the n(th) field of the source layer must be copied. Index count starts at zero. There must be exactly as many values in the list as the count of the fields in the source layer. We can use the 'identity' setting to specify that the fields should be transferred by using the same order. This setting should be used along with the -append setting.

Logical. (starting with GDAL 2.0) This is a specialized version of -append. Contrary to -append, -addfields has the effect of adding, to existing target layers, the new fields found in source layers. This option is usefull when merging files that have non-strictly identical structures. This might not work for output formats that don't support adding fields to existing non-empty layers.

relaxedFieldNameMatch

Logical. (starting with GDAL 1.11) Do field name matching between source and existing target layer in a more relaxed way if the target driver has an implementation for it. [-relaxedFieldNameMatch] [-forceNullable]

forceNullable

Logical. (starting with GDAL 2.0) Do not propagate not-nullable constraints to target layer if they exist in source layer.

unsetDefault

Logical. (starting with GDAL 2.0) Do not propagate default field values to target layer if they exist in source layer.

unsetFid

Logical. (starting with GDAL 2.0) Can be specify to prevent the new default behaviour that consists in, if the output driver has a FID layer creation option and we are not in append mode, to preserve the name of the source FID column and source feature IDs.

nomd

Logical. (starting with GDAL 2.0) To disable copying of metadata from source dataset and layers into target dataset and layers, when supported by output driver.

mo

Character. "META-TAG=VALUE". (starting with GDAL 2.0) Passes a metadata key and value to set on the output dataset, when supported by output driver.

ignore.full_scan

Logical. If FALSE, perform a brute-force scan if other installs are not found. Default is TRUE.

verbose

Logical. Enable verbose execution? Default is FALSE.

##### Details

This is an R wrapper for the 'ogr2ogr' function that is part of the Geospatial Data Abstraction Library (GDAL). It follows the parameter naming conventions of the original function, with some modifications to allow for more R-like parameters. For all parameters, the user can use a single character string following, precisely, the gdalinfo format (http://gdal.org/ogrinfo.html), or, in some cases, can use R vectors to achieve the same end.

PERFORMANCE HINTS

When writing into transactional DBMS (SQLite/PostgreSQL,MySQL, etc...), it might be beneficial to increase the number of INSERT statements executed between BEGIN TRANSACTION and COMMIT TRANSACTION statements. This number is specified with the -gt option. For example, for SQLite, explicitly defining -gt 65536 ensures optimal performance while populating some table containing many hundredth thousand or million rows. However, note that if there are failed insertions, the scope of -skipfailures is a whole transaction.

For PostgreSQL, the PG_USE_COPY config option can be set to YES for significantly insertion performance boot. See the PG driver documentation page.

More generally, consult the documentation page of the input and output drivers for performance hints.

This function assumes the user has a working GDAL on their system. If the "gdalUtils_gdalPath" option has been set (usually by gdal_setInstallation), the GDAL found in that path will be used. If nothing is found, gdal_setInstallation will be executed to attempt to find a working GDAL.

character

##### References

http://www.gdal.org/ogr2ogr.html

• ogr2ogr
##### Examples
# NOT RUN {
# We'll pre-check to make sure there is a valid GDAL install.
# Note this isn't strictly neccessary, as executing the function will
# force a search for a valid GDAL install.
gdal_setInstallation()
valid_install <- !is.null(getOption("gdalUtils_gdalPath"))
if(valid_install)
{
src_datasource_name <- system.file("external/tahoe_highrez_training.shp", package="gdalUtils")
dst_datasource_name <- paste(tempfile(),".shp",sep="")
ogrinfo(src_datasource_name,"tahoe_highrez_training")
# reproject the input to mercator
ogr2ogr(src_datasource_name,dst_datasource_name,t_srs="EPSG:3395",verbose=TRUE)
ogrinfo(dirname(dst_datasource_name),layer=remove_file_extension(basename(dst_datasource_name)))
}
# }

Documentation reproduced from package gdalUtils, version 2.0.1.7, License: GPL (>= 2)

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