ogr2ogr enables spatial file conversion and reprojection of spatial data through the use of ogr2ogr (gdal) tool
ogr2ogr requires the command line tool ogr2ogr - gdal install page. It is recommended to use the latest version.
npm install ogr2ogr
ogr2ogr takes either a path, a stream, or a GeoJSON object. The result of the transformation can be consumed via callback or stream:
var ogr2ogr =var ogr =ogrvar ogr2 =ogr2
/examples for usage examples and
The goal is for ogr2ogr to support most (if not all) formats your underlying ogr2ogr supports. You can see the progress of that in
It also will:
- Extract zip files for formats that are typically bundled (i.e. shapefiles, kmz, s57, vrt, etc)
- Will extract geometry from CSVs when a common geometry field can be determined.
- Cleans up after its messes.
- Bundles multi-file conversions as a zip
- Support GeoJSON and GeoRSS urls as path inputs
- Support raw GeoJSON objects as input
ogr2ogr takes chainable modifier functions:
var shapefile =shapefile
Available options include:
.project(dest, src)- reproject data (defaults to: "ESPG:4326")
.format(fmt)- set output format (defaults to: "GeoJSON")
.timeout(ms)- milliseconds before ogr2ogr is killed (defaults to: 15000)
.skipfailures()- skip failures (continue after failure, skipping failed feature -- by default failures are not skipped)
.options(arr)- array of custom org2ogr arguments (e.g.
.destination(str)- ogr2ogr destination (directly tell ogr2ogr where the output should go, useful for writing to databases)
.onStderr(callback)- execute a callback function whose parameter is the debug output of ogr2ogr to stderr
Example of onStderr usage
If you want to debug what is the ogr2ogr binary doing internally, you can attach a callback to the output, provided you have passed the option CPL_DEBUG
var shapefile =options"--config" "CPL_DEBUG" "ON"shapefile
You will see in the console someting in the likes of
GDAL: GDALOpen succeeds as ESRI Shapefile.GDAL: GDALDriver::CreatePGDump: LaunderName -> 'id'PGDump: LaunderName -> 'fipsstco'PGDump: LaunderName -> 'state'PGDump: LaunderName -> 'county'GDALVectorTranslate: 1 features written in layer 'sample'Shape: 1 features read on layer 'sample'.GDAL: GDALCloseGDAL: GDALClose
This can be useful when something goes wrong and the error provided by this library doesn't provide enough information.
It is trivial to handle the conversion of ESRI Shapefiles when they are packed in a zipfile that contains (at least) the
This library is also capable of converting uncompresses ESRI Shapefiles if you use the
shp file as the input file
and the shx file is in the same folder.
However, it is also possible to convert single
shp files that lack an
shx file by forcing its creation
using ogr2ogr option SHAPE_RESTORE_SHX provided you have installed
GDAL/OGR version 2.1.0 or newer.
var geojson =options"--config" "SHAPE_RESTORE_SHX" "TRUE"geojson
Caveat: ogr2ogr will do its best to infer the corresponding
shx. However, there's no guarantee it will success.
(The MIT License)
Copyright (c) 2017 Marc Harter email@example.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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