In Node:
var shapefile = require("shapefile");
shapefile.open("example.shp")
.then(source => source.read()
.then(function log(result) {
if (result.done) return;
console.log(result.value);
return source.read().then(log);
}))
.catch(error => console.error(error.stack));In a browser:
<!DOCTYPE html>
<script src="https://unpkg.com/[email protected]"></script>
<script>
shapefile.open("https://cdn.rawgit.com/mbostock/shapefile/master/test/points.shp")
.then(source => source.read()
.then(function log(result) {
if (result.done) return;
console.log(result.value);
return source.read().then(log);
}))
.catch(error => console.error(error.stack));
</script>In a terminal:
shp2json example.shp
For a live example, see bl.ocks.org/2dd741099154a4da55a7db31fd96a892. See also ndjson-cli for examples of manipulating GeoJSON using newline-delimited JSON streams.
This parser implementation is based on the ESRI Shapefile Technical Description and dBASE Table File Format. Caveat emptor: this is a work in progress and does not currently support all shapefile geometry types. It only supports dBASE III and has little error checking. Please contribute if you want to help!
In-browser parsing of dBASE table files requires TextDecoder, part of the Encoding living standard, which is not supported in IE or Safari as of September, 2016. See text-encoding for a browser polyfill.
# shapefile.open(shp[, dbf[, options]]) <>
Returns a promise that yields an open shapefile source.
If typeof shp is “string”, opens the shapefile at the specified shp path. If shp does not have a “.shp” extension, it is implicitly added. If shp instanceof ArrayBuffer or shp instanceof Uint8Array, reads the specified in-memory shapefile. Otherwise, shp must be a Node readable stream in Node or a WhatWG standard readable stream in browsers.
If typeof dbf is “string”, opens the dBASE file at the specified dbf path. If dbf does not have a “.dbf” extension, it is implicitly added. If dbf instanceof ArrayBuffer or dbf instanceof Uint8Array, reads the specified in-memory dBASE file. If dbf is undefined and shp is a string, then dbf defaults to shp with the “.shp” extension replaced with “.dbf”; in this case, no error is thrown if there is no dBASE file at the resulting implied dbf. If dbf is undefined and shp is not a string, or if dbf is null, then no dBASE file is read, and the resulting GeoJSON features will have empty properties. Otherwise, dbf must be a Node readable stream in Node or a WhatWG standard readable stream in browsers.
If typeof shp or dbf is “string”, in Node, the files are read from the file system; in browsers, the files are read using streaming fetch, if available, and falling back to XMLHttpRequest. See path-source for more.
The follwing options are supported:
encoding- the dBASE character encoding; defaults to “windows-1252”highWaterMark- in Node, the size of the stream’s internal buffer; defaults to 65536
# shapefile.read(shp[, dbf[, options]]) <>
Returns a promise that yields a GeoJSON feature collection for specified shapefile shp and dBASE table file dbf. The meaning of the arguments is the same as shapefile.open. This is a convenience API for reading an entire shapefile in one go; use this method if you don’t mind putting the whole shapefile in memory. The yielded collection has a bbox property representing the bounding box of all records in this shapefile. The bounding box is specified as [xmin, ymin, xmax, ymax], where x and y represent longitude and latitude in spherical coordinates.
# source.bbox
The shapefile’s bounding box [xmin, ymin, xmax, ymax], where x and y represent longitude and latitude in spherical coordinates.
Returns a Promise for the next record from the underlying stream. The yielded result is an object with the following properties:
value- a GeoJSON feature, or undefined if the stream endeddone- a boolean which is true if the stream ended
Returns a Promise which is resolved when the underlying stream has been destroyed.
# shp2json [options…] [file]
Converts the specified shapefile file to a GeoJSON. If file is not specified, defaults to reading from stdin (with no dBASE file). For example, to convert to a feature collection:
shp2json example.shp
To convert to a geometry collection:
shp2json -g example.shp
To convert to newline-delimited features:
shp2json -n example.shp
To convert to newline-delimited geometries:
shp2json -ng example.shp
When --geometry or --ignore-properties is not used, the shapefile is joined to the dBASE table file (.dbf) file corresonding to the specified shapefile file, if any.
# shp2json -h
# shp2json --help
Output usage information.
# shp2json -V
# shp2json --version
Output the version number.
# shp2json -o file
# shp2json --out file
Specify the output file name. Defaults to “-” for stdout.
# shp2json -n
# shp2json --newline-delimited
Output newline-delimited JSON, with one feature or geometry per line.
# shp2json -g
# shp2json --geometry
Output a geometry collection instead of a feature collection or, in conjuction with --newline-delimited, geometry objects instead of feature objects. Implies --ignore-properties.
# shp2json --ignore-properties
Ignore the corresponding dBASE table file (.dbf), if any. Output features will have an empty properties object.
# shp2json --encoding encoding
Specify the dBASE table file character encoding. Defaults to “windows-1252”.
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