ags-stream
v2.1.0
Published
Stream features from an ArcGIS Server instance
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Readme
ags-stream
ags-stream creates a readable stream of GeoJSON Features from an ArcGIS Server instance. This can be useful for scraping records from any ArcGIS Server or any other ETL process.
ags-stream is currently used in fulcrum-ags-import to import ArcGIS Server records into Fulcrum and ags-shapefile to export shapefiles from ArcGIS Server instances.
Installation
npm install ags-stream
Usage
var AgsStream = require('ags-stream');
var agsStream = new AgsStream(<service_url>, <options>?)
agsStream.on('data', function (data) {
// data is an array of GeoJSON features
data.forEach(function (feature) {
doWhatever(feature); // Add the feature to you database, write to file, whatever
});
});
agsStream.on('error', function (error) {
console.log('Oh boy, this happened: ', error);
});
agsStream.on('end', function () {
console.log('All done.'); // There is no more data to read.
});
The service_url
parameter represents a single layer in an ArcGIS Server map service. It should look something like http://gis-web.co.union.nc.us/arcgis/rest/services/PWGIS_Web/Operational_Layers/MapServer/5
.
options
is optional and accepts the following:
Option | Description | Default
------ | ----------- | -------
chunkSize
| The number of features to fetch per request to the AGS instance | 50
where
| The where clause for querying the service layer | '1=1' (all features)
outSR
| The srid for the returned geometry | 4326 (lat, lng)
qs
| An object of query strings to append to the url. These will be url encoded automatically. | null