SODA GeoServices

Query Esri Geoservices using a SODA2-style API

This is still a work in progress. Check out the list of features and tests to get an idea for the functionality.

Why?

Geoservices are incredibly powerful but have a complex query structure as a result, and can be intimidating for new users - particularly when you want to do a basic query like a group by. This tool provides a layer of abstraction - an easy-to-use API for common queries. It is not meant to cover the breadth of functionality geoservices provide; rather just those provided by the SODA2 spec.

Examples

Using https://services.arcgis.com/fLeGjb7u4uXqeF9q/ArcGIS/rest/services

• /Storefront_Improvement_Programs/FeatureServer/0
• /Storefront_Improvement_Programs/FeatureServer/0?relations=Mayfair CDC
• [/Storefront_Improvement_Programs/FeatureServer/0?$select=funded_by, count()&$group=funded_by](http://soda-geoservices.herokuapp.com/Storefront_Improvement_Programs/FeatureServer/0?$select=funded_by, count()&$group=funded_by)
• /Storefront_Improvement_Programs/FeatureServer/0?$select=extent(geometry)
• /Storefront_Improvement_Programs/FeatureServer/0?$where=within_circle(geometry, 39.9520, -75.1646, 100)
• /Storefront_Improvement_Programs/FeatureServer/0?$where=within_box(geometry, 39.9537, -75.1577, 39.9623, -75.1422)

Usage

1. Clone this repo and install dependencies via npm install
2. Copy .env.sample to .env and fill in PROXY_TO with the path to your Geoservices (ex. http://maps2.dcgis.dc.gov/dcgis/rest/services/) and any default parameters in DEFAULT_PARAMS in a=b&c=d format
3. Run the server via npm start
4. Append the service to your URL and use SODA2 querystring parameters

For example:

http://localhost:8080/DDOT/AlleyConditions/MapServer/0?alley_material=Asphalt

Development

• Write tests first and run them via npm test
• Lint the code style via npm run lint (uses standard)

References

• GeoServices Documentation
• SODA2 Documentation
• Supported functions for ArcGIS Server (v10.2)
• Validate SQL

License

MIT