cardboard

cardboard

Cardboard provides the query, indexing, and storage logic for GeoJSON feature storage with CRUD on DynamoDB and S3.

install

npm install cardboard
# or globally
npm install -g cardboard

api

var c = Cardboard({
    accessKeyId: config.awsKey,
    secretAccessKey: config.awsSecret,
    sessionToken: config.sessionToken,
    table: config.DynamoDBTable,
    endpoint: 'http://localhost:4567',
    bucket: 'test',
    prefix: 'test'
});

accessKeyId, secretAccessKey, and sessionToken are optional. See Configuring the SDK in Node.js for more configuration options.

Initialize a new cardboard database connector given a config object that is sent to dyno.

c.createTable(tableName, callback);

Create a cardboard table with the specified name.

c.insert(primarykey: string, feature: object, layer: string, callback: fn);

Insert a single feature, indexing it with a primary key in a given layer.

// query a bbox, callback-return array of geojson
c.bboxQuery(bbox: array, layer: string, callback: fn);
// delete a feature
c.del(primarykey: string, layer: string, callback: fn);
c.dump(); // -> stream
c.export(); // -> stream
// get information about a dataset (feature count, size, extent)
c.getDatasetInfo(dataset: string, callback: fn);

Approach

This project aims to create a simple, fast geospatial index as a layer on top of DynamoDB. This means that the index will not be built into the database or contained in a single R-Tree - it will be baked into the indexes by which data is stored.

While the whole index in kept in DynamoDB, the larger geometries are stored on S3.

Support target:

• All GeoJSON geometry types should be storable
• BBOX queries should be supported