shakythesherpa / geostack-api

A quick & dirty Node/Express application to serve GeoJSON from OpenStreetMap data imports.

geostack-api

This is a quick & dirty Node/Express application that's used in conjunction with my Let's Talk About Your Geostack workshop & deck. It's the result of a basic Express scaffold, with /routes/users.js deleted, /routes/amenities.js added, and /app.js adjusted accordingly.

Requirements

The requirements for this to work are that

0. you have Node and npm installed

1. there's a spatially-enabled (PostgreSQL + PostGIS) database running on localhost

2. the database contains OpenStreetMap data, likely a metro extract

3. the data import was done with osm2pgsql and included all tags, meaning that --hstore-all was used, e.g.

   osm2pgsql -H localhost --hstore-all -d portland_from_osm ~/Downloads/portland.osm.pbf
   

Motivation

The workshop demonstrates how all components of a contemporary web mapping application can be run locally, on your own computer, using open source software and open data. OpenStreetMap data is used with TileMill and TileStream to generate and serve map tiles as a base layer, and with Leaflet to generate map overlays for points of interest.

The dynamic.html page in a companion repo, geostack-map-pages, consumes data from this api in order to create and display a Leaflet GeoJSON Layer.

Use

1. git clone this repository.

2. cd geostack-api

3. npm install

4. alter line 11 of /routes/amenities.js to account for your database name and authentication parameters. The general form is

   pg://user_name:user_password@localhost:port_number/database_name
   

5. npm start

6. visit or make an AJAX call to http://localhost:3000/amenities/ to retrieve a GeoJSON FeatureCollection of restaurants and their cuisines

{
    "type": "FeatureCollection",
    "features": [
        {
            "type": "Feature",
            "geometry": {
                "type": "Point",
                "coordinates": [
                    -123.201866018855,
                    45.2027315841557
                ]
            },
            "properties": {
                "name": "El Primo",
                "cuisine": null
            }
        },
        {
            "type": "Feature",
            "geometry": {
                "type": "Point",
                "coordinates": [
                    -123.192975122993,
                    45.2237749069396
                ]
            },
            "properties": {
                "name": "Chan's Restuarant",
                "cuisine": "chinese"
            }
        },
        {
            "type": "Feature",
            "geometry": {
                "type": "Point",
                "coordinates": [
                    -122.230128012966,
                    45.3831193176103
                ]
            },
            "properties": {
                "name": "Calamity Jane's",
                "cuisine": "burger"
            }
        }
    ]
}