GeoJSON

The missing GeoJSON utilities for OpenStreetMap

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Why this?

Because existing tools cannot solve below problems efficiently

• Building an OSM object in GeoJSON format with sub-areas separated. osmtogeojson or polygons.openstreetmap.fr won't work because they don't include inner boundaries.
• Tags and metadata normalization
• Optional D3-compatibility. It doesn't follow common convetion like winding order from GeoJSON’s RFC 7946

These above problems keep showing up and bugging me because my work is closely related. So if you share the same concerns, this tool is for you.

Accuracy and Legal Disclaimer

The accuracy of information provided by the tool solely depends on OpenStreetMap data.

I do not accept any responsibility or liability for the accuracy, content, completeness, legality, or reliability of the information provided by the tool or contained on the website.

Docs

Installation

go version >= go1.13

GO111MODULE=on go get -u github.com/hiendv/geojson/cmd/geojson

Example

List all New York sub-areas

geojson subarea 61320

2020-08-05T14:41:57.087+0700  INFO  fetching sub-areas   {"parent": 61320}
2020-08-05T14:42:06.126+0700  INFO  writing  {"path": "geojson/61320.geojson"}
2020-08-05T14:42:06.127+0700  INFO  sub-areas handled {"total": 62}

The difference with existing tools can be demonstrated with two visualization below

hiendv/geojson

polygons.openstreetmap.fr

(after manual correction and right-hand-rule fixing)

Usage

geojson --help

NAME:
   GeoJSON - Utilities for OpenStreetMap GeoJSON

USAGE:
   geojson [global options] command [command options] [arguments...]

VERSION:
   0.1.1

AUTHOR:
   Hien Dao <[email protected]>

COMMANDS:
   serve    serve the web server
   subarea  list all sub-areas of an OpenStreetMap object
   help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --out value, -o value  specify the directory of outputs (default: "./geo")
   --verbose              enable verbose logging with DEBUG level (default: false)
   --help, -h             show help (default: false)
   --version, -v          print the version (default: false)

COPYRIGHT:
   Copyright © 2020 Hien Dao. All Rights Reserved.

Notice: To print outputs to stdout, specify --out as an empty string

geojson --out "" command [command options] [arguments...]

subarea

geojson subarea --help

NAME:
   geojson subarea - list all sub-areas of an OpenStreetMap object

USAGE:
   geojson subarea [command options] [arguments...]

OPTIONS:
   --raw, -r        leave tags in unfornalized form (UNF) (default: false)
   --separated, -s  leave sub-areas unmerged (default: false)
   --rewind         rewind the output - counter to RFC 7946 (default: false)
   --help, -h       show help (default: false)

serve

geojson serve --help

NAME:
   geojson serve - serve the web server

USAGE:
   geojson serve [command options] [arguments...]

OPTIONS:
   --address value, --addr value  set the serving address (default: "127.0.0.1:8181")
   --origin value                 set the CORS origin (default: "*")
   --rate value                   set request-per-second for rate-limiting (default: 10)
   --rate-burst value             set burst size (concurrent requests) for rate-limiting (default: 5)
   --rate-ttl value               set the rate limit TTL for inactive sessions (default: "2m")
   --prefix value                 set static fs handler base path (default: "/static")
   --help, -h                     show help (default: false)

API

Rate-limiting

The rate-limiting will be specified by --rate, --rtate-burst, --rate-ttl parameters. Default values should be 10 requests/second with a concurrent value of 5 and time-to-live for inactive sessions of 2 minutes.

List sub-areas of an OpenStreetMap relation [GET /api/v1/subareas/{id}{?rewind}]

• Parameters

  • id (number, required) - ID of an OpenStreetMap relation.
  • rewind (optional) - Rewinding the requested GeoJSON

• Response 200 (application/json)

  • Attributes
    • code (number)
    • message (string)
    • data (string)

Example

GET /api/v1/subareas/61320?rewind HTTP/1.1
Host: localhost:8181
User-Agent: curl/7.68.0
Accept: */*


HTTP/1.1 200 OK
Access-Control-Allow-Headers: Content-Type
Access-Control-Allow-Origin: *
Content-Type: application/json
X-Content-Type-Options: nosniff
Date: Wed, 19 Aug 2020 16:25:13 GMT
Content-Length: 58

{"code":0,"message":"","data":"/static/geo/61320-rewind.geojson"}

GeoJSON of an OpenStreetMap relation [GET /{prefix}/{out}/{filename}.geojson]

Example

GET /static/geo/61320.geojson HTTP/1.1
Host: localhost:8181
User-Agent: curl/7.68.0
Accept: */*


HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 1298442
Content-Type: text/plain; charset=utf-8
Last-Modified: Wed, 19 Aug 2020 11:47:13 GMT
Date: Wed, 19 Aug 2020 16:37:00 GMT

{"type":"FeatureCollection","features":[{"id":"relation/962876","type":"Feature","geometry":{...}}]}

Development

Prerequisites

• go version go1.11 for modules support

Running and Building

go run cmd/geojson/main.go --help
go run cmd/geojson/main.go subarea --help
go run cmd/geojson/main.go serve --help

go build -o geojson cmd/geojson/main.go

Linting & Formatting

### Format
gofumpt -w -s ./

### Lint
golangci-lint run ./...

Testing

go test -race ./...

Contribution

Issues and PRs are welcome !

License

MIT © 2020 Hien Dao [email protected]