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Python tools for quick access to DataBC geo-data available via WFS

Project description

# bcdata

Python and command line tools for quick access to DataBC geo-data available via WFS.

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There is a [wealth of British Columbia geographic information available as open
but direct file download urls are not available and the syntax to accesss WFS via `ogr2ogr` and/or `curl/wget` can be awkward.

This Python module and CLI attempts to simplify downloads of BC geographic data and smoothly integrate with existing Python GIS tools like `fiona` and `rasterio`.


- it is the user's responsibility to check the licensing for any downloads, data are generally licensed as [OGL-BC](
- this is not specifically endorsed by the Province of Britsh Columbia or DataBC
- use with care, please don't overload the service

## Installation

$ pip install bcdata

To enable autocomplete of dataset names (full object names only) with the command line tools, add this line to your `.bashrc` as per this [guide](

eval "$(_BCDATA_COMPLETE=source bcdata)"

## Usage

Typical usage will involve a manual search of the [DataBC Catalogue]( to find a layer of interest. Once a dataset of interest is found, note the key with which to retreive it. This can be either the `id`/`package name` (the last portion of the url) or the `Object Name` (Under `Object Description`).

For example, for [BC Airports](, either of these keys will work:

- id/package name: `bc-airports`

### Python module

>>> import bcdata
>>> geojson = bcdata.get_data('bc-airports', query="AIRPORT_NAME='Terrace (Northwest Regional) Airport'")
>>> geojson
{'type': 'FeatureCollection', 'features': [{'type': 'Feature', 'id': 'WHSE_IMAGERY_AND_BASE_MAPS.GSR_AIRPORTS_SVW.fid-f0cdbe4_16811fe142b_-6f34', 'geometry': {'type': 'Point', ...

### CLI

There are several commands available:

$ bcdata --help
Usage: bcdata [OPTIONS] COMMAND [ARGS]...

--help Show this message and exit.

bc2pg Replicate a DataBC table in a postgres database
dump Dump a data layer from DataBC WFS
info Print basic info about a DataBC WFS layer
list List DataBC layers available via WMS

#### `list`

$ bcdata list --help
Usage: bcdata list [OPTIONS]

List DataBC layers available via WFS

-r, --refresh Refresh the cached list
--help Show this message and exit.

#### `info`

$ bcdata info --help
Usage: bcdata info [OPTIONS] DATASET

Print basic metadata about a DataBC WFS layer as JSON.

Optionally print a single metadata item as a string.

--indent INTEGER Indentation level for JSON output
--count Print the count of features.
--name Print the datasource's name.
--help Show this message and exit.

#### `dump`

$ bcdata dump --help
Usage: bcdata dump [OPTIONS] DATASET

Dump a data layer from DataBC WFS to GeoJSON

$ bcdata dump bc-airports
$ bcdata dump bc-airports --query "AIRPORT_NAME='Victoria Harbour (Shoal Point) Heliport'"
$ bcdata dump bc-airports --bounds xmin ymin xmax ymax

The values of --bounds must be in BC Albers.

It can also be combined to read bounds of a feature dataset using Fiona:
$ bcdata dump bc-airports --bounds $(fio info aoi.shp --bounds)

--query TEXT A valid CQL or ECQL query, quote enclosed (https://docs
-o, --out_file TEXT Output file
--bounds TEXT Bounds: "left bottom right top" or "[left, bottom,
right, top]".
--help Show this message and exit.

#### `cat`

$ bcdata cat --help
Usage: bcdata cat [OPTIONS] DATASET

Download a DataBC WFS layer and write to stdout as GeoJSON feature
objects. In this case, cat does not concatenate.

--query TEXT A valid `CQL` or `ECQL` query (https://docs.geose
--indent INTEGER Indentation level for JSON output
--bounds TEXT Bounds: "left bottom right top" or "[left,
bottom, right, top]".
--compact / --not-compact Use compact separators (',', ':').
--dst-crs, --dst_crs TEXT Destination CRS.
-p, --pagesize INTEGER Max number of records to request
-s, --sortby TEXT Name of sort field
--help Show this message and exit.

#### `bc2pg`

$ bcdata bc2pg --help
Usage: bcdata bc2pg [OPTIONS] DATASET

Copy a data from DataBC WFS to postgres - a wrapper around ogr2ogr

$ bcdata bc2pg bc-airports --db_url postgresql://postgres:postgres@localhost:5432/postgis

The default target database can be specified by setting the $DATABASE_URL
environment variable.

-db, --db_url TEXT SQLAlchemy database url
--query TEXT A valid `CQL` or `ECQL` query (https://docs.geoserve
-p, --pagesize INTEGER Max number of records to request
-s, --sortby TEXT Name of sort field
--help Show this message and exit.

#### CLI examples

Search the data listing for airports:

$ bcdata list | grep AIRPORTS

Describe a dataset. Note that if we know the id of a dataset, we can use that rather than the object name:

$ bcdata info bc-airports --indent 2
"count": 455,
"schema": {
"properties": {
"geometry": "GeometryCollection",
"geometry_column": "SHAPE"

Dump data to geojson:

$ bcdata dump bc-airports > bc-airports.geojson

Get a single feature and send it to geojsonio (requires [geojson-cli]( Note the double quotes required around a CQL FILTER provided to the `--query` option.

$ bcdata dump \
--query "AIRPORT_NAME='Terrace (Northwest Regional) Airport'" \
| geojsonio

Save a layer to a geopackage in BC Albers:

$ bcdata cat bc-airports --dest_crs EPSG:3005 \
| fio collect \
| fio load --f GPKG airports.gpkg

Load a layer to postgres:

$ bcdata bc2pg \
bc-airports \
--db_url postgresql://postgres:postgres@localhost:5432/postgis

## Projections / CRS


`bcdata dump` returns GeoJSON in WGS84 (`EPSG:4326`).

`bcdata cat` provides the `--dst-crs` option, use any CRS the WFS server supports.

`bcdata bc2pg` loads data to PostgreSQL in BC Albers (`EPSG:3005`).

**Python module**

`bcdata.get_data()` defaults to `EPSG:4236` but any CRS can be specified (that the server will accept).

## Development and testing

$ mkdir bcdata_env
$ virtualenv bcdata_env
$ source bcdata_env/bin/activate
(bcdata_env)$ git clone
(bcdata_env)$ cd bcdata
(bcdata_env)$ pip install -e .[test]
(bcdata_env)$ py.test

## Other implementations
- [bcdata R package](
- [OWSLib]( has basic WFS capabilities
- GDAL / curl / wget:

# list all layers
# querying the endpoint this way doesn't seem to work with `VERSION=2.0.0`
ogrinfo WFS:

# define a request url for airports

# describe airports
ogrinfo -so $airports_url OGRGeoJSON

# dump airports to geojson
ogr2ogr \
-f GeoJSON \
airports.geojson \

# load airports to postgres
ogr2ogr \
-f PostgreSQL \
PG:"host=localhost user=postgres dbname=postgis password=postgres" \
-lco SCHEMA=whse_imagery_and_base_maps \
-lco GEOMETRY_NAME=geom \
-nln gsr_airports_svw \

# Try requesting a larger dataset - ungulate winter range

# The request only returns the first 10,000 records
ogr2ogr \
uwr.shp \

# wget works too, but still only 10k records
wget -O uwr.geojson $uwr_url

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