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bcdata-0.7.4
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مشاهده بیشترتوضیحات
Python tools for quick access to DataBC geo-data available via WFS
| ویژگی | مقدار |
|---|---|
| سیستم عامل | OS Independent |
| نام فایل | bcdata-0.7.4 |
| نام | bcdata |
| نسخه کتابخانه | 0.7.4 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Simon Norris |
| ایمیل نویسنده | snorris@hillcrestgeo.ca |
| آدرس صفحه اصلی | https://github.com/smnorris/bcdata |
| آدرس اینترنتی | https://pypi.org/project/bcdata/ |
| مجوز | Apache |
# bcdata
Python and command line tools for quick access to DataBC geo-data available via WFS/WCS.
There is a [wealth of British Columbia geographic information available as open
data](https://catalogue.data.gov.bc.ca/dataset?download_audience=Public),
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 PostGIS and Python GIS tools like `geopandas`, `fiona` and `rasterio`.
**Disclaimer**
*It is the user's responsibility to check the licensing for any downloads, data are generally licensed as [OGL-BC](http://www2.gov.bc.ca/gov/content/governments/about-the-bc-government/databc/open-data/open-government-license-bc)*
## Installation
### pip
$ pip install bcdata
### conda
`bcdata` has several dependencies that may not easily be installed via `pip` (`gdal`, `fiona`, `geopandas`, `rasterio`)
Installing via `miniconda`, the [conda package manager](https://conda.io/en/latest/miniconda.html) is recommended on Windows or if you do not wish to install these dependencies yourself. Once `conda` is installed, download the provided `environment.yml` file to your system, open the `Anaconda Prompt` command line from the start menu, navigate to the folder where you saved `environment.yml` and create/actvate the environment.
conda env create -f environment.yml
conda activate bcdataenv
### Configuration
#### Default PostgreSQL database
The default target database connection (used by `bc2pg`) can be set via the `DATABASE_URL` environment variable (the password parameter should not be required if using a [.pgpass file](https://www.postgresql.org/docs/current/libpq-pgpass.html))
Linux/Mac: `export DATABASE_URL=postgresql://{username}:{password}@{hostname}:{port}/{database}`
Windows: `SET DATABASE_URL=postgresql://{username}:{password}@{hostname}:{port}/{database}`
#### Layer list cache file
A list of DataBC layers is cached to file to speed request validation. The cache is automatically refreshed if it is more than a day old.
The cache file location defaults to `~/.bcdata`, but can be configured by setting the a `$BCDATA_CACHE` environment variable.
`export BCDATA_CACHE=/path/to/bcdata_cache`
## Usage
Typical usage will involve a manual search of the [DataBC Catalogue](https://catalogue.data.gov.bc.ca/dataset?download_audience=Public) 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]( https://catalogue.data.gov.bc.ca/dataset/bc-airports), either of these keys will work:
- id/package name: `bc-airports`
- object name: `WHSE_IMAGERY_AND_BASE_MAPS.GSR_AIRPORTS_SVW`
Note that some packages [may have more than one layer](https://catalogue.data.gov.bc.ca/dataset/forest-development-units) - if you request a package like this, `bcdata` will prompt you with a list of valid object/table names to use instead of the package name.
### Python module
```python
import bcdata
# get a feature as geojson
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', ...
# optionally, load data as a geopandas GeoDataFrame
gdf = bcdata.get_data(
'bc-airports',
query="AIRPORT_NAME='Terrace (Northwest Regional) Airport'",
as_gdf=True
)
gdf.head()
AERODROME_STATUS AIRCRAFT_ACCESS_IND AIRPORT_NAME ... TC_LID_CODE WEBSITE_URL geometry
0 Certified Y Terrace (Northwest Regional) Airport ... None None POINT (-128.5783333 54.46861111)
```
### CLI
Commands available via the bcdata command line interface are documented with the `--help` option:
```
$ bcdata --help
Usage: bcdata [OPTIONS] COMMAND [ARGS]...
Options:
--version Show the version and exit.
--help Show this message and exit.
Commands:
bc2pg Download a DataBC WFS layer to postgres
cat Write DataBC features to stdout as GeoJSON feature objects.
dem Dump BC DEM to TIFF
dump Write DataBC features to stdout as GeoJSON feature collection.
info Print basic metadata about a DataBC WFS layer as JSON.
list List DataBC layers available via WFS
```
#### bc2pg
```
$ bcdata bc2pg --help
Usage: bcdata bc2pg [OPTIONS] DATASET
Download a DataBC WFS layer to postgres
$ bcdata bc2pg bc-airports --db_url postgresql://postgres:postgres@localhost:5432/postgis
Options:
-db, --db_url TEXT Target database url, defaults to $DATABASE_URL
environment variable if set
--table TEXT Destination table name
--schema TEXT Destination schema name
--query TEXT A valid CQL or ECQL query
-c, --count INTEGER Total number of features to load
-p, --pagesize INTEGER Maximum request size
-k, --primary_key TEXT Primary key of dataset
-s, --schema_only Dump only the object definitions (schema), not data
-a, --append Append to existing table
-t, --no_timestamp Do not add download timestamp to bcdata meta table
-v, --verbose Increase verbosity.
-q, --quiet Decrease verbosity.
--help Show this message and exit.
```
#### cat
```
$ bcdata cat --help
Usage: bcdata cat [OPTIONS] DATASET
Write DataBC features to stdout as GeoJSON feature objects.
Options:
--query TEXT A valid CQL or ECQL query
--bounds TEXT Bounds: "left bottom right top" or "[left,
bottom, right, top]". Coordinates are BC
Albers (default) or --bounds_crs
--indent INTEGER Indentation level for JSON output
--compact / --not-compact Use compact separators (',', ':').
--dst-crs, --dst_crs TEXT Destination CRS
-p, --pagesize INTEGER Maximum request size
-s, --sortby TEXT Name of sort field
--bounds-crs, --bounds_crs TEXT
CRS of provided bounds
-w, --max_workers INTEGER Max number of concurrent requests
-v, --verbose Increase verbosity.
-q, --quiet Decrease verbosity.
--help Show this message and exit.
```
#### dem
```
$ bcdata dem --help
Usage: bcdata dem [OPTIONS]
Dump BC DEM to TIFF
Options:
-o, --out_file TEXT Output file
--bounds TEXT Bounds: "left bottom right top" or "[left,
bottom, right, top]". Coordinates are BC
Albers (default) or --bounds_crs [required]
--dst-crs, --dst_crs TEXT Destination CRS
--bounds-crs, --bounds_crs TEXT
CRS of provided bounds
-r, --resolution INTEGER
-a, --align Align provided bounds to provincial standard
-i, --interpolation [nearest|bilinear|bicubic]
-v, --verbose Increase verbosity.
-q, --quiet Decrease verbosity.
--help Show this message and exit.
```
#### dump
```
$ bcdata dump --help
Usage: bcdata dump [OPTIONS] DATASET
Write DataBC features to stdout as GeoJSON feature collection.
$ 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
It can also be combined to read bounds of a feature dataset using Fiona:
$ bcdata dump bc-airports --bounds $(fio info aoi.shp --bounds)
Options:
--query TEXT A valid CQL or ECQL query
-o, --out_file TEXT Output file
--bounds TEXT Bounds: "left bottom right top" or "[left,
bottom, right, top]". Coordinates are BC
Albers (default) or --bounds_crs
--bounds-crs, --bounds_crs TEXT
CRS of provided bounds
-v, --verbose Increase verbosity.
-q, --quiet Decrease verbosity.
--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.
Options:
--indent INTEGER Indentation level for JSON output
--count Print the count of features.
--name Print the table name of the dateset.
-v, --verbose Increase verbosity.
-q, --quiet Decrease verbosity.
--help Show this message and exit.
```
#### list
```
$ bcdata list --help
Usage: bcdata list [OPTIONS]
List DataBC layers available via WFS
Options:
-r, --refresh Refresh the cached list
--help Show this message and exit.
```
#### CLI notes
Note that `bc2pg` creates `public.bcdata` as a meta table tracking the most recent download date for each layer downloaded.
Disable with the switch `--no_timestamp` if you do not wish to create this table or do not have access to `public` schema.
Example of a record in `public.bcdata`:
```
mydb=# select * from bcdata;
table_name | date_downloaded
---------------------------------------------+-------------------------------
whse_imagery_and_base_maps.gsr_airports_svw | 2021-02-17 11:50:34.044481-08
```
#### CLI examples
Search the data listing for airports:
$ bcdata list | grep AIRPORTS
WHSE_IMAGERY_AND_BASE_MAPS.GSR_AIRPORTS_SVW
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
{
"name": "WHSE_IMAGERY_AND_BASE_MAPS.GSR_AIRPORTS_SVW",
"count": 455,
"schema": {
"properties": {
"CUSTODIAN_ORG_DESCRIPTION": "string",
"BUSINESS_CATEGORY_CLASS": "string",
"BUSINESS_CATEGORY_DESCRIPTION": "string",
"OCCUPANT_TYPE_DESCRIPTION": "string",
...etc...
},
"geometry": "GeometryCollection",
"geometry_column": "SHAPE"
}
}
The JSON output can be manipulated with [jq](https://stedolan.github.io/jq/). For example, to show only the fields available in the dataset:
$ bcdata info bc-airports | jq '.schema.properties'
{
"CUSTODIAN_ORG_DESCRIPTION": "string",
"BUSINESS_CATEGORY_CLASS": "string",
"BUSINESS_CATEGORY_DESCRIPTION": "string",
"OCCUPANT_TYPE_DESCRIPTION": "string",
etc...
}
Dump data to geojson ([`EPSG:4326` only](https://tools.ietf.org/html/rfc7946#section-4)):
$ bcdata dump bc-airports > bc-airports.geojson
Get a single feature and send it to geojsonio (requires [geojson-cli](https://github.com/mapbox/geojsonio-cli)). Note the double quotes required around a CQL FILTER provided to the `--query` option.
$ bcdata dump \
WHSE_IMAGERY_AND_BASE_MAPS.GSR_AIRPORTS_SVW \
--query "AIRPORT_NAME='Terrace (Northwest Regional) Airport'" \
| geojsonio
Save a layer to a geopackage in BC Albers:
$ bcdata cat bc-airports --dst-crs EPSG:3005 \
| fio collect \
| fio load -f GPKG --dst-crs EPSG:3005 airports.gpkg
Load data to postgres and run a spatial query:
$ bcdata bc2pg bc-airports \
--db_url postgresql://postgres:postgres@localhost:5432/postgis
$ bcdata bc2pg WHSE_LEGAL_ADMIN_BOUNDARIES.ABMS_MUNICIPALITIES_SP \
--db_url postgresql://postgres:postgres@localhost:5432/postgis
$ psql -c \
"SELECT airport_name
FROM whse_imagery_and_base_maps.gsr_airports_svw a
INNER JOIN whse_legal_admin_boundaries.abms_municipalities_sp m
ON ST_Intersects(a.geom, m.geom)
WHERE admin_area_name LIKE '%Victoria%'"
airport_name
------------------------------------------------------------------
Victoria Harbour (Camel Point) Heliport
Victoria Inner Harbour Airport (Victoria Harbour Water Airport)
Victoria Harbour (Shoal Point) Heliport
(3 rows)
## Projections / CRS
**CLI**
`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
`bc2pg` tests require database `postgresql://postgres@localhost:5432/test_bcdata` exists and has PostGIS installed:
psql -c "create database test_bcdata"
psql test_bcdata -c "create extension postgis"
Create virtualenv and install `bcdata` in development mode:
$ mkdir bcdata_env
$ virtualenv bcdata_env
$ source bcdata_env/bin/activate
(bcdata_env)$ git clone git@github.com:smnorris/bcdata.git
(bcdata_env)$ cd bcdata
(bcdata_env)$ pip install -e .[test]
(bcdata_env)$ py.test
## Other implementations
- [bcdata R package](https://github.com/bcgov/bcdata)
- [OWSLib](https://github.com/geopython/OWSLib) has basic WFS capabilities
- [pgsql-ogr-fdw](https://github.com/pramsey/pgsql-ogr-fdw) - read WFS data with postgres foreign data wrapper
- GDAL / curl / wget:
# list all layers
# querying the endpoint this way doesn't seem to work with `VERSION=2.0.0`
ogrinfo WFS:http://openmaps.gov.bc.ca/geo/ows?VERSION=1.1.0
# define a request url for airports
airports_url="https://openmaps.gov.bc.ca/geo/pub/WHSE_IMAGERY_AND_BASE_MAPS.GSR_AIRPORTS_SVW/wfs?service=WFS&version=2.0.0&request=GetFeature&typeName=WHSE_IMAGERY_AND_BASE_MAPS.GSR_AIRPORTS_SVW&outputFormat=json&SRSNAME=epsg%3A3005"
# describe airports
ogrinfo -so $airports_url OGRGeoJSON
# dump airports to geojson
ogr2ogr \
-f GeoJSON \
airports.geojson \
$airports_url
# 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 \
$airports_url
# Try requesting a larger dataset - ungulate winter range
uwr_url="https://openmaps.gov.bc.ca/geo/pub/WHSE_WILDLIFE_MANAGEMENT.WCP_UNGULATE_WINTER_RANGE_SP/wfs?service=WFS&version=2.0.0&request=GetFeature&typeName=WHSE_WILDLIFE_MANAGEMENT.WCP_UNGULATE_WINTER_RANGE_SP&outputFormat=json&SRSNAME=epsg%3A3005"
# The request only returns the first 10,000 records
ogr2ogr \
uwr.shp \
-dsco OGR_WFS_PAGING_ALLOWED=ON \
$uwr_url
# wget works too, but still only 10k records
wget -O uwr.geojson $uwr_url
نیازمندی
| مقدار | نام |
|---|---|
| - | requests |
| - | owslib |
| - | psycopg2 |
| - | sqlalchemy |
| - | geoalchemy2 |
| >=8.0 | click |
| >=0.5 | cligj |
| >=1.0 | rasterio |
| >=0.9.0 | geopandas |
| >=3 | pytest |
نحوه نصب
نصب پکیج whl bcdata-0.7.4:
pip install bcdata-0.7.4.whl
نصب پکیج tar.gz bcdata-0.7.4:
pip install bcdata-0.7.4.tar.gz