Automated Geospatial Feature Engineering Library
Geomancer is a geospatial feature engineering library. It leverages geospatial data such as OpenStreetMap (OSM) alongside a data warehouse like BigQuery. You can use this to create, share, and iterate geospatial features for your downstream tasks (analysis, modelling, visualization, etc.).
Geomancer can perform geospatial feature engineering for all types of vector data (i.e. points, lines, polygons).
- Feature primitives for geospatial feature engineering
- Ability to switch out data warehouses (BigQuery, SQLite, PostgreSQL (In Progress))
- Compile and share your features using our SpellBook
Setup and Installation
Installing the library
Geomancer can be installed using
$ pip install geomancer
This will install all dependencies for every data-warehouse we support. If you wish to do this only for a specific warehouse, then you can add an identifier:
$ pip install geomancer[bq] # For BigQuery $ pip install geomancer[sqlite] # For SQLite $ pip install geomancer[psql] # For PostgreSQL
Alternatively, you can also clone the repository then run
$ git clone https://github.com/thinkingmachines/geomancer.git $ cd geomancer $ python setup.py install
Setting up your data warehouse
You can see the set-up instructions in this link
All of the feature engineering functions in Geomancer are called "spells". For example, you want to get the distance to the nearest supermarket for each point.
from geomancer.spells import DistanceToNearest # Load your dataset in a pandas dataframe # df = load_dataset() dist_spell = DistanceToNearest( "supermarket", source_table="ph_osm.gis_osm_pois_free_1", feature_name="dist_supermarket", dburl="bigquery://project-name", ).cast(df)
You can specify the type of filter using the format
column value is
fclass. For example, if you wish to look for
roads on a bridge, then pass
from geomancer.spells import DistanceToNearest # Load the dataset in a pandas dataframe # df = load_dataset() dist_spell = DistanceToNearest( "bridge:T", source_table="ph_osm.gis_osm_roads_free_1", feature_name="dist_road_bridges", dburl="bigquery://project-name", ).cast(df)
Compose multiple spells into a "spell book" which you can export as a JSON file.
from geomancer.spells import DistanceToNearest from geomancer.spellbook import SpellBook spellbook = SpellBook([ DistanceToNearest( "supermarket", source_table="ph_osm.gis_osm_pois_free_1", feature_name="dist_supermarket", dburl="bigquery://project-name", ), DistanceToNearest( "embassy", source_table="ph_osm.gis_osm_pois_free_1", feature_name="dist_embassy", dburl="bigquery://project-name", ), ]) spellbook.to_json("dist_supermarket_and_embassy.json")
You can share the generated file so other people can re-use your feature extractions with their own datasets.
from geomancer.spellbook import SpellBook # Load the dataset in a pandas dataframe # df = load_dataset() spellbook = SpellBook.read_json("dist_supermarket_and_embassy.json") dist_supermarket_and_embassy = spellbook.cast(df)
This project is open for contributors! Contibutions can come in the form of feature requests, bug fixes, documentation, tutorials and the like! We highly recommend to file an Issue first before submitting a Pull Request.
Simply fork this repository and make a Pull Request! We'd definitely appreciate:
- Implementation of new features
- Bug Reports
MIT License © 2019, Thinking Machines Data Science
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