geometamaker 0.3.0

metadata creation for geospatial data

Introduction

GeoMetaMaker is a Python library for creating human and machine-readable metadata for geospatial, tabular, and other data formats.

Supported datatypes include:

• everything supported by GDAL
• tabular formats supported by frictionless
• compressed formats supported by frictionless

Installation

mamba install -c conda-forge geometamaker

Basic Usage

This library comes with a command-line interface (CLI) called geometamaker. Many of the examples below show how to use the Python interface, and then how to do the same thing, if possible, using the CLI.

Creating & adding metadata to file:

Python

import geometamaker

# For a vector:
data_path = 'data/watershed_gura.shp'
vector_resource = geometamaker.describe(data_path)

vector_resource.set_title('My Dataset')
vector_resource.set_description('all about my dataset')
vector_resource.set_keywords(['hydrology', 'watersheds'])

vector_resource.set_field_description(
    'field_name',  # the name of an actual field in the vector's table
    description='something about the field',
    units='mm')
vector_resource.write()

# For a raster:
data_path = 'data/dem.tif'
raster_resource = geometamaker.describe(data_path)
raster_resource.set_band_description(
    1,  # a raster band index, starting at 1
    description='something about the band',
    units='mm')
raster_resource.write()

# For a CSV:
data_path = 'data/table.csv'
table_resource = geometamaker.describe(data_path)
table_resource.set_field_description(
    'field_name',  # the name of an actual field in the table
    description='something about the field',
    units='mm')
# A table does not have inherent spatial information, but the
# property may be set manually:
table_resource.set_spatial(raster_resource.spatial)
table_resource.write()

For a complete list of methods and attributes: https://geometamaker.readthedocs.io/en/latest/index.html

CLI

geometamaker describe data/watershed_gura.shp

The CLI does not provide options for setting metadata properties such as keywords, field or band descriptions, or other properties that require user-input. If you create a metadata document with the CLI, you may wish to add these values manually by editing the watershed_gura.shp.yml file in a text editor.

Creating metadata for a collection of files:

Users can create a single metadata document to describe a directory of files, with the option of excluding some files using a regular expression, or limiting the number of subdirectory levels to traverse using the depth or -d flag.

Python

import geometamaker

collection_path = 'data/invest-sample-data'
metadata = geometamaker.describe_collection(collection_path,
                                            depth=2,
                                            exclude_regex=r'.*\.json$',
                                            describe_files=True)
metadata.write()

CLI

geometamaker describe -d 2 --exclude .*\.json$ data/invest-sample-data

These examples will create data/invest-sample-data/invest-sample-data-metadata.yml as well as create individual .yml documents for each dataset within the directory.

Override the default filename of the collection's YML document

geometamaker.describe_collection(collection_path, target_filename='README.yml')

or

geometamaker describe data/invest-sample-data -o README.yml

These examples will create data/invest-sample-data/README.yml.

Validating a metadata document:

If you have manually edited a .yml metadata document, it is a good idea to validate it for correct syntax, properties, and types.

Python

import geometamaker

document_path = 'data/watershed_gura.shp.yml'
error = geometamaker.validate(document_path)
print(error)

CLI

geometamaker validate data/watershed_gura.shp.yml

Validating all metadata documents in a directory:

Python

import geometamaker

directory_path = 'data/'
yaml_files, messages = geometamaker.validate_dir(data)
for filepath, msg in zip(yaml_files, messages):
    print(f'{filepath}: {msg}')

CLI

geometamaker validate data

Configuring default values for metadata properties:

Users can create a "profile" that will apply some common properties to all datasets they describe. Profiles can include contact information and/or license information.

A profile can be saved to a configuration file so that it will be re-used everytime you use geometamaker.

Python

import geometamaker
from geometamaker import models

contact = {
    'individual_name': 'bob'
}
license = {
    'title': 'CC-BY-4'
}

# Two different ways for setting profile attributes:
profile = models.Profile(contact=contact)  # keyword arguments
profile.set_license(**license)             # `set_*` methods

config = geometamaker.Config()
config.save(profile)

# The saved profile will automatically be applied during `describe`:
resource = geometamaker.describe('data/watershed_gura.shp')

CLI

geometamaker config

This will prompt the user to enter their profile information.
Also see geometamaker config --help.