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census-map-downloader

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Easily download U.S. census maps

// repository documentation

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# census-map-downloader

Easily download U.S. census maps

## Installation

```bash
pipenv install census-map-downloader
```

## Command line usage

```
Usage: censusmapdownloader [OPTIONS] COMMAND [ARGS]...

Easily download U.S. census maps

Options:
  --data-dir TEXT  The folder where you want to download the data
  --year INTEGER   The vintage of data to download. By default it gets the
                   latest year. Not all data are available for every year.

--help           Show this message and exit.

Commands:
  blocks                   Download blocks
  congress-carto           Download cartographic congressional districts
  counties                 Download counties
  counties-carto           Download cartographic counties
  countysubdivision        Download cartographic county subdivisions
  legislative-lower-carto  Download cartographic state legislative...
  legislative-upper-carto  Download cartographic state legislative...
  places                   Download places
  states-carto             Download cartographic states
  tracts                   Download tracts
  zctas                    Download ZCTAs
```

## Examples

Here's an example of downloading all counties

```bash
censusmapdownloader counties
```

You can specify the download directory with --data-dir

```bash
censusmapdownloader --data-dir ./my-special-folder/ counties
```

## Contributing

Install dependencies for development

```bash
pipenv install --dev
```

Run tests

```bash
pipenv run python test.py
```

### Adding additional years to a dataset

Downloader classes for different geography types are defined in modules of {code}`census_map_downloader.geotypes`. For example, the downloader for counties is {code}`census_map_downloader.geotypes.counties.CountiesDownloader`.

If the URL and fields in a shapefile are the same as those for years that are already supported, you can just add the year to the {code}`YEAR_LIST` attribute.

If the fields are the same, but the URL changes between groups of years, add logic to the {code}`url` property method of the downloader classes to alter the URL based on {code}`self.year`.

If the fields and URL change from year to year, consider creating classes for each year and delegating to {code}`census_map_downloader.geotypes.tracts.TractsDownloader` is an example of a class that uses this approach.

## Developing the CLI

The command-line interface is implemented using Click and setuptools. To install it locally for development inside your virtual environment, run the following installation command, as [prescribed by the Click documentation](https://click.palletsprojects.com/en/7.x/setuptools/#setuptools-integration).

```bash
pipenv run pip install --editable .
```

## Links

* Issues: [github.com/datadesk/census-map-downloader/issues](https://github.com/datadesk/census-map-downloader/issues)
* Packaging: [pypi.python.org/pypi/census-map-downloader](https://pypi.python.org/pypi/census-map-downloader)
* Testing: [github.com/datadesk/census-map-downloader/actions](https://github.com/datadesk/census-map-downloader/actions)

census-map-downloader

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