tutorials/metadata.md

# Working with the Metadata
The metadata files are in parquet format, and contain the following attributes:
- `id`: A unique identifier for the image.
- `url`: The URL of the image.
- `s3_key`: The S3 file key of the image.
- `caption`: A caption for the image.
- `md5_hash`: The MD5 hash of the image file.
- `mime_type`: The MIME type of the image file.
- `width`: The width of the image in pixels.
- `height`: The height of the image in pixels.
- `license_type`: The URL of the license.

#### Open a metadata file
The files are in parquet format, and can be opened with a tool like `pandas` in Python. 
```python
import pandas as pd
df = pd.read_parquet('pd15m-metadata.001.parquet')
```

#### Get URLs from metadata 
Once you have opened a maetadata file with pandas, you can get the URLs of the images with the following command:
```python
urls = df['url']
```

#### Get S3 File Keys from metadata 
You can also get the S3 file keys, which can be used to download the images using the S3 CLI:
```python
s3_keys = df['s3_key']
```