onc-hydrophone-data 0.2.0

Tools for downloading and processing Ocean Networks Canada hydrophone data

🌊 ONC Hydrophone Data Tools

Tools for downloading and processing Ocean Networks Canada hydrophone data, including spectrograms, FLAC audio files, and custom spectrogram generation.

📦 Installation

pip install onc-hydrophone-data

For development:

git clone https://github.com/Spiffical/onc-hydrophone-data.git
cd onc-hydrophone-data
pip install -e .

⚙️ Configuration

1. Get your ONC API token from: https://data.oceannetworks.ca/Profile

2. Create a .env file in your project directory:

ONC_TOKEN=your_onc_token_here
DATA_DIR=./data

🚀 Quick Start

📓 Tutorial Notebook - The best way to get started with interactive examples.

Python API

from onc_hydrophone_data.onc.common import load_config
from onc_hydrophone_data.data import HydrophoneDownloader
from onc_hydrophone_data.audio import SpectrogramGenerator

# Load credentials from .env file
onc_token, data_dir = load_config()

# Download spectrograms using intelligent sampling
downloader = HydrophoneDownloader(onc_token, data_dir)
downloader.download_spectrograms_with_sampling_schedule(
    deviceCode="ICLISTENHF6020",
    start_date=(2021, 1, 1),
    threshold_num=100
)

# Generate custom spectrograms from audio files
generator = SpectrogramGenerator(win_dur=2.0, overlap=0.75)
generator.process_directory("data/DEVICE/audio/", "output/spectrograms/")

Command Line

# Interactive mode (guided setup - recommended)
python scripts/download_hydrophone_data.py

# Download spectrograms with specific parameters
python scripts/download_hydrophone_data.py --mode sampling \
    --device ICLISTENHF6020 --start-date 2021 1 1 --threshold 500

# Include FLAC audio files
python scripts/download_hydrophone_data.py --mode sampling \
    --device ICLISTENHF6020 --start-date 2021 1 1 --threshold 100 --download-audio

# Generate custom spectrograms
python scripts/generate_spectrograms.py --input-dir data/DEVICE/audio/ --win-dur 2.0

✨ Features

• Smart Sampling: Intelligently distributes downloads across date ranges
• Parallel ONC Requests: Submits many requests at once so ONC processes them in parallel, then downloads when ready (faster than sequential requests)
• Audio Downloads: Download raw audio (FLAC/WAV) alongside spectrograms
• Custom Spectrograms: Generate spectrograms with configurable parameters
• Deployment Validation: Ensures data exists for requested time periods
• Interactive Mode: Guided CLI for easy setup

📁 Output Structure

Downloads are organized in a clean, flat structure:

data/
└── ICLISTENHF6020/
    └── sampling_2021-01-01_to_2021-01-31/
        ├── onc_spectrograms/     # ONC-downloaded spectrograms (MAT/PNG)
        │   ├── *.mat             # Spectrogram data files
        │   └── anomaly_report.txt # Any validation issues (if found)
        ├── audio/                # Downloaded audio files
        │   └── *.flac
        └── custom_spectrograms/  # Locally-generated spectrograms
            ├── mat/              # Custom MAT files
            └── png/              # Custom PNG plots

Note: Unlike previous versions, there are no processed/ or rejects/ subdirectories. All files stay in flat directories for simplicity.

🛠️ Troubleshooting

Issue	Solution
Invalid ONC Token	Verify token in .env file
No data found	Use --check-deployments to verify coverage
Memory errors	Reduce --spectrograms-per-batch

📚 Documentation

Docs site: https://spiffical.github.io/onc-hydrophone-data/
See the Tutorial Notebook for comprehensive examples including:

• Different download modes (sampling, range, specific times)
• Parallel download optimization
• Custom spectrogram generation
• JSON timestamp requests

📄 License

MIT License - see LICENSE for details.