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About CrowdMag

CrowdMag is a tool that measures the local magnetic field using your smartphone! The app displays the data as a graph or a map in units of nanotesla (nT; one nanotesla equals 10^−9 Tesla). The local magnetic field components measured by CrowdMag are the Z (downward component), H (horizontal intensity), and F (total intensity). Use CrowdMag for measuring magnetic data during your outdoor adventures or to conduct your own homegrown science! To perform your own experiments or analyze your observations, export your data as a CSV file. Optionally, your magnetic data may be shared with NOAA to help scientists understand more about Earth’s magnetic field!

What is new!

CrowdMag is going active! When you go out for a walk, run, or other outdoor activities, use CrowdMag to measure the magnetic data along your path and save the data as a “magtivity”. Save, list, export or delete magtivities to create a complete magnetic field map of your area. We particularly encourage you to share your magtivities with our research group at NOAA and to have multiple magtivities along the same path so that we can stack the data to reduce the noise.

Getting a new phone? Don’t worry! You can now export a backup of your CrowdMag and save it on your computer. If you have to reset your phone, or switch to a new phone, you can now import your backup and continue using CrowdMag without losing your status for data contributed, areas covered, or magtivities completed.

CrowdMag’s magnetic calculator provides magnetic variation (declination), the magnetic field’s dip angle, total magnetic field and other magnetic field components (as well as their associated uncertainties) based on the latest World Magnetic Model (WMM2020).

CrowdMag Features:

- Create your own magnetic activity (magtivity)
- Customize recording frequency and location accuracy
- Interactive Google Map provides a map of your magnetic data
- Graph your data as a time series line chart
- Check the quality of the data by comparing it with the WMM
- Export your data as a CSV file
- Clear stored data on your phone
- Optionally share your data with NOAA
- See generalized crowdsourced magnetic data from other users
- Live magnetic compass
- Current solar magnetic disturbance
- Expected magnetic field calculator
- Uses the most recent magnetic field model (WMM2020)
- Export data via email, Google Drive and other options
- Export CrowdMag backup to save your contributions' status and data
- Import CrowdMag backup (works across different phone platforms)

Visit https://ngdc.noaa.gov/geomag/crowdmag.shtml to see crowdsourced magnetic data.

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Frequently Asked Questions(FAQ)

What does CrowdMag measure?

CrowdMag measures the local magnetic field using your smartphone.

What units does CrowdMag use to display the data?

CrowdMag displays the data in units of nanotesla (nT).

What are the local magnetic field components measured by CrowdMag?

The local magnetic field components measured by CrowdMag are the Z (downward component), H (horizontal intensity), and F (total intensity).

Can I export my magnetic data from CrowdMag?

Yes, you can export your magnetic data as a CSV file.

Can I share my magnetic data with NOAA?

Yes, you can optionally share your magnetic data with NOAA to help scientists understand more about Earth's magnetic field.

What is a "magtivity" in CrowdMag?

A "magtivity" is a magnetic activity that you can create and save while using CrowdMag during your outdoor activities.

Can I backup my CrowdMag data?

Yes, you can export a backup of your CrowdMag data and save it on your computer.

Can I import my CrowdMag backup to a new phone?

Yes, you can import your CrowdMag backup to a new phone and continue using CrowdMag without losing your data and progress.

What features does CrowdMag provide for analyzing magnetic data?

CrowdMag provides features such as a graphing tool for visualizing the data, checking the data quality against the World Magnetic Model (WMM), and a magnetic calculator for calculating magnetic variation and dip angle.

How can I export and share my data from CrowdMag?

You can export your data via email, Google Drive, and other options available in the app.

Where can I visit to see crowdsourced magnetic data?

You can visit https://ngdc.noaa.gov/geomag/crowdmag.shtml to see crowdsourced magnetic data.
author
Fun app. It needs to have a function to overlay readings from different dates for the same location. Also more choices of maps would be so cool! My choice would be a LiDar map and Arial would be my second ch...
Tina Shay
author
It would be cool if CrowdMag linked with MyShake extra points if it used a geo coin too
Stanley Moras
author
Excellant App
vijayraja rajan
author
Fun app!
Ericka Martin
author
Easy to use and always on point.
salvation774 N.
author
Good good good
sno