* Note : This app uses built-in magnetometer, so iPod Touch does not provides direction of structure/device.

GeoID is a professional tool for measuring and analyzing geological structures. This application includes geological compass, stereographic projection, instability analysis and wireless data sharing.

• Features
- The clinometer works with all attitude of the device and enables user to measure any structure
- A stability indicator in the clinometer maximizes its accuracy
- Provides many options including notation type, measurement interval, avarage calculation, projection type, etc.
- Can input data manually using several input methods
- Immediate projection and analysis of selected project
- Provides stereonet-based slope stability analysis
- Supports zooming while plotting/analyzing
- Wireless data transferring via Bluetooth and E-mail
- Generates analysis reports with stereonet images and sends them by e-mail
- Supports all iOS devices

Developed by Engineering Geology & GIS Lab.,
Dept. of Energy Systems Engineering,
Seoul National University, South Korea.

Prof. Hyeong Dong Park wishes to express thanks to Prof. Edward Keller and other faculty members of the Earth Sciences Department of University of California Santa Barbara for the useful suggestions and discussions on the improvement of GeoID during Prof. Park's academic visit from 2011-2013.

What’s New

Version 1.80

This app has been updated by Apple to use the latest Apple signing certificate.

iOS 8 compatibility and bug fix.

Ratings and Reviews

5.0 out of 5
2 Ratings

2 Ratings

Lib25geo ,

Best app for taking attitudes!

I've been using this app for about 2 years and it is fabulous. I don't even carry a bruton any more, and a few of the other geologists on my team have taken to it as well. I open different projects for bedding and structures, having a stereo net for each lets me see different domains develop as I map. Seeing that real time, in the field is very powerful. I haven't found any app as good as this one.

Chris Hughes 2020 ,

Great structure tool!

I think it's worth the money. Have yet to really test in field (want to do a Brunton vs smartphone test) but it worked well on some homemade structures I made. Many great options and very easy to use. Recommended for structural geologists!

What I liked:
-Lets you use your iPhone as a compass to measure strike/dip, trend/plunge by using magnetometer.
-Can enter data manually or using the magnetometer.
-Plots circles (planes), and points (lines) on a stereonet (10 or 2 degree option)
-Can compare stereonet to current plane.
-Can highlight intersections of planes on steronet.
-Many options to single out data on stereonet all quickly accessible.
-Failure Analysis
-Ability to export projects via bluetooth, email as text
-Ability to store multiple projects
-Very professional look (Looks like a tool and not a toy, if that matters to you)

What I didn't like:
-Won't export photo of stereonet (but you can always use the phone's 'Print Screen' function by simultaneously holding down "Hold" and the "Home" button. It says you can in the description, but I can't seem to find the option to send anything but a text file in either text or scv (comma separated values).
-Kind of expensive. Give us geologists a break. We need to be saving our money for beer!

Safipour ,

Great app has everything you need to collect and analyze structural data!

This app is fantastic! I love the options to plot and analyze your data on stereo nets and rose diagrams, the ability to export a text or csv file, and the option to take a photo along with a measurement. This app is really well designed and easy to use.

App Privacy

The developer, Engineering Geology & GIS Lab., SNU., has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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