# Scientific Altimeter

> Scientific Altimeter (iPhone/iPad app by Mark Chilton.)

- Source: https://appshunter.io/ios/app/scientific-altimeter/id6755533714 (this page in markdown: same URL + `.md`)
- Developer: [Mark Chilton](https://appshunter.io/developer/1854434721)
- Category: Education, Navigation
- Price: Free
- Age rating: 9+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2025-11-22
- Data updated: 2026-02-23
- User reviews in markdown: https://appshunter.io/ios/app/scientific-altimeter/id6755533714/reviews.md

## What is Scientific Altimeter?

SCIENTIFIC ALTIMETER
Nationwide One-Touch Calibration

The only iOS altimeter with nationwide one-touch calibration using USGS ground-truth elevation data. Tap once, get instant calibration anywhere in the United States. No manual entry, no guesswork.

Designed for field researchers, GIS professionals, educators, and students.

KEY FEATURES

- NATIONWIDE ONE-TOUCH CALIBRATION
Automatic USGS 3DEP calibration anywhere in the US with cellular or WiFi

- DUAL SENSOR COMPARISON
Record GPS altitude and calibrated barometric altitude with accuracy estimates

- MANUAL CALIBRATION
Enter known elevations for offline fieldwork or international use

- SMART RECALIBRATION
Time and pressure-change monitoring maintains accuracy during long field sessions

- PROFESSIONAL EXPORTS
CSV, GPX, KML, and GeoJSON formats ready for GIS analysis

- WORKS OFFLINE
GPS-only mode and manual calibration support remote fieldwork

WHY ONE-TOUCH CALIBRATION MATTERS

Other altimeter apps require manual elevation lookup from maps or uncalibrated pressure readings. Scientific Altimeter automatically queries USGS elevation at your GPS coordinates and calibrates your barometer to ground truth. One tap, instant accuracy.

SCIENTIFIC APPROACH

Barometers measure pressure changes precisely but need calibration. Weather systems cause drift. Scientific Altimeter uses USGS 3DEP data for ground-truth reference and monitors pressure changes to suggest recalibration when needed.

Full metadata in exports enables reproducible fieldwork and quality assessment.

IDEAL FOR

- Watershed and terrain surveys
- Environmental monitoring
- GIS ground-truthing
- Educational field exercises
- Ecological transects
- GPS accuracy verification

DATA QUALITY

Each point includes timestamp, coordinates, GPS altitude, barometric altitude, and accuracy estimates. Compare GPS (stable long-term) with barometer (smooth short-term) for optimal results.

PRIVACY

- All data stored locally
- No registration required
- No tracking or ads
- Location used only for GPS and USGS queries
- Open methodology

REQUIREMENTS

iPhone 6 or newer, iOS 17.0+, location permission, internet for USGS calibration

Created by a GIS specialist for the research community. Free forever.

The only altimeter with true nationwide one-touch calibration.


## Version history (last 1 release)

### 1.0 — 2025-11-22

No release notes.

## Apps similar to Scientific Altimeter

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Hello Heels](https://appshunter.io/ios/app/hello-heels/id924947572) | 5.0 (2) | Free | Education |
| [AILA Conferences](https://appshunter.io/ios/app/aila-conferences/id6745190421) | — | Free | Education |
| [Globo: Learn World Geography](https://appshunter.io/ios/app/globo/id6747730729) | 4.7 (335) | Free | Education |
| [BirdWeather](https://appshunter.io/ios/app/birdweather/id6446207088) | 4.4 (20) | Free | Education |

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-02-23.*