Terramark

The Terramark Blog

Practical guides on GPS photo documentation — coordinate formats, EXIF data, export formats, and field workflows that hold up as proof of work.

Guide

How to Add GPS Coordinates (Geotag) to Photos on iPhone and Android

Three ways to get coordinates onto a photo, and why a visible stamp beats hidden EXIF alone for field work.

Reference

UTM vs Decimal Degrees vs MGRS: Which Coordinate Format Should You Use?

What each format is actually for, and how to pick the right one for your next deliverable.

Guide

What Is GPS EXIF Data and Why It Matters for Site Documentation

How location gets embedded in a photo file, and why a visible stamp and EXIF metadata aren't the same thing.

Workflow

How to Create Proof-of-Work Photos for Field Inspections and Audits

What actually makes a site photo defensible later, and the five details it needs to carry.

Reference

KML vs GeoJSON vs CSV: Choosing the Right Export Format for GIS Software

What each format is built for, and which one your office's software actually wants.

Guide

Offline GPS Camera Apps: What Field Crews Need When There's No Signal

What "works offline" should actually mean, and the failure modes to check for before you rely on it.

Workflow

Free vs Pro Site Documentation Apps: Do You Need a Subscription?

How to tell whether a free tier is enough for your workload, or where it'll start costing you time.

Reference

Compass Azimuth in Site Photos: What It Is and How to Read It

True vs magnetic heading, why phone compasses drift, and how to read the ≈ symbol correctly.