https://www.youtube.com/watch?v=iHEMOdRo5u8

Topic: Coordinate Systems, Datums & How Latitude/Longitude Actually Work

Essential Question:

How do coordinate systems describe positions on Earth, and why do datums matter for accuracy?

🎯 Learning Intention

I will explain how latitude and longitude describe exact locations on Earth and how datums affect coordinate accuracy.

✅ Success Criteria

• I can interpret coordinate pairs correctly.
• I can explain the difference between a coordinate system and a datum.
• I can identify errors caused by mismatched datums or projections.
• I can show how latitude and longitude values relate to Earth’s geometry.

📚 Vocabulary

Coordinate System — A framework for determining exact positions on Earth.

Latitude — Measures position north/south of the equator (–90° to +90°).

Longitude — Measures position east/west of the Prime Meridian (–180° to +180°).

Degrees / Minutes / Seconds (DMS) — A way to express precise coordinates.

Decimal Degrees (DD) — Modern format used by GIS (+34.108°, –117.294°).

Datum — A mathematical Earth model that provides reference for coordinates.