Understanding the Landscape · Lesson 5 of 5
Building Your First Map
~20 min
The Concept
It's time to combine everything: elevation, slope, watershed boundaries, land cover, and coordinate-matched station locations, into one map of Bluewater Basin. Your supervisor calls this your 'basemap', every later mission will overlay new data on top of exactly this map.
Building a basemap (the single trusted map every later mission will build on top of) isn't about making something pretty, it's about making sure every future layer of data lines up correctly and means what you think it means. A basemap you trust is what lets you say, later, 'the well with rising nitrate sits at the base of a steep agricultural slope' and know that claim is actually true.
The Analogy
A basemap is like the foundation of a house. Nobody visits a house to admire the foundation, but every wall, room, and roof depends on it being level and solid. Get it wrong, and every floor you build on top inherits the same crack.
Try It
Your completed basemap: elevation, watershed boundary, and all monitoring stations of Bluewater Basin.
Click anywhere on the basin. The line traces where a raindrop landing there would flow — always downhill toward the steepest neighbouring cell — until it reaches the outlet (clay marker) or a local low point.
Why Real Researchers Care
Every GIS-heavy research paper includes a 'study area' figure built exactly this way, terrain, boundaries, and sampling locations combined into one map before any statistics appear. Reviewers often check this figure first, because a wrong basemap undermines every result that follows from it.
Quick Check
Q1. Why does the basemap matter for every later mission in Research Atlas?
Your Goal
Identify one monitoring station on your basemap and write one sentence connecting its terrain (elevation, slope, watershed position) to what you'd expect from its data, you'll test this prediction with real data starting in Mission 2.
Hint: For example: a station low in the watershed, downhill from farmland, might be more exposed to agricultural runoff.
Teach It Back
In under four sentences, explain what a basemap is and why building it carefully now saves work in every later mission.