🧭 Project: build a point, route, or area

Why this matters

Building one object end to end connects abstract geometry to an actual map and prepares you for more complicated GIS workflows.

Learn it

Choose whether your idea is a Point, LineString, or Polygon based on its meaning. Add coordinates in the correct order. Add only properties that describe the feature rather than duplicating geometry. Inspect the GeoJSON and map result. Then ask what spatial operation would be useful: distance, containment, route display, geofence, intersection, or observation attachment.

Work through an example

A sampling station can be a Point, a survey transect can be a LineString, and the project study area can be a Polygon.

Point → one place
LineString → ordered path
Polygon → area/boundary

Practice

1. 1Build each of the three geometry types once.
2. 2Add one meaningful property and explain why it belongs outside geometry.
3. 3Choose a spatial question that matches each object.

Try it

{
  "type": "Feature",
  "properties": {
    "title": "",
    "emoji": "📍"
  },
  "geometry": {
    "type": "Point",
    "coordinates": [
      -122.3321,
      47.6062
    ]
  }
}