Read the Land Before You Build: How Google Earth's New Terrain Tools Help African Projects
Terrain shapes almost every early decision on a site. It determines where water runs, how much a foundation costs, how steep an access road will be, and how much earth must be moved before construction begins.
No serious project skips a proper land survey. But sending a field team to a site nobody has studied yet wastes budget on questions that could have been answered at a desk.
Google has added four terrain analysis tools to Google Earth on the web: elevation contours, slope, aspect, and cut and fill. Each works the same way. You draw a polygon around your site, set your parameters, and read the results over 3D imagery.
The tools don't replace the survey, but they help teams understand the ground early enough to shape the survey, the first site layout, and the grading budget.
Four Tools, Four Questions About the Same Ground
Each tool answers a different question about a site:
Elevation contours: How does the ground rise and fall? Contours are drawn at 1-metre intervals. Tightly packed lines mean a steep bank. Widely spaced lines mean flatter, more buildable ground.
Slope: How steep is it? The slope layer is colour-coded by steepness. Google suggests checking ground between 5 and 10 degrees first, which commonly suits commercial foundations and parking. Above 15 degrees, specialist engineering and grading restrictions usually come into play.
Aspect: Which way does the land face? This matters for sun exposure, solar panels, and crops.
Cut and fill: How much earth has to move? The tool works out the volume to dig out and bring in, either at the level where the two balance or at a floor level you set.
Google also points out that where steep ground sits matters as much as how much there is. Steep ground along one boundary is a very different project from the same amount spread through the middle of the site.
The tools are available on all Google Earth plans. The Standard plan allows one tool layer a month, while Professional plans offer more.
Why This Matters for African Projects
For teams working across Africa, the first site visit is often the most expensive one. Sites can be remote, spread far apart, or hard to reach.
Being able to assess terrain from a desk helps teams:
Compare sites early: Rule out steep or awkward land before committing budget to a visit.
Focus fieldwork: Send survey teams to the parts of a site that carry the most risk.
Price earthworks sooner: Get an early view of cut-and-fill volumes when preparing a bid or budget.
Aspect also needs a Southern Hemisphere view. Google notes that in the south, north-facing slopes get the most sun year-round and provide the best growing conditions for crops.
That is useful for farms, vineyards, and solar projects across Southern Africa.
Partnering with a Local Google Maps Specialist
Google's mapping and location tools are powerful, but choosing the right ones for a project is not always simple. That is where 28East comes in.
As a Google Maps Premier Partner and Google Cloud partner, we focus on maps and location.
Our team holds Google Cloud professional certifications, and we offer local procurement, billing, and support for Google Maps Platform, along with help implementing and optimising it.
(Source: https://mapsplatform.google.com/resources/blog/a-field-guide-to-terrain-analysis-tools-in-google-earth/)
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