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TerraTopo

TerraTopo overview

What TerraTopo is for, and how the numbered steps on the left and the heatmap on the right fit together.

Updated October 27, 2026 · 2 min read · Open TerraTopo

TerraTopo turns a floor elevation survey into a color heatmap on the house plan. Load the plan, enter the readings from your zip level or laser, and TerraTopo shows where the floor is low, how steep the changes are, and where repairs would go.

Open it from your programs page or go to /terratopo/app.

TerraTopo with a sample plan, 30 readings, the heatmap and contour lines
TerraTopo with a sample plan, 30 readings, the heatmap and contour lines

The screen

On the right is the plan with the heatmap. The badges along the top show the plan size, how many points and outlines you have, and the foundation type. The color bar along the bottom is the legend:

  • Green is at or above your reference point (0.0").
  • Yellow, red and maroon are lower and lower spots.

On the left are your account box and twelve numbered steps. The Terralox button at the top of that column (on a phone, at the left of the badges above the plan) goes to the terralox.com home page; tap the small arrow next to it for My account, Jobs, your other programs, the Help Center and Sign out. The TerraTopo logo goes to your programs page. Work down them in order. Most are optional.

StepWhat it does
1. Floor planLoad the plan picture or PDF.
2. Foundation profilePick slab, crawl space or basement. Sets the tolerances and repair options.
3. Click modeChoose whether a click marks a point or draws an outline.
4. Floor area outlinesKeep the heatmap inside the house. Add interior walls.
5. Scale & auto-gridSet the real-world scale and drop an even grid of points.
6. Import readingsPaste a list of readings instead of typing each one.
7. Elevation pointsThe list of every reading.
8. Heatmap settingsOpacity, contour lines, steep transition areas.
9. Structural diagnosticsLow-confidence shading, stress points and the repair layout.
10. StatisticsLowest, highest, average and range.
11. Export & save surveyDownload the heatmap picture or the survey file.
12. Compare to a previous surveyShow movement since an earlier visit.

The account box at the top has Save to my account, My projects and Save as copy (keep the original). My projects opens your company's jobs as address folders, the same folders as TerraPlan, TerraCam and the Jobs page.

Does TerraTopo work on a phone?

Yes. On a narrow screen the plan sits on top and the steps scroll underneath it.

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Related articles

Start a floor elevation surveyLoad a floor plan into TerraTopo, set the foundation profile and get ready to enter readings.Enter elevation readingsClick the plan to drop each reading, edit or delete points, or import a whole list of readings at once.Save, export and compare surveysSave surveys to your account, download the heatmap picture or survey file, and compare a new visit to an earlier one.

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