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SpaceIndex vs. Traditional Suitability Models
How a modular, app‑hosted approach accelerates planning—while staying transparent and auditable.
Browser-based GISGeoAI + spatial analyticsSouth African context
GUIDE
1. Traditional suitability remains valuable
Weighted overlay, Boolean constraints and multi-criteria evaluation are powerful because the logic can be made explicit. A planner can show which criteria were included, how they were normalised and why a site received a particular score.
GUIDE
2. The weakness is often workflow friction
The problem is not the method itself. Traditional models can become difficult to iterate when every scenario requires manual preprocessing, repeated raster calculations and duplicated outputs. This can make sensitivity testing slower than it should be.
GUIDE
3. Scenario-driven tools change the interaction model
A scenario tool such as SpaceIndex can make criteria, weights, exclusions and goals more interactive. Users can compare alternatives quickly, but the system is only useful if those changes remain transparent and reproducible.
GUIDE
4. Data quality still dominates the result
No interface can compensate for stale zoning, poor parcel geometry, coarse environmental data or missing infrastructure context. Suitability models should preserve source dates, scale and limitations alongside the score.
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5. Constraints and preferences should be separate
Absolute exclusions—such as prohibited land—should generally be treated differently from scored preferences. Mixing them into one weighted sum can produce a high-scoring site that is still unusable.
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6. Sensitivity testing matters
Change weights, thresholds and normalisation choices and observe whether the shortlist is stable. If a small weight change completely reverses the ranking, the model is signalling uncertainty that should be discussed, not hidden.
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7. Use the right tool for the stage
Traditional GIS is excellent for detailed, controlled spatial modelling. Scenario-driven tools are especially useful for early screening, rapid comparison and stakeholder discussion. In many professional workflows, the strongest approach combines both.
GUIDE
8. The result is a screening instrument
Suitability does not equal approval. Planning rights, site conditions, ownership, engineering feasibility and stakeholder processes may still determine whether a candidate is viable.
PRACTICAL CHECKLIST
Questions to ask before applying the approach
Use these questions to test whether the workflow is ready for a real project.
- Are constraints separated from weighted preferences?
- Can a user reproduce the criteria and weights?
- Has sensitivity been tested across plausible scenarios?
- Is the final shortlist verified outside the model?