What is the Search & Rescue Grid multi-solver?

Search & Rescue Grid is a guided workflow that chains 2 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.

Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.

Earth & First Responders Pack · Multi-Solver

Search & Rescue Grid

Probability & coverage. This multi-solver chains 2 solvers into a single guided workflow — run each step in order and carry the result forward.

Workflow steps

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Viewshed

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Viewshed / Line of SightLive

what can you see from here?

Controls

Presets

Observer position

Observer height (m)

A viewshed marks every point visible from an observer, hidden behind intervening ridges. Scanning outward, a point is seen only if its angle above the horizontal exceeds every closer obstacle — so terrain shadows fall behind hills. Raising the observer reveals far more. It is essential for siting cell towers, wind turbines, scenic overlooks, and military positions.

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Data Inspector

Visible cells0

Coverage0%

Observer height10 m

Governing equation

d_{horizon} = 2 R h = 2 \cdot 6371 km \cdot 10 m \approx 11.3 km

Reading this result: At 10 m the observer sees over closer bumps but taller ridges still cast blind spots — coverage lands near 0%.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Spatial Interpolation

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Spatial Interpolation (IDW)Live

filling the gaps between measurements

Controls

Presets

Power parameter

Given scattered measurements — rainfall gauges, soil samples, air-quality sensors — inverse-distance weighting estimates values everywhere in between. Each sample's influence falls off with distance raised to a power: a low power gives smooth, blended surfaces; a high power makes each sample dominate its neighborhood in sharp bull's-eyes. The workhorse of GIS mapping.

▶ Run in Python

Data Inspector

Samples8

Power p2.0

Characterbalanced

Governing equation

\overset{z}{^} (x) = \frac{\sum _{i} w _{i} z _{i}}{\sum _{i} w _{i}}, w_{i} = \frac{1}{d _{i}^{2.0}}

Reading this result: At power 2.0 nearby samples win but distant ones still contribute — a balanced surface between smooth and spiky.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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More in the Earth & First Responders pack

Climate Scenario Model Watershed & Flood Kit Air Quality Model Coastal Erosion Groundwater Contamination Solar & Wind Site Wildfire Risk Map Glacier Mass Balance

Frequently asked questions

What is the Search & Rescue Grid multi-solver?: Search & Rescue Grid is a guided workflow that chains 2 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.
Is it free to use?: Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.