# XWUIChartGeospatialSurface

A geospatial-surface chart variant backed by `XWUIChart` that drapes a continuous value surface over a geographic area, useful for fields like elevation, temperature, or signal strength that vary smoothly across space. Provide named `series` of `{ x, y }` points (location key and value) and choose a `block` (1-4) and `size` preset.

## Basic Usage

Two named monthly series (Series A and Series B), each spanning Jan through Jun, supplied as the surface sample data.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: Two six-month series rendered as a geospatial surface at the md preset.
```

## Terrain Elevation Field

A gridded elevation surface where each series is one west-to-east row of sampled heights, draping a valley with a central ridge.

```example
file: examples/TerrainElevation.ts
html: examples/TerrainElevation.html
title: Terrain Elevation Field
description: A 4x5 elevation grid forming a continuous valley-and-ridge surface.
```

## Surface Temperature Field

Daytime air temperature sampled on a grid by latitude band, rising smoothly from the cool north to the hot south-east.

```example
file: examples/TemperatureField.ts
html: examples/TemperatureField.html
title: Surface Temperature Field
description: A 3x5 temperature surface gradient across latitude bands, with grid values.
```

```api
```