# Views on the map

> Draw a table's data on the map as coloured markers, a heatmap, bubbles, labels or contours, with a key.

A **view** is a saved selection of a table's rows: its filters, sort and columns.
On the map, a view draws those rows at their locations, so you can see SPT N values
across a site, where made ground is deepest, or which holes exceed a screening level.

<Callout type="note" title="A Pro feature">
  Views on the map are a **Pro** feature.
</Callout>

## Adding a view to the map

Open **Views** in the map's side panel. Your project and configuration views are
listed there, the same views as in the [table editor](/manage/table-editor/filtering-sorting-views).
Switch a view on to draw it, or create a new one from the panel and set its table
and filters there. Several views can be on at once.

## Styles

Each view has five styles. Switch on the ones you want, in any combination.

- **Markers** - colour and shape each location by rules on its data. Rules can use
  fields from the view's table or the tables above it, and the first rule that
  matches wins. **From a field** builds the rules for you, from a field's values or
  from ranges.
- **Heatmap** - a coloured surface of a value, estimated between the holes on fixed
  bands whose edges and colours you can set. If the holes were tested to very
  different depths, the heatmap says so and offers to read them all over one range.
- **Bubbles** - circles sized by a value, by area, on a scale fixed with the view.
- **Labels** - the reading beside each location, as recorded, with its depth, a
  prefix or a unit if you want them.
- **Contours** - lines through a value at a chosen interval, labelled along each line.

## Contours

Contours draw a **stratum** from the logged geology, or any numeric value.

<Steps>
  <Step title="Pick what to contour">
    Choose a **Stratum** and a **Measure**: its top or base depth, its thickness,
    or its top or base level.
  </Step>
  <Step title="Check which holes are used">
    The panel accounts for every hole: used, counted as 0 m, or left out and why
    (for example, a hole that stopped in the stratum, so its base is not proven).
  </Step>
  <Step title="Choose a method">
    **TIN** (the default), **IDW** or **Kriging**. Kriging shows its variogram, and
    every number in it can be changed.
  </Step>
</Steps>

Turn on **Colour between the lines** to fill the bands. A hole far out of line with
its neighbours is named, so a data error is not drawn as a real feature. Contours
need three holes or more with a value.

## The key

The **key** in the bottom right of the map explains what each switched-on view
draws: its marker rules, heatmap bands, bubble sizes and contour lines. It only
shows what was actually drawn. Open a view's row to see its key, or fold the whole
key away with **-**.

Site plans exported from the map carry the same keys in their legend block, under
the location types.