Geomap: Add measuring tools (#51608)

* Geomap: add measuring tools

* Add measure type selection

* Add controls and state to measure overlay

* Override tooltip mouse events when menu active

* Move measure tools to top right

* Lay groundwork for units and consolidate measuring

* Create measure vector layer class

* Improve styling to match other overlay controls

* Consolidate styling and use theme2

* Update unit language and add km2

Co-authored-by: Ryan McKinley <ryantxu@gmail.com>
Co-authored-by: nmarrs <nathanielmarrs@gmail.com>

.betterer.results

@@ -8639,6 +8639,11 @@ exports[`better eslint`] = {
       [0, 0, 0, "Do not use any type assertions.", "5"],
       [0, 0, 0, "Do not use any type assertions.", "6"]
     ],
+    "public/app/plugins/panel/geomap/components/MeasureVectorLayer.ts:5381": [
+      [0, 0, 0, "Do not use any type assertions.", "0"],
+      [0, 0, 0, "Do not use any type assertions.", "1"],
+      [0, 0, 0, "Do not use any type assertions.", "2"]
+    ],
     "public/app/plugins/panel/geomap/editor/FrameSelectionEditor.tsx:5381": [
       [0, 0, 0, "Do not use any type assertions.", "0"],
       [0, 0, 0, "Do not use any type assertions.", "1"]

packages/grafana-ui/src/types/icon.ts

@@ -148,6 +148,7 @@ export const getAvailableIcons = () =>
     'record-audio',
     'repeat',
     'rocket',
+    'ruler-combined',
     'save',
     'search',
     'search-minus',

public/app/plugins/panel/geomap/GeomapOverlay.tsx

@@ -1,39 +1,33 @@
 import { css } from '@emotion/css';
-import React, { CSSProperties, PureComponent } from 'react';
+import React, { CSSProperties } from 'react';
 
-import { GrafanaTheme } from '@grafana/data';
-import { config } from '@grafana/runtime';
-import { stylesFactory } from '@grafana/ui';
+import { GrafanaTheme2 } from '@grafana/data';
+import { useStyles2 } from '@grafana/ui';
 
 export interface OverlayProps {
-  topRight?: React.ReactNode[];
+  topRight1?: React.ReactNode[];
+  topRight2?: React.ReactNode[];
   bottomLeft?: React.ReactNode[];
   blStyle?: CSSProperties;
 }
 
-export class GeomapOverlay extends PureComponent<OverlayProps> {
-  style = getStyles(config.theme);
+export const GeomapOverlay = ({ topRight1, topRight2, bottomLeft, blStyle }: OverlayProps) => {
+  const topRight1Exists = (topRight1 && topRight1.length > 0) ?? false;
+  const styles = useStyles2(getStyles(topRight1Exists));
+  return (
+    <div className={styles.overlay}>
+      {Boolean(topRight1?.length) && <div className={styles.TR1}>{topRight1}</div>}
+      {Boolean(topRight2?.length) && <div className={styles.TR2}>{topRight2}</div>}
+      {Boolean(bottomLeft?.length) && (
+        <div className={styles.BL} style={blStyle}>
+          {bottomLeft}
+        </div>
+      )}
+    </div>
+  );
+};
 
-  constructor(props: OverlayProps) {
-    super(props);
-  }
-
-  render() {
-    const { topRight, bottomLeft } = this.props;
-    return (
-      <div className={this.style.overlay}>
-        {Boolean(topRight?.length) && <div className={this.style.TR}>{topRight}</div>}
-        {Boolean(bottomLeft?.length) && (
-          <div className={this.style.BL} style={this.props.blStyle}>
-            {bottomLeft}
-          </div>
-        )}
-      </div>
-    );
-  }
-}
-
-const getStyles = stylesFactory((theme: GrafanaTheme) => ({
+const getStyles = (topRight1Exists: boolean) => (theme: GrafanaTheme2) => ({
   overlay: css`
     position: absolute;
     width: 100%;
@@ -41,9 +35,15 @@ const getStyles = stylesFactory((theme: GrafanaTheme) => ({
     z-index: 500;
     pointer-events: none;
   `,
-  TR: css`
+  TR1: css`
+    right: 0.5em;
+    pointer-events: auto;
     position: absolute;
-    top: 8px;
+    top: 0.5em;
+  `,
+  TR2: css`
+    position: absolute;
+    top: ${topRight1Exists ? '80' : '8'}px;
     right: 8px;
     pointer-events: auto;
   `,
@@ -53,4 +53,4 @@ const getStyles = stylesFactory((theme: GrafanaTheme) => ({
     left: 8px;
     pointer-events: auto;
   `,
-}));
+});

public/app/plugins/panel/geomap/GeomapPanel.tsx

@@ -34,6 +34,7 @@ import { PanelEditExitedEvent } from 'app/types/events';
 import { GeomapOverlay, OverlayProps } from './GeomapOverlay';
 import { GeomapTooltip } from './GeomapTooltip';
 import { DebugOverlay } from './components/DebugOverlay';
+import { MeasureOverlay } from './components/MeasureOverlay';
 import { GeomapHoverPayload, GeomapLayerHover } from './event';
 import { getGlobalStyles } from './globalStyles';
 import { defaultMarkersConfig, MARKERS_LAYER_ID } from './layers/data/markersLayer';
@@ -50,6 +51,7 @@ interface State extends OverlayProps {
   ttip?: GeomapHoverPayload;
   ttipOpen: boolean;
   legends: ReactNode[];
+  measureMenuActive?: boolean;
 }
 
 export interface GeomapLayerActions {
@@ -246,15 +248,11 @@ export class GeomapPanel extends Component<Props, State> {
    */
   optionsChanged(options: GeomapPanelOptions) {
     const oldOptions = this.props.options;
-    console.log('options changed!', options);
-
     if (options.view !== oldOptions.view) {
-      console.log('View changed');
       this.map!.setView(this.initMapView(options.view, this.map!.getLayers()));
     }
 
     if (options.controls !== oldOptions.controls) {
-      console.log('Controls changed');
       this.initControls(options.controls ?? { showZoom: true, showAttribution: true });
     }
   }
@@ -361,6 +359,10 @@ export class GeomapPanel extends Component<Props, State> {
   };
 
   pointerMoveListener = (evt: MapBrowserEvent<UIEvent>) => {
+    // If measure menu is open, bypass tooltip logic and display measuring mouse events
+    if (this.state.measureMenuActive) {
+      return true;
+    }
     if (!this.map || this.state.ttipOpen) {
       return false;
     }
@@ -652,12 +654,26 @@ export class GeomapPanel extends Component<Props, State> {
     }
 
     // Update the react overlays
-    let topRight: ReactNode[] = [];
-    if (options.showDebug) {
-      topRight = [<DebugOverlay key="debug" map={this.map} />];
+    let topRight1: ReactNode[] = [];
+    if (options.showMeasure) {
+      topRight1 = [
+        <MeasureOverlay
+          key="measure"
+          map={this.map}
+          // Lifts menuActive state and resets tooltip state upon close
+          menuActiveState={(value: boolean) => {
+            this.setState({ ttipOpen: value, measureMenuActive: value });
+          }}
+        />,
+      ];
     }
 
-    this.setState({ topRight });
+    let topRight2: ReactNode[] = [];
+    if (options.showDebug) {
+      topRight2 = [<DebugOverlay key="debug" map={this.map} />];
+    }
+
+    this.setState({ topRight1, topRight2 });
   }
 
   getLegends() {
@@ -672,7 +688,7 @@ export class GeomapPanel extends Component<Props, State> {
   }
 
   render() {
-    let { ttip, ttipOpen, topRight, legends } = this.state;
+    let { ttip, ttipOpen, topRight1, legends, topRight2 } = this.state;
     const { options } = this.props;
     const showScale = options.controls.showScale;
     if (!ttipOpen && options.tooltip?.mode === TooltipMode.None) {
@@ -684,7 +700,12 @@ export class GeomapPanel extends Component<Props, State> {
         <Global styles={this.globalCSS} />
         <div className={this.style.wrap} onMouseLeave={this.clearTooltip}>
           <div className={this.style.map} ref={this.initMapRef}></div>
-          <GeomapOverlay bottomLeft={legends} topRight={topRight} blStyle={{ bottom: showScale ? '35px' : '8px' }} />
+          <GeomapOverlay
+            bottomLeft={legends}
+            topRight1={topRight1}
+            topRight2={topRight2}
+            blStyle={{ bottom: showScale ? '35px' : '8px' }}
+          />
         </div>
         <GeomapTooltip ttip={ttip} isOpen={ttipOpen} onClose={this.tooltipPopupClosed} />
       </>

public/app/plugins/panel/geomap/components/MeasureOverlay.tsx

@@ -0,0 +1,139 @@
+import { css } from '@emotion/css';
+import Map from 'ol/Map';
+import React, { useMemo, useRef, useState } from 'react';
+
+import { GrafanaTheme2, SelectableValue } from '@grafana/data';
+import { Button, IconButton, RadioButtonGroup, Select, stylesFactory } from '@grafana/ui';
+import { config } from 'app/core/config';
+
+import { MapMeasure, MapMeasureOptions, measures } from '../utils/measure';
+
+import { MeasureVectorLayer } from './MeasureVectorLayer';
+
+type Props = {
+  map: Map;
+  menuActiveState: (value: boolean) => void;
+};
+
+export const MeasureOverlay = ({ map, menuActiveState }: Props) => {
+  const vector = useRef(new MeasureVectorLayer());
+  const measureStyle = getStyles(config.theme2);
+
+  // Menu State Management
+  const [firstLoad, setFirstLoad] = useState<boolean>(true);
+  const [menuActive, setMenuActive] = useState<boolean>(false);
+
+  // Options State
+  const [options, setOptions] = useState<MapMeasureOptions>({
+    action: measures[0].value!,
+    unit: measures[0].units[0].value!,
+  });
+  const unit = useMemo(() => {
+    const action = measures.find((m: MapMeasure) => m.value === options.action) ?? measures[0];
+    const current = action.getUnit(options.unit);
+    vector.current.setOptions(options);
+    return {
+      current,
+      options: action.units,
+    };
+  }, [options]);
+
+  const clearPrevious = true;
+  const showSegments = false;
+
+  function toggleMenu() {
+    setMenuActive(!menuActive);
+    // Lift menu state
+    // TODO: consolidate into one state
+    menuActiveState(!menuActive);
+    if (menuActive) {
+      map.removeInteraction(vector.current.draw);
+      vector.current.setVisible(false);
+    } else {
+      if (firstLoad) {
+        // Initialize on first load
+        setFirstLoad(false);
+        map.addLayer(vector.current);
+        map.addInteraction(vector.current.modify);
+      }
+      vector.current.setVisible(true);
+      map.removeInteraction(vector.current.draw); // Remove last interaction
+      const a = measures.find((v: MapMeasure) => v.value === options.action) ?? measures[0];
+      vector.current.addInteraction(map, a.geometry, showSegments, clearPrevious);
+    }
+  }
+
+  return (
+    <div className={`${measureStyle.infoWrap} ${!menuActive ? measureStyle.infoWrapClosed : null}`}>
+      {menuActive ? (
+        <div>
+          <div className={measureStyle.rowGroup}>
+            <RadioButtonGroup
+              value={options.action}
+              options={measures}
+              size="md"
+              fullWidth={false}
+              onChange={(e: string) => {
+                map.removeInteraction(vector.current.draw);
+                const m = measures.find((v: MapMeasure) => v.value === e) ?? measures[0];
+                const unit = m.getUnit(options.unit);
+                setOptions({ ...options, action: m.value!, unit: unit.value! });
+                vector.current.addInteraction(map, m.geometry, showSegments, clearPrevious);
+              }}
+            />
+            <Button className={measureStyle.button} icon="times" variant="secondary" size="sm" onClick={toggleMenu} />
+          </div>
+          <Select
+            className={measureStyle.unitSelect}
+            value={unit.current}
+            options={unit.options}
+            isSearchable={false}
+            onChange={(v: SelectableValue<string>) => {
+              const a = measures.find((v: SelectableValue<string>) => v.value === options.action) ?? measures[0];
+              const unit = a.getUnit(v.value) ?? a.units[0];
+              setOptions({ ...options, unit: unit.value! });
+            }}
+          />
+        </div>
+      ) : (
+        <IconButton
+          className={measureStyle.icon}
+          name="ruler-combined"
+          tooltip="show measure tools"
+          tooltipPlacement="left"
+          onClick={toggleMenu}
+        />
+      )}
+    </div>
+  );
+};
+
+const getStyles = stylesFactory((theme: GrafanaTheme2) => ({
+  button: css`
+    margin-left: auto;
+  `,
+  icon: css`
+    background-color: ${theme.colors.secondary.main};
+    display: inline-block;
+    height: 19.25px;
+    margin: 1px;
+    width: 19.25px;
+  `,
+  infoWrap: css`
+    color: ${theme.colors.text};
+    background-color: ${theme.colors.background.secondary};
+    border-radius: 4px;
+    padding: 2px;
+  `,
+  infoWrapClosed: css`
+    height: 25.25px;
+    width: 25.25px;
+  `,
+  rowGroup: css`
+    display: flex;
+    justify-content: flex-end;
+  `,
+  unitSelect: css`
+    min-width: 200px;
+  `,
+}));

public/app/plugins/panel/geomap/components/MeasureVectorLayer.ts

@@ -0,0 +1,255 @@
+import { FeatureLike } from 'ol/Feature';
+import Map from 'ol/Map';
+import { Coordinate } from 'ol/coordinate';
+import { Geometry, LineString, Point, Polygon } from 'ol/geom';
+import { Type } from 'ol/geom/Geometry';
+import { Draw, Modify } from 'ol/interaction';
+import VectorLayer from 'ol/layer/Vector';
+import VectorSource from 'ol/source/Vector';
+import { getArea, getLength } from 'ol/sphere';
+import { Circle as CircleStyle, Fill, RegularShape, Stroke, Style, Text } from 'ol/style';
+
+import { formattedValueToString } from '@grafana/data';
+
+import { MapMeasureOptions, measures } from '../utils/measure';
+
+export class MeasureVectorLayer extends VectorLayer<VectorSource> {
+  opts: MapMeasureOptions = {
+    action: 'length',
+    unit: 'm',
+  };
+  constructor() {
+    super({
+      source: new VectorSource(),
+    });
+    this.setStyle((feature) => {
+      return this.styleFunction(feature, false);
+    });
+    this.setVisible(true);
+  }
+
+  setOptions(options: MapMeasureOptions) {
+    this.opts = options;
+    this.getSource()?.refresh();
+  }
+
+  getMapMeasurement(geo: Geometry): string {
+    let v = 0;
+    let action = measures[0];
+    if (this.opts.action === 'area') {
+      action = measures[1];
+      v = getArea(geo);
+    } else {
+      v = getLength(geo);
+    }
+    return formattedValueToString(action.getUnit(this.opts.unit).format(v));
+  }
+
+  segmentStyle = new Style({
+    text: new Text({
+      font: '12px Calibri,sans-serif',
+      fill: new Fill({
+        color: 'rgba(255, 255, 255, 1)',
+      }),
+      backgroundFill: new Fill({
+        color: 'rgba(0, 0, 0, 0.4)',
+      }),
+      padding: [2, 2, 2, 2],
+      textBaseline: 'bottom',
+      offsetY: -12,
+    }),
+    image: new RegularShape({
+      radius: 6,
+      points: 3,
+      angle: Math.PI,
+      displacement: [0, 8],
+      fill: new Fill({
+        color: 'rgba(0, 0, 0, 0.4)',
+      }),
+    }),
+  });
+
+  segmentStyles = [this.segmentStyle];
+
+  // Open Layer styles
+  shapeStyle = [
+    new Style({
+      fill: new Fill({
+        color: 'rgba(255, 255, 255, 0.2)',
+      }),
+      image: new CircleStyle({
+        radius: 5,
+        stroke: new Stroke({
+          color: 'rgba(0, 0, 0, 0.7)',
+        }),
+        fill: new Fill({
+          color: 'rgba(255, 255, 255, 0.2)',
+        }),
+      }),
+    }),
+    new Style({
+      stroke: new Stroke({
+        color: [0, 0, 0, 1],
+        width: 2,
+        lineDash: [4, 8],
+        lineDashOffset: 6,
+      }),
+    }),
+    new Style({
+      stroke: new Stroke({
+        color: [255, 255, 255, 1],
+        width: 2,
+        lineDash: [4, 8],
+      }),
+    }),
+  ];
+
+  labelStyle = new Style({
+    text: new Text({
+      font: '14px Calibri,sans-serif',
+      fill: new Fill({
+        color: 'rgba(255, 255, 255, 1)',
+      }),
+      backgroundFill: new Fill({
+        color: 'rgba(0, 0, 0, 0.7)',
+      }),
+      padding: [3, 3, 3, 3],
+      textBaseline: 'bottom',
+      offsetY: -15,
+    }),
+    image: new RegularShape({
+      radius: 8,
+      points: 3,
+      angle: Math.PI,
+      displacement: [0, 10],
+      fill: new Fill({
+        color: 'rgba(0, 0, 0, 0.7)',
+      }),
+    }),
+  });
+
+  tipStyle = new Style({
+    text: new Text({
+      font: '12px Calibri,sans-serif',
+      fill: new Fill({
+        color: 'rgba(255, 255, 255, 1)',
+      }),
+      backgroundFill: new Fill({
+        color: 'rgba(0, 0, 0, 0.4)',
+      }),
+      padding: [2, 2, 2, 2],
+      textAlign: 'left',
+      offsetX: 15,
+    }),
+  });
+
+  modifyStyle = new Style({
+    image: new CircleStyle({
+      radius: 5,
+      stroke: new Stroke({
+        color: 'rgba(0, 0, 0, 0.7)',
+      }),
+      fill: new Fill({
+        color: 'rgba(0, 0, 0, 0.4)',
+      }),
+    }),
+    text: new Text({
+      text: 'Drag to modify',
+      font: '12px Calibri,sans-serif',
+      fill: new Fill({
+        color: 'rgba(255, 255, 255, 1)',
+      }),
+      backgroundFill: new Fill({
+        color: 'rgba(0, 0, 0, 0.7)',
+      }),
+      padding: [2, 2, 2, 2],
+      textAlign: 'left',
+      offsetX: 15,
+    }),
+  });
+
+  readonly modify = new Modify({ source: this.getSource()!, style: this.modifyStyle });
+  tipPoint!: Geometry;
+  draw!: Draw; // global so we can remove it later
+
+  styleFunction(feature: FeatureLike, segments: boolean, drawType?: string, tip?: string): Style[] {
+    const styles = [...this.shapeStyle];
+    const geometry = feature.getGeometry() as Geometry;
+    if (geometry) {
+      const type = geometry.getType();
+      let point: Point;
+      let label: string;
+      let line: LineString;
+      if (!drawType || drawType === type) {
+        if (type === 'Polygon') {
+          const poly = geometry as Polygon;
+          point = poly.getInteriorPoint();
+          label = this.getMapMeasurement(geometry);
+          line = new LineString(poly.getCoordinates()[0]);
+        } else if (type === 'LineString') {
+          line = geometry as LineString;
+          point = new Point(line.getLastCoordinate());
+          label = this.getMapMeasurement(geometry);
+        }
+      }
+      if (segments && line!) {
+        let count = 0;
+        line.forEachSegment((a: Coordinate, b: Coordinate) => {
+          const segment = new LineString([a, b]);
+          const label = this.getMapMeasurement(segment);
+          if (this.segmentStyles.length - 1 < count) {
+            this.segmentStyles.push(this.segmentStyle.clone());
+          }
+          const segmentPoint = new Point(segment.getCoordinateAt(0.5));
+          this.segmentStyles[count].setGeometry(segmentPoint);
+          this.segmentStyles[count].getText().setText(label);
+          styles.push(this.segmentStyles[count]);
+          count++;
+        });
+      }
+      if (label!) {
+        this.labelStyle.setGeometry(point!);
+        this.labelStyle.getText().setText(label);
+        styles.push(this.labelStyle);
+      }
+      if (tip && type === 'Point' && !this.modify.getOverlay().getSource().getFeatures().length) {
+        this.tipPoint = geometry;
+        this.tipStyle.getText().setText(tip);
+        styles.push(this.tipStyle);
+      }
+    }
+    return styles;
+  }
+
+  addInteraction(map: Map, typeSelect: Type, showSegments: boolean, clearPrevious: boolean) {
+    const drawType = typeSelect;
+    const activeTip =
+      ' Click to continue ' + (drawType === 'Polygon' ? 'polygon' : 'line') + ' \n (double-click to end) ';
+    const idleTip = ' Click to start ';
+    let tip = idleTip;
+    this.draw = new Draw({
+      source: this.getSource()!,
+      type: drawType,
+      style: (feature) => {
+        return this.styleFunction(feature, showSegments, drawType, tip);
+      },
+    });
+    this.draw.on('drawstart', () => {
+      if (clearPrevious) {
+        this.getSource()!.clear();
+      }
+      this.modify.setActive(false);
+      tip = activeTip;
+    });
+    this.draw.on('drawend', () => {
+      this.modifyStyle.setGeometry(this.tipPoint);
+      this.modify.setActive(true);
+      map.once('pointermove', () => {
+        this.modifyStyle.setGeometry('');
+      });
+      tip = idleTip;
+    });
+    this.modify.setActive(true);
+    map.addInteraction(this.draw);
+  }
+}

public/app/plugins/panel/geomap/globalStyles.ts

@@ -56,10 +56,10 @@ export function getGlobalStyles(theme: GrafanaTheme2) {
       color: ${theme.colors.text.primary}; //  #eee;
     }
     .ol-control {
-      background-color: ${theme.colors.background.secondary}; //rgba(255,255,255,0.4);
+      background-color: ${theme.colors.background.primary}; //rgba(255,255,255,0.4);
     }
     .ol-control:hover {
-      background-color: ${theme.colors.action.hover}; // rgba(255,255,255,0.6);
+      background-color: ${theme.colors.background.secondary}; // rgba(255,255,255,0.6);
     }
     .ol-control button {
       color: ${theme.colors.secondary.text}; // white;

public/app/plugins/panel/geomap/module.tsx

@@ -122,6 +122,13 @@ export const plugin = new PanelPlugin<GeomapPanelOptions>(GeomapPanel)
         description: 'Show map info',
         defaultValue: false,
       })
+      .addBooleanSwitch({
+        category,
+        path: 'controls.showMeasure',
+        name: 'Show measure tools',
+        description: 'Show tools for making measurements on the map',
+        defaultValue: false,
+      })
       .addRadio({
         category,
         path: 'tooltip.mode',

public/app/plugins/panel/geomap/types.ts

@@ -26,6 +26,9 @@ export interface ControlsOptions {
 
   // Show debug
   showDebug?: boolean;
+
+  // Show measure
+  showMeasure?: boolean;
 }
 
 export enum TooltipMode {

public/app/plugins/panel/geomap/utils/measure.test.ts

@@ -0,0 +1,16 @@
+import { measures } from './measure';
+
+describe('get measure utils', () => {
+  it('switch from length to area', () => {
+    const length = measures[0];
+    expect(length.value).toBe('length');
+    expect(length.getUnit('ft').value).toBe('ft');
+    expect(length.getUnit('ft2').value).toBe('ft');
+  });
+  it('switch from area to length', () => {
+    const area = measures[1];
+    expect(area.value).toBe('area');
+    expect(area.getUnit('ft2').value).toBe('ft2');
+    expect(area.getUnit('ft').value).toBe('ft2');
+  });
+});

public/app/plugins/panel/geomap/utils/measure.ts

@@ -0,0 +1,106 @@
+import { FormattedValue, getValueFormat, SelectableValue, toFixedUnit } from '@grafana/data';
+
+type MeasureAction = 'area' | 'length';
+
+export interface MapMeasureOptions {
+  action: MeasureAction;
+  unit: string;
+  color?: string;
+}
+
+export interface MapMeasure extends SelectableValue<MeasureAction> {
+  geometry: 'Polygon' | 'LineString';
+  units: MapUnit[];
+
+  /**
+   * This will get the best unit for the selected string or a default
+   * This is helpful when converting from area<>length, we should try to stay
+   * in the same category of unit if possible
+   */
+  getUnit: (v?: string) => MapUnit;
+}
+
+export interface MapUnit extends SelectableValue<string> {
+  format: (si: number) => FormattedValue;
+}
+
+export const measures: MapMeasure[] = [
+  {
+    value: 'length',
+    label: 'Length',
+    geometry: 'LineString',
+    units: [
+      {
+        label: 'Metric (m/km)',
+        value: 'm',
+        format: (m: number) => getValueFormat('lengthm')(m),
+      },
+      {
+        label: 'Feet (ft)',
+        value: 'ft',
+        format: (m: number) => getValueFormat('lengthft')(m * 3.28084),
+      },
+      {
+        label: 'Miles (mi)',
+        value: 'mi',
+        format: (m: number) => getValueFormat('lengthmi')(m / 1609.0),
+      },
+      {
+        label: 'Nautical miles (nmi)',
+        value: 'nmi',
+        format: (m: number) => getValueFormat('nmi')(m / 1852.0),
+      },
+    ],
+    getUnit: (v?: string) => {
+      const units = measures[0].units;
+      if (v?.endsWith('2')) {
+        v = v.substring(0, v.length - 1);
+      }
+      return units.find((u) => u.value === v) ?? units[0];
+    },
+  },
+  {
+    value: 'area',
+    label: 'Area',
+    geometry: 'Polygon',
+    units: [
+      {
+        label: 'Square Meters (m²)',
+        value: 'm2',
+        format: (m2: number) => getValueFormat('areaM2')(m2),
+      },
+      {
+        label: 'Square Kilometers (km²)',
+        value: 'km2',
+        format: (m2: number) => toFixedUnit('km²')(m2 * 1e-6),
+      },
+      {
+        label: 'Square Feet (ft²)',
+        value: 'ft2',
+        format: (m2: number) => getValueFormat('areaF2')(m2 * 10.76391),
+      },
+      {
+        label: 'Square Miles (mi²)',
+        value: 'mi2',
+        format: (m2: number) => getValueFormat('areaMI2')(m2 * 3.861e-7),
+      },
+      {
+        label: 'Acres',
+        value: 'acre2',
+        format: (m2: number) => toFixedUnit('acre')(m2 * 2.47105e-4),
+      },
+      {
+        label: 'Hectare',
+        value: 'hectare2',
+        format: (m2: number) => toFixedUnit('ha')(m2 * 1e-4),
+      },
+    ],
+    getUnit: (v?: string) => {
+      const units = measures[1].units;
+      if (!v?.endsWith('2')) {
+        v += '2';
+      }
+      return units.find((u) => u.value === v) ?? units[0];
+    },
+  },
+];