First commit.

src/FieldServiceProvider.php

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+<?php
+
+namespace Lassehaslev\NovaMapFields;
+
+use Laravel\Nova\Nova;
+use Laravel\Nova\Events\ServingNova;
+use Illuminate\Support\ServiceProvider;
+
+class FieldServiceProvider extends ServiceProvider
+{
+    /**
+     * Bootstrap any application services.
+     */
+    public function boot()
+    {
+        Nova::serving(function (ServingNova $event) {
+            Nova::script('nova-map-fields', __DIR__.'/../dist/js/field.js');
+            Nova::style('nova-map-fields', __DIR__.'/../dist/css/field.css');
+        });
+    }
+
+    /**
+     * Register any application services.
+     */
+    public function register()
+    {
+    }
+}

src/MapField.php

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+<?php
+
+namespace Lassehaslev\NovaMapFields;
+
+use Laravel\Nova\Fields\Field;
+use Illuminate\Support\Str;
+
+abstract class MapField extends Field
+{
+    /**
+     * The field's component.
+     *
+     * @var string
+     */
+    public $component = 'nova-map-fields';
+
+    /**
+     * Hide from index field.
+     *
+     * @var bool
+     */
+    public $showOnIndex = false;
+
+    /**
+     * Create a new field.
+     * And set default properties.
+     *
+     * @param string      $name
+     * @param string|null $attribute
+     * @param mixed|null  $resolveCallback
+     */
+    public function __construct($name, $attribute = null, $resolveCallback = null)
+    {
+        $this->setHeight('250px');
+        $this->setCenter(0, 0);
+        $this->setZoom(13);
+
+        $this->withMapMeta('type', $this->getMapFieldType());
+
+        parent::__construct($name, $attribute = null, $resolveCallback);
+    }
+
+    /**
+     * Set the height for the map.
+     *
+     * @param mixed $height
+     *
+     * @return $this
+     */
+    public function setHeight($height)
+    {
+        return $this->withMapMeta('height', $height);
+    }
+
+    /**
+     * Set the zoom for the map.
+     *
+     * @param mixed $level
+     *
+     * @return $this
+     */
+    public function setZoom($level)
+    {
+        return $this->withMapMeta('zoom', $level);
+    }
+
+    /**
+     * Set the position for the map.
+     *
+     * @param mixed $latitude
+     * @param mixed $longitude
+     *
+     * @return $this
+     */
+    public function setCenter($latitude, $longitude)
+    {
+        return $this->withMapMeta('center', [
+            'latitude' => $latitude,
+            'longitude' => $longitude,
+        ]);
+    }
+
+    /**
+     * Add meta data for the map.
+     *
+     * @param mixed $key
+     * @param mixed $value
+     */
+    protected function withMapMeta($key, $value)
+    {
+        $existingMapMeta = $this->meta['map'] ?? [];
+
+        return $this->withMeta([
+            'map' => array_merge($existingMapMeta, [
+                $key => $value,
+            ]),
+        ]);
+    }
+
+    /**
+     * Get component name.
+     *
+     * @return string
+     */
+    public function getMapFieldType()
+    {
+        return Str::kebab(class_basename($this));
+    }
+}

src/Marker.php

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+<?php
+
+namespace Lassehaslev\NovaMapFields;
+
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+class Marker extends MapField
+{
+    /**
+     * Create a new field.
+     * And set default properties.
+     *
+     * @param string      $name
+     * @param string|null $attribute
+     * @param mixed|null  $resolveCallback
+     */
+    public function __construct($name, $attribute = null, $resolveCallback = null)
+    {
+        $this->help('Drag the marker to change the point.');
+
+        parent::__construct($name, $attribute = null, $resolveCallback);
+    }
+
+    /**
+     * Set the latutude field.
+     *
+     * @param mixed $fieldName
+     *
+     * @return $this
+     */
+    public function setLatitude($fieldName)
+    {
+        return $this->withMeta([
+            'latitudeField' => $fieldName,
+        ]);
+    }
+
+    /**
+     * Set the longitude field.
+     *
+     * @param mixed $fieldName
+     *
+     * @return $this
+     */
+    public function setLongitude($fieldName)
+    {
+        return $this->withMeta([
+            'longitudeField' => $fieldName,
+        ]);
+    }
+
+    /**
+     * Resolve the attribute before sending to frontend.
+     *
+     * @param mixed      $resource
+     * @param mixed|null $attribute
+     *
+     * @return array
+     */
+    public function resolveAttribute($resource, $attribute = null)
+    {
+        return [
+            'lat' => $resource->{$this->meta['latitudeField']},
+            'lng' => $resource->{$this->meta['longitudeField']},
+        ];
+    }
+
+    /**
+     * Hydrate the given attribute on the model based on the incoming request.
+     *
+     * @param \Laravel\Nova\Http\Requests\NovaRequest $request
+     * @param string                                  $requestAttribute
+     * @param object                                  $model
+     * @param string                                  $attribute
+     */
+    protected function fillAttributeFromRequest(NovaRequest $request, $requestAttribute, $model, $attribute)
+    {
+        if ($request->exists($requestAttribute)) {
+            $latLng = json_decode($request[$requestAttribute]);
+
+            $model->{$this->meta['latitudeField']} = $latLng->lat;
+            $model->{$this->meta['longitudeField']} = $latLng->lng;
+        }
+    }
+}

src/Polyline.php

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+<?php
+
+namespace Lassehaslev\NovaMapFields;
+
+class Polyline extends MapField
+{
+    /**
+     * Create a new field.
+     * And set default properties.
+     *
+     * @param string      $name
+     * @param string|null $attribute
+     * @param mixed|null  $resolveCallback
+     */
+    public function __construct($name, $attribute = null, $resolveCallback = null)
+    {
+        $this->help('Click on the map to create a new point. Drag a marker to change the point. When the map is selected, you can press [backspace] to remove markers.');
+
+        parent::__construct($name, $attribute = null, $resolveCallback);
+    }
+
+    /**
+     * Resolve the attribute before sending to frontend.
+     *
+     * @param mixed      $resource
+     * @param mixed|null $attribute
+     *
+     * @return array
+     */
+    public function resolveAttribute($resource, $attribute = null)
+    {
+        return json_decode($resource->{$attribute});
+
+        return [
+            'lat' => $resource->{$this->meta['latitudeField']},
+            'lng' => $resource->{$this->meta['longitudeField']},
+        ];
+    }
+}