@geovara/core

The core GIS engine for Geovara applications. This package is framework-agnostic and provides a high-level abstraction over OpenLayers and Turf.js.

Features

• Map Engine: Single-function map initialization and state management.
• Layer Management: Simplified API for adding/removing layers and controlling visibility/opacity.
• Interactions: Pre-configured interaction wrappers (Select, Draw, Modify, Drag & Drop).
• Spatial Analysis: Geometric operations (Buffer, Centroid, Intersect) powered by Turf.js.
• Data Transformation: Support for GeoJSON, KML, KMZ, and TopoJSON formats.
• Advanced Tools: Built-in helpers for Geolocation and Measurements.

Installation

pnpm add @geovara/core

Note: ol is a peer dependency and must be installed in the host application.

Usage Example

import { createMap, addLayer, SpatialService } from '@geovara/core';

// Initialize map
const map = createMap({
  target: 'map-container',
  center: [106.8272, -6.1751], // Jakarta
  zoom: 12
});

// Add a GeoJSON layer
addLayer(map, {
  id: 'my-layer',
  type: 'geojson',
  data: myGeoJSONData
});

// Perform spatial analysis
const buffered = SpatialService.createBuffer(myFeature, 500, 'meters');

Modular Structure

• /map: Core map initialization.
• /layer: Layer and basemap management.
• /interaction: OL interaction wrappers.
• /events: Map event bus.
• /spatial: Turf.js-based geometric operations.
• /format: Custom formatters (e.g., TopoJSON).
• /export: Multi-format data export.
• /import: Data import transformation.
• /geolocation: Geolocation tracking utilities.
• /measurement: Distance and area measurement tools.