This is a map of public trails and parks in Hawaii. Ultimately may serve as a template for adding various user-created map layers.

This is a very early work-in-progress, but feel free explore the repository. You need to create a ".env.local" file in your root directory, storing the following environment variables:

1. NEXT_PUBLIC_MAPBOX_TOKEN - MapBox API token
2. NEXT_PUBLIC_MAPSTYLE (if using custom map styles) - MapBox studio style url

• Format: mapbox://styles//
• Style gallery can be found at https://www.mapbox.com/gallery/

3. ATLAS_URI - MongoDB Atlas URI (only if you plan on pulling data from a database. Currently not necessary.)

When you have your environment variables set, you can run: npm run dev

1. Public trails

• EPSG 3857 (Spherical Mercator Projection) format
• http://honolulugis.org/arcgis/rest/services/Public/Parks_Recreation/MapServer//0

2. Park boundaries

• EPSG 3857 (Spherical Mercator Projection) format
• http://honolulugis.org/arcgis/rest/services/Public/Parks_Recreation/MapServer//22
• Description: Parks, open spaces, and outdoor recreational facilities managed and maintained by the City and County of Honolulu.
• Copyright Text: Honolulu Land Information System (Holis), Department of and Permitting, City and County of Honolulu

3. Park polygons statewide

• EPSG:3750 format
• https://geodata.hawaii.gov/arcgis/rest/services/Infrastructure/MapServer//16

**All data is converted to GeoJSON, EPSG 4326 format before becoming map layers

There are three ways to retrieve data. Typically you will use local JSON files provided in the public/data folder, but there are also options to use a MongoDB Atlas database or getting the raw data from the API.

1. handleLocalData - local JSON files can be found in public/data folder.
2. handleDatabase - Retrieves GeoJSON data from a MongoDB database. *Requires MongoDB Atlas account.
3. handleAPIData - Calls an API to retrieve ArcGIS data, converts it to GeoJSON format, then converts the geographic coordinates to EPSG:4326 (Equirectangular Projection) to return lat/lon values. Optionally, you can provide ".json" a second parameter to the handleData function, and then function will write a JSON file to the /public/data directory. *Requires API URLS (currently hidden/stored as environment variables).