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Configuration

Table of Contents

Overview

The configuration used in the main application at https://worldview.earthdata.nasa.gov is built from the various JSON files found in the config/default directory.

To create a custom configuration simply copy the config/default directory to config/active and modify it's contents as needed. Any configuration found in here will be used instead of config/default.

To quickly switch between different configurations, use a symlink for config/active

Updating the Configuration

After making any changes to configuration files, rebuild the app for the changes to take effect. Use the npm run build command to make a request to the GIBS GetCapabilities API to update layer configurations and rebuild the configuration file used by the application. After a successful build, this file can be found at: build/options/config/wv.json

If you want to only rebuild wv.json, using GetCapabilities files that were previously requested, (e.g. if you are just modifying some configs locally and want to test your changes) you can simply run npm run build:config

Subdirectories

If you have a custom configuration in a subdirectory of config/ other than config/release/, pass in the name of the subdirectory to use like so:

CONFIG_ENV=subdirectory_name npm run build:config

Ignoring Build Errors

To build an incomplete configuration, ignoring build errors, prefix the command like this:

IGNORE_ERRORS=true npm run build:config

New Map Sources

Modify the sources.json file. Within this file there is a sources object that contains an object for each map source keyed by the source identifier. For layers that can be configured via a GIBS WMTS GetCapabilities document or for WMS layers, the only property required is url

  • url: Either a string or array of strings where the map service is found.
  • matrixSets: Only required for WMTS layers that cannot be configured with a GetCapabilities document. An object that contains an object for each matrix set, keyed by the matrix set identifier.
    • id: The identifier for this matrix set.
    • resolutions: Array of resolutions for each zoom level.
    • tileSize: Array of pixel dimensions for each tile. Example; [512, 512]

Example sources.json

config/default/common/config/wv.json/sources.json

{
  "sources": {
    "GIBS:arctic": {
      "url": "https://gibs-{a-c}.earthdata.nasa.gov/wmts/epsg3413/best/wmts.cgi",
      "matrixSets": {
        "EPSG3413_250m": {
          "id": "EPSG3413_250m",
          "maxResolution": 8192,
          "resolutions": [8192, 4096, 2048, 1024, 512],
          "tileSize": [512, 512]
        }
      }
    }
  }
}

GetCapabilities

To automatically fetch configuration information from the GetCapabilities document, modify the config.json file and add an object to the wv-options-fetch array with the following properties:

  • from: The URL to fetch the GetCapabilities document
  • to: Name of the temporary file used to store the GetCapabilities document.

Now add an object to the wv-options-wmts array with the following properties:

  • source: The identifier of the source that corresponds to this endpoint.
  • from: The name of the temporary file used int he wv-options-fetch object.
  • to: The name of the temporary output JSON file.
  • projection: The identifier of the projection used in this endpoint (see config/default/common/config/wv.json/projections)
  • maxResolution: The resolution of first tile matrix entry.

Example config.json

config/default/release/config.json

{
  "wv-options-fetch": [
    {
      "from": "https://gibs.earthdata.nasa.gov/wmts/epsg4326/best/wmts.cgi?request=GetCapabilities",
      "to": "gibs-geographic.xml"
    }
  ],
  "wv-options-wmts": [
    {
      "source": "GIBS:geographic",
      "from": "gibs-geographic.xml",
      "to": "gibs-geographic.json",
      "projection": "geographic",
      "maxResolution": 0.5625
    }
  ]
}