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Configuration

The Worldview app uses the official EOSDIS configuration. To create a custom configuration, clone the default configuration repo into the options/ directory and modify it:

git clone https://github.com/nasa-gibs/worldview-options-eosdis.git options

Or clone the the configuration template repo into the options/ directory and modify it:

git clone https://github.com/nasa-gibs/worldview-options-template.git options

Updating the Configuration

After making any changes to a custom configuration, rebuild the app for the changes to take effect. Use the npm run getcapabilities command to make a request to the GIBS GetCapabilities API and update layer configurations; then use npm run build:config to rebuild the configuration for use by the application. Run these commands separately as needed or use npm run updateconfig as a shortcut to run both.

Subdirectories

If you have a custom configuration in a subdirectory of options/ other than options/release/, pass in the name of the subdirectory to use with npm run build:config -- subdirectory_name. To build an incomplete configuration, prefix the command like this: IGNORE_ERRORS=true npm run build:config.

New Layers

Create a new JSON document in config/wv.json/layers named X.json where X is the layer identifier used in the WMTS or WMS API call. This file can be placed in any subdirectory as needed for organizational purposes.

Here's an example of a minimum configuration for the Aerosol Optical Depth layer:

{
  "layers": {
    "MODIS_Aqua_Aerosol": {
      "id": "MODIS_Aqua_Aerosol",
      "title": "Aerosol Optical Depth",
      "subtitle": "Aqua / MODIS",
      "group": "overlays"
    }
  }
}

All properties should be in an object keyed by the layer identifier used in the WMTS of WMS API call.

Required Properties

The minimum set of required properties are as follows:

  • id: The layer identifier used in the WMTS or WMS call
  • title: Title of the layer displayed to the end user. This is the first line displayed in the active layers list.
  • subtitle: Subtitle of the layer displayed to the end user. This is the second line displayed in the active layers list and usually includes platform, sensor, and/or attribution information.
  • group: The group this layer is found in, either baselayers or overlays
  • layergroup: A reference to the layer group the layer belongs to (usually the folder name it's contained in; i.e. airs, modis, reference_orbits).

The following properties are required if this information is not available via the GIBS WMTS GetCapabilities document:

  • type: Tile service type, either wmts or wms.
  • format: Image format type, either image/png or image/jpeg.
  • tileSize: For WMS layers only, an array of pixel dimensions used to tile the requests. For example, [512, 512]
  • period: Use daily for layers that have new content each day, otherwise use static.
  • startDate: For daily layers, the first day in YYYY-MM-DD format that data is available
  • inactive: If the daily layer is no longer being produced, this should be present with a true value. Otherwise, this property can be omitted.
  • endDate: If the daily layer is no longer being produced, the last day in YYYY-MM-DD format that data was available.

A projections object must exist which contains an object for each projection supported by this layer. Projection information is keyed by the projection identifier (found in config/wv.json/projections). Example:

"projections": {
  "antarctic": {
    "source":     "GIBS:antarctic",
    "matrixSet":  "EPSG3031_250m"
  },
  "arctic": {
    "source": 	"GIBS:arctic",
    "matrixSet":  "EPSG3413_250m"
  }
}

The projection parameters are as follows:

  • source: Identifier that indicates which endpoint contains this layer (see config/wv.json/sources.json)
  • matrixSet: For WMTS layers only, the name of the matrix set as defined in the endpoint's GetCapabilities document.

Layer Order

The config/wv.json/layerOrder.json file must be updated to include the new layer identifier. This file determines the order that layers are displayed in the add layers tab.

Optional Properties

  • tags: Additional text used for matching this layer when searching in the add layers tab. This allows Aerosol Optical Depth layers to match when "aod" is typed in
  • noTransition: For WMTS layers only, if set to true, the map will not display lower-resolution tiles while loading.
  • transition: For WMS layers only, if set to true, the map will display lower-resolution tiles while loading.
  • product: Identifier of the product to use when searching the Common Metadata Repository (CMR) to download data. See the Data Download documentation for more information.
  • style: For WMTS layers only, this sets the WMTS style parameter accordingly; defaults to default if not set.
  • matrixIds: For WMTS layers only, this is an array of labels used for the TileMatrix parameter at each zoom level; defaults to [0, 1, 2, ...] if not set.
  • daynight: Classify a layer as day or night. This information will be displayed within the title of the layer in the Measurement / Sources add modal view if provided.
  • track: Classify a layer's track direction. This will usually be either ascending or descending and will be displayed within the title of the layer in the Measurement / Sources add modal view if provided.
  • description: Point to a markdown file within the metadata folder to provide a layer description.

To display a color palette legend, a palette object should exist with the following properties:

  • id: Identifier of the palette. This should match the name of the colormap file without the extension.
  • recommended: Array of custom palette identifiers that are recommended for use with this layer (see config/palettes-custom.json). Example, ["orange_1", "red_1"]
  • immutable(optional): When this flag is set to true, the options to adjust thresholds and colormaps are removed.

Full Example

{
  "layers": {
    "AIRS_RelativeHumidity_400hPa_Day": {
      "id": "AIRS_RelativeHumidity_400hPa_Day",
      "title": "Relative Humidity (400 hPa, Day)",
      "subtitle": "Aqua / AIRS",
      "tags": "rh",
      "group": "overlays",
      "product": "AIRX2RET_DAY",
      "format": "image/png",
      "type": "wmts",
      "period": "daily",
      "startDate": "2013-07-16",
      "projections": {
        "geographic": {
          "source": "GIBS:geographic",
          "matrixSet": "EPSG4326_2km"
        }
      },
      "layergroup": [
        "airs"
      ],
      "daynight": "day",
      "track": "descending",
      "palette": {
        "id": "AIRS_RH400_A"
      }
    }
  }
}

Adding Layers to Worldview and the Product Picker

New layers in the Global Imagery Browse Services (GIBS) can be added to Worldview via the options repository using the following instructions.

First, layers must be added to config/wv.json/layers and config/wv.json/layerOrder.json. Then they must be added to the config/wv.json/measurements and config/wv.json/categories folders so that they will be categorized in the Product Picker. Lastly, if the layers have descriptions these can be added in config/metadata and if they are available in the Common Metadata Repository (CMR), data download may be enabled for those layers.

  • Fetch GIBS GetCapabilities with npm run getcapabilities. This gets the latest layer information and colormaps from GIBS.
  • Add new layer(s)
    • Follow New Layers above to create JSON file in config/wv.json/layers.
  • Add to Measurements
    • Add to relevant measurement or create a new JSON file in config/wv.json/measurements.
  • Add to Categories
    • Add to relevant category (legacy (a.k.a. hazards and disasters) and scientific) or create a new JSON file in the relevant category in config/wv.json/categories.
  • Add to Layer Order
    • Add to config/wv.json/layerOrder.json.
  • Add layer to Image Download
    • Contact GIBS team to add layers to Image Download
  • Add Layer descriptions/metadata, if it exists
    • Create .md file in config/metadata. The description (i.e. layer description/metadata) identifier has to be added to the corresponding measurement JSON file.
  • Add Data Download for product, if it exists
    • Refer to Data Download and create JSON file in config/wv.json/products. The product identifier has to be added to the corresponding layer JSON file.
  • Rebuild the configuration with npm run build:config for use by the application.

New Map Sources

Modify the JSON document, config/wv.json/sources.json. 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: Either a string or array of strings where the map service is found.

For WMTS layers that cannot be configured with a GetCapabilities document, a matrixSets object must exist that contains an object for each matrix set, keyed by the matrix set identifier.

  • id: The identifier for this matrix set.
  • maxResolution: The maximum resolution of this of this matrix tile set as defined in the OpenLayers 2 documentation. This property might be deprecated in the future as it can be obtained from the resolutions property.
  • resolutions: Array of resolutions for each zoom level as defined in the OpenLayers 2 documentation.
  • tileSize: Array of pixel dimensions for each tile. Example; [512, 512]

Full Example

{
  "sources": {
    "GIBS:arctic": {
      "url": [
        "//map1a.vis.earthdata.nasa.gov/wmts-arctic/wmts.cgi",
        "//map1b.vis.earthdata.nasa.gov/wmts-arctic/wmts.cgi",
        "//map1c.vis.earthdata.nasa.gov/wmts-arctic/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 object 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 object 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/wv.json/projections)
  • maxResolution: The resolution of first tile matrix entry.

config.json Example

{
  "wv-options-fetch": [
    {
      "from": "https://map1.vis.earthdata.nasa.gov/wmts-geo/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
    }
  ]
}