@dlr-eoc/services-ogc

This library bundles our clients for OGC standards.

WPS

This is a client to communicate with WPS-servers. With it, remote procedures can be called, their status monitored and their results fetched. The service is intended to abstract away the differences between the versions of the WPS protocol. It currently supports both WPS 1.0.0 and WPS 2.0.0.

const c = new WpsClient('1.0.0', httpClient);
const exec$ = c.execute('http://testserver.com/wps', 'processId', inputs, outputDescriptions);
exec$.subscribe(results => console.log(results) );

OWC

This is a parser to read from / write to OWC files. OWC can be used to share information about a map-context (such as extent, visible layers, zoom, ...) across multiple clients. This parser converts to / from UKIS-specific datatypes, like UKIS-rasterlayers, UKIS-vectorlayers etc. The OWC format is written to be easily extendable. We made use of this capability by adding some UKIS-specific semantic information - this information is encoded in the interfaces found in the file eoc-owc-json.ts. For more details see OGC OWS Context

const context: IOwsContext = {
  bbox: [ -13.684, 28.7793, 61.088, 64.9085 ],
  descriptionURL: 'https://code-de.org',
  features: [{
      geometry: null,
      id: 'S3_OLCI_L2_LAN',
      properties: {
        active: false,
        dimensions: [{
            display: 'P1D',
            name: 'time',
            units: 'ISO8601',
            value: '2017-01-01/2017-01-01/P1D'
          }],
        groupName: 'products',
        offerings: [{
            code: 'http://www.opengis.net/spec/owc-geojson/1.0/req/wms',
            operations: [{
                code: 'GetMap',
                href: 'https://geoservice.code-de.org/Sentinel3/wms?TRANSPARENT=TRUE&LAYERS=S3_OLCI_L2_LAN&VERSION=1.1.1&REQUEST=GetMap&TILED=True&FORMAT=image%2Fvnd.jpeg-png&SERVICE=WMS',
                method: 'GET',
                type: 'image/vnd.jpeg-png'
              },{
                code: 'GetCapabilities',
                href: 'https://geoservice.code-de.org/Sentinel3/wms?VERSION=1.1.1&REQUEST=GetCapabilities&SERVICE=WMS',
                method: 'GET',
                type: 'application/xml'
              },{
                code: 'GetFeatureInfo',
                href: 'https://geoservice.code-de.org/Sentinel3/wms?VERSION=1.1.1&REQUEST=GetFeatureInfo&SERVICE=WMS',
                method: 'GET',
                type: 'text/html'
              }]
          }],
        title: 'Sentinel-3 OLCI - Level 2 Land Product',
        updated: '2019-02-15T13:23:28'
      },
      type: 'Feature'
    }],
  id: 'codede:sentinel:3035',
  logoURL: 'https://geoservice.dlr.de/static/logos/dlr.gif',
  projections: [{
      bbox: [ 2000000.0, 1000000.0, 6500000.0, 5500000.0 ],
      code: 'EPSG:3035',
      default: true,
      unit: 'm'
    }],
  properties: {
    abstract: '<strong>CODE-DE</strong> Sentinel1 and 2',
    author: 'Geoservice Manager',
    authors: [{
        email: '[email protected]',
        name: 'Geoservice Manager',
        role: 'PoC'
      }],
    categories: [{
        term: 'WMS'
      },{
        term: 'DLR'
      }],
    lang: 'en',
    layerGroups: [{
        collapsed: false,
        groupName: 'products',
        title: 'Products',
        type: 'checkbox'
      },{
        collapsed: false,
        groupName: 'overlays',
        title: 'Overlays',
        type: 'checkbox'
      },{
        collapsed: false,
        groupName: 'base',
        title: 'Basemaps',
        type: 'radio'
      }],
    links: null,
    publisher: 'German Aerospace Center (DLR)',
    title: 'CODE-DE Sentinel 1 and 2 (EPSG:3035)',
    updated: '2019-02-15T13:23:28'
  },
  type: 'FeatureCollection'
};

const service = new OwcJsonService();
for (const resource of service.getResources(context)) {
    for (const offering of resource.properties.offerings) {
        if (service.checkIfServiceOffering(offering)) {
            const operation = offering.operations[0];
            const rlayerOptions$ = service.createRasterLayerFromOffering(offering, resource, context, targetProjection);
            rlayerOptions$.subscribe((rlayerOptions: RasterLayer) => console.log(rlayerOptions) );
        }
    }
}

Jsonix

Parts of this library depend on jsonix. The current version of jsonix (3.0.0) does not build to ES2015. To still be able to use this library, we created a fork with some minor modifications. As soon as the main repository of jsonix has fixed its build problems (we're working on a pull-request) we can move from our fork back to the main repo.

CSW

This is a client for CSW servers (https://www.ogc.org/standards/cat). It supports all required CSW operations. Only a minimal set of parameters is expected to be passed to the client, freeing the user of the need to build potentially deeply nested structures as bodies for the CSW. All data is marshalled and unmarshalled to json by Jsonix. Note: currently, search in the GetRecords operation only works by passing a CQL string, not by passing an XML-tree.

Opensearch

This is a wrapper around the EOXC opensearch-client. While that package provides an OpensearchService, it does only allow searching through links of the results type, not through collection links. This wrapper instead exposes the packages search functionality, so that the user can decide for himself which search-url to use. This way a search entails more steps, but allows for more control, too.

Example:

  const osw = new OpensearchWrapperService();
  // step 1: parse description.xml for searchable urls
  osw.discover(osServerUrl).pipe(
      map((instance: OpenSearchService) => {
          const urls = osw.getUrls(instance);
          // step 2: select the url to search
          return urls[3];
      }),
      switchMap((url: OpenSearchUrl) => {
          // step 3: do the actual search. The possible search-parameters are described in the `URL` object.
          const parameters = {
              parentIdentifier: 'EOP:CODE-DE:S2_MSI_L1C',
              startDate: '2020-06-01T00:00:00Z',
              endDate: '2020-06-07T23:59:59Z',
          };
          return osw.search(url, parameters);
      })
  ).subscribe((results: OpenSearchResult | Response) => {
      expect(results).toBeTruthy();
  });

===

This library was generated with Angular CLI version 8.2.14.

WMS

While openlayers already has a decent WMS-client, it doesn't quite cover some operations fully. The service WMSService allows to make calls to a WMS's GetCapabilities, so that existing layers can be parsed automatically.

Code scaffolding

Run ng generate component component-name --project services-ogc to generate a new component. You can also use ng generate directive|pipe|service|class|guard|interface|enum|module --project services-ogc.

Note: Don't forget to add --project services-ogc or else it will be added to the default project in your angular.json file.

Build

Run ng build services-ogc to build the project. The build artifacts will be stored in the dist/ directory.

Publishing

After building your library with ng build services-ogc, go to the dist folder cd dist/services-ogc and run npm publish.

Running unit tests

Run ng test services-ogc to execute the unit tests via Karma.

Further help

To get more help on the Angular CLI use ng help or go check out the Angular CLI README.