North Holland Province geoservices (ArcGIS REST)

Base URL

https://geoservices.noord-holland.nl/ags/rest/services

Endpoints 9

• GET?f=jsonDirectory: version, folders and services (name + type).
• GET/{map}?f=jsonServices in one folder.
• GET/{dienst}/MapServer?f=jsonService: layers and tables (id, name, group layer or not), maxRecordCount, capabilities, projection, description.
• GET/{dienst}/MapServer/{laag}?f=jsonLayer: fields (name, type, alias, length), geometry type, maxRecordCount, supportedQueryFormats and advancedQueryCapabilities (pagination, statistics, orderBy, distinct).
• GET/{dienst}/MapServer/{laag}/queryQuery features with a where clause or spatial filter; also count (returnCountOnly) and group (outStatistics). Response in JSON, GeoJSON or PBF.
• GET/{dienst}/MapServer/legend?f=jsonLegend per layer: labels and symbols (PNG as base64).
• GET/{dienst}/MapServer/export?bbox=…&bboxSR=4326&size=600,400&format=png&f=imageMap image as PNG for a rectangle; with f=json you get a link to the image. Without bbox: error 'bbox must be specified'.
• GEThttps://geoservices.noord-holland.nl/ags/services/{map}/{dienst}/MapServer/WMSServer?request=GetCapabilities&service=WMSWMS 1.3.0 of the same MapServer: path without /rest/ and with /WMSServer. Only for services whose supportedExtensions lists WMSServer.
• GEThttps://geoservices.noord-holland.nl/ags/services/{map}/{dienst}/MapServer/WFSServer?service=WFS&request=GetCapabilitiesWFS 2.0 of the same MapServer (only if supportedExtensions lists WFSServer); GetFeature with outputFormat=GEOJSON.

Filtering platform

SQL-like where clause on the layer's fields, plus an optional spatial filter (geometry). Group and count with outStatistics.

Parameters 13

Fields of the example layer 10 · oi_op/oi_dataportaal_geoweb/MapServer/23 (66 zonneparken)

Limits and pitfalls

• At most 1.000 tot 2.000.000 (oi_dataportaal_geoweb: 2.000.000; per laag nakijken) features per response (the layer's maxRecordCount; varies per layer, see /{layer}?f=json). If there are more, the response has exceededTransferLimit: true: fetch the rest with resultOffset and resultRecordCount. tested
• No key and no documented rate limit. Take it easy (a few requests per second) and prefer statistics or counts over fetching all features. experience
• Note /ags/ in the address (not /arcgis/). WMS and WFS are at /ags/services/…/MapServer/WMSServer and /WFSServer, only for services whose supportedExtensions list them (oi_dataservice_alg: both; oi_dataportaal_geoweb: WFS only). tested
• On 16 Oct 2026 around 23:30 every query on oi_dataservice_alg returned 'Underlying DBMS error [no connection to the server]' (with HTTP 200), while other services worked. Individual services can be down temporarily. tested
• Errors come back with HTTP 200 and a JSON object {"error": {"code": 400, …}} ('Failed to execute query.' for an unknown field in where). Always check for an error field, not just the status code. tested
• Numbers are sometimes stored as text (Zonneparken: geschatte_vermogen_mw '0.08'): sum in outStatistics then fails. Count or group on text fields, do the arithmetic yourself. tested
• The same layer appears in several collection services (oi_dataportaal_geoweb, oi_dataservice_alg, thematic atlas services). Deduplicate on layer name and fields. experience
• Dates only sometimes appear in the service description ('published by script on 07-07-2025 16:05:15'); otherwise no editingInfo. experience
• Group layers (with subLayerIds) have no query; query the leaf layers below them. Raster layers have no fields and no count. platform

Try it HTTP 200 · 411 ms · 16 Oct

https://geoservices.noord-holland.nl/ags/rest/services/oi_op/oi_dataportaal_geoweb/MapServer/23/query?where=1%3D1&outStatistics=[{"statisticType"%3A"count"%2C"onStatisticField"%3A"objectid"%2C"outStatisticFieldName"%3A"n"}]&groupByFieldsForStatistics=categorie&orderByFields=n DESC&f=json

{
  "displayFieldName": "",
  "fieldAliases": {
    "categorie": "categorie",
    "n": "n"
  },
  "fields": [
    {
      "name": "categorie",
      "type": "esriFieldTypeString",
      "alias": "categorie",
      "length": 200
    },
    {
      "name": "n",
      "type": "esriFieldTypeBigInteger",
      "alias": "n"
    }
  ],
  "features": [
    {
      "attributes": {
        "categorie": "Zonnepark op veld",
        "n": 59
      }
    },
    {
      "attributes": {
        "categorie": "Zonnepark op parkeren",
        "n": 7
      }
    }
  ]
}

Shortened response, saved at harvest time. Click the URL for the real, current response.