Geocoding API for the Netherlands: BAG-quality OSM data

Geocoding in the Netherlands presents a unique challenge due to its specific address format and the high density of urban areas. Dutch addresses typically consist of a street name followed by the house number, and often include an addition letter for sub-addresses. With the combination of a highly specific postal code format—four digits followed by two letters, and then the city—accuracy is paramount for applications relying on geocoding, making it essential to choose a provider with robust data coverage and infrastructure.

Geocoding coverage in Netherlands

Maps' OpenStreetMap (OSM) data coverage in the Netherlands is excellent. The country's rich geographical data is underpinned by the Dutch address registry (BAG dataset), which is well-represented in OSM due to the active contributions from local mappers. Urban areas, where the majority of the population resides, offer particularly strong coverage, ensuring developers have reliable data for applications targeting cities and metropolitan areas. While rural coverage may have some minor gaps, the overall data quality establishes OSM as a compelling choice for technical Dutch startups that value not only data accuracy but also cost-effectiveness.

This strong data foundation provides a significant differentiator for businesses operating in the Netherlands, where startups are often technical and price-sensitive. With Mapsi, developers can leverage this robust coverage to build applications that deliver precise geocoding functionalities, tailored specifically to the needs of the Dutch market.

Address formats and geocoding accuracy

In the Netherlands, addresses are formatted as "Street name + house number (+ addition letter for sub-addresses), 4-digit postcode + 2-letter suffix + city." For instance, "Prinsengracht 263-267, 1016 GV Amsterdam" reflects the standard structure. Mapsi's geocoding API is fully optimized to handle this specific format, ensuring high accuracy in responses. Developers should keep in mind that the addition letter for sub-addresses is crucial for distinguishing nearby buildings with similar primary addresses.

GDPR and data residency

As Mapsi is hosted on Hetzner within the EU, all geocoding requests and results are processed within the European Union. This means that applications handling personal data, such as delivery addresses or user locations, can remain compliant with GDPR regulations without the need to navigate complex international data transfer issues. This is in stark contrast to US-based providers like Google Maps or Mapbox, where data may be processed outside the EU, potentially resulting in compliance headaches for developers focused on user privacy.

Latency from Netherlands

With latency typically under 30ms from the Netherlands to our Hetzner servers in Frankfurt, developers can expect fast responses from the Mapsi Geocoding API. This low latency is essential for real-time applications and ensures a smooth user experience, especially in tightly packed urban environments where speed and accuracy matter most.

Getting started: geocoding a Netherlands address

To get started with geocoding a Dutch address using Mapsi, you can use the following cURL example. Here, we’ll geocode a well-known address in Amsterdam:

curl -X GET "https://api.mapsi.dev/v1/geocode?address=Prinsengracht%20263-267,%201016%20GV%20Amsterdam"

This request will return geocoding data relevant to the specified address, ensuring you have accurate geographical information at your fingertips.

Frequently asked questions

curl "https://api.mapsi.dev/geocode?q=Berlin&key=YOUR_KEY"