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Thread: error acedss denied reverse geocode

  1. #1

    Thread Starter
    PowerPoster
    Join Date
    Mar 2005
    Posts
    2,944

    error acedss denied reverse geocode

    Code:
    Sub Getadress()
        
        Dim myURL As String
        Dim lat As String
        Dim lon As String
        Dim txt As String, test As String
        
        lat = "40.848641"
        lon = "14.225083"
        
        
        myURL = "http://nominatim.openstreetmap.org/reverse?format=xml&lat=" & lat & "&lon=" & lon & "&addressdetails=1"
        Debug.Print myURL
        Dim WinHttpReq As Object
        Set WinHttpReq = CreateObject("Microsoft.XMLHTTP")
        WinHttpReq.Open "GET", myURL, False
        
        WinHttpReq.send<<<<<<<<<<<<<error here
        
        If WinHttpReq.Status = 200 Then
            txt = WinHttpReq.responseText
            test = getfield(txt, "road") & getfield(txt, "postcode") & getfield(txt, "village") & getfield(txt, "country")
            Debug.Print test
        End If
        
    End Sub

  2. #2
    PowerPoster Arnoutdv's Avatar
    Join Date
    Oct 2013
    Posts
    6,748

    Re: error acedss denied reverse geocode

    Maybe you are blocked because of to many requests?
    https://operations.osmfoundation.org...ies/nominatim/

    Google AI answer:
    Getting an access denied (403 Forbidden) error on nominatim.openstreetmap.org means your IP or application was blocked, usually for violating the free usage policy. The public, volunteer-run server strictly prohibits auto-complete (on-type) searching, bulk geocoding, and requires a valid User-Agent.

    Why You Were Blocked
    • Missing/Generic User-Agent: Requests without a custom User-Agent (or using generic strings like python-requests or axios) are immediately rejected.
    • Auto-Complete/Typing Requests: Firing a query for every keystroke is strictly forbidden.
    • Overuse: The public endpoint caps limits at 1 request per second. Bulk data processing or exceeding this speed will trigger a block.


    How to Fix & Unblock Access
    Blocks placed on the public server typically clear automatically within a few hours to 24 hours. To resume access, you must follow the Nominatim Usage Policy:
    • Set a Custom User-Agent: You must identify your application. Include your app name and a valid contact email in the request header (e.g., MyApp/1.0 ([email protected])).
    • Throttle Your Requests: Ensure your system pauses for at least 1 second between requests.
    • Cache Results: Save geocoded coordinates in your local database so you don't repeatedly query for the same address.



    Production & Bulk Alternatives
    The nominatim.openstreetmap.org server is only meant for light development and testing. If you are building a commercial application, handling high-volume queries, or deploying a live website, you must switch to a production-ready alternative:
    • Commercial Geocoders: Use a hosted provider like LocationIQ, Geocodio, or TomTom.
    • Self-Hosting: Deploy your own instance of Nominatim using Docker and your own OpenStreetMap planet extract for unlimited, high-speed geocoding.

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