[talk-au] Help - Node relocation

Fri Feb 18 04:54:45 UTC 2022

Well, it was showing for me too like in the screenshot when I looked at it at first.

But as I said, a Ctrl+F5 fixed that.

(Lisa, the technical explanation below isn’t really important to you)

Now, in this case, because I never looked at that area before, it can’t have been my local cache in the browser that was the problem.

Ctrl+F5 (instead of just F5) doesn’t just invalidate the cache in the local browser, it afterwards sends the requests to reload the data with a “do not cache” flag set in the HTTP header, this will in turn force the CDN to not just take the tile out of it’s cache but to go back to the actual render server to request an updated image.

This is exactly why I keep telling people to use Ctrl+F5 (instead of e.g. simply turning off caching in their browser, which wouldn’t cause the “do not cache” flag on requests to the CDN.

Also, in this case a single Ctrl+F5 directly loaded the updated tile, but sometimes you have to do it multiple times. The reason why it updated directly this time is because the render server already had the new tile rendered, so could hand it out directly. But if the render server gets a request for a tile that’s “dirty” (needs to be re-rendered) it will still return the dirty tile, but will either queue up the rendering of it or possibly push it up the queue if it already is queued for rendering. In that case it takes at least one additional request after the tile has been rendered to update the tile in the browser.

From: Stéphane Guillou via Talk-au <talk-au at openstreetmap.org> 
Sent: Friday, 18 February 2022 14:35
To: talk-au at openstreetmap.org
Cc: Stéphane Guillou <stephane.guillou at indie.host>
Subject: Re: [talk-au] Help - Node relocation

Hi Lisa

The tiles (i.e. the rendered images shown on openstreetmap.org) take a while to be updated, sometimes a couple of days. It is not immediate.

I assume that that's the issue here?

For example, I just removed a shop that closed down: https://www.openstreetmap.org/changeset/117545570

However, on the map, it still shows (at the time of writing): 

Note that I turned on the "layers > map data" option, which shows in blue the existing data in the database. As you can see, the database does not include the shop Campus News anymore, but it is still shown on the tile.

So if that's the issue, the image should update in the next few hours or days!

Cheers

On 18/2/22 14:16, Lisa wrote:

Thank you for such a quick response :)

When I go into Edit mode the old node that needs to be removed isn't displaying, but when I am not in edit mode I can see it?

Am I using the wrong method of editing it?

Or do I need to do something else?

TIA, Lisa

On Fri, Feb 18, 2022 at 2:59 PM stevea <steveaOSM at softworkers.com <mailto:steveaOSM at softworkers.com> > wrote:

On Feb 17, 2022, at 7:51 PM, Lisa <lisalatham20 at gmail.com <mailto:lisalatham20 at gmail.com> > wrote:
(a question)

Hi Lisa:  I'm assuming you are using the iD editor.  It seems you know the difference between the new node being correct and the old node "needing to go," you can click on a node and delete it like this:

Select the node with a single click,
Press and hold until a pop-right menu toggles off (usually to the right, might be to the left), let go of the mouse button,
Slide your finger pointer down to the bottom icon, the trash can icon, and when hovered over it, click.

You just deleted the node.

Happy mapping!

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