overview map broken

[gubuntu]

The overview map is supposed to show the whole country, not be zoomed in like this

this is on the hybrid map on the staging site.

check all the other maps too.

[seabilwe]

Problem

The overview map is supposed to show the whole country, not be zoomed in.

From what I can gather, the overview map is taking the extent of the layer in the map canvas, and not showing the full extent of South Africa. The Lizmap configurations for both staging and production are the same.

From this link: https://docs.lizmap.com/3.2/en/publish/advanced_lizmap_config.html, Lizmap is supposed to automatically take up the extent of the layer in the Overview group.

Here are some of the tickets I came across where individuals had a similar issue. https://github.com/3liz/lizmap-web-client/issues/686 https://github.com/3liz/lizmap-web-client/issues/692 https://github.com/3liz/lizmap-web-client/issues/768

Solution

https://gis.stackexchange.com/questions/88859/how-to-show-world-map-with-lizmap In this case, the extents for the both staging and production are the same as well. The group settings for the overview map in staging and production are the same.

Another alternative could be to remove the overview group in staging for all three projects and add it again to see if it will make a difference with fixing the extent.

[seabilwe]

Solution 2

Another alternative could be to remove the overview group in staging for all three projects and add it again to see if it will make a difference with fixing the extent.

I have used the alternative method, but the overview map remains in its zoomed extent (i.e., when viewing the staging site).

• The setting on both staging and production projects are the same.
• The configurations on Lizmap also remain the same.

@gubuntu @NyakudyaA

[seabilwe]

From what @NyakudyaA was able to find

The overview map is somehow linked to map scales defined in the project. As shown in the picture, this is with a final scale of, 45000000 defined in the scales.

With a max scale defined as, 250000 you are only able to preview the following

It seems they might have been some changes in the code in which overview maps are being interpreted. It could be that in prior versions the extent of the overview was being defined using the extent defined in the project properties in QGIS Server tab, but now it is linked directly to the maximum visible scale. So if your maximum scale is 5k you will never be able to see the full extent of SA because SA will look like a dot at that scale.

[gubuntu]

If it really is a change in LizMap code please log a bug report

[seabilwe]

Bug reported: https://github.com/3liz/lizmap-web-client/issues/2837

[NyakudyaA]

@gubuntu It seems like https://www.3liz.com/en/news/lizmap-web-client-3-5.html specifies that this change was sponsored and activated in lizmap 3.5. Should we keep it as it is or remove it considering that this won't change going forward

[gubuntu]

@NyakudyaA @seabilwe I think disable the overview map if you can't figure out a way to make it useful in our context

[gubuntu]

This is fixed so keep disabled until 3.5.3 deployed then re-enable

https://github.com/3liz/lizmap-web-client/issues/2837#issuecomment-1090100503

[seabilwe]

@NyakudyaA , if I'm not mistaken LizMap is now at 3.6.0, is it safe to add the overview map back again?

[NyakudyaA]

On staging, it should already be using a version that allows us to have the overview. I will also update staging to 3.6 and test if nothing is broken as well

[NyakudyaA]

![Uploading over-view.png…]()