QGIS » QGIS Application

Sorry, I don't see the red square but I am not able to confirm what you report, to edit nodes and select you have to click on the appropriate layer in the list of layers, I could move the nodes without issues and I couldn't reproduce.

Uh??? Well here is another illustration. I have used the selection tool to select the polygon which is filled with red (the selection colour of my project). I now try to click on the top right corner (node) of that polygon. Instead of that, what is being selected is the line shown in blue which is the side of a different polygon.

At the least it should be possible to select the nodes of the currently selected polygon, if there are several which are close together.

Patrick Dunford wrote:

And another thing, I want someone to tell me what is happening here because this is incredibly frustrating as well... I have clicked on one vertice (node) and it decides to move two instead of one. This happens sometimes quite often regardless.

This happens if you click on the segment instead of the node. Then both extremities of the segment are selected and moved together. I often do that by mistake as well, I agree the UI is not very good.

I had a look at your shapefiles and I can't reproduce the issue. I agree with Giovanni that a screencast would be very useful to see where is the problem.

edit: I think I see your problem: when a polygon has already been selected, you cannot select another one by clicking "too close" of the first one. However, this "too close" is not affected by the zoom, so can give counter-intuitive results. I will look into it.

The issue is due to rounding happening when selecting features and snapping nodes.

In the short term, I would advise to choose a projected coordinate refrence system instead of WGS84 to work on such large scale data. This should solve your problems as you would be working in meters instead of degrees, giving more reasonable numbers to work with. If it is not possible, try to zoom out when selecting new features and nodes, this will help a bit.

However, I agree that there are bugs in the way QGis deals with these level of zoom and and these small distances. If they are available, all QGis features should work as expected.

Thanks that last response.
If the layers you get come in WGS84 coordinates, how do you change the coordinates into some other system?

Patrick Dunford wrote:

Thanks that last response.
If the layers you get come in WGS84 coordinates, how do you change the coordinates into some other system?

activate the reprojection in project properties and select a cartographic CRS, or use the "save as..." function to create copies of your layers in a projected CRS.

I would suggest to close this ticket.