Bug report has been made
#35831
On 2020-04-17 12:58 p.m., Nicolas Cadieux wrote:
Hi,
Small correction,
If you extract the end nodes (vertices) of the line, you can use the
following rule. End node layer must be covered by endpoints of line
layer or node layer must be covered by line. I therefore assume the
QGIS topology checker can work for endnode only and not for "middle
node" of the line. This is should be reported as a bug I think.
Nicolas
On 2020-04-17 12:42 p.m., Nicolas Cadieux wrote:
Hi Marshal,
I looked at your data. The first problem is that none or your line
nodes intersect with a point. It looks close... but it's not close
enough. By using "snap geometry location", I was able to create a
new line that snaps to your point. (called Topologie snapped_line in
the file I will send you in private). A "Select by location" or a
"Join Attributes by location" confirms that the points now intersect
the Topologie snapped line layer. The Join Attributes by location
will permit you to find the problems as you can discard records that
do not intersect. This will give you what you want.
As for the topology Checker, it seems that a line cannot cover a
point or a point cannot cover a line even if point and line nodes
intersect (Can someone confirm this?). I can only assume that QGIS
works with the correct assumption that a point and a line does not
have a surface to cover and therefore, cannot cover anything. I
assume, based on your observations that ESRI does not follow that
assumption.
You can however create a 1 m buffer around your line (Topologie
Buffered_line in the file). Then, you can create the rule (polygon
must contain point). That rule will work in the topology Checker.
Cheers!
Nicolas
On 2020-04-13 10:25 a.m., Nicolas Cadieux wrote:
Hi,
I don’t have QGIS in front of me. I looked around on the the net
and was surprised to see the «covered By » option for points and
lines. Unless a line is snapped, or intersects a point exactly on a
Line node, it’s just about impossible to calculate if a line «
covers » a point. This is something easy to do with a polygon but
not a line because of float point precision error. You could buffer
the lines and see if that helps. You could create a 1m buffer on the
line (or the point). Make sure both layers are in the same crs so
that additional calculations don’t need to be done.
You could at the « select by location » side. I would look at «
snap with » or «intersects with »options.
Nicolas Cadieux
Ça va bien aller!
Le 13 avr. 2020 à 06:11, Marshal Mappers <[email protected]>
a écrit :
Hello everyone,
I want to use the topology checker to check if point features are
covered by line features. For example are the bus stops covered by
the bus lines.
Therefore I use the topology checker with the following rule:
"points" must be covered by "lines". But I get the error for all
points that "point is not covered by segment".
I even get the error for points that I edited on the line with
snapping.
Here my questions:
1. Is it possible to check if point features are covered by line
features? With topology checker? In general?
2. What does the rule: "points" must be covered by "lines"check?
Under what cicumstances is a point feature covered by a line feature?
I tried this in QGIS Versions 2.18.26; 3.4.15; 3.10.2
My OS ist Windows 10
I tried with shapefiles and geopackage layers
The CBS of point and line layers are the same. Here I tried the
coordinate systems with epgs: 31468 (DHDN / 3---degree Gauss-Kruger
zone 4) and 25832 (ETRS89 / UTM zone 32N).
If anyone could explain or point me to the right direction, that
would be awesome.
Thank you!
Best regards
Marshal
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