distancelinepointqgis
I have two vector layers. One lines and the other points.
I am trying to find how far dots are apart from lanes, on average?
I am thinking about setting a buffer around the lines, and finding how many points would be in that buffer, but may be there are other simpler functions in QGIS
You can pass an array of layers to the select control
selectControl = new OpenLayers.Control.SelectFeature(
[lineLayer, pointLayer],
{
clickout: true, toggle: false,
multiple: false, hover: false,
toggleKey: "ctrlKey", // ctrl key removes from selection
multipleKey: "shiftKey" // shift key adds to selection
}
);
map.addControl(selectControl);
selectControl.activate();
See the openlayers documentation
To add different behavior for each layer, you could use the "featureselected" and "featureunselected" like in this example
EDIT
How to handle both click and hover control? I didn't try, but following this example should be done easily. Notice that the "hover" control is nothing else that a select control with 'hover': true. So, just add another control passing to it the array of layers.
I think that it might be easiest to do with ST_ShortestLine with PostGIS http://postgis.net/docs/ST_ShortestLine.html or with a similar ShortestLine function in Spatialite https://www.gaia-gis.it/gaia-sins/xmlBlob/spatialite-sql-latest.html.
You said you have only points but those functions can be used for other geometries as well.
Here is an example with Spatialite.
SELECT
shortestline(a.geometry,b.geometry) AS geometry,
a.rowid AS start,
b.rowid AS end
FROM
source_table a,
source_table b
WHERE
a.rowid < b.rowid;
Best Answer
Use the GRASS tool v.net.connect to create the nearest line from each point. You can access this from the Processing Toolbox.
Example:
Simple point and line layers
Run the said tool:
Hopefully, it will output another line layer containing lines connecting each point to its nearest line (network):
Use the Field Calculator on the output layer, create a new field and use the expression
$lengthto calculate the length of each line in your output layer, including those which connects the point.