New answers tagged openlayers
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The solution I adopted isn't working because putting the self intersection check on the condition doesn't always lead to check for a complete Polygon feature (until the drawing is finished the feature is of type MULTILINESTRING). What I did was to put the self-intersect checks on the drawend, the feature will be added to the layer anyway and I handle ...
1
Using turf.js#intersect method you can find out if two features share a border.
from their docs:
Takes two polygons and finds their intersection. If they share a border, returns the border; if they don't intersect, returns undefined.
Using this, you can convert open layer features to turf.js#polygonand feed them to the intersect method. If the return ...
1
You can select the geometries on front end using openlayers and then write a postgres query to check if they intersect with each other by using ST_Intersects and apply ST_UNION if the intersects is true. This works if the backend is postgres. If you use any other DB, use appropriate spatial queries and return the result to front-end for providing appropriate ...
3
OpenLayers passes the extent in view projection units so you should use that if your server supports it (otherwise you would need to transform the extent to EPSG:4326)
url: function (extent, resolution, projection) {
return 'http://localhost:8080/geoserver/misproject/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=misproject%...
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For anyone facing this problem in the future I got to the bottom of it. The problem was that I was adding multiple interactions at the same time - i.e. Modify, Translate, and Select.
I saw this issue only selecting points and lineStrings while all the interactions were active. If I only use the interactions one at a time (although Translate and Select seem ...
3
here's a solution using proj4js:
Demo
I put some transparency to check the alignment, you can remove it in the options of the WMTS layer (set opacity to 1).
Code :
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
})
],
view: new ol.View({
...
1
In qgis2web.js, set the default view in the map and remove/comment the line after the map definition :
var map = new ol.Map({
controls: ol.control.defaults({attribution:false}).extend([
expandedAttribution
]),
target: document.getElementById('map'),
renderer: 'canvas',
overlays: [overlayPopup],
layers: layersList,
view: ...
3
To open the view at those coordinates at zoom 10 use
view: new ol.View({
maxZoom: 18,
minZoom: 4,
center: ol.proj.fromLonLat([-74.006998, 40.722120]),
zoom: 10
})
EPSG:3857 is the OpenLayers default projection so need not be specified. You must convert Lon/Lat values to view projection coordinates (methods beginning OpenLayers. were used ...
1
The map file is correct. In OpenLayers, you have created a tile layer and its source is tileWMS, that's why you are getting WMS. to get WFS,
africa_wfs_source = new ol.source.vector({
format : new ol.format.GeoJson(),
url: function(extent) {
return 'http://*****/cgi-bin/mapserv?
map=/data/mapFile/South.map&service=WFS&' +
...
1
If you take a look at actual GeoJSON data, you'll see that it's coded in EPSG:4326, so reading features statement should be:
var features = (new ol.format.GeoJSON()).readFeatures(data.geometry, {dataProjection: 'EPSG:4326', featureProjection: 'EPSG:27700'});
You'll also have to change order of layers in map declaration, otherwise features will be covered ...
1
After analyzing the map initializer, I noticed that I was setting the minZoom attribute in my map view. After removing it, I now get the same value of mapView.getMaxResolution ().
Conclusion: The minZoom and maxZoom attributes influence the formula
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The popup was appearing blank because of CORS error and I fixed it by adding Moesif CORS extension to chrome browser. Now, the above code works as expected. Hence,I am marking this as answer.
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My approach was to abandon labels (set all layers in QGIS to have no labels (double click on layer in the Layer Panel to open Layer Properties > Labels > No Labels)), and focus on the popups, which are very nice and comparatively easy to deal with for a non-programmer.
I did see there are some Leaflet label plugins (though am not finding them now), but ...
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