Leaflet WMS Tile Layer bounds set - leaflet

I want to limit my wms tile layers with a region. I saw a parameter in the WMSTileLayer bounds, however it can't be usable it always gives an error lat long.
TypeError: Cannot read property 'lat' of undefined
It looks like wms tile layer not overlapping with coordinates. I set the srs option such a below
<WMSTileLayer
layers={tile.layer}
format='image/png8'
version='1.3'
url={tile.url}
tiled={true}
bounds={tile.bounds}
time={tile.date}
transparent={true}
zIndex={tile.zIndex}
srs={CRS.EPSG4326}
/>
and bounds
bounds: [
[27.5, 37.5],
[28.24, 37.9]
]
Geoserver configuration can be shown in the image.
Thanks for your help.

WMSTileLayer inherits from L.TileLayer, which inherits from L.GridLayer. The bounds option is an instance of L.LatLngBounds, but you have it as an array of numbers. You need to construct a latLngBounds from your bounds:
const { bounds } = tile
// bounds:
// [
// [27.5, 37.5],
// [28.24, 37.9]
// ]
const latLng1 = L.latLng(bounds[0]);
const latLng2 = L.latLng(bounds[1]);
const myLatLngBounds = L.latLngBounds(latLng1, latLng2);
Now you can use that in the bounds prop of the WMSTileLayer:
<WMSTileLayer
...
bounds={myLatLngBounds}
...
/>

Related

How to define starting grid position on Leaflet's TileLayer?

My app needs to show a map within a box defined by
const corner1 = L.latLng(5.21244812011719, -96.5979537963867);
const corner2 = L.latLng(34.086555480957, -55.4220504760742);
const map = L.map(el,
{
crs: L.CRS.EPSG4326,
center: [19.6875, -76.201171875],
zoom: 3.5,
maxBounds: new L.latLngBounds(corner1, corner2),
});
L.tileLayer.wms("http://localhost:8080/wms?", {
layers: 'xxx',
tileSize: 700,
transparent: true,
maxBounds: new L.latLngBounds(corner1, corner2),
bounds: new L.latLngBounds(corner1, corner2)
}).addTo(map)
The thing is that the layer is requesting the tiles starting outside the borders defined (for example, this request was made http://localhost:8080/wms?&service=WMS&request=GetMap&layers=Mano%3AT22&styles=&format=image%2Fjpeg&transparent=true&version=1.1.1&maxBounds=%5Bobject%20Object%5D&time=2018-05-02T00%3A00%3A00.000Z&width=700&height=700&srs=EPSG%3A4326&bbox=-87.71484375,28.4765625,-56.953125,59.23828125 the bbox was -87.71484375, 28.4765625, -56.953125, 59.23828125, this contains the corners defined by me but is not optimal as it is requesting a map area that is not going to be seen on my app)
I need that leaflet request tiles that do not exceed the corners defined. How can I archieve that? Thanks in advance

Mapbox GL JS: zoom to filtered polygon?

I am using Mapbox GL JS to display a polygon layer. I would to allow the user to choose a name from a dropdown, and then highlight and zoom to the matching polygon.
I already know how to highlight the matching polygon using map.setFilter, but I don't know how to zoom to the bounds of the matching polygon. This is my current code:
map.addLayer({
'id': 'polygon_hover',
'source': 'mysource',
'source-layer': 'mylayer',
'type': 'fill',
'paint': {
'fill-color': 'red',
"fill-opacity": 0.6
},
"filter": ["==", 'CUSTNAME', ""]
});
// Get details from dropdown
custname.on("change", function(e) {
// get details of name from select event
map.setFilter('polygon_hover', ["==", 'CUSTNAME', name]);
// Get bounds of filtered polygon somehow?
// var bounds = ??;
// map.fitBounds(bounds);
});
I have examined the Mapbox example of zooming to bounds, but it assumes that you already know what the bounds are.
Is there any way it's possible to get the bounds of the polygon matching a map filter in Mapbox?
I've the following code to fitBounds to Polygon center coords:
var coordinates = f.geometry.coordinates[0];
var bounds = coordinates.reduce(function (bounds, coord) {
return bounds.extend(coord);
}, new mapboxgl.LngLatBounds(coordinates[0], coordinates[0]));
map.fitBounds(bounds, {
padding: 20
});
Where f is one Feature.
I found a solution to your problem. Leaflet has a polygon Class which takes an Array of polygon coordinates and has a function called getBounds() that returns south west and north east bounds. However, Leaflet doesn't follow the convention of LngLat, its format is LatLng. Therefore, you have to switch it. I took an example out from Mapbox Show drawn polygon area, and added exactly what you're looking for.
var polygon = data.features[0].geometry.coordinates;
var fit = new L.Polygon(polygon).getBounds();
var southWest = new mapboxgl.LngLat(fit['_southWest']['lat'], fit['_southWest']['lng']);
var northEast = new mapboxgl.LngLat(fit['_northEast']['lat'], fit['_northEast']['lng']);
var center = new mapboxgl.LngLatBounds(southWest, northEast).getCenter();
// map.flyTo({center: center, zoom: 10});
map.fitBounds(new mapboxgl.LngLatBounds(southWest, northEast));
I see that the question is still relevant - I solved it making a separate request to the database containing all points of a given polygon and building bounds [[minLng, minLat], [maxLng, maxLat]].
All attempts to address geometry of already rendered or source features didn't work for me - most probably because Mapbox doesn't keep initial geoJSON in the tiles.

How to draw a path between two nodes using Leaflet

I have a set of lat and long points which form a route from source to destination. I have used polyline method of Leaflet to draw the path between the source to destination, but it gives a scrambled path.
var firstpolyline = new L.polyline(latlong, {
color: 'red',
weight: 3,
opacity: 0.5,
smoothFactor: 1
});
firstpolyline.addTo(mym[![enter image description here][1]][1]ap);
The latlong in the above code is an array of latitude and longitude points. But it gives a scrambled output like this:
imgur.com/aZrGa.jpg
But the latlong points form a single correct path from source to destination. I have been using polyLine. What mistake am I doing? Should I use some other methods of Leaflet?
Edit after #ivansanchez comment
The latlong arrays are of type L.LatLng(x,y) where L is the Leaflet object. Here is a snippet:
1. var mymap = L.map('mapid').setView([17.387140, 78.491684], 13);
2. L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
attribution: "© <a href='http://osm.org/copyright'>OpenStreetMap</a> contributors"
}).addTo(mymap);
3. var latlngs = [
[15.89625,80.53544],
[15.89626,80.53542],
[15.89628,80.53536],
[15.89617,80.53539],
[15.89621,80.53547]
];
4. var path = L.polyline.antPath(latlngs,{"delay":400,"dashArray":[10,20],"weight":5,"color":"black","paused":true,"reverse":false}
).addTo(mymap);
5. mymap.addLayer(path);
mymap.fitBounds(path.getBounds());
EXPLANATION:
To set the map view on given latlongs([17.387140, 78.491684]), 13 means zoom.
Adding tiles on the maps.
Latlongs.
Drawing polylines ant paths by setting css.
Add the layer to the path.
It was my mistake, Polyline works properly. I had an array of latlng that were not in an order. Putting an ordered latlng points helped me plot the route correctly between source and destination.

fitBounds of markers with Leaflet

I have a array of markers named markersand i add those markers in map using LeafletJs
L.layerGroup(markers).addTo(map);
Now i want to focus on a viewport that covers all markers
var bounds = L.latLngBounds(markers);
map.fitBounds(bounds, { padding: [20, 20] });
Why i get Cannot read property 'lat' of undefined error message in map.fitBounds(bounds, { padding: [20, 20] }); line.
The reason you're getting an error is because L.LatLngBounds expects two L.LatLng objects as parameter, not an array of markers, as you can see in the documentation. I would suggest using L.FeatureGroup, it's extended from L.LayerGroup but has some extras. It has a getBounds method, which will do exactly what you need, calculate the bounds according to all of the features added to the group. So you could do:
var featureGroup = L.featureGroup(markers).addTo(map);
map.fitBounds(featureGroup.getBounds());
Here's a working example on Plunker: http://plnkr.co/edit/EbzlaF05fLARDYbnXSSk

Start-Marker from geojson polyline

i have a map with some walking- and bike-routes and popups with a few details an a pic. Now i want to set a marker on the first vertex of a geojson polyline, but i cant find out how. Btw. i´m new to leaflet/mapbox, and i put my map togehter from code snippets.
Here is the map now:
This is how i create the polylines now. I call them via layercontrol.
var mtb = L.geoJson(radjs, {
filter: function (feature, layer) {
if (feature.properties) {
// If the property "underConstruction" exists and is true, return false (don't render features under construction)
return feature.properties.typ === 'mtb';
}
return true;
},
style: {
"color": '#6699cc',
dashArray: '',
"weight": 4,
"opacity": 0.6
}, onEachFeature: onEachFeature2}).addTo(rad);
Thank you for your help,
Marc
You could just add a Feature to your geojson with the latitude and longitude like the do it in the Leaflet GeoJSON Example.
Probably it will be more convenient to read the geometry.coordinates from geojson features and define a new marker.
Beside you have an error on line 569. You should change:
var map = L.mapbox.map('map','',{
to:
var map = L.mapbox.map('map',null,{
Create a simple marker object and add it to the map.
marker = L.marker([0, 0], {
icon: L.mapbox.marker.icon()
}).addTo(map)
Then set the latitude and longitude to the first coordinates of your geoJSON. Assuming your geoJSON is set to the var geojson, you can access the coordinates by indexing into the array.
marker.setLatLng(L.latLng(
geojson.coordinates[0][1],
geojson.coordinates[0][0]))