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| import EsriJSON from 'ol/format/EsriJSON.js';
import Map from 'ol/Map.js';
import VectorSource from 'ol/source/Vector.js';
import View from 'ol/View.js';
import XYZ from 'ol/source/XYZ.js';
import {Fill, Stroke, Style} from 'ol/style.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
import {createXYZ} from 'ol/tilegrid.js';
import {fromLonLat} from 'ol/proj.js';
import {tile as tileStrategy} from 'ol/loadingstrategy.js';
const serviceUrl =
'https://services-eu1.arcgis.com/NPIbx47lsIiu2pqz/ArcGIS/rest/services/' +
'Neptune_Coastline_Campaign_Open_Data_Land_Use_2014/FeatureServer/';
const layer = '0';
const fillColors = {
'Lost To Sea Since 1965': [0, 0, 0, 1],
'Urban/Built-up': [104, 104, 104, 1],
'Shacks': [115, 76, 0, 1],
'Industry': [230, 0, 0, 1],
'Wasteland': [230, 0, 0, 1],
'Caravans': [0, 112, 255, 0.5],
'Defence': [230, 152, 0, 0.5],
'Transport': [230, 152, 0, 1],
'Open Countryside': [255, 255, 115, 1],
'Woodland': [38, 115, 0, 1],
'Managed Recreation/Sport': [85, 255, 0, 1],
'Amenity Water': [0, 112, 255, 1],
'Inland Water': [0, 38, 115, 1],
};
const style = new Style({
fill: new Fill(),
stroke: new Stroke({
color: [0, 0, 0, 1],
width: 0.5,
}),
});
const vectorSource = new VectorSource({
format: new EsriJSON(),
url: function (extent, resolution, projection) {
const srid = projection
.getCode()
.split(/:(?=\d+$)/)
.pop();
const url =
serviceUrl +
layer +
'/query/?f=json&' +
'returnGeometry=true&spatialRel=esriSpatialRelIntersects&geometry=' +
encodeURIComponent(
'{"xmin":' +
extent[0] +
',"ymin":' +
extent[1] +
',"xmax":' +
extent[2] +
',"ymax":' +
extent[3] +
',"spatialReference":{"wkid":' +
srid +
'}}'
) +
'&geometryType=esriGeometryEnvelope&inSR=' +
srid +
'&outFields=*' +
'&outSR=' +
srid;
return url;
},
strategy: tileStrategy(
createXYZ({
tileSize: 512,
})
),
attributions:
'University of Leicester (commissioned by the ' +
'<a href="https://www.arcgis.com/home/item.html?id=' +
'd5f05b1dc3dd4d76906c421bc1727805">National Trust</a>)',
});
const vector = new VectorLayer({
source: vectorSource,
style: function (feature) {
const classify = feature.get('LU_2014');
const color = fillColors[classify] || [0, 0, 0, 0];
style.getFill().setColor(color);
return style;
},
opacity: 0.7,
});
const raster = new TileLayer({
source: new XYZ({
attributions:
'Tiles © <a href="https://services.arcgisonline.com/ArcGIS/' +
'rest/services/World_Topo_Map/MapServer">ArcGIS</a>',
url:
'https://server.arcgisonline.com/ArcGIS/rest/services/' +
'World_Topo_Map/MapServer/tile/{z}/{y}/{x}',
}),
});
const map = new Map({
layers: [raster, vector],
target: document.getElementById('map'),
view: new View({
center: fromLonLat([1.72, 52.4]),
zoom: 14,
}),
});
const displayFeatureInfo = function (pixel) {
const feature = map.forEachFeatureAtPixel(pixel, function (feature) {
return feature;
});
if (feature) {
const info =
'2014 Land Use: ' +
feature.get('LU_2014') +
'<br>1965 Land Use: ' +
feature.get('LU_1965');
document.getElementById('info').innerHTML = info;
map.getTarget().style.cursor = 'pointer';
} else {
document.getElementById('info').innerHTML = ' <br> ';
map.getTarget().style.cursor = '';
}
};
map.on(['click', 'pointermove'], function (evt) {
if (evt.dragging) {
return;
}
displayFeatureInfo(evt.pixel);
});
|
)
