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ol-contours-gxV11.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>contour</title>
<link href="./lib/openlayer/ol.css" rel="stylesheet" />
<style>
html,
body {
height: 100%;
width: 100%;
padding: 0px;
margin: 0px;
overflow: hidden;
}
#map {
height: 100%;
width: 100%;
}
#contour {
position: absolute;
z-index: 999;
top: 0px;
left: 0px;
opacity: 0.5;
}
</style>
</head>
<body>
<div id="map"></div>
</body>
<script src="lib/jqure1.7.min.js"></script>
<script src="lib/d3.v4.min.js"></script>
<script src="lib/d3-contour.v1.min.js"></script>
<script src="lib/dat.gui.min.js"></script>
<script src="lib/turf.min.js"></script>
<script src="lib/openlayer/ol-debug.js"></script>
<script src="js/color.util.js"></script>
<script src="data/procince.js"></script>
<script>
/**
* 将插值计算结果丢给contour得到geojson进行绘图
* todo 加入涠洲岛
* ol边界裁剪bug
*/
var mode = {};
mode.dataLoad = false;
// GUI
var gui = new dat.GUI();
// 下拉框形式选择文案
gui.add(mode, 'dataLoad').onChange(function () {
if (!originData) {
AjaxGET()
}
});
var originData;
function AjaxGET() {
$.ajax({
type: "get",
url: "./data/getGxTEM.json",
dataType: "json",
success: function (json) {
originData = json.data;
ContourInit(originData);
}
});
}
const tdtBase = new ol.layer.Tile({
title: "天地图矢量经纬度底图",
source: new ol.source.XYZ({
url: "http://t0.tianditu.gov.cn/DataServer?T=vec_w&X={x}&Y={y}&L={z}&tk=c4f61f8b0b036ff262d8b480fa826711"
})
})
const tdt_cva_w = new ol.layer.Tile({
title: "天地图经纬度矢量注记",
source: new ol.source.XYZ({
url: 'http://t0.tianditu.gov.cn/DataServer?T=cva_w&x={x}&y={y}&l={z}&tk=c4f61f8b0b036ff262d8b480fa826711'
}),
zIndex: 999
});
const tdt_cia_w = new ol.layer.Tile({
title: "天地图经纬度道路",
source: new ol.source.XYZ({
url: 'http://t0.tianditu.gov.cn/DataServer?T=cia_w&x={x}&y={y}&l={z}&tk=c4f61f8b0b036ff262d8b480fa826711'
}),
zIndex: 998
});
const googleMapLayer = new ol.layer.Tile({
title: "高德",
source: new ol.source.XYZ({
url: 'http://mt{0-3}.google.cn/vt/lyrs=m@235000000&hl=zh-CN&gl=CN&src=app&x={x}&y={y}&z={z}&s=Galileo'
})
});
const baseLayer = new ol.layer.Tile({
title: "base",
source: new ol.source.OSM()
});
var map = new ol.Map({
target: 'map',
layers: [googleMapLayer],
view: new ol.View({
center: [108.22, 22.48],
// center: ol.proj.transform([108.22, 22.48], 'EPSG:4326', 'EPSG:3857'),
projection: 'EPSG:4326',
zoom: 7
})
});
map.on('click', (evt) => {
const px = map.getPixelFromCoordinate(evt.coordinate);
const coord = map.getCoordinateFromPixel(px);
})
var regionFeatures = new ol.format.GeoJSON().readFeatures(Regioncoord);
let source = new ol.source.Vector();
let layer = new ol.layer.Vector({
source: source,
style: function (feature, res) {
const value = parseInt(feature.get('value'));
const color = getColor(colors, value)
const style = new ol.style.Style({
fill: new ol.style.Fill({
color: color
}),
stroke: new ol.style.Stroke({
color: color,
width: 1
})
})
return [style];
},
opacity: 0.9
});
map.addLayer(layer);
var fillStyle = new ol.style.Fill({
color: [0, 0, 0, 0]
});
var styleVC = new ol.style.Style({
fill: fillStyle
})
layer.on('precompose', function (event) {
const ctx = event.context;
const pixelRatio = event.frameState.pixelRatio;
// For openlayers v6.0+:
// var vecCtx = ol.render.getVectorContext(event);
const vecCtx = event.vectorContext;
vecCtx.setStyle(styleVC);
ctx.lineWidth = 1 * pixelRatio;
ctx.strokeStyle = 'rgba(0,0,0,0.5)';
regionFeatures.map(fea => {
ctx.save();
vecCtx.drawGeometry(fea.getGeometry());
ctx.stroke();
})
ctx.clip();
});
// For openlayers v6.0+:
// osm.on('postrender', function (event) {
layer.on('postcompose', function (event) {
const ctx = event.context;
ctx.restore();
});
var dataset = {
"type": "FeatureCollection",
"features": []
};
function ContourInit(_data) {
console.time('contour');
const extent = map.getView().calculateExtent();
const left = extent[0];
const bottom = extent[1];
const right = extent[2];
const extop = extent[3];
const size = map.getSize();
const xscale = size[0] / (right - left);
const yscale = size[1] / (extop - bottom);
const areaExtent = regionFeatures[0].getGeometry().getExtent()
const pxregion = getPxRegion([[areaExtent[0], areaExtent[1]], [areaExtent[2], areaExtent[3]]], xscale, yscale, extop, left);
const cw = pxregion.xmax - pxregion.xmin;
const ch = pxregion.ymax - pxregion.ymin;
const regionTopLeft = pointToCoord(pxregion.xmin, pxregion.ymin, xscale, yscale, extop, left);
const _left = regionTopLeft[0];
const _top = regionTopLeft[1];
const regionBottomRight = pointToCoord(pxregion.xmax, pxregion.ymax, xscale, yscale, extop, left);
const _right = regionBottomRight[0];
const _bottom = regionBottomRight[1];
// 这里是画布分辨率
const _xscale = cw / (_right - _left);
const _yscale = ch / (_top - _bottom);
const pxdata = getPxData(_data, _xscale, _yscale, _top, _left);
// const pxdata = getPxData(_data, xscale, yscale, extop, left);
const contours = d3.contours().size([cw, ch]); //等高线绘图实例
const idwdata = olIDW(pxdata.data, cw, ch);
const thresholds = getThresholds(pxdata.vmax, pxdata.vmin, colors);
//绘图等高线图
contours
.thresholds(thresholds)
(idwdata)
.forEach(getContourGeojson);
function getContourGeojson(geometry) {
let coordinates = geometry.coordinates;
const len1 = coordinates.length;
if (len1 === 0) { return }
for (let i = len1 - 1; i >= 0; i--) {
const len2 = coordinates[i].length;
for (let j = len2 - 1; j >= 0; j--) {
const len3 = coordinates[i][j].length;
for (let m = len3 - 1; m >= 0; m--) {
coordinates[i][j][m] = pointToCoord(coordinates[i][j][m][0] + pxregion.xmin, coordinates[i][j][m][1] + pxregion.ymin, xscale, yscale, extop, left)
}
}
}
const fea = {
"type": "Feature",
"properties": {
"value": geometry.value
},
"geometry": {
"type": geometry.type,
"coordinates": coordinates
}
}
dataset.features.push(fea);
// // 相交去除多余
// let _fea = turf.intersect(Regioncoord.features[0], fea)
// if (!_fea) {
// dataset.features.push(fea);
// } else {
// _fea.properties = fea.properties
// dataset.features.push(_fea);
// }
}
function sortArea(a, b) {
return turf.area(b) - turf.area(a);
}
//按照面积对图层进行排序，规避turf的一个bug
dataset.features.sort(sortArea)
const format = new ol.format.GeoJSON();
let features = format.readFeatures(dataset);
source.addFeatures(features);
console.timeEnd('contour');
}
// 获取色斑图分度带
function getThresholds(vmax, vmin, color) {
const len = color.length;
const thresholds = [vmin]
for (let i = 0; i < len; i++) {
if (typeof (color[i]['min']) != 'number' || typeof (color[i]['max']) != 'number') {
continue
}
if (color[i]['min'] >= vmin && color[i]['min'] < vmax && color[i]['min'] !== thresholds[thresholds.length - 1]) {
thresholds.push(color[i]['min'])
}
if (color[i]['max'] >= vmin && color[i]['max'] < vmax && color[i]['max'] !== thresholds[thresholds.length - 1]) {
thresholds.push(color[i]['max'])
}
}
thresholds.push(vmax)
return thresholds
}
function getPxRegion(data, xscale, yscale, top, left) {
var _data = [];
var xmax = 0;
var ymax = 0;
var xmin = 9999;
var ymin = 9999;
for (var i = 0; i < data.length; i++) {
var p = coordToPoint(data[i][0], data[i][1], xscale, yscale, top, left)
if (i === 0) {
xmax = p[0];
ymax = p[1];
}
if (p[0] != 0 || p[1] != 0) {
xmax > p[0] ? null : xmax = p[0];
ymax > p[1] ? null : ymax = p[1];
xmin < p[0] ? null : xmin = p[0];
ymin < p[1] ? null : ymin = p[1];
_data.push({
x: p[0],
y: p[1]
})
}
}
return {
data: _data,
xmax: Math.floor(xmax),
ymax: Math.floor(ymax),
xmin: Math.floor(xmin),
ymin: Math.floor(ymin),
}
}
function getPxData(data, xscale, yscale, top, left) {
var _data = [];
var xmax = 0;
var ymax = 0;
var xmin = 9999;
var ymin = 9999;
var vmax = 0;
var vmin = 999999;
for (var i = 0; i < data.length; i++) {
var p = coordToPoint(data[i].Lon, data[i].Lat, xscale, yscale, top, left)
if (i === 0) {
xmax = p[0];
ymax = p[1];
}
if (p[0] != 0 || p[1] != 0) {
const _value = Number(data[i].TEM);
xmax > p[0] ? null : xmax = p[0];
ymax > p[1] ? null : ymax = p[1];
xmin < p[0] ? null : xmin = p[0];
ymin < p[1] ? null : ymin = p[1];
vmax > _value ? null : (vmax = _value);
vmin < _value ? null : (vmin = _value);
_data.push({
x: p[0],
y: p[1],
value: _value
})
}
}
// value一定要确保是number类型，否则在插值计算的会先string转number再计算，影响效率
return {
data: _data,
xmax: xmax,
ymax: ymax,
xmin: xmin,
ymin: ymin,
vmax: Math.floor(vmax),
vmin: Math.floor(vmin)
}
}
function pointToCoord(px, py, xscale, yscale, top, left) {
const x = (px / xscale) + left;
const y = top - (py / yscale);
return [x, y];
}
function coordToPoint(x, y, xscale, yscale, top, left) {
// 目的是为了剔除范围外的数据
let px = (x - left) * xscale;
let py = (top - y) * yscale;
px > 0 ? null : px = 0;
py > 0 ? null : py = 0;
return [px, py]
}
function olIDW(data, width, height) {
const s = new Date().getTime();
const d = data;
//已有点初始二维数组
const dlen = d.length;
let matrixData = new Array(width * height);
/**
* 插值矩阵数据,时间复杂度O(height*width*len)
*/
let idwcount = 0
for (let i = 0, k1 = 0; i < height; i++) {
for (let j = 0; j < width; j++, k1++) {
let sum0 = 0, sum1 = 0;
for (let k = dlen - 1; k >= 0; k--) {
const dk = d[k];
const dis = Math.pow((i - dk.y), 2) + Math.pow((j - dk.x), 2);
sum0 += dk.value / dis;
sum1 += 1 / dis;
idwcount++
}
matrixData[k1] = sum0 / sum1
}
}
console.log(idwcount)
const e = new Date().getTime();
console.log('插值：' + (e - s) / 1000 + '秒');
return matrixData;
}
function getColor(_colors, value) {
var len = _colors.length;
for (var i = 0; i < len; i++) {
if (value >= _colors[i].min && value < _colors[i].max) {
return _colors[i].color
}
}
}
</script>
</html>