geotools中等值面的生成与OL3中的展示
来源：互联网 发布：问卷星数据分析 编辑：程序博客网 时间：2024/05/29 17:30
概述：
本文讲述如何在geotools中IDW插值生成等值面，并根据给定shp进行裁剪，并生成geojson数据，以及Openlayers3中展示。
效果：
插值数据
裁剪结果
裁剪区域数据
实现代码：
1、geotools
package com.lzugis.geotools;import com.amazonaws.util.json.JSONObject;import com.lzugis.CommonMethod;import com.lzugis.geotools.utils.FeaureUtil;import com.lzugis.geotools.utils.GeoJSONUtil;import com.vividsolutions.jts.geom.Geometry;import org.geotools.data.FeatureSource;import org.geotools.data.shapefile.ShapefileDataStore;import org.geotools.data.simple.SimpleFeatureCollection;import org.geotools.data.simple.SimpleFeatureSource;import org.geotools.feature.FeatureCollection;import org.geotools.feature.FeatureIterator;import org.geotools.geojson.feature.FeatureJSON;import org.opengis.feature.Feature;import org.opengis.feature.simple.SimpleFeature;import wContour.Contour;import wContour.Global.Border;import wContour.Global.PointD;import wContour.Global.PolyLine;import wContour.Global.Polygon;import wContour.Interpolate;import java.io.File;import java.io.StringWriter;import java.nio.charset.Charset;import java.util.*;/** * Created by admin on 2017/8/29. */public class EquiSurface { /** * 生成等值面 * * @param trainData 训练数据 * @param dataInterval 数据间隔 * @param size 大小，宽，高 * @param boundryFile 四至 * @param isclip 是否裁剪 * @return */ public String calEquiSurface(double[][] trainData, double[] dataInterval, int[] size, String boundryFile, boolean isclip) { String geojsonpogylon = ""; try { double _undefData = -9999.0; SimpleFeatureCollection polygonCollection = null; List<PolyLine> cPolylineList = new ArrayList<PolyLine>(); List<Polygon> cPolygonList = new ArrayList<Polygon>(); int width = size[0], height = size[1]; double[] _X = new double[width]; double[] _Y = new double[height]; File file = new File(boundryFile); ShapefileDataStore shpDataStore = null; shpDataStore = new ShapefileDataStore(file.toURL()); //设置编码 Charset charset = Charset.forName("GBK"); shpDataStore.setCharset(charset); String typeName = shpDataStore.getTypeNames()[0]; SimpleFeatureSource featureSource = null; featureSource = shpDataStore.getFeatureSource(typeName); SimpleFeatureCollection fc = featureSource.getFeatures(); double minX = fc.getBounds().getMinX(); double minY = fc.getBounds().getMinY(); double maxX = fc.getBounds().getMaxX(); double maxY = fc.getBounds().getMaxY(); Interpolate.CreateGridXY_Num(minX, minY, maxX, maxY, _X, _Y); double[][] _gridData = new double[width][height]; int nc = dataInterval.length; _gridData = Interpolate.Interpolation_IDW_Neighbor(trainData, _X, _Y, 12, _undefData);// IDW插值 int[][] S1 = new int[_gridData.length][_gridData[0].length]; List<Border> _borders = Contour.tracingBorders(_gridData, _X, _Y, S1, _undefData); cPolylineList = Contour.tracingContourLines(_gridData, _X, _Y, nc, dataInterval, _undefData, _borders, S1);// 生成等值线 cPolylineList = Contour.smoothLines(cPolylineList);// 平滑 cPolygonList = Contour.tracingPolygons(_gridData, cPolylineList, _borders, dataInterval); geojsonpogylon = getPolygonGeoJson(cPolygonList); if (isclip) { polygonCollection = GeoJSONUtil.readGeoJsonByString(geojsonpogylon); FeatureSource dc = clipFeatureCollection(fc, polygonCollection); geojsonpogylon = getPolygonGeoJson(dc.getFeatures()); } } catch (Exception e) { e.printStackTrace(); } return geojsonpogylon; } private FeatureSource clipFeatureCollection(FeatureCollection fc, SimpleFeatureCollection gs) { FeatureSource cs = null; try { List<Map<String, Object>> values = new ArrayList<Map<String, Object>>(); FeatureIterator contourFeatureIterator = gs.features(); FeatureIterator dataFeatureIterator = fc.features(); while (dataFeatureIterator.hasNext()) { Feature dataFeature = dataFeatureIterator.next(); Geometry dataGeometry = (Geometry) dataFeature.getProperty( "the_geom").getValue(); while (contourFeatureIterator.hasNext()) { Feature contourFeature = contourFeatureIterator.next(); Geometry contourGeometry = (Geometry) contourFeature .getProperty("geometry").getValue(); double lv = (Double) contourFeature.getProperty("lvalue") .getValue(); double hv = (Double) contourFeature.getProperty("hvalue") .getValue(); if (dataGeometry.intersects(contourGeometry)) { Geometry geo = dataGeometry .intersection(contourGeometry); Map<String, Object> map = new HashMap<String, Object>(); map.put("the_geom", geo); map.put("lvalue", lv); map.put("hvalue", hv); values.add(map); } } } contourFeatureIterator.close(); dataFeatureIterator.close(); SimpleFeatureCollection sc = FeaureUtil .creatSimpleFeatureByFeilds( "polygons", "crs:4326,the_geom:MultiPolygon,lvalue:double,hvalue:double", values); cs = FeaureUtil.creatFeatureSourceByCollection(sc); } catch (Exception e) { e.printStackTrace(); return cs; } return cs; } private String getPolygonGeoJson(FeatureCollection fc) { FeatureJSON fjson = new FeatureJSON(); StringBuffer sb = new StringBuffer(); try { sb.append("{\"type\": \"FeatureCollection\",\"features\": "); FeatureIterator itertor = fc.features(); List<String> list = new ArrayList<String>(); while (itertor.hasNext()) { SimpleFeature feature = (SimpleFeature) itertor.next(); StringWriter writer = new StringWriter(); fjson.writeFeature(feature, writer); list.add(writer.toString()); } itertor.close(); sb.append(list.toString()); sb.append("}"); } catch (Exception e) { e.printStackTrace(); } return sb.toString(); } private String getPolygonGeoJson(List<Polygon> cPolygonList) { String geo = null; String geometry = " { \"type\":\"Feature\",\"geometry\":"; String properties = ",\"properties\":{ \"hvalue\":"; String head = "{\"type\": \"FeatureCollection\"," + "\"features\": ["; String end = " ] }"; if (cPolygonList == null || cPolygonList.size() == 0) { return null; } try { for (Polygon pPolygon : cPolygonList) { List<Object> ptsTotal = new ArrayList<Object>(); List<Object> pts = new ArrayList<Object>(); PolyLine pline = pPolygon.OutLine; for (PointD ptD : pline.PointList) { List<Double> pt = new ArrayList<Double>(); pt.add(ptD.X); pt.add(ptD.Y); pts.add(pt); } ptsTotal.add(pts); if (pPolygon.HasHoles()) { for (PolyLine cptLine : pPolygon.HoleLines) { List<Object> cpts = new ArrayList<Object>(); for (PointD ccptD : cptLine.PointList) { List<Double> pt = new ArrayList<Double>(); pt.add(ccptD.X); pt.add(ccptD.Y); cpts.add(pt); } if (cpts.size() > 0) { ptsTotal.add(cpts); } } } JSONObject js = new JSONObject(); js.put("type", "Polygon"); js.put("coordinates", ptsTotal); double hv = pPolygon.HighValue; double lv = pPolygon.LowValue; if (hv == lv) { if (pPolygon.IsClockWise) { if (!pPolygon.IsHighCenter) { hv = hv - 0.1; lv = lv - 0.1; } } else { if (!pPolygon.IsHighCenter) { hv = hv - 0.1; lv = lv - 0.1; } } } else { if (!pPolygon.IsClockWise) { lv = lv + 0.1; } else { if (pPolygon.IsHighCenter) { hv = hv - 0.1; } } } geo = geometry + js.toString() + properties + hv + ", \"lvalue\":" + lv + "} }" + "," + geo; } if (geo.contains(",")) { geo = geo.substring(0, geo.lastIndexOf(",")); } geo = head + geo + end; } catch (Exception e) { e.printStackTrace(); return geo; } return geo; } public static void main(String[] args) { long start = System.currentTimeMillis(); EquiSurface equiSurface = new EquiSurface(); CommonMethod cm = new CommonMethod(); double[] bounds = {73.4510046356223, 18.1632471876417, 134.976797646506, 53.5319431522236}; double[][] trainData = new double[3][100]; for (int i = 0; i < 100; i++) { double x = bounds[0] + new Random().nextDouble() * (bounds[2] - bounds[0]), y = bounds[1] + new Random().nextDouble() * (bounds[3] - bounds[1]), v = 0 + new Random().nextDouble() * (45 - 0); trainData[0][i] = x; trainData[1][i] = y; trainData[2][i] = v; } double[] dataInterval = new double[]{20, 25, 30, 35, 40, 45}; String boundryFile = "D:\\data\\国家基础地理信息系统SHP文件\\国界\\国界\\bou1_4p.shp"; int[] size = new int[]{100, 100}; boolean isclip = true; try { String strJson = equiSurface.calEquiSurface(trainData, dataInterval, size, boundryFile, isclip); String strFile = "d:/china1.json"; cm.append2File(strFile, strJson); System.out.println(strFile + "差值成功, 共耗时" + (System.currentTimeMillis() - start) + "ms"); } catch (Exception e) { e.printStackTrace(); } }}2、openlayers3
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Ol3 wms</title><link rel="stylesheet" type="text/css" href="../../../plugin/ol3/css/ol.css"/><style type="text/css">body, #map {border: 0px;margin: 0px;padding: 0px;width: 100%;height: 100%;font-size: 13px;}#infobox{position: absolute;top: 10px;right: 10px;z-index: 999;background: #ffffff;border: 1px solid #000;box-shadow: 1px 1px 1px #C0C0C0;}</style><script type="text/javascript" src="../../../plugin/ol3/build/ol-debug.js"></script><script type="text/javascript" src="../../../plugin/jquery/jquery-1.8.3.js"></script><script type="text/javascript">function init(){var bounds = [73.4510046356223, 18.1632471876417,134.976797646506, 53.5319431522236];var projection = new ol.proj.Projection({code: 'EPSG:4326',units: 'degrees'});$.get("data/china1.json",null,function(result){var features = (new ol.format.GeoJSON()).readFeatures(result);var vectorSource = new ol.source.Vector();vectorSource.addFeatures(features);var vector = new ol.layer.Vector({source: vectorSource,style:function(feature, resolution) {var lvalue = feature.get("lvalue"), color = "0,0,0,0";if(lvalue<20){color = "245,200,200,255";}else if(lvalue>=20&&lvalue<30){color = "245,183,48,255";}else if(lvalue>=25&&lvalue<30){color = "245,20,48,255";}else if(lvalue>=30&&lvalue<35){color = "0,183,48,255";}else{color = "0,255,255,255";}return new ol.style.Style({ stroke: new ol.style.Stroke({ color: '#ffffff',// lineDash: [10], width: 1 }), fill: new ol.style.Fill({ color: "rgba("+color+")", opacity:0.6 })});}}); var tiled = new ol.layer.Tile({ source: new ol.source.TileWMS({ url: 'http://192.168.10.185:8086/geoserver/lzugis/wms', params: {'FORMAT': 'image/png', 'VERSION': '1.1.1', tiled: true, LAYERS: 'lzugis:capital', STYLES: '' }, serverType: 'geoserver' }) });var map = new ol.Map({controls: ol.control.defaults({attribution: false}),target: 'map',layers: [vector,tiled],view: new ol.View({projection: projection})});map.getView().fit(bounds, map.getSize());});}</script></head><body onLoad="init()"><div id="map"><div id="infobox"></div></div></body></html>-----------------------------------------------------------------------------------------------
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