MeteoInfo-Java解析与绘图教程(六)

这一节主要说的是我们取到自动站的数据,如何通过插值,转化成格点数据,并绘制图层

        //从数据库查询cimiss数据
        List<Map<String,Object>> list = DBUtil.getMapList("SELECT * FROM mete_stationpar_data_2021 WHERE DataTime = '2021-01-01 12:00:00' AND TEM IS NOT NULL");
        //创建站点格点
        StationData stationData = new StationData();
        //循环数据将值塞入格点中
        for (Map<String, Object> item : list) {
            System.out.println(item);
            stationData.addData(String.valueOf(item.get("Station_Name")),
                    Double.parseDouble(item.get("Lon").toString()),
                    Double.parseDouble(item.get("Lat").toString()),
                    Double.parseDouble(item.get("TEM").toString()));
        }
        //读取地图图层
        VectorLayer altMap = MapDataManage.readMapFile_ShapeFile("C:\\Users\\Administrator\\Downloads\\阿勒泰地区\\阿勒泰地区.shp");
        //创建网格设置参数
        GridDataSetting gridDataSetting = new GridDataSetting();
        //设定数据区域
        gridDataSetting.dataExtent = altMap.getExtent();
        //设定格点数
        gridDataSetting.xNum = list.size();
        gridDataSetting.yNum = list.size();
        //创建插值设置
        InterpolationSetting interpolationSetting = new InterpolationSetting();
        //设定格点配置
        interpolationSetting.setGridDataSetting(gridDataSetting);
        //设定插值方法
        interpolationSetting.setInterpolationMethod(InterpolationMethods.IDW_Radius);
        //设定搜索半径
        interpolationSetting.setRadius(10);
        //设置最小点数
        interpolationSetting.setMinPointNum(1);
        //插值到格点
        GridData gridData = stationData.interpolateData(interpolationSetting);
        LegendScheme als = LgsUtil.readFromLgs("D:\\apache-tomcat-8.0.50\\alt色阶\\color\\ECMWF_HR\\TMP.lgs");
        //绘制图层
        VectorLayer layer = DrawMeteoData.createShadedLayer(gridData,als,"","",true);
        //创建视图
        MapView view = new MapView();
        PolygonBreak pb = (PolygonBreak) altMap.getLegendScheme().getLegendBreak(0);
        pb.setDrawFill(false);
        pb.setOutlineColor(Color.GRAY);
        layer = layer.clip(altMap);
        //叠加图层
        view.addLayer(layer);
        view.addLayer(altMap);


        /**
         * 通用方法,可以抽成工具类
         */
        MapLayout layout  = new MapLayout();
        //去除图形边框
        layout.getActiveMapFrame().setDrawNeatLine(false);
        //区域边界
        Extent extent = view.getExtent();
        //设置矩形的宽和高
        Rectangle bounds = new Rectangle(800, (int) (800 * 1D / extent.getWidth() * extent.getHeight()));
        //设置地图边框
        layout.setPageBounds(new Rectangle(0, 0, bounds.width, bounds.height));
        //设置页面边框
        layout.getActiveMapFrame().setLayoutBounds(new Rectangle(0, 0, bounds.width, bounds.height));
        layout.getActiveMapFrame().setMapView(view);
        layout.exportToPicture(PathUtil.getDeskPath()+"/1.png");

对于该方法主要有几个重点需要关注:

  1.GridDataSetting 它是对矩阵做了布局设置

  2.InterpolationSetting 它是对插值做了设置,InterpolationMethods就包含了几种插值法,但感觉效果最好的是IDW_Radius,而我们绘制的时候最舒服的方法还是克里金插值,如果可以的话,可以根据原理自己封装一个

图片展示:

简单的绘制基本上都结束了,我也在不停的研究,有新东西我会公布出来,如果大家也有想法可以私聊我来交流一下,让我们对气象开发更加简单舒服