KML,SHP TAB互转，GDAL

  最近在接触地图数据转换的东西，从硬件kml的数据转换其他的格式，因为从没做过着东西， 先去了解kml文件格式

http://baike.baidu.com/view/400307.htm?fr=aladdin

   原来是谷歌地球的一种数据格式，先大致看了写里面的标签，kml与xml文件差多，

     kml数据:

        

        longitude:经度  latitude：纬度   altitude:高度 其他的就自己去看了。

        现在开始转换，在谷歌上找到一个开源的项目 里面是对地图数据的操作，GDAL

 http://www.gdal.org/ogr/ogr_formats.html 参考这里。

   kml->SHP

 private string CreateShp(List<Placemark> list)
        {

            //注册Ogr库
            string pszDriverName = DriverType.Shapefile;
            OSGeo.OGR.Ogr.RegisterAll();

            //为了支持中文路径，请添加下面这句代码
            OSGeo.GDAL.Gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES");
            // 为了支持shp属性表字段支持中文，请添加下面这句
            OSGeo.GDAL.Gdal.SetConfigOption("SHAPE_ENCODING", " ");

            //调用对Shape文件读写的Driver接口
            OSGeo.OGR.Driver poDriver = OSGeo.OGR.Ogr.GetDriverByName(pszDriverName);
            if (poDriver == null)
                return "打开驱动失败";

            //用此Driver创建Shape文件
            OSGeo.OGR.DataSource poDS;
            poDS = poDriver.CreateDataSource(CreateSavePath(), null);
            if (poDS == null)
                return "创建数据源失败";

            //创建层Layer
            OSGeo.OGR.Layer poLayer;
            poLayer = poDS.CreateLayer(CurrentDate, null, OSGeo.OGR.wkbGeometryType.wkbPoint, null);
            if (poLayer == null)
                return "创建地图层失败";

            //创建属性
            OSGeo.OGR.FieldDefn oField = new OSGeo.OGR.FieldDefn("name", OSGeo.OGR.FieldType.OFTString);
            oField.SetWidth(16);
            OSGeo.OGR.FieldDefn oField2 = new OSGeo.OGR.FieldDefn("height", OSGeo.OGR.FieldType.OFTInteger);

            OSGeo.OGR.FieldDefn ofield3 = new FieldDefn("lat", FieldType.OFTInteger);
            OSGeo.OGR.FieldDefn ofield4 = new FieldDefn("lng", FieldType.OFTInteger);


            poLayer.CreateField(oField, 1);
            poLayer.CreateField(oField2, 0);
            poLayer.CreateField(ofield3, 2);
            poLayer.CreateField(ofield4, 3);

            //创建一个Feature,一个Point
            OSGeo.OGR.Feature poFeature = new Feature(poLayer.GetLayerDefn());
            OSGeo.OGR.Geometry pt = new Geometry(OSGeo.OGR.wkbGeometryType.wkbPoint);


            foreach (Placemark item in list)
            {
                //属性一"名称"赋值
                poFeature.SetField(0, item.Name);
                //属性二"高度"赋值
                poFeature.SetField(1, item.LookAt.altitude);
                poFeature.SetField(2, item.LookAt.latitude);
                poFeature.SetField(3, item.LookAt.longitude);

                //添加坐标点 x  y z
                pt.AddPoint(item.LookAt.longitude, item.LookAt.latitude, item.LookAt.altitude);

                poFeature.SetGeometry(pt);
                //将带有坐标及属性的Feature要素点写入Layer中
                poLayer.CreateFeature(poFeature);


                
            }

       
            //关闭文件读写
            poFeature.Dispose();
            poDS.Dispose();

            return "转换成功";
        }

  SHP->mapinfo tab转换出现问题，当我的经纬度像上图一样小数位数比较多的情况，会自动截断，仔细调试都没找到解决办法，截断都是没规则的，只能继续谷歌了，╮(╯▽╰)╭。

    代码如下：

   

 public string Convert(string driverTypeName, OnAction action)
       {
           string msg = string.Empty;
           DataSource sourceSource;
           OSGeo.OGR.Driver shpDriver;
           RegisterAll(driverTypeName, out sourceSource, out shpDriver);
           DataSource destSource = shpDriver.CreateDataSource(Dest, new string[] {
                "AUX=YES",     
                 "STATISTICS=YES"});  //中文
           int layerCount = sourceSource.GetLayerCount();
           for (int i = 0; i < layerCount; i++)
           {
               Layer layer = sourceSource.GetLayerByIndex(i);
               int featureCount = layer.GetFeatureCount(0);
               Layer destLayer = null;

               //深度拷贝
               //Layer destLayer = destSource.CopyLayer(layer, dest, null);


               #region MyRegion
               for (int j = 0; j < featureCount; j++)
               {
                   Feature feature = layer.GetFeature(j);

                   if (feature != null)
                   {
                       try
                       {

                           if (destLayer == null)
                           {
                               wkbGeometryType geoType = feature.GetGeometryRef().GetGeometryType();
                               //创建图层
                               destLayer = destSource.CreateLayer(
                                   layer.GetName(),
                                   action(layer),
                                   geoType,
                                   new string[] { });
                               //创建字段
                               FeatureDefn featureDefn = layer.GetLayerDefn();
                               for (int k = 0; k < featureDefn.GetFieldCount(); k++)
                               {
                                   destLayer.CreateField(featureDefn.GetFieldDefn(k), 0);
                               }
                           }
                           //写入要素

                           Feature cloneFeature = feature.Clone();

                           //   Feature newfeature = ConvetToFeature(feature);


                           destLayer.CreateFeature(cloneFeature);


                           //  OnFeatureConvert(featureCount, EventArgs.Empty);
                       }
                       catch (Exception ex)
                       {
                           msg = "转换失败"+ex.Message;
                           continue;
                       }
                   }
               }
               #endregion

               //保存
               destLayer.SyncToDisk();
           }

           msg = "转换成功";
           sourceSource.Dispose();
           destSource.Dispose();
           shpDriver.Dispose();
           return msg;
       }

    原来是坐标系的问题，

   shp的默认与tab的坐标系不一样。参考文章:http://blog.sina.com.cn/s/blog_6e51df7f0100ui7n.html

   坐标系转换参考：http://wiki.woodpecker.org.cn/moin/lilin/ogr-create

 终于解决。