將多個 MapInfo 檔案轉換為唯一的 Shapefile，然后再次將該檔案轉換為 .KML 后，我得到了以下 .XML 檔案。我的想法是提取每組“坐標”部分，并使用它們構建多邊形。
其他嘗試的解決方案：
鑒于面臨這種阻塞的時間過長，我嘗試獲取每對“坐標”標簽并使用 Substring 獲取坐標。不幸的是，鑒于檔案的大小（> 400 MB），這種骯臟的方法是不切實際的。
xml檔案
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document id="root_doc">
<Schema id="PruebaKML4g.schema">
<SimpleField name="FID" type="float"/>
<SimpleField name="REGION" type="float"/>
<SimpleField name="NOMBRE" type="string"/>
<SimpleField name="layer" type="string"/>
<SimpleField name="path" type="string"/>
</Schema>
<Document id="PruebaKML4g">
<name>PruebaKML4g</name>
<Placemark id="PruebaKML4g.1">
<ExtendedData>
<SchemaData schemaUrl="#PruebaKML4g.schema">
<SimpleData name="FID">5</SimpleData>
<SimpleData name="REGION">1</SimpleData>
<SimpleData name="NOMBRE">BAJA CALIFORNIA</SimpleData>
<SimpleData name="layer">LBS_REGION_1_region</SimpleData>
<SimpleData name="path">C:/Files/LBS_REGION_1_region.shp</SimpleData>
</SchemaData>
</ExtendedData>
<MultiGeometry>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>
-105.258751,21.782028,0
-105.247174,21.81173,0
-105.241826,21.809401,0
-105.236994,21.806241,0
-105.232822,21.802344,0
-105.229439,21.79783,0
-105.228552,21.796052,0
-105.228974,21.795899,0
-105.230294,21.79522,0
-105.231872,21.79511,0
-105.234048,21.79431,0
-105.235131,21.794083,0
-105.236824,21.793857,0
-105.238518,21.793295,0
-105.239365,21.792389,0
-105.240327,21.790914,0
-105.242379,21.79046,0
-105.243829,21.790459,0
-105.245644,21.788766,0
-105.247331,21.785709,0
-105.24817,21.783115,0
-105.248701,21.780372,0
-105.258751,21.782028,0
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
...
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>
-103.704559,20.767933,0
-103.702714,20.773608,0
-103.701694,20.77322,0
-103.700762,20.772672,0
-103.699944,20.77198,0
-103.699267,20.771165,0
-103.698751,20.770252,0
-103.698411,20.769268,0
-103.698258,20.768243,0
-103.698297,20.76721,0
-103.704559,20.767933,0
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>
-105.160778,20.766278,0
-105.162411,20.77201,0
-105.161328,20.77219,0
-105.160228,20.77219,0
-105.159145,20.77201,0
-105.158111,20.771656,0
-105.157159,20.771139,0
-105.156317,20.770474,0
-105.15561,20.769682,0
-105.15506,20.768786,0
-105.160778,20.766278,0
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>
-117.125814,32.524285,0
-117.125516,32.524512,0
-117.125142,32.524428,0
-117.124876,32.524169,0
-117.124754,32.524513,0
-117.124784,32.525361,0
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
</Document>
</Document>
</kml>
我嘗試使用以下代碼：
主要的
public T DeserializeToObject<T>(string filepath) where T : class
{
System.Xml.Serialization.XmlSerializer xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(T));
using (StreamReader streamReader = new StreamReader(filepath))
{
return (T)xmlSerializer.Deserialize(streamReader);
}
}
private void Form1_Load(object sender, EventArgs e)
{
String pathKml = @"C:\PruebaKML4g.kml";
List<Kml> elementsList = DeserializeToObject<List<Kml>>(pathKml);
}
知識庫檔案
/*[XmlRoot(ElementName = "kml")] changed by Mike Clark suggestion*/
[XmlRoot(ElementName = "kml", Namespace = "http://www.opengis.net/kml/2.2")]
public class Kml
{
public List<Polygon> polygons = new List<Polygon>();
}
public class Polygon
{
[XmlAttribute("outerBoundaryIs")]
public String outerBoundaryIs { get; set; }
[XmlAttribute("linearRing")]
public String linearRing { get; set; }
[XmlAttribute("coordinates")]
public String coordinates { get; set; }
}
但是，XML 檔案中的 SimpleData 元素似乎干擾了我的決議，產生了以下錯誤
InvalidOperationException: xmlns='http://www.opengis.net/kml/2.2'> 不是預期的。
任何關于我的錯誤在哪里的線索將不勝感激。
uj5u.com熱心網友回復：
通過所有這些轉換步驟，也許 XML 檔案格式錯誤？或者可能有這么多資料的記憶體錯誤？嘗試使用低記憶體要求的 SAX 決議器決議檔案，讓它找到可能深埋在檔案中的任何語法錯誤。你安裝了 Python 嗎？
python -c "import xml.sax;p=xml.sax.make_parser();p.parse(r'yourfile.xml')"
更改yourfile.xml為 XML 檔案的正確路徑和檔案名。
如果它不列印任何內容，則該檔案在語法上是有效的。如果它列印錯誤，請嘗試使用錯誤中的 line:column info 來發現 XML 中的錯誤。
第2部分：
List<Kml> elementsList = DeserializeToObject<List<Kml>>(pathKml);
可能是錯誤的。XML 檔案只能有一個根<element>（在本例中為<kml>），因此我認為擁有 Kml 實體串列對決議器沒有意義。試試這個：
Kml root = DeserializeToObject<Kml>(pathKml);
但與下一個問題相比，這是一個簡單的問題，即我認為您的 C# 類結構需要準確反映 XML 的層次結構。多邊形位于此層次結構下：
kml > Document > Document > Placemark > MultiGeometry
這意味著你需要類似的東西
class Kml {
Document Document;
}
class Document {
Document Document;
Placemark Placemark;
}
class Placemark {
Polygon[] MultiGeometry;
}
class Polygon {
OuterBoundaryIs outerBoundaryIs;
}
class OuterBoundaryIs {
LinearRing LinearRing;
}
class LinearRing {
string coordinates;
}
那么你需要類似的東西
var polygons = kml.Document.Document.Placemark.MultiGeometry;
for(int i = 0; i < polygons.Length; i ) {
var polygon = polygons[i];
string coordinates = polygon.outerBoundaryIs.LinearRing.coordinates;
// do something with coordinates
}
順便說一句，這種型別的更好的決議器是 XPath 決議器，它可以避免使用 C# 類對 XML 結構進行建模的需要。制作 XPath 查詢需要一些練習和研究，但生成的代碼更清晰，而且有一定經驗是一項很好的技能。更多 XPath 見：
https://stackoverflow.com/a/16012736/11611195
https://docs.microsoft.com/en-us/dotnet/standard/data/xml/select-nodes-using-xpath-navigation
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