shp geometry null

"shp geometry null" 是指在存储空间数据文件中的几何形状属性为空。通常情况下，这可能是由于数据输入错误、文件损坏或者数据转换过程中的问题所导致的。

出现"shp geometry null"的情况下，需要先确认数据文件是否正确地导入到了系统中，并且几何形状数据是否完整。如果是由于数据输入错误导致的问题，需要对数据进行修正并重新导入到系统中。如果是由于文件损坏导致的问题，需要考虑修复或者使用备份文件替换。

另外，也需要注意在进行数据转换过程中是否发生了错误。在进行数据格式转换或者数据处理的过程中，可能会出现几何形状属性为空的情况，需要及时检查并修正处理错误。同时，确保使用的软件或工具对几何形状属性的处理和导入有良好的支持和兼容性。

总之，解决"shp geometry null"的问题需要对数据进行仔细检查和修正，并且保证在数据处理和转换的过程中没有出现问题。只有保证数据的完整性和正确性，才能确保数据在系统中的有效使用。

相关问题

Java dxf转shp

非常抱歉，作为AI语言模型，我没有直接的能力进行Java程序设计和运行。但是，您可以使用Java库来实现dxf到shp的转换。以下是一些可能会对您有帮助的Java库和示例：

1. GeoTools - 一个用于处理地理空间数据的开源Java库，可以处理dxf和shp格式。它提供了很多示例代码和文档。

2. JTS Topology Suite - 一个用于处理地理空间数据的Java库，也可以处理dxf和shp格式。它提供了许多示例代码和文档。

3. GDAL - 一个用于处理各种地理空间数据格式的C++/Java库，支持dxf和shp格式。它还提供了Java接口和示例代码。

使用这些库，您可以编写Java代码来实现dxf到shp的转换。以下是一个基本的示例代码使用GeoTools库：

import org.geotools.data.*;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.geojson.feature.FeatureJSON;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.locationtech.jts.geom.*;
import org.locationtech.jts.io.WKTReader;
import org.locationtech.jts.io.WKTWriter;
import org.opengis.feature.simple.*;
import org.opengis.feature.type.*;
import java.io.*;
import java.util.*;
import java.util.zip.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.nio.charset.Charset;

public class DxfToShpConverter {
  private static GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null);

  public static void main(String[] args) {
    String dxfFileName = "input.dxf";
    String shpFileName = "output.shp";
    try {
      SimpleFeatureCollection features = getFeaturesFromDxf(dxfFileName);
      writeFeaturesToShp(features, shpFileName);
      System.out.println("Conversion completed successfully!");
    } catch (Exception e) {
      System.out.println("Error during conversion: " + e.getMessage());
    }
  }

  private static SimpleFeatureCollection getFeaturesFromDxf(String dxfFileName) throws Exception {
    SimpleFeatureType featureType = createFeatureType();
    SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(featureType);
    List<SimpleFeature> features = new ArrayList<SimpleFeature>();
    FileInputStream fis = new FileInputStream(dxfFileName);
    BufferedInputStream bis = new BufferedInputStream(fis);
    ZipInputStream zis = new ZipInputStream(bis);
    ZipEntry entry = zis.getNextEntry();
    while (entry != null) {
      String fileName = entry.getName();
      if (fileName.endsWith(".xml") && entry.getSize() > 0) {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(zis);
        Node node = doc.getElementsByTagName("Entities").item(0);
        NodeList nodeList = node.getChildNodes();
        for (int i = 0; i < nodeList.getLength(); i++) {
          Node childNode = nodeList.item(i);
          if (childNode.getNodeType() == Node.ELEMENT_NODE) {
            Element element = (Element) childNode;
            if (element.getNodeName().equals("Line")) {
              LineString lineString = createLineStringFromElement(element);
              featureBuilder.add(lineString);
              SimpleFeature feature = featureBuilder.buildFeature(null);
              features.add(feature);
            } else if (element.getNodeName().equals("Circle")) {
              Polygon polygon = createPolygonFromCircleElement(element);
              featureBuilder.add(polygon);
              SimpleFeature feature = featureBuilder.buildFeature(null);
              features.add(feature);
            } // add more cases for other entities
          }
        }
      }
      entry = zis.getNextEntry();
    }
    zis.close();
    SimpleFeatureCollection featureCollection = DataUtilities.collection(features);
    return featureCollection;
  }

  private static LineString createLineStringFromElement(Element element) {
    Coordinate[] coordinates = new Coordinate[2];
    String startX = element.getAttribute("StartX");
    String startY = element.getAttribute("StartY");
    String endX = element.getAttribute("EndX");
    String endY = element.getAttribute("EndY");
    coordinates[0] = new Coordinate(Double.parseDouble(startX), Double.parseDouble(startY));
    coordinates[1] = new Coordinate(Double.parseDouble(endX), Double.parseDouble(endY));
    LineString lineString = geometryFactory.createLineString(coordinates);
    return lineString;
  }

  private static Polygon createPolygonFromCircleElement(Element element) {
    String centerX = element.getAttribute("CenterX");
    String centerY = element.getAttribute("CenterY");
    String radius = element.getAttribute("Radius");
    Coordinate centerCoordinate = new Coordinate(Double.parseDouble(centerX), Double.parseDouble(centerY));
    double radiusValue = Double.parseDouble(radius);
    Polygon circlePolygon = createCirclePolygon(centerCoordinate, radiusValue);
    return circlePolygon;
  }

  private static Polygon createCirclePolygon(Coordinate center, double radius) {
    int numPoints = 32;
    Coordinate[] coordinates = new Coordinate[numPoints + 1];
    for (int i = 0; i < numPoints; i++) {
      double angle = ((double) i / (double) numPoints) * Math.PI * 2.0;
      double x = radius * Math.cos(angle) + center.x;
      double y = radius * Math.sin(angle) + center.y;
      coordinates[i] = new Coordinate(x, y);
    }
    coordinates[numPoints] = coordinates[0];
    LinearRing ring = geometryFactory.createLinearRing(coordinates);
    Polygon polygon = geometryFactory.createPolygon(ring, null);
    return polygon;
  }

  private static SimpleFeatureType createFeatureType() {
    SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
    builder.setName("Feature");
    builder.add("geometry", Geometry.class);
    SimpleFeatureType featureType = builder.buildFeatureType();
    return featureType;
  }

  private static void writeFeaturesToShp(SimpleFeatureCollection features, String shpFileName) throws IOException {
    File shapefile = new File(shpFileName);
    Map<String, Serializable> connectParams = new HashMap<String, Serializable>();
    connectParams.put("url", shapefile.toURI().toURL());
    connectParams.put("create spatial index", Boolean.TRUE);
    DataStoreFactorySpi factory = new ShapefileDataStoreFactory();
    DataStore dataStore = factory.createNewDataStore(connectParams);
    SimpleFeatureType featureType = createFeatureType();
    dataStore.createSchema(featureType);
    String typeName = dataStore.getTypeNames()[0];
    SimpleFeatureSource featureSource = dataStore.getFeatureSource(typeName);
    if (featureSource instanceof SimpleFeatureStore) {
      SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;
      featureStore.addFeatures(features);
    }
    dataStore.dispose();
  }
}

请根据您的具体需求进行修改和裁剪，特别是在创建地理空间对象时使用不同的代码。

matlab shp 如何使用

在Matlab中使用shp文件，可以使用shaperead函数来读取shp文件。例如，使用shaperead函数读取shp文件的代码如下：

buffer_shp = shaperead(bufferpath);

其中，bufferpath是shp文件的路径。这样就可以将shp文件中的数据读取到一个结构体数组中，每个结构体代表一个要素。

另外，如果你想生成shp文件，可以使用shapewrite函数。下面是一个示例代码：

S(1).Geometry = 'Polygon';
S(1).BoundingBox = \[116,29; 117,28\];
S(1).X = \[116,116,117,117,116, NaN\]; % 经度 lon
S(1).Y = \[29,28,28,29,29, NaN\]; % 纬度 lat
S(1).Id = 1;

S(2).Geometry = 'Polygon';
S(2).BoundingBox = \[114,25; 115,24\];
S(2).X = \[114,114,115,115,114, NaN\]; % 经度 lon
S(2).Y = \[25,24,24,25,25, NaN\]; % 纬度 lat
S(2).Id = 2;

shapewrite(S,'test.shp');

这段代码会生成一个名为test.shp的shp文件，其中包含两个多边形要素。每个要素都有自己的经纬度坐标和其他属性。

希望这些代码能帮助到你使用Matlab处理shp文件。
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