java 使用geotools统计shapefile文件里的地类面积
时间: 2023-02-05 20:56:07 浏览: 84
可以使用以下步骤来统计shapefile文件中地类面积:
1. 使用java.io.FileInputStream打开shapefile文件,读取文件数据。
2. 使用org.geotools.data.shapefile.ShapefileDataStoreFactory创建ShapefileDataStore。
3. 使用ShapefileDataStore的getFeatureSource方法获取FeatureSource。
4. 使用FeatureSource的getFeatures方法获取所有的Feature。
5. 循环遍历所有的Feature,获取每个Feature的面积。可以使用org.geotools.geometry.jts.JTS的st_area方法计算面积。
6. 累加所有Feature的面积,得到shapefile文件中地类面积的总和。
下面是一个示例代码:
```java
import java.io.FileInputStream;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.geometry.jts.JTS;
import com.vividsolutions.jts.geom.Geometry;
public class ShapefileAreaExample {
public static void main(String[] args) throws Exception {
// 打开shapefile文件
FileInputStream inputStream = new FileInputStream("shapefile.shp");
// 创建ShapefileDataStore
ShapefileDataStoreFactory dataStoreFactory = new ShapefileDataStoreFactory();
ShapefileDataStore dataStore = (ShapefileDataStore) dataStoreFactory.createDataStore(inputStream);
// 获取FeatureSource
SimpleFeatureSource featureSource = dataStore.getFeatureSource();
// 获取所有的Feature
FeatureCollection<SimpleFeatureType, SimpleFeature> features = featureSource.getFeatures();
// 统计地类面积总和
double areaSum = 0;
try (FeatureIterator<SimpleFeature> featureIterator = features.features()) {
while (featureIterator.hasNext()) {
SimpleFeature feature = featureIterator.next();
Geometry geometry = (Geometry) feature.getDefaultGeometry();
double area = JTS.toGeometry(geometry.getEnvelopeInternal()).getArea();
areaSum += area;
}
}
// 输出地类面积总和
System.