java - 使用带有范围查找的 JTS 对多边形进行矢量化

Question

我尝试使用 java 对图像进行矢量化，即带有 JAI 的 geotools。

代码最少，在 intelliJ 中工作得很好

InputStream stringAsStream = new ByteArrayInputStream(inputAsciiGrid.getBytes(StandardCharsets.UTF_8));
SimpleFeatureIterator vectorizedFeatures = extractor.execute(input, 0, true, null,
                null, classificationRanges, null).features();

我的问题是通过 maven 执行此操作时，例如:

mvn clean package && \
    java -jar target/quickstart-1.0.jar

它失败了，除了

RangeLookup: No OperationDescriptor is registered in the current operation registry under this name

示例代码可以在 https://github.com/geoHeil/jts-vectorize 找到

请注意，jar 包含类，但不包含 META-INF/registry.jai 文件中的 OperationDescriptors。

jar -tf target/quickstart-1.0.jar| grep RangeLookupProcess                                                            
org/geotools/process/raster/RangeLookupProcess.class

编辑

我试着关注 java.lang.ClassNotFoundException: it.geosolutions.jaiext.range.Range 并添加了

<dependency>
            <groupId>it.geosolutions.jaiext.utilities</groupId>
            <artifactId>jt-utilities</artifactId>
            <version>1.1.8</version>
        </dependency>
        <dependency>
            <groupId>it.geosolutions.jaiext.iterators</groupId>
            <artifactId>jt-iterators</artifactId>
            <version>1.1.8</version>
        </dependency>

这会将异常更改为:

Exception in thread "main" java.lang.NoClassDefFoundError: it/geosolutions/jaiext/utilities/ImageLayout2
    at FooJava.getAsciiGridFromstring(FooJava.java:49)
    at FooJava.main(FooJava.java:35)
Caused by: java.lang.ClassNotFoundException: it.geosolutions.jaiext.utilities.ImageLayout2
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 2 more
make: *** [run-java] Error 1

即使类又在那里:

geoheil@geoheilsMacBook ~/Downloads/vectorize/jts-vectorize                                                                 [20:36:45]
> $ jar -tf target/quickstart-1.0.jar| grep ImageLayout2                                                                  [±master ●●]
org/jaitools/imageutils/ImageLayout2.class

这似乎是版本不匹配。 还原和添加也在 ( https://github.com/geotools/geotools/blob/18.4/pom.xml#L97 ) 中列出的版本时:

<properties>
    <geotools.version>18.4</geotools.version>
    <jaiext.version>1.0.16</jaiext.version>
</properties>
<dependencies>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-main</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-arcgrid</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-process-raster</artifactId>
            <version>${geotools.version}</version>
        </dependency>
        <dependency>
            <groupId>it.geosolutions.jaiext.utilities</groupId>
            <artifactId>jt-utilities</artifactId>
            <version>1.1.1</version>
        </dependency>

        <dependency>
            <groupId>it.geosolutions.jaiext.rlookup</groupId>
            <artifactId>jt-rlookup</artifactId>
            <version>${jaiext.version}</version>
        </dependency>

    </dependencies>

错误又是第一个。

编辑2

手动注册缺失的操作描述符:

<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/javax.media.jai.registryFile.jai</resource>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/registryFile.jaiext</resource>
                                </transformer>

并添加两个文件(见上面的名称)，内容为:

# --- JAI ext manual re-registration ---
descriptor  it.geosolutions.jaiext.rlookup.RangeLookupDescriptor

给我一​​个新的异常(exception):

java.lang.RuntimeException: - Unable to render RenderedOp for this operation.
        at javax.media.jai.RenderedOp.createInstance(RenderedOp.java:827)
        at javax.media.jai.RenderedOp.createRendering(RenderedOp.java:867)
        at javax.media.jai.RenderedOp.getRendering(RenderedOp.java:888)
        at javax.media.jai.RenderedOp$1.getPropertyNames(RenderedOp.java:1791)
        at javax.media.jai.PropertyEnvironment.mapDefaults(PropertyEnvironment.java:270)
        at javax.media.jai.PropertyEnvironment.getPropertyNames(PropertyEnvironment.java:125)
        at javax.media.jai.WritablePropertySourceImpl.addProperties(WritablePropertySourceImpl.java:298)
        at javax.media.jai.RenderedOp.createPropertySource(RenderedOp.java:1817)
        at javax.media.jai.RenderedOp.getPropertyNames(RenderedOp.java:1851)
        at javax.media.jai.PropertySourceImpl.<init>(PropertySourceImpl.java:143)
        at org.geotools.coverage.AbstractCoverage.<init>(AbstractCoverage.java:139)
        at org.geotools.coverage.grid.AbstractGridCoverage.<init>(AbstractGridCoverage.java:102)
        at org.geotools.coverage.grid.GridCoverage2D.<init>(GridCoverage2D.java:186)
        at org.geotools.coverage.grid.GridCoverageFactory.create(GridCoverageFactory.java:589)
        at org.geotools.process.raster.RangeLookupProcess.execute(RangeLookupProcess.java:208)
        at org.geotools.process.raster.RangeLookupProcess.execute(RangeLookupProcess.java:234)
        at org.geotools.process.raster.PolygonExtractionProcess.execute(PolygonExtractionProcess.java:167)
        at FooJava.getWktForDbRangeFromRaster(FooJava.java:57)
        at FooJava.main(FooJava.java:36)

然而，这并不一定算是进步，即现在连 IntelliJ 都无法启动。失败并显示:ExceptionInInitializerError 由于空指针异常

Answer 1

我认为描述符的配置是从 registryFile.jai 文件中读取的。(*)

当创建具有依赖项的 jar 时，registryFile.jai 文件将被最后一个 jar 的内容覆盖。 将 registryFile.jai 内容与添加到 shade 插件的以下配置合并可纠正此问题。 (这已添加到您提供的 github 源代码中)

<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
   <resource>META-INF/registryFile.jai</resource>
</transformer>

(无需在您的项目资源/META-INF 文件夹中创建 registryFile.jai。)

(*) 我尝试添加 configuration到不同的命名文件，它没有找到描述符。 即使尝试 OperationRegistry.updateFromStream(is);命令无效。