[英]vectorize polygon using JTS with range lookup
我嘗試使用Java(即帶有JAI的geotools)對圖像進行矢量化。
代碼很小,在intelliJ中運行得很好
InputStream stringAsStream = new ByteArrayInputStream(inputAsciiGrid.getBytes(StandardCharsets.UTF_8));
SimpleFeatureIterator vectorizedFeatures = extractor.execute(input, 0, true, null,
null, classificationRanges, null).features();
我的問題是通過maven執行此操作時:
mvn clean package && \
java -jar target/quickstart-1.0.jar
它失敗了,除了
RangeLookup: No OperationDescriptor is registered in the current operation registry under this name
示例代碼可以在https://github.com/geoHeil/jts-vectorize找到
注意,jar包含類,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
我試圖遵循java.lang.ClassNotFoundException:it.geosolutions.jaiext.range.Range並添加
<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>
這會將異常更改為:
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
盡管班級還在那里:
geoheil@geoheilsMacBook ~/Downloads/vectorize/jts-vectorize [20:36:45]
> $ jar -tf target/quickstart-1.0.jar| grep ImageLayout2 [±master ●●]
org/jaitools/imageutils/ImageLayout2.class
這似乎是一個版本不匹配。 還原和添加( https://github.com/geotools/geotools/blob/18.4/pom.xml#L97 )中列出的版本時:
<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>
錯誤也是最初的錯誤。
手動注冊缺少的操作描述符:
<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>
並添加兩個文件(見上面的名稱),內容為:
# --- JAI ext manual re-registration ---
descriptor it.geosolutions.jaiext.rlookup.RangeLookupDescriptor
給了我一個新的例外:
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)
但是,這不一定被認為是進步,即使現在甚至IntelliJ都無法啟動。 由於空指針異常,它失敗了: ExceptionInInitializerError
我認為描述符的配置是從registryFile.jai
文件中讀取的。(*)
當創建具有依賴項的jar時,registryFile.jai文件將被最后一個jar的內容覆蓋。 將registryFile.jai內容與添加到shade插件的以下配置合並可以解決此問題。 (這是添加到你提供的github源碼)
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/registryFile.jai</resource>
</transformer>
(無需在項目資源/ META-INF文件夾中創建registryFile.jai。)
(*)我嘗試將配置添加到不同的命名文件,但沒有找到描述符。 即使嘗試OperationRegistry.updateFromStream(是); 命令沒有用。
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