Hi everyone.
There is a problem when I use SNAP10 for Co-registration with DEM data. It seems that the downloaded file of DEM is corrupted. Is this caused by the server or download network issue?
Error logs:
INFO: org.esa.snap.core.dataop.dem.ElevationFile: http retrieving http://step.esa.int/auxdata/dem/SRTMGL1/N39E116.SRTMGL1.hgt.zip
SEVERE: org.esa.snap.core.dataop.dem.ElevationFile: zip END header not found
INFO: org.esa.snap.core.dataop.dem.ElevationFile: http retrieving http://step.esa.int/auxdata/dem/SRTMGL1/N40E116.SRTMGL1.hgt.zip
SEVERE: org.esa.snap.core.dataop.dem.ElevationFile: zip END header not found
INFO: org.esa.snap.core.dataop.dem.ElevationFile: http retrieving http://step.esa.int/auxdata/dem/SRTMGL1/N40E117.SRTMGL1.hgt.zip
Thanks.
Hi @applepie1026,
Have you also tried to download the files from a browser or from command line? Is the download completed successfully?
@diana_harosa Yes, I have downloaded the DEM files using the URL in my local browser and put them into the auxdata file (.snap/auxdata/dem/SRTM 1Sec HGT). But this doesn’t work well. Then I have also used STRM 3Sec as DEM data, unfortunately, it still doesn’t work well. Here are the error logs:
INFO: org.esa.snap.core.dataop.dem.ElevationFile: http retrieving https://download.esa.int/step/auxdata/dem/SRTM90/tiff/srtm_60_05.zip
zip END header not found
java.lang.NullPointerException
90% done.
org.esa.snap.core.gpf.OperatorException: zip END header not found
at org.esa.snap.core.gpf.graph.GraphProcessor$GPFImagingListener.errorOccurred(GraphProcessor.java:389)
at com.sun.media.jai.util.SunTileScheduler.sendExceptionToListener(Unknown Source)
at com.sun.media.jai.util.SunTileScheduler.scheduleTile(Unknown Source)
at javax.media.jai.OpImage.getTile(Unknown Source)
at javax.media.jai.PlanarImage.getData(Unknown Source)
at com.bc.ceres.glevel.MultiLevelImage.getData(MultiLevelImage.java:64)
at org.esa.snap.core.gpf.internal.OperatorContext.getSourceTile(OperatorContext.java:449)
at org.esa.snap.core.gpf.internal.OperatorContext.getSourceTile(OperatorContext.java:435)
at org.esa.snap.core.gpf.Operator.getSourceTile(Operator.java:433)
at eu.esa.sar.sentinel1.gpf.TOPSARDeburstOp.computeTileInOneSwathFloat(TOPSARDeburstOp.java:904)
at eu.esa.sar.sentinel1.gpf.TOPSARDeburstOp.computeTileStack(TOPSARDeburstOp.java:811)
at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeRect(OperatorImageTileStack.java:122)
at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeTile(OperatorImageTileStack.java:86)
at com.sun.media.jai.util.SunTileScheduler.scheduleTile(Unknown Source)
at javax.media.jai.OpImage.getTile(Unknown Source)
at javax.media.jai.PlanarImage.getData(Unknown Source)
at com.bc.ceres.glevel.MultiLevelImage.getData(MultiLevelImage.java:64)
at org.esa.snap.core.gpf.internal.OperatorContext.getSourceTile(OperatorContext.java:449)
at org.esa.snap.core.gpf.internal.OperatorContext.getSourceTile(OperatorContext.java:435)
at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeRect(OperatorImageTileStack.java:116)
at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeTile(OperatorImageTileStack.java:86)
at com.sun.media.jai.util.SunTileScheduler.scheduleTile(Unknown Source)
at javax.media.jai.OpImage.getTile(Unknown Source)
at com.sun.media.jai.util.RequestJob.compute(Unknown Source)
at com.sun.media.jai.util.WorkerThread.run(Unknown Source)
Caused by: org.esa.snap.core.gpf.OperatorException: zip END header not found
at org.esa.snap.engine_utilities.gpf.OperatorUtils.catchOperatorException(OperatorUtils.java:434)
at eu.esa.sar.sentinel1.gpf.BackGeocodingOp.computeTileStack(BackGeocodingOp.java:520)
at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeRect(OperatorImageTileStack.java:122)
at org.esa.snap.core.gpf.internal.OperatorImageTileStack.computeTile(OperatorImageTileStack.java:86)
… 23 more
Caused by: java.util.zip.ZipException: zip END header not found
at java.base/java.util.zip.ZipFile$Source.zerror(ZipFile.java:1607)
at java.base/java.util.zip.ZipFile$Source.findEND(ZipFile.java:1497)
at java.base/java.util.zip.ZipFile$Source.initCEN(ZipFile.java:1504)
at java.base/java.util.zip.ZipFile$Source.(ZipFile.java:1308)
at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1271)
at java.base/java.util.zip.ZipFile$CleanableResource.(ZipFile.java:733)
at java.base/java.util.zip.ZipFile$CleanableResource.get(ZipFile.java:850)
at java.base/java.util.zip.ZipFile.(ZipFile.java:248)
at java.base/java.util.zip.ZipFile.(ZipFile.java:177)
Does it seem that there are some problems with JAVA?
The error says it cannot find the end of the END header of the zip - perhaps the zip is corrupted or not complete?
Although, I put the DEM files downloaded from my local browser which are healthy into the auxdata path, the process of downloading DEM repeats again and covers the existing DEM file.
Jira ticket SNAP-3695 created.
Hi, Diana, I may have probably solved this problem. I deleted the oringal .snap file generated from snappy-conf of SNAP10 and did the process of Co-registration again, the DEM file can be correctly downloaded and read now. Maybe this is caused by the construct of the original .snap file when configuring Python to use the new SNAP-Python (esa_snappy) interface (SNAP version 10+).
The new .snap file is as below:
Thanks for your records.