NTF 2 4 8 16 32 64 then ran the script: The original embedded jp2 image has 5 levels, which is accounted as the part of 7 levels. I will investigate this angle in case it is the same problem. However I have encountered a problem with multi-image jpeg compressed nitf files with finding overviews once they are built. Closed 9 years ago. I do not have any multi-image jpeg encoded nitf files.
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The path issue has been handled via I do not have any multi-image jpeg encoded nitf files.
Also, the overviews were built for 7 levels, but only 2 levels were actually built in the. When opening the first subdataset, it goes into the “if” branch, and it can’t find the external overview file. As far as I can establish everything is working fine. Frank, It didn’t work for me because my. However I have encountered a problem with multi-image jpeg compressed nitf files gadl finding overviews once they are built.
Initialize poDS, pszFilename. I will investigate this angle in case it is the same problem. Opened 9 years ago Closed 9 years ago Last modified 9 years ago. I believe all issues specific to this ticket are corrected.
NITF — National Imagery Transmission Format
I haven’t worked out how to make this work yet All this is aimed at ensuring external overviews vdal nitf files are handled at the nitfdataset level primarily so that information about them can be properly saved to the. TestUseBlockIO to avoid directio if there are appropriate external overviews available in trunk r and 1. Closed 9 years ago. NTF the ovr path E: Briefly, when subdatasets are not in play, the jpeg dataset’s ovmanager can actually find the abc. It didn’t work for me gdao my.
But in the jpeg in a subdataset case we ggdal access to the NITF file’s. Visit the Trac open source project at http: Gao, Would you mind creating a new ticket for this? While investigating a found some situations with non-jpeg datastreams in the nitf file that buildoverviews can get into a recursive infinite loop and crash.
NITF — Advanced Driver Information
I don’t actually have a jpeg nitf file with multiple images though, so I only sort-of tested this case using multi-jpeg image nitf files. Download in other formats: Before this I also manually edited the original. Opened 9 years ago.
Let me know if problems persist. Show comments Show property changes.
However, it should be noted that the file has only small overviews so it was necessary to make a read request with dramatic decimation before the overviews kick in. I have not ported these changes into the 1. Oldest first Newest first Threaded. It still gcal find the newly created ovr.
The problem seems to be that the stored ovr path at the time of overview creation is a local path, something like: I assume this could arise with any of the overview-on-subdataset situations including uncompressed multi-image nitf, netcdf, hdf4, etc. I jpeg and jpeg compressed nitf files are likely running into the same problem.
With this change external overviews on nitf files with or without internal jpeg or jpeg compression and with or without subdatasets should work.