Welcome to GISWeekly! In a press release this week, LizardTech, a division of Celartem, Inc., announced that the OGC has officially adopted the GMLJP2 standard proposed by LizardTech and Galdos Systems and a consortium of leading aerospace and geospatial technology companies. Jon Skiffington, product manager for LizardTech's GeoExpress, talks about the new non-proprietary standard for delivering and displaying large geospatial imagery.
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Susan Smith, Managing Editor
OGC Adopts GMLJP2 Standard
By Susan Smith
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Jon Skiffington, product manager for GeoExpress, answered some questions for us about the announcement and what this means to geospatial users:
1) Last year LizardTech announced that they were working to extend Oracle Spatial 10g GeoRaster architecture to integrate native MrSID technology inside Oracle. This was said to be a precursor to bringing LizardTech closer toward providing JPEG2000 support for Oracle Spatial 10g in the future. Does the GMLJP2 standard adoption further that goal and if so, how, specifically?
JS: We feel that this will accelerate the adoption of JPEG 2000 for geospatial raster imaging, allowing increased interoperability between systems. While Oracle Spatial can not make use of GMLJP2 natively, LizardTech will work to make sure that GML metadata in JPEG 2000 files is preserved in the Oracle database.
2) Will the products created using the GMLJP2 standard be dependent in any way on Oracle?
JS: While we anticipate that JPEG 2000 imagery will be stored within Oracle, GMLJP2 is a non-proprietary OGC standard. This means that the number of applications that will support GMLJP2 is limited only by the number of organizations that choose to build support for it.
3) What is the difference between GeoExpress 6 "supporting JP2" and what the GMLJP2 standard allows?
JS: When the current version of GeoExpress was released, GMLJP2 had not yet been adopted. Therefore, LizardTech products currently support JPEG 2000 with geospatial metadata stored internally in GeoTIFF or MrSID style, or externally in a JPEG 2000 world (.j2w) file. With the adoption of GMLJP2, new versions of GeoExpress and other LizardTech products will use the OGC GML standard, in addition to the other interim methods. This should save users any problems with applications that are expecting different types of metadata, and also opens the potential in the future for more advanced metadata such as detailed sensor models, in-depth camera positioning information (camera angle, date and time, orbit track), and image quality information such as cloud cover and air quality at the time of image capture.
The OpenGIS(R) GML in JPEG 2000 for Geographic Imagery (GMLJP2) Implementation Specification. It is available for download.
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