2022-06-24 11:59:06 +02:00
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libecwj2 is a library that gives support to GDAL for reading, import,
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and convert raster geospatial data in non-free ECW and JPEG 2000
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formats. This library was released as free and open source in 2006 by
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Earth Resource Mapping, formerly owner of ECW patents.
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ECW (Enhanced Compression Wavelet) is a full proprietary standard of
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compression image format.
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JPEG 2000 (or JP2) is a similar standard under free concession but
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protected by patents in some parts.
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Both the formats are more powerful than other formats in lossy
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compression of large image data without significant losses of quality,
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but are mainly accessible through proprietary software, specially to
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manage geospatial data.
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libecwj2 is the only one free and open source library that includes
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the support to these formats in GDAL and indirectly in platforms that
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require it as dependency (i.e. QGIS and Orfeo Toolbox). GDAL can be
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also used to convert ECW or JP2 files in other graphic formats.
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After the installation, to apply the support to ECW/JP2 formats, GDAL
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must be rebuilt without any other setting: libecwj2 is an optional
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dependency autodetected.
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To verify if the plugin is enabled, you can launch the following
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command:
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$ gdalinfo --formats | grep ECW
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2022-07-08 06:48:55 +02:00
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If the plugin is successfully enabled, this command returns
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2022-06-24 11:59:06 +02:00
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ECW -raster- (rw): ERDAS Compressed Wavelets (SDK 3.x)
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JP2ECW -raster,vector- (rw+v): ERDAS JPEG2000 (SDK 3.x)
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