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From "Martin Desruisseaux (Jira)" <j...@apache.org>
Subject [jira] [Closed] (SIS-407) OutOfMemoryError when reading Sentinel 1 image with GeoTIFF reader
Date Sun, 20 Oct 2019 19:27:00 GMT

     [ https://issues.apache.org/jira/browse/SIS-407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux closed SIS-407.
-----------------------------------

> OutOfMemoryError when reading Sentinel 1 image with GeoTIFF reader
> ------------------------------------------------------------------
>
>                 Key: SIS-407
>                 URL: https://issues.apache.org/jira/browse/SIS-407
>             Project: Spatial Information Systems
>          Issue Type: Bug
>          Components: Storage
>    Affects Versions: 0.8
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Major
>             Fix For: 1.0
>
>
> When opening a Sentinel 1 GeoTIFF image, the call to {{DataStore.getMetadata()}} cause
the JVM to attempt to allocate about one gigabyte of memory. This is not caused by the image
size, but rather by a mathematical error. In the {{LocalizationGridBuilder}} class, private
method {{infer}} computes the greatest common divisor of _X_ and _Y_ translations from the
grid origin. Sentinel 1 image have control points spaced by 1320 pixels on the _X_ axis, except
the very last point which is only 1302 pixels after the previous one. This cause {{LocalizationGridBuilder}}
to find a much smaller common divisor than expected (6 instead of 1320), which cause it to
attempt to create a localization grid much larger than it should be.



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