[Proj] ntf_r93.gsb file corrupted

Eric Miller EMiller at dfg.ca.gov
Thu Sep 24 17:17:44 EST 2009

>>> On 9/24/2009 at 11:49 AM, Frank Warmerdam <warmerdam at pobox.com>
> Cuinet Jérôme wrote:
>> A question :
>> Are not there some coordinate transformation tests which verifiy the

>> calculations ?
>> I don't know how often mistakes appears, but this type of tests
don't seems 
>> to be diificult to construct.
> Jérôme,
> There are regression tests, but they do not include ntf_r93.gsb even
> I would add the problem corrupted the file in a relatively subtle way
> would only be detected for a grid shift in some places.

Wouldn't it be better to use md5 checksums or digital signatures to
verify that a data file's contents haven't been altered?  The md5 sum
approach doesn't provide much security, but it can be a quick
verification check that something hasn't gone horribly wrong with the

md5sum ntf_r93.gsb > ntf_r93.gsb.md5sum

md5sum -c ntf_r93.gsb.md5sum

Or some variation...


Eric G. Miller
Staff Programmer
CA Dept. of Fish & Game

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