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Reported by lczub on 7 Jul 2009 20:54 UTC
I find following not clear behaviour of cs2cs during a typing error.
I was surprised, that the declaration with the wrong parameter '+nadgrid=' has another effect as the declaration of the correct parameter '+nadgrids=' with a non existing NTv2 file (see test b+c vs d).
My expectation was, that test b+c+d should use the same default datum shift parameter, but this is not the case.
A description for '+nadgrid=' could not be found in ProjAPI. What is the impact of this parameter?
=== Test A: declaring existing ntv2 file with correct param +nadgrids ===
Expectation: 399340.601863 5928794.177992 -> ok
=== Test B: declaring existing ntv2 file with typing error param +nadgrid ===
Expectation: great delta to Test A, cause wrong param nadgrid should be interpreted as missing datum shift -> why is the delta so small?
=== Test C: declaring non existing ntv2 file with typing error param +nadgrid ===
Expectation: great delta to test A, cause wrong param nadgrid should be interpreted as missing datum shift -> why is the delta so small?
=== Test D: declaring non existing ntv2 file with correct param +nadgrids ===
Expectation: great delta to test A, cause missing ntv2 file should be interpreted as missing datum shift -> ok
Reported by lczub on 7 Jul 2009 20:54 UTC
I find following not clear behaviour of cs2cs during a typing error.
I was surprised, that the declaration with the wrong parameter '+nadgrid=' has another effect as the declaration of the correct parameter '+nadgrids=' with a non existing NTv2 file (see test b+c vs d).
My expectation was, that test b+c+d should use the same default datum shift parameter, but this is not the case.
A description for '+nadgrid=' could not be found in ProjAPI. What is the impact of this parameter?
=== Test A: declaring existing ntv2 file with correct param +nadgrids ===
Expectation: 399340.601863 5928794.177992 -> ok
=== Test B: declaring existing ntv2 file with typing error param +nadgrid ===
Expectation: great delta to Test A, cause wrong param nadgrid should be interpreted as missing datum shift -> why is the delta so small?
=== Test C: declaring non existing ntv2 file with typing error param +nadgrid ===
Expectation: great delta to test A, cause wrong param nadgrid should be interpreted as missing datum shift -> why is the delta so small?
=== Test D: declaring non existing ntv2 file with correct param +nadgrids ===
Expectation: great delta to test A, cause missing ntv2 file should be interpreted as missing datum shift -> ok
Migrated-From: https://trac.osgeo.org/proj/ticket/46
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