[postgis-devel] Issue 89 in postgis: transform() grid-shift 2nd chance logic defective

[codesite-noreply at google.com]

Comment #3 on issue 89 by mark.cav... at siriusit.co.uk: transform()  
grid-shift 2nd chance logic defective
http://code.google.com/p/postgis/issues/detail?id=89

Hi William,

I understand that in your case of a NAD83 -> NAD27 transformation, ignoring  
the datum
is an acceptable error to you, but I can't see this being the case with all
applications and all datum shifts. We see people being caught out a lot  
because
they've installed the grid shift files on one server (and not another) and  
wonder why
the results beween 2 servers are different.

 From a strictness point of view, I would argue that any transformation  
requested by
the user that cannot be achieved using the current installation should  
throw an ERROR
rather than trying to second-guess the user. At least then it would be very  
clear
that they need to re-install PROJ.4 rather than wondering why they are  
getting
erroneus results.

Frank, what are your thoughts on this?


ATB,

Mark.


--
You received this message because you are listed in the owner
or CC fields of this issue, or because you starred this issue.
You may adjust your issue notification preferences at:
http://code.google.com/hosting/settings