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projections still broken #1640

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doutriaux1 opened this Issue Oct 27, 2015 · 4 comments

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doutriaux1 commented Oct 27, 2015

@aashish24 looking at baselines:
https://github.com/UV-CDAT/uvcdat-testdata/blob/master/baselines/vcs/test_vcs_basic_boxfill_aeqd_proj.png

You can see that the purple blob over africa gets cut at the 0 longitude.

@doutriaux1 doutriaux1 added this to the 2.4 milestone Oct 27, 2015

@aashish24 aashish24 assigned danlipsa and unassigned aashish24 Nov 9, 2015

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aashish24 commented Nov 13, 2015

@danlipsa it would be great if you can look into this next... thanks,

@aashish24 aashish24 modified the milestones: 3.0, 2.4 Nov 13, 2015

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aashish24 commented Nov 13, 2015

Actually never mind. @doutriaux1 this bug with these kind of projection will require some additional bug. Like I mentioned proj4 is doing the right thing. Either we have to know the projection and chop-off data before sending it for rendering or apply some stencil techniques before we tackle this one. I don't know if we have enough time to fix this for 2.4 but can look into it immediately. I think we should plan y for 2.4.1 release as well.

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danlipsa commented Dec 4, 2015

Note that vcs_test_basic_boxfill_-3_proj_NH seems to be also aeqd and that works fine. I'll have to look at the differences.

danlipsa added a commit that referenced this issue Dec 16, 2015

BUG #1640: Aeqd projection needs lat_0 and central meridian.
A side note is that the -3 = polar (non gctp) projection is
the same as aeqd projection though it has a different _type
(-3 versus 204)

danlipsa added a commit that referenced this issue Dec 16, 2015

BUG #1640: Aeqd projection needs lat_0 and central meridian
A side note is that the -3 = polar (non gctp) projection is
the same as aeqd projection though it has a different _type
(-3 versus 204)
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danlipsa commented Mar 10, 2016

After proj4.9.2 upgrade aeqd plots look better. We'll replace this PR with
#1876

@danlipsa danlipsa closed this Mar 10, 2016

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