Ticket #306 (new new task)

Opened 3 months ago

Last modified 3 months ago

NCEI archival drawings

Reported by: niles Owned by: niles
Priority: highest Milestone:
Component: Undefined Version: 1.4
Severity: blocker Keywords: NCEI
Cc:

Description

NCEI has PDF files of sun drawings online under :

https://www.ngdc.noaa.gov/stp/space-weather/solar-data/solar-imagery/composites/full-sun-drawings

These are mostly archival, although the Boulder ones seem to be out of SWPC and are still being updated. The ones that we should be serving out are likely to be the Wendelstein and Fraunhofer ones, which seems to be the most structured ones (and they cover a long time, too).

The only way to get the file sizes exactly is to download the data, I have done that, it's about 9G. Need to get this information into a database and develop a data provider.

Change History

comment:1 Changed 3 months ago by niles

One thing that came up was determining the resolution of the PDF files. It turns out that can be quite a rabbit hole, PDF files don't necessarily have a single resolution. One approach is to use the pdfinfo command :

$ pdfinfo wend_compo_fd_19660331.pdf
Creator:        Adobe Acrobat 7.1
Producer:       Adobe Acrobat 7.1 Image Conversion Plug-in
CreationDate:   Fri Jul 31 01:12:38 2009
ModDate:        Fri Jul 31 01:12:38 2009
Tagged:         no
UserProperties: no
Suspects:       no
Form:           none
JavaScript:     no
Pages:          1
Encrypted:      no
Page size:      832.14 x 584.82 pts
Page rot:       0
File size:      625583 bytes
Optimized:      no
PDF version:    1.6

And then assume it's about 832x585.

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