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Notes on FTP 'scraper' for synoptic charts
SJP 28 Nov 2021
host : zero
(home theatre PC Raspberry pi 4)
# Background
I had been musing about making videos of the BOM synoptic charts for some time.
(I may have started this work elsewhere but here I am, proctrasinating instead of doing housework)
It was prompted by a rude message I got yesterday while innocently opening the BOM radar. It accused me of scraping.
It also directed me to the FTP site:
pdf file is the one to get. It is a svg image, which can provide higher resolutio than the supplied png file.
I have a vague memory of alredy going down this track, but not on the ftp site.
used ImageMagick convert to make the pdf into a png.
But I got an error. Apparently PDF can be hacked so this line was in
/etc/Imagemagick7/policy.xml
Advice from internet was to comment it out like this:
<!-- <policy domain="delegate" rights="none" pattern="gs" /> -->
That worked
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