From 5bd065c98ecf28278c8ecbd3170e94a9cdd7a10f Mon Sep 17 00:00:00 2001
From: St33v <github@f3rr3t.com>
Date: Tue, 4 Jan 2022 11:03:09 +1100
Subject: bare bones

---
 notes.txt        | 25 +++++++++++++++++++++++++
 synopticChart.sh | 26 ++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 notes.txt
 create mode 100755 synopticChart.sh

diff --git a/notes.txt b/notes.txt
new file mode 100644
index 0000000..47a8324
--- /dev/null
+++ b/notes.txt
@@ -0,0 +1,25 @@
+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
+
diff --git a/synopticChart.sh b/synopticChart.sh
new file mode 100755
index 0000000..75d2ae2
--- /dev/null
+++ b/synopticChart.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+# SJP 28 Nov 2021
+# Get synoptic weather charts from BOM and make them into a movie
+# See notes about BOM. they don't like scrapers but permit anon FTP
+# for *personal use*
+#  This script will be called froma timer, once every 6 hours, which is 
+# how oftern new charts are published.
+#
+# The timer will take care of scheduing the call to the script
+# todo: check what happens with daylight saving...
+
+# Construct current date and time
+# -u for UTC, just get the date portion. 
+datePart=$(date -u +%Y%m%d)
+
+# Now construct the 'time' pertion of the filename.
+# It is always 0000, 0600, 1200, or 1800
+
+timePart=0000
+currentchart=${datePart}-${timePart}
+latestChart=IDY00030.${datePart}${timePart}.pdf
+
+
+curl -o ${latestChart} ftp://ftp.bom.gov.au/anon/gen/fwo/${latestChart}
+convert -density 300 ${latestChart} ${currentchart}.png
+
-- 
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