08 Jul METARs are reports assembled with a particular format that is easy to decode wi
METARs are reports assembled with a particular format that is easy to decode with computer systems using regular expressions
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Asked: Oct 7th, 2016
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Question Description
METARs are reports assembled with a particular format that is easy to decode with computer systems using regular expressions.
These reports typically come in two forms: North American METARs and International METARs. Create a series of regular expressions that decode each token of information using the North American METAR form.
Please see files and
Example.
#!/bin/bash
printf “Report type: ”
egrep -o ‘METAR|SPECI’ metar.txt
printf “Station: ”
egrep -o ‘\sK[A-Z]{3}\s’ metar.txt
day_of_month=$(( $(cat metar.txt | cut -c12-13) ))
metar_time=$(( $(cat metar.txt | cut -c14-17) ))
printf “Day of the month: %d\n” $day_of_month
printf “Time: %d Zulu\n” $metar_time
wind_dir=$(( $(egrep -o ‘\s[0-9]{5}G?[0-9]?[0-9]?KT\s’ metar.txt | cut -c2-4) ))
wind_spd=$(( $(egrep -o ‘\s[0-9]{5}G?[0-9]?[0-9]?KT\s’ metar.txt | cut -c5-6) ))
printf “Winds are from %d degrees at %d knots\n” $wind_dir $wind_spd
METAR|SPECI K[ALPHA]{3} [DIGIT]{6}Z AUTO|COR
_____ FIXED ___________________________ Optional
# wind conditions
[DIGIT]{5}G[DIGIT]{2}KT [DIGIT]{3}V[DIGIT]{3} | VRB[DIGIT]
– req — — opt — rq ——— opt ——-
### processing ###
1) read string, but if using math expansion, cut only digits
2) egrep (extended grep) with -o option returns only matched string (watch spaces with cut)
3) Add if/else logic to print correct message or no message if missing, or with optional branches
4) Add “Cloud cover” all categories
5) Add check and report for Thunder Storms and or rain (light/moderate/heavy)
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