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List: r-sig-geo
Subject: [R-sig-Geo] Sirad for hourly extraterrestrial solar radiation
From: "Michele Fiori" <mfiori () arpa ! sardegna ! it>
Date: 2019-02-13 11:06:07
Message-ID: 003c01d4c38c$20bdbb90$623932b0$ () arpa ! sardegna ! it
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Hello everybody,
I use SIrad for estimating daily extraterrestrial solar radiation for
Sardinia using dem, in this way
DAY = "2019-02-13"
dem$Ra <- extrat(dayOfYear(DAY),
radians(dem$lat_250))$ExtraTerrestrialSolarRadiationDaily
now I need to map hourly values for specific hours, but when I calculate
$ExtraTerrestrialSolarRadiationHorly
I obtain the whole set of 24 values for each grid point, ma question is ..
how can I extract and plot only specific hourly values, for example maximum
values (12 o' clock)?
Thank you
Regards, Michele
Michele Fiori
ARPAS - Agenzia Regionale per la Protezione dell'Ambiente della Sardegna
Dipartimento Meteoclimatico - Servizio Meteorologico Agrometeorologico ed
Ecosistemi
Viale Porto Torres 119 - 07100 Sassari
Tel + 39 079 258617 Fax +39 262681
<http://www.sardegnaambiente.it/arpas> www.sardegnaambiente.it/arpas
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