fluidPage(
fluidRow(
bs4Box(
title="Settings",
width=4,
numericInput("dstTrgt2", h5("Distance to target"),
min=0, step=1, value=100),
selectInput("unitDst2", h5("Measurement unit distance"),
choices=unitsDst, selected=2),
textInput("angszeAng2", h5("Angular size"),
value=c("1 2 3")),
selectInput("angszeUnitAng2", h5("Unit angular size"),
choices=unitsAng, selected=2),
h4("Output"),
selectizeInput("angszeUnitAbsOut2", h5("Unit absolute size"),
choices=unitsAbs, multiple=TRUE, selected=c(2, 6))
),
bs4Box(
title="Convert angular diameter to absolute size",
width=8,
verbatimTextOutput("ang2Abs"),
h6("Math"),
p("Absolute object size \\(s\\) can be calculated from angular
diameter and distance to target \\(d\\), assuming that the
argument for \\(\\tan(\\cdot)\\) and the
result from \\(\\arctan(\\cdot)\\) are in radian, and that
distance to target \\(d\\) and object size \\(s\\) are measured
in the same unit:"),
HTML("<ul>
<li>From angle \\(\\alpha\\) in degree: \\(s = 2 \\cdot d \\cdot
\\tan\\left(\\alpha \\cdot \\frac{\\pi}{360}\\right)\\)</li>
<li>From angle \\(\\alpha\\) in MOA: \\(s = 2 \\cdot d \\cdot
\\tan\\left(\\alpha \\cdot \\frac{\\pi}{60 \\cdot 360} \\right) = 2 \\cdot d \\cdot
\\tan\\left(\\alpha \\cdot \\frac{\\pi}{21600}\\right)\\)</li>
<li>From angle \\(\\alpha\\) in SMOA: \\(s = \\frac{21600}{\\pi} \\cdot
\\arctan\\left(\\frac{1}{7200}\\right) \\cdot 2 \\cdot d \\cdot
\\tan\\left(\\alpha \\cdot \\frac{\\pi}{21600}\\right)\\)</li>
<li>From arc length \\(x\\) in rad: \\(s = 2 \\cdot d \\cdot \\tan\\left(x
\\cdot \\frac{1}{2}\\right)\\)</li>
<li>From arc length \\(x\\) in mrad: \\(s = 2 \\cdot d \\cdot \\tan\\left(x
\\cdot \\frac{1}{2000}\\right)\\)</li>
<li>From arc length \\(x\\) in NATO mil: \\(s = 2 \\cdot d \\cdot \\tan\\left(x
\\cdot \\frac{\\pi}{6400}\\right)\\)</li>
</ul>")
)
)
)
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