Hi,

Maybe I made an error somewhere, but I can't find where !
There is differences when I calculated the area of a rectangular polygon
and the value calculated by the function Polygon.

Sorry for the large precision numbers, but I tested if it was due to a
rounding error.

Hope you can enlighten me.

Thanks.

Arnaud

##########################################

Sr1 = Polygon(cbind(c(526253.713768354034983, 526248.093571954057552,
    526458.286270954064094 , 526463.906467354041524,
526253.713768354034983),
    c(5242206.17401464004070,5242528.15709813963622,5242531.82599973957986,
    5242209.84291623998433, 5242206.17401464004070)))

# Area indicated in Sr1 = 67699.11

Width <- abs(526253.713768354034983 - 526463.906467354041524)
Length <- abs(5242206.17401464004070 - 5242528.15709813963622)

Width * Length

# Area calculated (rectangular area) = 67678.49

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