hoopoe2: Sunrise and sunset times: From light intensity measurement...

In GeoLight: Analysis of Light Based Geolocator Data

Description

Sunrise and sunset times derived from light intensity measurements over time (hoopoe1). The light measurements corresponding to the first part of the annual migration of a European Hoopoe (Upupa epops).

Format

A table with 340 rows and 3 columns. Each row corresponds to subsequent twilight events ("tFirst" and "tSecond"). The third column ("type") indicates weather the first event is sunrise (1) or sunset (2). All dates/times are measured in Universal Time Zone (UTC).

Source

Baechler, E., Hahn, S., Schaub, M., Arlettaz, R., Jenni, L., Fox, J.W., Afanasyev, V. & Liechti, F. (2010) Year-Round Tracking of Small Trans-Saharan Migrants Using Light-Level Geolocators. Plos One, 5.

Examples

data(hoopoe2)
 hoopoe2$tFirst <- as.POSIXct(hoopoe2$tFirst, tz = "GMT")
 hoopoe2$tSecond <- as.POSIXct(hoopoe2$tSecond, tz = "GMT")
coord <- coord(hoopoe2, degElevation=-6)
## plot in a map using package maps
# par(oma=c(5,0,0,0))
# map(xlim=c(-20,40),ylim=c(-10,60),interior=F,col="darkgrey")
# map(xlim=c(-20,40),ylim=c(-10,60),boundary=F,lty=2,col="darkgrey",add=T)
# mtext(c("Longitude (degrees)","Latitude (degrees)"),side=c(1,2),line=c(2.2,2.5),font=3)
# map.axes()
# points(coord,col="brown",cex=0.5,pch=20)

Example output

Loading required package: maps
Note: Out of 340 twilight pairs, the calculation of 22 latitudes failed (6 %)

GeoLight documentation built on May 1, 2019, 8 p.m.