camtrapsMultiSeason.RdExample multi-season camera trap station information table
data(camtrapsMultiSeason)A data frame with 7 rows and 8 variables
This is a general example of how information about camera trap stations from multiple seasons are arranged in camtrapR. It contains setup and retrieval dates, coordinates and a season identifier. If more than 1 camera was set up at a station (e.g. 2 cameras facing each other), a camera ID column must be added, with camera-specific information instead of station-specific information. If cameras malfunctioned repeatedly, additional pairs of problem columns can be added, e.g. "Problem2_from" and "Problem2_to" etc..
Note that season 2010 has an additional station (StationD). This is to simulate a situation where a station was not set up during an entire season.
The variables are as follows:
Station | Camera trap station ID |
utm_y | y coordinate of station (northing) |
utm_x | x coordinate of station (easting) |
Setup_date | camera trap setup date |
Retrieval_date | camera trap retrieval date |
Problem1_from | first day of camera malfunction |
Problem1_to | last day of camera malfunction |
session | Identified for trapping session / season |
The coordinates can be in the units of any coordinate system. UTM was chosen as an example, but it could be latlong or anything else, too. capthist objects (as created by spatialDetectionHistory for spatial capture-recapture analyses) expect the unit to be meters. capthist alse require session information as integer numbers starting with 1.
"Season" and "session" are used synonymously here. secr nomenclature is "session", in unmarked it is "season".
# data were created with the following code:
data(camtraps)
camtraps_season2 <- camtraps
# change 2009 to 2010
camtraps_season2[, "Setup_date"] <- gsub("2009", "2010", camtraps_season2[,
"Setup_date"])
camtraps_season2[, "Retrieval_date"] <- gsub("2009", "2010", camtraps_season2[,
"Retrieval_date"])
camtraps_season2[, "Problem1_from"] <- gsub("2009", "2010", camtraps_season2[,
"Problem1_from"])
camtraps_season2[, "Problem1_to"] <- gsub("2009", "2010", camtraps_season2[,
"Problem1_to"])
# add an extra station with different dates in session 2010
camtraps_season2 <- rbind(camtraps_season2, NA)
camtraps_season2$Station[4] <- "StationD"
camtraps_season2$utm_y[4] <- 607050
camtraps_season2$utm_x[4] <- 525000
camtraps_season2$Setup_date[4] <- "04/04/2010"
camtraps_season2$Retrieval_date[4] <- "17/06/2010"
camtraps_season2$Problem1_from[4] <- "20/05/2010"
camtraps_season2$Problem1_to[4] <- "30/05/2010"
# add season column
camtraps$session <- 2009
camtraps_season2$session <- 2010
# combine the tables for 2 seasons
camtrapsMultiSeason <- rbind(camtraps, camtraps_season2)