查找数据差距并拆分为更多轨道
Find data gaps and split in more tracks
我有一些动物的追踪数据，我想知道我的追踪是否在每个 id 的卫星传输中有超过 1 天的间隔。
并且，如果有的话，我需要将相同 ID 的曲目拆分为 2 个或更多子曲目。所以，有些人会不止一次爆发。
我的数据是这样的（dput）：
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首先，我们可以计算每次采样之间的天数：
gap_days<-vector() #Create an empty vector we will fill in later
for (i in 1:dim(df)[1]){ #Iterate of each row in your dataframe
if (i==1){
gap_days<-c(gap_days,NA) #For the first observation there is no gap
} else if (df$id[i] != df$id[i-1]){
gap_days<-c(gap_days,NA) #For the first observation of a new ID there is no gap
} else {
gap_days<-c(gap_days,difftime(df$date[i],df$date[i-1], units = "days")[[1]]) #Calculate the time between observations in days
}
}
df<-cbind(df,gap_days) #Bind our new column onto your data
Over1Day<-subset(df, gap_days > 1) #Save a dataframe of those observations of more than 1 day
Over1Day #print that df to the screen
id date lc lon lat gap_days
20162.03 2003-10-21 12:19:00 1 -38.517 -18.253 1.906944
20162.03 2003-10-23 10:33:00 B -38.674 -19.824 1.654861
20162.03 2003-11-02 08:14:00 B -42.084 -24.071 9.598611
我不确定您所说的需要将同一 id 的曲目分成 2 个或更多 sub-tracks 是什么意思，有些人会有不止一个爆发，但我希望这能让您开始。
我有一些动物的追踪数据，我想知道我的追踪是否在每个 id 的卫星传输中有超过 1 天的间隔。
并且，如果有的话，我需要将相同 ID 的曲目拆分为 2 个或更多子曲目。所以，有些人会不止一次爆发。
我的数据是这样的（dput）：
structure(list(id = c("20162.03", "20162.03", "20162.03", "20162.03",
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首先，我们可以计算每次采样之间的天数：
gap_days<-vector() #Create an empty vector we will fill in later
for (i in 1:dim(df)[1]){ #Iterate of each row in your dataframe
if (i==1){
gap_days<-c(gap_days,NA) #For the first observation there is no gap
} else if (df$id[i] != df$id[i-1]){
gap_days<-c(gap_days,NA) #For the first observation of a new ID there is no gap
} else {
gap_days<-c(gap_days,difftime(df$date[i],df$date[i-1], units = "days")[[1]]) #Calculate the time between observations in days
}
}
df<-cbind(df,gap_days) #Bind our new column onto your data
Over1Day<-subset(df, gap_days > 1) #Save a dataframe of those observations of more than 1 day
Over1Day #print that df to the screen
id date lc lon lat gap_days
20162.03 2003-10-21 12:19:00 1 -38.517 -18.253 1.906944
20162.03 2003-10-23 10:33:00 B -38.674 -19.824 1.654861
20162.03 2003-11-02 08:14:00 B -42.084 -24.071 9.598611
我不确定您所说的需要将同一 id 的曲目分成 2 个或更多 sub-tracks 是什么意思，有些人会有不止一个爆发，但我希望这能让您开始。