r - 查找数据间隙并拆分更多轨道

Question

我有一些动物的跟踪数据，我想知道每个 ID 的卫星传输间隔是否超过 1 天。

而且，如果有的话，我需要将轨道分成 2 个或更多相同 ID 的子轨道。所以，有些人会有不止一次的爆发。

我的数据是这样的（dput）：

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Answer 1

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

我不确定您需要将轨道分成 2 个或更多子轨道以获取相同的 ID 是什么意思，有些人会有不止一个突发，但我希望这能让您开始。