Problem with estimating COA

[Ryantheshark84]

Hey Ross, Have been using VTrack for some time but my most recent visit has highlighted an error when i try to run the HR Summary. The COA() produces a list with 17 dataframes but when i try to run the COAdata in the HR Summary i get this error.

===================| 100% Error in UseMethod("tbl_vars") : no applicable method for 'tbl_vars' applied to an object of class "c('matrix', 'logical')"

Any information would be most helpful.

[joleehaz]

I also have this issue. Did you manage to resolve it? @Ryantheshark84

[vinayudyawer]

Hi @joleehaz , Would you be able to provide a reproducible example?

[joleehaz]

Hi @vinayudyawer

Thank you for your quick response.

The error I am getting is the same as above when I run

> VEMCOdata<- read.csv("VEMCOdata.csv")
> taginfo<- read.csv("taginfo.csv")
> statinfo<- read.csv("statinfo.csv") 
> ATTdata <- setupData(Tag.Detections = VEMCOdata, 
+                      Tag.Metadata = taginfo, 
+                      Station.Information = statinfo, 
+                      source="VEMCO",
+                      tzone= "UTC")
Geographic projection for detection positions not recognised, reverting to WGS84 global coordinate reference system
> COAdata<-COA(ATTdata, 
+              timestep = 60, ## timestep bin used to estimate centers of activity (in minutes)
+              split = TRUE)
> COA(COAdata)
Error in UseMethod("left_join") : #this error message also occurs with sample data 
  no applicable method for 'left_join' applied to an object of class "NULL" 
> library(raster)
> proj<-CRS("+init=epsg:32743")
> ## HRSummary() requires calculation of COAs first
> ## Estimate 100% Maximum Convex Polygon (MCP) areas
> 
> mcp_est <- HRSummary(COAdata, 
+                      projCRS=proj, 
+                      type="MCP", 
+                      cont=100,
+                      sub = "%Y-%W")
  |=============================================================================================================| 100%
Error in UseMethod("tbl_vars") : 
  no applicable method for 'tbl_vars' applied to an object of class "c('matrix', 'logical')"
In addition: There were 34 warnings (use warnings() to see them)
> warnings()
Warning messages:
1: Factor `Tag.ID` contains implicit NA, consider using `forcats::fct_explicit_na`
2: Factor `Tag.ID` contains implicit NA, consider using `forcats::fct_explicit_na`

This error does not occur when I use the VTrack sample data so I should think it is something to do with the format of my .csv files although I have been very careful to ensure they are in the same format as the sample files. I am unable to share my data here as it is licenced. Would you mind communicating via email? We can then post the resolution here if we find one!

Thank you!

[vinayudyawer]

Hey @joleehaz,

Sounds like the function is having a hard time finding data from the input data frame. In most cases, it might be a date time field. Happy to help via email if you can't share the data here. If you can send through your working code and an example dataset, I can see where the error might be coming from. My email is vinay.udyawer@gmail.com

[joleehaz]

@vinayudyawer kindly reviewed my data, and it seems that there are not enough detections to estimate activity spaces. Incorporating more data is likely to fix the issue.

[Ryantheshark84]

@joleehaz @vinayudyawer , hi guys. I never got this working but when i reverted back to previous VTrack release it worked fine and i could estimate activity space. I uninstalled VTrack and then installed the version that wasnt the latest. On a side note, a colleague of mine has since got the HR_Summary working with the original dataset which would assume that there sufficient detections all along. Again, i tried to find the source of my issue with a big focus on date format but still no joy.