Error when one or both datasets has no trees #1
Description
I am running "match_trees" on the large tree plot separately from the small tree plot. In some cases, there are no trees (either field measured or MLS detected) on the small tree plot. This causes an error in match_trees.
I'm attaching the field measured trees (inventory.csv) and the MLS detected trees (measure.csv).
The last line of the following code generated the error.
inventory_STP <- standardize(inventory[inventory$Plotsize=="Small",], "Field_Xpj", "Field_Ypj", "Ht", zunits = "m", crs = 2959, idname = "Tree")
measure_STP <- standardize(measure[measure$Plotsize=="Small",], "X", "Y", "Ht", zunits = "m", crs = 2959, idname = "treeID")
center <- c(as.numeric(inventory$Easting[1]), as.numeric(inventory$Northing[1]))
smallmap <- make_mapmatching(inventory_STP, measure_STP, center = center, radius = 4, buffer = 0.5)
match_trees(smallmap, lsap_matching,dxymax = 2, dzmax = 40, zrel = 40, unmatch_cost = 1000 )
Thank you for any help on resolving the issue.