Adding A Linestring By St_read In Shiny/Leaflet


Answer :

Your test data is a dead link now, but I had a similar issue trying to plot sf linestrings and polygons in leaflet. The full error was 

Error in if (length(nms) != n || any(nms == "")) stop("'options' must be a fully named list, or have no names (NULL)") :  missing value where TRUE/FALSE needed

I was able to successfully plot my geometries by dropping the Z dimension from the line and polygon with st_zm. Here is an example:

library(sf) library(leaflet)  # create sf linestring with XYZM dimensions  badLine <- st_sfc(st_linestring(matrix(1:32, 8)), st_linestring(matrix(1:8, 2)))  # check metadata for badLine > head(badLine)  Geometry set for 2 features      geometry type:  LINESTRING     dimension:      XYZM     bbox:           xmin: 1 ymin: 3 xmax: 8 ymax: 16     epsg (SRID):    NA     proj4string:    NA     LINESTRING ZM (1 9 17 25, 2 10 18 26, 3 11 19 2...     LINESTRING ZM (1 3 5 7, 2 4 6 8)  # attempt map; will fail > leaflet() %>% +   addTiles() %>% +   addPolygons(data = badLine)  Error in if (length(nms) != n || any(nms == "")) stop("'options' must be a fully named list, or have no names (NULL)") :    missing value where TRUE/FALSE needed  # try again!  # drop Z and M dimensions from badLine goodLine <- st_zm(badLine, drop = T, what = "ZM")  # map; will plot successfully! leaflet() %>%   addTiles() %>%   addPolygons(data = goodLine)

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