Fix namespace imports.

DESCRIPTION

@@ -29,7 +29,7 @@ LazyData: true
 Imports: classInt, deldir, geojsonio, geojsonlint, geonetwork, igraph,
         methods, maps, maptools, plyr, raster, rasterVis, RColorBrewer,
         rgdal, rgeos, rhandsontable, shiny, shinydashboard, shinyFiles,
-        sp, stringr, utils
+        sf, sp, stringr, utils
 Suggests: covr, devtools, knitr, lintr, mapview, rmarkdown, roxygen2,
         testthat
 RoxygenNote: 7.1.0

NAMESPACE

@@ -40,10 +40,15 @@ importFrom(igraph,edge.attributes)
 importFrom(igraph,edge_attr_names)
 importFrom(igraph,gorder)
 importFrom(igraph,graph_from_data_frame)
+importFrom(igraph,induced_subgraph)
 importFrom(igraph,is.weighted)
 importFrom(igraph,vertex.attributes)
+importFrom(raster,extract)
 importFrom(raster,intersect)
 importFrom(rgeos,gUnaryUnion)
+importFrom(sf,as_Spatial)
+importFrom(sf,st_crs)
+importFrom(sf,st_transform)
 importFrom(stats,setNames)
 importFrom(utils,count.fields)
 importFrom(utils,read.csv)