r - Plotting polygons and lines of lat and lon on the map -


so have following colums in dataset:

 lat =c(10, 20-30, 40, 60-70)  lon=c(15, 35-45, 50-60, 70)  num=c(4,5,2,3) data= data.frame('dec_lat'=lat, 'dec_lon'=lon,'value' =num)

i have these lat/lon coordinates want plot on map. however, of them points, polygons , lines.

in addition, have 5 5 dehree grid on map, want fill squares based on number num column.

when lat , lon in form of point- easy do. not sure how fill in squares of grid line or polygon overlap.

i appriciate ideas on how that. using grid , map following example : http://www.iobis.org/manual/processing/

everything works points not sure how adjust polygons , lines 

#create quick world map world <- map_data("world")  #this creates quick , dirty world map - playing around themes, aesthetics, , device dimensions recommended!    worldmap <- ggplot(world, aes(x=long, y=lat)) +   geom_polygon(aes(group=group)) +   scale_y_continuous(breaks = (-2:2) * 30) +   scale_x_continuous(breaks = (-4:4) * 45) +   theme(panel.background = element_rect(fill = "steelblue")) + # "steelblue"   coord_equal() #it may preferable in these cases plot data on grid. here, create 5x5 degree global grid:     global_grid <- raster(nrows = 180/5, ncol = 360/5, xmn = -180, xmx = 180, ymn = -90, ymx = 90)  #get longitude , latitude:  allspp_obis <- data[!(is.na((data$dec_lat))) | !(is.na((data$dec_lon))) ,] lonlat_sp <- cbind(y = allspp_obis$dec_lat, x = allspp_obis$dec_lon)  #and sum these on grid:     gridded_occs <- rasterize(x = lonlat_sp, y = global_grid, fun = "count")  #now add occurrence points:   occ_map <- worldmap + geom_point(data = (data), aes(x = latlon$dec_lat, y = latlon$dec_lon),                                    colour = "darkorange", shape = 21, alpha = 2/3)  #to render these using ggplot, i’ve adapted code here. first, turn gridded data dataframe of points, , name variables sensibly:    obis.p <- data.frame(rastertopoints(gridded_occs)) names(obis.p) <- c("longitude", "latitude", "obis")  #then add these using geom_raster worldmap generated previously:     (worldmap + geom_raster(data = obis.p, aes(x = longitude, y = latitude, fill = obis)) +       scale_fill_gradient(low = "white", high = "darkorange")   )


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