[R-sig-Geo] tooltips or annotation

[Roger Bivand]

On Tue, 16 Jun 2015, Erich Subscriptions wrote:

> I just tried the same test on Ubuntu with all the latest packages and 
> had the same problem.
>
> writeOGR does not work for GeoJSON

Yes it does, just read the driver page on OGR/GDAL:

http://www.gdal.org/drv_geojson.html

For GDAL 2.0.0RC2:

writeOGR(cities, paste(td, ".geojson", sep="/"), "OGRGeoJSON",
   driver="GeoJSON")
writeOGR(cities, paste(td, "cities.geojson", sep="/"), "OGRGeoJSON",
   driver="GeoJSON")
writeOGR(cities, paste(td, "cities.geojson", sep="/"), "cities",
   driver="GeoJSON")

all work (the file name extension in the dsn= argument matters); note 
that only:

writeOGR(cities, paste(td, ".geojson", sep="/"), "OGRGeoJSON",
   driver="GeoJSON")

works in GDAL 1.11.2.

So until you have GDAL 2, the file name must be ".geojson" (nothing before 
the dot), and probably the layer name must be "OGRGeoJSON".

Roger

>
> cities <- readOGR(system.file("vectors", package = "rgdal")[1], "cities")
> is.na(cities$POPULATION) <- cities$POPULATION == -99
> summary(cities$POPULATION)
> td <- "."
> writeOGR(cities, td, "cities", driver="ESRI Shapefile") # this works
> writeOGR(cities, td, "cities", driver="GeoJSON") # this fails
>
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-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
e-mail: Roger.Bivand at nhh.no