auto rdf = ROOT::RDF::FromSqlite("http://root.cern/files/root_download_stats.sqlite", "SELECT * FROM accesslog;");

auto f = TFile::Open("http://root.cern/files/WM.root");
auto worldMap = f->Get<TH2Poly>("WMUSA");

auto fillIPLocation = [&worldMap] ( const std::string &sLongitude, const std::string &sLatitude ) {
   if (!( sLongitude == "" ) && !( sLatitude == "" )) {
      auto latitude = std::stof(sLatitude);
      auto longitude = std::stof(sLongitude);
      worldMap->Fill(longitude, latitude);
   }
};

rdf.Foreach( fillIPLocation, { "IPLongitude", "IPLatitude" } );

auto worldMapCanvas = new TCanvas();
worldMapCanvas->SetLogz();
worldMap->SetTitle("ROOT Downloads per Location (GitHub excluded);Longitude;Latitude");
worldMap->DrawClone("colz");

%jsroot on
gROOT->GetListOfCanvases()->Draw()