UTFGrid in Bing Maps (Part 1 - Introduction)

Part 1 - Introduction
Part 2 -Bing Maps Module

UTFGrid is a technology that provides the ability to have client-side interaction over raster map-tiles. Everything is very well explained in this page (which includes a working example), but the idea is simply to have an accompanying JSON file for each map-tile containing meta-information about that image. This info is also very fast to handle in client-side.

For instance, assuming this raster tile which contains Great-Britain:

The accompanying UTFGrid file will have something that looks like an ASCII-Art representation of the image (albeit a little bit stretched):

                                 !!!! !! !!!!!!!!!!!!!!!!!!!          
                                 !!!  !!! !!!!!!!!!!!!!!!!!!!         
                                  !  !!!!! !!!!!!!!!!!!!!!!!!!        
                                     !! !! !!!!!!!!!!!!!!!!!!!        
                            ##       !!    !!!!!!!!!!!!!!!!!!!        
                          #####  !!! !    !!!!!!!!!!!!!!!!!!!!        
                       ########!!!!!      !!!!!!!!!!!!!!!!!!!!        
                      #######!!!!!!!!    !!!!!!!!!!!!!!!!!!!!!!       
                     #######!!!!!!!!!    !!!!!!!!!!!!!!!!!!!!!!       
                      ######!!!!!!!!!!   !!!!!!!!! !!!!!!!!!!!!       
                    ########!!!!!!!!!!   !! !!!!  !!!!!!!!!!!!!!      
                    ######!!!!!!!!!!!!!   !  !    !!!!!!!!!!!!!!      
                      ####!!!!!!!!!!!!!!          !!!!!!!!!!!!!!!!!   
                      ##!!!!!!!!!!!!!!!!          !!!!!!!!!!!!!!!!!!  
              #  #   ####!!!!!#!!!!!!!!!    $$    !!!!!!!!!!!!!!!!!!  
            ##############!!!###!!!!!!!    $$$     !!!!!!!!!!!!!!!!!! 
            ###############!!####!!!!      $$$      !!!!!!!!!!!!!!!!!!
            ########################!      $$       !!!!!!!!!!!!!!!!!!
            ###################### #                 !!!!!!!!!!!!!!!!!
              #####################                  !!!!!!!!!!!!!!!!!
              #####################                  !!!!!!!!!!!!!!!!!
             #######################                 !!!!!!!!!!!!!!!!!
            ########################                !!!!!!!!!!!!!!!!!!
            ########################        !!      !!!!!!!!!!!!!!!!!!
              ######################       !!!!!!!!!!!!!!!!!!!!!!!!!!!
               ### #################        !!!!!!!!!!!!!!!!!!!!!!!!!!
              ## ###################         !!!!!!!!!!!!!!!!!!!!!!!!!
                #####################        !!!!!!!!!!!!!!!!!!!!!!!!!
                ####################       !!!!!!!!!!!!!!!!!!!!!!!!!!!
                ####################       !! !!!!!!!!!!!!!!!!!!!!!!!!
               #####################           !!!!!!!!!!!!!!!!!!!!!!!
             ######################            !!!!!!!!!!!!!!!!!!!!!!!
              #####################            !!!!!!!!!!!!!!!!!!!!!!!
              #####################            !!!!!!!!!!!!!!!!!!!!!!!
           ########################           !!!!!!!!!!!!!!!!!!!!!!!!
          ######################           !!!!!!!!!!!!!!!!!!!!!!!!!!!
            ################             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           ################             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           ##############                !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
            ###########                 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
            ##########                   !!   !!!!!!!!!!!!!!!!!!!!!!!!
              #####                              !!!! !!!!!!!!!!!!!!!!
                                                  !!!!!!!!!!!!!!!!!!!!
                                                !!   !!!!!!!!!!!!!!!!!
                                           !  !!!!!!!!!!!!!!!!!!!!!!!!
                                            ! !!!!!!!!!!!!!!!!!!!!!!!!
                                            !!!!!!!!!!!!!!!!!!!!!!!!!!
                                            !!!!!!!!!!!!!!!!!!!!!!!!!!
                                           !!!!!!!!!!!!!!!!!!!!!!!    
                                          !!!!!!!!!!   !!!!!  !!      
                                         !!!!!!!!!!     !             
                                         !!!!!!!!!!                   
                                       !!!!!   !!!                    
                                      !!!!!                           
                                      ! !!                            
                                  !     !                             
                                                                      
                                                         % && &&      
                                                            &&&&      
                                                       %%  &&&&&      
                                                            &&&&&&&&& 
                                                         ''  &&&&&&&&&
                                                          '  &&&&&&&&&
                                                             &&&&&&&&&

The file also contains a dictionary which maps these characters to the items they represent. Thus, in this particular case the following mappings exist:

• ! maps to United Kingdom
• # to the Republic of Ireland.
• $ to Isle of Man
• % to Guernsey (I actually have a colleague that lives there)
• ' to Jersey
• & to France

Last, but not least, the file also includes a dictionary with some meta-info for those "objects". For instance, as we're talking about countries it could include stuff like "name", "population", "area", "average earnings", etc.

Unfortunately there's no support for UTFGrid in Bing Maps, hence the reason for me writing this particular blog post.

Dynamically creating hexagons from real-world data (Part 3 - Data-Services)

Part 1 - Roads
Part 2 - Railroads and Forests
Part 3 - Data-Services

In this iteration of my experiment I've add a services layer that is able to fetch real world-info in GeoJSON format, instead of having it hard-coded as on the previous post.

Also, I've added a small degree of interaction on the hexagon board creation, as the user is now able to choose where the board will be created. Nothing too fancy though.

As a finishing touch I've also improved the overall appearance of the hexagons. The following image shows the end-result.