diff --git a/BigData.m b/BigData.m
index ce81111..ea56d9e 100644
--- a/BigData.m
+++ b/BigData.m
@@ -1,9 +1,23 @@
-ncfile = 'o3_surface_20180701000000.nc';
+%The files required is in: o3_surface_20180701000000.nc
+%Install Map Viewer
+%Colorblind Reference: https://www.mathworks.com/matlabcentral/mlc-downloads/downloads/submissions/30161/versions/4/screenshot.png
 
-colorblind = 1;
-choose = 1;
+display()
+%close all
 
-if (choose == 1) 
+function display()
+    ncfile = 'o3_surface_20180701000000.nc'; %contains all the 24 hours ozone models - Given on moodle
+
+    clc;
+    colorblind = 1; %bool value
+    choose = 1; %bool value
+    
+    program_exit = 0;
+   
+    
+     while program_exit == 0
+    
+        if (choose == 1) %% if statement for the menu. Menu allows the user to choose which ozone model they would like to view whilst also assigning their choice to title.
             typechoosen = menu('Which model would you like to see?', 'Chimere', 'Emep', 'Ensemble', 'Eurad','Lotoseuros','Match','Mocage','Silam'); %% options that are shown in the menu.
             if typechoosen == 1
                 showtype = ('chimere_ozone');
@@ -35,62 +49,58 @@
 
         clc;
 
-ozone_end = ncread(ncfile, showtype);.
-        longitude = ncread(ncfile,'lon');
-        latitude = ncread(ncfile,'lat');
-        time = ncread(ncfile,'hour');
-        timel = length(time) ;
-        
+        ozone_end = ncread(ncfile, showtype); % reads one specific model from the combined file depending on the user choice in the menu above.
+
+        longitude = ncread(ncfile,'lon'); %% longitude variable
+        latitude = ncread(ncfile,'lat'); %% latitude variable
+        time = ncread(ncfile,'hour'); %% time variable 
+        timel = length(time) ; %% length of the time variable
+
         [X,Y] = meshgrid(longitude,latitude) ; 
-        figure('Name', titlechoice,'NumberTitle','off');
-        set(gcf, 'Position', get(0, 'Screensize'));
+        figure('Name', titlechoice,'NumberTitle','off'); %%formats the figure info shown
+        set(gcf, 'Position', get(0, 'Screensize')); %% fullscreen
         clf; 
 
-        for i = 1:timel
+        for i = 1:timel %% loop to run the graphics and menus according with the time lenght 
             clf; 
-            map = pcolor(X,Y,ozone_end(:,:,i)') ;
+            map = pcolor(X,Y,ozone_end(:,:,i)') ; %% set the data on the map.
             map.EdgeAlpha = 0;
             ylabel('Longitude')
             xlabel('Latitude')
-                    if (colorblind == 1) %Menu to choose the colorblindness option.
-                            info = menu('Color Accessibility Options', 'Default', 'Protanopia','Deuteranopia','Tritanopia','Monochromacy');
-                            if info == 1
-                                colormap default;
-                            elseif info == 2
-                                colormap winter; %%Protanopia colors.
-                            elseif info == 3
-                                colormap cool;   %%Deuteranopia colors.
-                            elseif info == 4
-                                colormap copper; %%Tritanopia colors.
-                            elseif info == 5
-                                colormap bone;   %%Greyscale
-                            end
-                            colorblind = 0;
-                        end
-
-                        clc;
-                        
-                        cities = shaperead('worldcities', 'UseGeoCoords', true); 
-                        geoshow(cities, 'Marker', 'O', 'Color', 'red')
+            if (colorblind == 1) %Menu to choose the colorblindness option.
+                info = menu('Color Accessibility Options', 'Default', 'Protanopia','Deuteranopia','Tritanopia','Monochromacy');
+                if info == 1
+                    colormap default;
+                elseif info == 2
+                    colormap winter; %%Protanopia colors.
+                elseif info == 3
+                    colormap cool;   %%Deuteranopia colors.
+                elseif info == 4
+                    colormap copper; %%Tritanopia colors.
+                elseif info == 5
+                    colormap bone;   %%Greyscale
+                end
+                colorblind = 0;
+            end
+            clc
+            cities = shaperead('worldcities', 'UseGeoCoords', true); %%shows cities 
+            geoshow(cities, 'Marker', 'O', 'Color', 'red')
 
-                        lakes = shaperead('worldlakes', 'UseGeoCoords', true); 
-                        geoshow(lakes, 'FaceColor', 'blue')
+            lakes = shaperead('worldlakes', 'UseGeoCoords', true); %%shows lakes 
+            geoshow(lakes, 'FaceColor', 'blue')
 
-                        rivers = shaperead('worldrivers', 'UseGeoCoords', true); 
-                        geoshow(rivers, 'Color', 'blue')
+            rivers = shaperead('worldrivers', 'UseGeoCoords', true); %%shows rivers
+            geoshow(rivers, 'Color', 'blue')
 
-                        choose = colorbar; 
-                        choose.Label.String = 'Ozone Levels';
-                        
-                        hold on;
-            Choose = load('coast'); 
-            plot(Choose.long,Choose.lat,'k') 
+            choose = colorbar; % Colorbar that shows the Ozone level 
+            choose.Label.String = 'Ozone Levels'; 
+            
+            hold on;
+            Choose = load('coast'); % loads the coast for the map.
+            plot(Choose.long,Choose.lat,'k') %plots the map 
             shading interp ; 
-            title(sprintf('Hour: %f',time(i)))
-            pause(0.01) 
+            title(sprintf('Hour: %f',time(i))) %% Show the hours above the map.
+            pause(0.01) %% Pause of 0.01 seconds but can change depends of the hardware.
         end
      end     
 end
-                      end
-                     end
-