COVID-19 status by country

NEW FEATURE: "Distance Column added"

So it is now possible to select a country, and the flow will then calculate the distance for all countries to the selected country based on the latitude/longitude formulas described at https://www.movable-type.co.uk/scripts/latlong.html
This makes it possible to sort the list based on proximity to a selected country.

The flow:

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8px;\n}\n\ntr:nth-child(even) {\n  background-color: #dddddd;\n}\n</style>\n</head>\n<body>\n<table>\n    <tr>\n        <th>column</th>\n        <th>field</th>\n        <th>description</th>\n    </tr>\n    <tr>\n        <td>1</td>\n        <td>location</td>\n        <td>country / state</td>\n    </tr>\n    <tr>\n        <td>2</td>\n        <td>distance</td>\n        <td>distance in km from the country you have selected in the dropdown menu.<br>\n            -1 if no country is selected.\n        </td>\n    </tr>\n    <tr>\n        <td>3</td>\n        <td>cases/day/million</td>\n        <td>average number of confirmed cases per day (over the last 7 days) per million persons.<br>\n            we have taken an average over the last 7 days to filter out any weekend effects.\n        </td>\n    </tr>\n    <tr>\n        <td>4</td>\n        <td>RN (Repr. Nr)</td>\n        <td>Reproduction number which is defined as <br><i>(conf_cases_last_week / conf_cases_week_before)</i><br>\n            where <i>conf_cases_last_week</i> is the total number of new confirmed cases registered last week.\n            A week is chosen to filter out any weekend effects.<br>\n            A RN of 9999 indicates that previous week no cases were reported while this week at least one case has been reported.\n        </td>\n    </tr>\n    <tr>\n        <td>5</td>\n        <td>RN (-1 day)</td>\n        <td>same as previous column but then calculated for the previous day.  \n            So tomorrow this column shows the same value you can see today in previous column.\n        </td>\n    </tr>\n    <tr>\n        <td>6</td>\n        <td>RN (-1week)</td>\n        <td>same as 3rd column but then calculated for the previous week.  \n            So a week later this column will show the same value as you can see today in 3rd column.\n        </td>\n    </tr>\n    <tr>\n        <td>7</td>\n        <td>RN (-2week)</td>\n        <td>same as 3rd column but then calculated for 2 weeks ago.  \n            So 2 weeks later this column will show the same value as you can see today in 3rd column.\n        </td>\n    </tr>\n    <tr>\n        <td>8</td>\n        <td>RN (-3week)</td>\n        <td>same as 3rd column but then calculated for 3 weeks ago.  \n        </td>\n    </tr>\n    <tr>\n        <td>9</td>\n        <td>tot. cases/million</td>\n        <td>total confirmed cases (at date retrieved) per million.  So this includes all confirmed cases.\n        </td>\n    </tr>\n    <tr>\n        <td>10</td>\n        <td>popul. [million]</td>\n        <td>total country population expressed in million.\n        </td>\n    </tr>\n    <tr>\n        <td>11</td>\n        <td>tot. cases</td>\n        <td>total reported confirmed cases.\n        </td>\n    </tr>\n</table>\n</body>\n","output":"str","x":260,"y":700,"wires":[["4a582d99.bd4984"]]},{"id":"b58129cd.f46a38","type":"change","z":"3739886a.1825b8","name":"html with background color","rules":[{"t":"set","p":"payload","pt":"msg","to":"( /* 3 color gradient green (0,255,0) - yellow (255, 255, 0) - red (255,0,0) \t     note that class tag is added as a hack to assure that sorting is workign properly\t   */\t  $rep_nr_with_style_fn := function($rep_nr){ \t       \"<div class='J\" & $substring($string($rep_nr/1000),2) &\t       \"' style='background-color: rgb(\" &\t       ( $rep_nr <  0.6 ? \"0,255,0\"\t         : $rep_nr <= 1.0 ? (\t             $fraction255 := (($rep_nr - 0.6)*255/0.4)~>$round(0);\t             $fraction255 & \",\" & \t             ((255 - ( $fraction255*(255-255)/255))~>$round(0)) & \",0\";\t         )\t         : $rep_nr <= 2.0 ? (\t             $fraction255 := (($rep_nr - 1)*255)~>$round(0);\t             \"255,\" & (255 - $fraction255)  & \",0\";\t         )\t         : \"255,0,0\") & \t         \")'>\" & $rep_nr & \"</div>\"         \t  };\t  payload ~> | $ | {\t     \"html_reproduction_number\"          :  $rep_nr_with_style_fn(reproduction_number),\t     \"html_reproduction_number_1day_ago\" :  $rep_nr_with_style_fn(reproduction_number_1day_ago),\t     \"html_reproduction_number_1week_ago\" :  $rep_nr_with_style_fn(reproduction_number_1week_ago), \t     \"html_reproduction_number_2week_ago\" :  $rep_nr_with_style_fn(reproduction_number_2week_ago),\t     \"html_reproduction_number_3week_ago\" :  $rep_nr_with_style_fn(reproduction_number_3week_ago)\t  } |\t)","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":300,"y":400,"wires":[["e9092edc.7f8d3","4ccd263e.f616c8","94e3c9a.18b3d38"]]},{"id":"94e3c9a.18b3d38","type":"debug","z":"3739886a.1825b8","name":"with background color","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":600,"y":400,"wires":[]},{"id":"631625f5.c0ae7c","type":"ui_dropdown","z":"3739886a.1825b8","name":"","label":"country","tooltip":"","place":"Select option","group":"50d8c10e.e27b4","order":3,"width":0,"height":0,"passthru":false,"multiple":false,"options":[{"label":"","value":"","type":"str"}],"payload":"","topic":"","x":580,"y":280,"wires":[["b82fe468.2f9e68","e3654952.086598"]]},{"id":"b82fe468.2f9e68","type":"change","z":"3739886a.1825b8","name":"","rules":[{"t":"set","p":"country","pt":"flow","to":"{\t  \"name\" : payload,\t  \"latitude\" : $flowContext(\"ui_table\")[country_region = $$.payload].latitude,\t  \"longitude\" : $flowContext(\"ui_table\")[country_region = $$.payload].longitude\t}","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":760,"y":280,"wires":[["188cf083.a11a5f"]]},{"id":"188cf083.a11a5f","type":"change","z":"3739886a.1825b8","name":"msg.payload = flow.ui_table","rules":[{"t":"set","p":"payload","pt":"msg","to":"ui_table","tot":"flow"}],"action":"","property":"","from":"","to":"","reg":false,"x":940,"y":340,"wires":[["f4d0f6f8.2e6178"]]},{"id":"f4d0f6f8.2e6178","type":"split","z":"3739886a.1825b8","name":"","splt":"\\n","spltType":"str","arraySplt":1,"arraySpltType":"len","stream":false,"addname":"","x":890,"y":400,"wires":[["eb8e08a0.6168a8"]]},{"id":"eb8e08a0.6168a8","type":"function","z":"3739886a.1825b8","name":"calculate distance","func":"var lat1 = flow.get(\"country\").latitude;\nvar lon1 = flow.get(\"country\").longitude;\nvar lat2 = msg.payload.latitude;\nvar lon2 = msg.payload.longitude;\n\n/* calculate distance as specified in \n   https://www.movable-type.co.uk/scripts/latlong.html */\n   \nconst R = 6371e3; // metres\nconst φ1 = lat1 * Math.PI/180; // φ, λ in radians\nconst φ2 = lat2 * Math.PI/180;\nconst Δφ = (lat2-lat1) * Math.PI/180;\nconst Δλ = (lon2-lon1) * Math.PI/180;\n\nconst a = Math.sin(Δφ/2) * Math.sin(Δφ/2) +\n          Math.cos(φ1) * Math.cos(φ2) *\n          Math.sin(Δλ/2) * Math.sin(Δλ/2);\nconst c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));\n\nconst d = R * c; // in metres\n\nmsg.payload.distance = Math.round(d / 1000) ;\n\nreturn msg;","outputs":1,"noerr":0,"x":930,"y":440,"wires":[["e9fe4c33.8355","61e0af74.21009"]]},{"id":"e9fe4c33.8355","type":"join","z":"3739886a.1825b8","name":"","mode":"auto","build":"string","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":"false","timeout":"","count":"","reduceRight":false,"x":890,"y":480,"wires":[["e9092edc.7f8d3"]]},{"id":"61e0af74.21009","type":"debug","z":"3739886a.1825b8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":1150,"y":440,"wires":[]}]

Here below a chart where "United Kingdom" is selected and we have sorted according increasing distance: