On Thursday, April 30, 2020 at 7:31:18 PM UTC-7, Martin Hauer wrote:
>
> I would like to convert Geo-coordinates with a click on a button in a
> Tiddler.
> The coordinates should be converted from i.e. N 47° 04.624' to 47.077067°
> and then a Google-Maps link should be created (<a href="
> http://maps.google.at/maps?q=47.077067+015.437033"; target="_blank">
> [img[in Google Maps anzeigen|GoogleMaps_Logo_36.gif]] </a>)
>
Field1 = N
> Field2 = 47
> Field3 = 04
> Field4 = 624
> Field5 = E
> Field6 = 015
> Field7 = 26
> Field8 = 222
>
The formula for converted from DMS (degrees,minutes,seconds) to DD (decimal
degrees) is: *DD = D + M/60 + S/3600*
Note that in your example, you are specifying degrees=47 and minutes=4.624
(using two fields to hold integer and decimal portions of the minutes
value).
Thus, for D=47, M=4.624, we calculate: *DD = 47 + 4.624/60 = 47 + 0.077067*
To get this value using TW Math Filter operators, we can write:
{{{ [{!!field2}] [{!!field3}divide[60]] [{!!field4}divide[1000]divide[60]]
+[sum[]multiply[1000000]round[]divide[1000000]] }}}
* get the value from field2
* get the value from field3 and then divide by 60
* get the value from field4 and then divide by 1000 to shift the decimal
point to the left and then divide by 60
* add these values
* then, to round to 6 decimal places, multiply by 1000000, round to the
nearest integer and then divide by 1000000
Thus, to get the latitude and longitude as variables, we would write:
<$vars latitude={{{ [{!!field2}] [{!!field3}divide[60]]
[{!!field4}divide[1000]divide[60]]
+[sum[]multiply[1000000]round[]divide[1000000]] }}}>
<$vars longitude={{{ [{!!field6}] [{!!field7}divide[60]]
[{!!field8}divide[1000]divide[60]]
+[sum[]multiply[1000000]round[]divide[1000000]] }}}>
and to construct the desired URL, we can use the title[] and addsuffix[]
filters, like this:
<$vars url={{{ [title[http://maps.google.at/maps?q=]addsuffix<latitude>
addsuffix[+]addsuffix<longitude>] }}}>
Then, we can display the link this way:
<a href=<<url>> target="_blank"> [img[in Google Maps
anzeigen|GoogleMaps_Logo_36.gif]] </a>
Putting it all together:
<$vars latitude={{{ [{!!field2}] [{!!field3}divide[60]]
[{!!field4}divide[1000]divide[60]]
+[sum[]multiply[1000000]round[]divide[1000000]] }}}>
<$vars longitude={{{ [{!!field6}] [{!!field7}divide[60]]
[{!!field8}divide[1000]divide[60]]
+[sum[]multiply[1000000]round[]divide[1000000]] }}}>
<$vars url={{{ [title[http://maps.google.at/maps?q=]addsuffix<latitude>
addsuffix[+]addsuffix<longitude>] }}}>
<a href=<<url>> target="_blank"> [img[in Google Maps
anzeigen|GoogleMaps_Logo_36.gif]] </a>
</$vars>
</$vars>
</$vars>
enjoy,
-e
Eric Shulman
TiddlyTools.com: "Small Tools for Big Ideas!" (tm)
InsideTiddlyWiki - http://TiddlyTools.com/InsideTW
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