topic Re: Plot a map location using Maidenhead Grid Square in Dashboards & Visualizations

Plot a map location using Maidenhead Grid Square

kashifqau — Mon, 08 Jun 2020 21:25:53 GMT

Hello,

I am working with Radio data, which contains location in Maidenhead Grid Square format rather then latitude and longitude.

I want to know about how can I plot maps by using Maidenhead Grid Square

How can I convert Maidenhead Grid Square to latitude and longitude using formula? (If I make the transformation into latitude and longitude that can be plotted further using Splunk)

Muhammad Kashhif

Re: Plot a map location using Maidenhead Grid Square

sandyIscream — Wed, 13 Dec 2017 10:49:31 GMT

I am guessing you want the formula to conver Maidenhead Grid square to latitude and longitude. if yes then you can go to the below link and check for it.

https://ham.stackexchange.com/questions/221/how-can-one-convert-from-lat-long-to-grid-square

I believe this will help you convert them to latitude and longitude. Then save this formula as macro in your search head, so you don't need to write it again n again for future purpose. You just have to call the macro.

Re: Plot a map location using Maidenhead Grid Square

kashifqau — Wed, 13 Dec 2017 10:53:28 GMT

Thank you for your reply Sandylscream,
I am looking for an opposite formula of what you posted. The posted formula gets latitude/longitude as input and converts it into Maidenhead where I am looking for one to input Maidenhead and provides me with latitude/longitude
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Re: Plot a map location using Maidenhead Grid Square

kashifqau — Sun, 17 Dec 2017 07:53:28 GMT

I found a python library with name "pyhamtools", from where I extracted the formula for the conversion of Maidenhead Grid Square to latitude longitude and have implemented in Splunk as below

index="wsprindex" sourcetype="wsprsourcetype" | eval first=substr(grid,1,1) | eval second=substr(grid,2,1) | eval third=substr(grid,3,1) | eval fourth=substr(grid,4,1) | lookup asciitable.csv symbol As first OUTPUTNEW code as firstcode |eval valueA = "A" | eval value0 = "0"| lookup asciitable.csv symbol As second OUTPUTNEW code as secondcode | lookup asciitable.csv symbol As third OUTPUTNEW code as thirdcode | lookup asciitable.csv symbol As fourth OUTPUTNEW code as fourthcode | lookup asciitable.csv symbol As valueA OUTPUTNEW code as codeofA | lookup asciitable.csv symbol As value0 OUTPUTNEW code as codeof0 | eval longitude = ((((firstcode - codeofA) * 20) - 180) + ((thirdcode - codeof0) * 2)) | eval latitude = ((((secondcode - codeofA) * 10) - 90) + (fourthcode -codeof0)) | geostats longfield=longitude, latfield=latitude count by grid

(grid is the field, which contains Maidenhead Grid Square values and asciitable.csv is a lookup table which contains ascii values of alphabets and letters)

Re: Plot a map location using Maidenhead Grid Square

niketn — Sun, 17 Dec 2017 08:27:30 GMT

@kashifqau, please accept your own answer to mark this question as answered!

Re: Plot a map location using Maidenhead Grid Square

crofrog — Sun, 05 Apr 2020 16:59:00 GMT

What is ascitable.csv?

Re: Plot a map location using Maidenhead Grid Square

to4kawa — Sun, 05 Apr 2020 20:29:40 GMT

{
            locator = locator.Trim().ToUpper();
            if (Regex.IsMatch(locator, "^[A-R]{2}[0-9]{2}$"))
            {
                LatLng ll = new LatLng();
                ll.Long = (locator[0] - 'A') * 20 + (locator[2] - '0' + 0.5) * 2 - 180;
                ll.Lat = (locator[1] - 'A') * 10 + (locator[3] - '0' + 0.5) - 90;
                return ll;
            }
            else if (Regex.IsMatch(locator, "^[A-R]{2}[0-9]{2}[A-X]{2}$"))
            {
                LatLng ll = new LatLng();
                ll.Long = (locator[0] - 'A') * 20 + (locator[2] - '0') * 2 + (locator[4] - 'A' + 0.5) / 12 - 180;
                ll.Lat = (locator[1] - 'A') * 10 + (locator[3] - '0') + (locator[5] - 'A' + 0.5) / 24 - 90;
                return ll;
            }
            else if (Regex.IsMatch(locator, "^[A-R]{2}[0-9]{2}[A-X]{2}[0-9]{2}$"))
            {
                LatLng ll = new LatLng();
                ll.Long = (locator[0] - 'A') * 20 + (locator[2] - '0') * 2 + (locator[4] - 'A' + 0.0) / 12 + (locator[6] - '0' + 0.5) / 120 - 180;
                ll.Lat = (locator[1] - 'A') * 10 + (locator[3] - '0') + (locator[5] - 'A' + 0.0) / 24 + (locator[7] - '0' + 0.5) / 240 - 90;
                return ll;
            }
            else if (Regex.IsMatch(locator, "^[A-R]{2}[0-9]{2}[A-X]{2}[0-9]{2}[A-X]{2}$"))
            {
                LatLng ll = new LatLng();
                ll.Long = (locator[0] - 'A') * 20 + (locator[2] - '0') * 2 + (locator[4] - 'A' + 0.0) / 12 + (locator[6] - '0' + 0.0) / 120 + (locator[8] - 'A' + 0.5) / 120 / 24 - 180;
                ll.Lat = (locator[1] - 'A') * 10 + (locator[3] - '0') + (locator[5] - 'A' + 0.0) / 24 + (locator[7] - '0' + 0.0) / 240 + (locator[9] - 'A' + 0.5) / 240 / 24 - 90;
                return ll;

https://unclassified.software/files/source/MaidenheadLocator.cs

You can calculate