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Looking for a radius map

Leapy
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Looking for a radius map

I'm looking for a radius map similar to this one at https://radiusmap.traveltime.com/

In the picture, I'm looking at a radius of 40miles from Portsmouth Thumbs_Up

However, I want to look at a radius of 26,000 km from London Smiley so, any suggestions?

Screenshot 2021-05-10 1.09.08 AM.png

21 REPLIES 21
RobPN
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Re: Looking for a radius map


@Leapy wrote:

 

However, I want to look at a radius of 26,000 km from London Smiley so, any suggestions?


@Leapy 

This any good?  Wink

https://radiusmap.traveltime.com/?lat=51.509865&lng=-0.118092&dist=km&radius=26000&place=London

Map.PNG

shutter
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Re: Looking for a radius map

Not a radius map as such.... but may be useful..

 

http://www.dxatlas.com/DxAtlas/

 

after install..... zooooom in on your home location (QTH) . 

Go to MAP > Change home location

 put mouse cursor  ( + )  cross hairs on your chosen location... left click.. 

Go to Tools > Settings   > General   set the Distance Units

 then  Bearing/Distance Grid    select From home QTH

You can now use the "Dividers" in the top right menu bar  to find the distance from your home location.

Information about distance... lat and long ... time...  etc.... are in the bottom left corner menu of the map.

 

Leapy
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Re: Looking for a radius map

@RobPN that is interesting but when I ask google the distance from London to New Zealand it says 18,764 km and I want a 26,000km radius (52,000km diameter)

@shutter I will look into that but will have to get my Windows device out of the cobwebs and mothballs first Smiley

Screenshot 2021-05-10 11.22.57 AM.png

shutter
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Re: Looking for a radius map

@Leapy  If you are running linux... DXatlas will install with WINE  !  ( the software,.... not the liquid stuff ! ) .

DXAtlas shows the distance from Portsmouth to Wellington... as 18,850 Km ( approx)  on the "short path" and 21 120 Km on the "long path".

 

Leapy
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Re: Looking for a radius map

@shutter I'm mainly Chromebook and Andriod 10, so I'm a bit limited on running software, without the ability to run a DOS.

I was hoping to find a simple, idiotproof online option Roll_eyes, that could just tell me (or show me) x distance from London.

198kHz
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Re: Looking for a radius map


@Leapy wrote:

However, I want to look at a radius of 26,000 km from London Smiley so, any suggestions?


The diameter of Earth is only 12,742 km.

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RobPN
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Re: Looking for a radius map

@Leapy 

This distance calculator gives 18777.26 km for London to New Zealand, but I guess it uses a different NZ city for its calculation.  Wink

https://www.distance.to/London,Greater-London,England,GBR/New-Zealand

 

Edit:  I just noticed London is now in the south of France!

 

Lon-NZ.PNG

198kHz
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Re: Looking for a radius map

@Leapy 

How can you have a radius of 26,000 km when the distance between any point on Earth and its antipode is about 19,130 km?

Eg London and its antipode in Waitingi in the Chatham Islands:

Image2.jpg

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Leapy
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Re: Looking for a radius map

@RobPN Didn't you get the memo about moving London to France Funny

@198kHz Yes you make some very good points.Thumbs_Up I'm not suggesting a flat-earth is needed for the calculation, I just want to know, what and where is 26,000 km from London?🤔

198kHz
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Re: Looking for a radius map


@Leapy wrote:

@198kHz Yes you make some very good points.Thumbs_Up I'm not suggesting a flat-earth is needed for the calculation, I just want to know, what and where is 26,000 km from London?🤔


I'm thinking there must be a basic misconception somewhere on your part, Leapy.

Without invoking a flat earth, we know that the furthest you can travel on Earth on a direct path away from where you started - the 'great circle' distance - is from any point to its antipode on the opposite side of the globe.

Since that distance is about 19,130 km, nowhere on the planet can be 26,000 km away.

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Leapy
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Re: Looking for a radius map


@198kHz wrote:

@Leapy wrote:

@198kHz Yes you make some very good points.Thumbs_Up I'm not suggesting a flat-earth is needed for the calculation, I just want to know, what and where is 26,000 km from London?🤔


I'm thinking there must be a basic misconception somewhere ....

Since that distance is about 19,130 km, nowhere on the planet can be 26,000 km away.


So... if as they say, the circumference of the Earth 40,070 km, where would 26,00 km from London be (in any direction, be that clockwise or anti-clockwise)🤔

198kHz
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Re: Looking for a radius map

@Leapy 

OK, let's stick with nice round figures.

Circumference = 40,000 km.

You start from London, and go round the globe to the Chapman Islands (London's antipode). That's half a circumference ie 20,000 km.

If you travel any further, in any direction, you will be getting closer to London. 20,000 km is the furthest apart any two points on the Earth can possibly be.

Or as Oasis said - half a world away.

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198kHz
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Re: Looking for a radius map

A further thought: drawing circles on 'ordinary' maps only works on relatively small areas, where the curvature of the Earth has only a negligible effect. I'm thinking it would have to be ellipses?

To use circles you'd have to use some other map projection rather than the usual Mercator method.

Or of course a globe.

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Leapy
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Re: Looking for a radius map

@198kHz Yes I agree, if we say it's 40,000km from London to London over the poles,  it does need a shape over London that is getting smaller until you get back to where you started from (London).

So there must be a program and an algorithm that someone has written Roll_eyes

I'm currently thinking that 26,000 km linear going north from London and over the artic and around the back, would end up around the edge of Antarctica below and to the left of Cape Town, some 14,000km from London. Thumbs_Up