OT: Map reference conversions

I won't pretend to be anything like an expert on all the different map
reference protocols. Is there a good site anywhere,

Also any tools for converting say from Longditudte etc to OS references.

Lee D

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in article [email protected], Lee_D at
[email protected] wrote on 16/9/04 16:16:

> I won't pretend to be anything like an expert on all the different map
> reference protocols. Is there a good site anywhere,
>
> Also any tools for converting say from Longditudte etc to OS references.
>
> Lee D
I have just been messing about with my Garmin Etrex gps system and I can put
in lat and long refrences and ,by switching the grid get OS refs out of it,
if that is of any use.



-
Rory Manton
-
Oh gods , why me?

"Rory Manton" <[email protected]> wrote in message
news:BD6FA438.2945A%[email protected]...

> I have just been messing about with my Garmin Etrex gps system and I can
> put
> in lat and long refrences and ,by switching the grid get OS refs out of
> it,
> if that is of any use.
>

Thats the idea but I was hoping to use something of an Internet Link IYSWIM.

Lee D

On Thu, 16 Sep 2004 19:19:23 GMT, "Lee_D" <[email protected]> wrote:

>"Rory Manton" <[email protected]> wrote in message
>news:BD6FA438.2945A%[email protected]...
>
>> I have just been messing about with my Garmin Etrex gps system and I can
>> put
>> in lat and long refrences and ,by switching the grid get OS refs out of
>> it,
>> if that is of any use.
>>
>
>Thats the idea but I was hoping to use something of an Internet Link IYSWIM.
>
>Lee D
>

I might have some code (probably C++) that could do the conversion. It
might also be available in VB6. If interested, I'll have a look to
see what I have.

Microsoft's MapPoint product can also do the conversion.

If you're looking at doing the conversion yourself, there's the gotcha
that most GPS systems use the WGS 84 geoid for longitude/latitude,
whilst Ordnance Survey use Airy '36 (iirc) for the national grid.

(WGS 84 is a better global fit, whilst Airy is historical for the OS
and a better local fit for the UK).


Yes much of my day job is maps and GIS...


Richard Marsden
http://www.winwaed.com


Richard Marsden
Winwaed Software Technology
http://www.winwaed.com

"Winwaed Software Technology" <[email protected]> wrote in message
news:[email protected]...
> On Thu, 16 Sep 2004 19:19:23 GMT, "Lee_D" <[email protected]> wrote:
>
>>"Rory Manton" <[email protected]> wrote in message
>>news:BD6FA438.2945A%[email protected]...
>>
>>> I have just been messing about with my Garmin Etrex gps system and I can
>>> put
>>> in lat and long refrences and ,by switching the grid get OS refs out of
>>> it,
>>> if that is of any use.
>>>
>>
>>Thats the idea but I was hoping to use something of an Internet Link
>>IYSWIM.
>>
>>Lee D
>>
>
> I might have some code (probably C++) that could do the conversion. It
> might also be available in VB6. If interested, I'll have a look to
> see what I have.
>
> Microsoft's MapPoint product can also do the conversion.
>
> If you're looking at doing the conversion yourself, there's the gotcha
> that most GPS systems use the WGS 84 geoid for longitude/latitude,
> whilst Ordnance Survey use Airy '36 (iirc) for the national grid.
>
> (WGS 84 is a better global fit, whilst Airy is historical for the OS
> and a better local fit for the UK).
>
>
> Yes much of my day job is maps and GIS...
>
>
> Richard Marsden
> http://www.winwaed.com
>
>
> Richard Marsden
> Winwaed Software Technology
> http://www.winwaed.com

Go to http://files.seddonsden.me.uk and run NGR84, its easy to use.

Peter.


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> I won't pretend to be anything like an expert on all the different map
> reference protocols. Is there a good site anywhere,

Have you tried the Ordnance Survey site?
http://www.ordnancesurvey.co.uk
and more specifically:
http://www.gps.gov.uk/guidecontents.asp

> Also any tools for converting say from Longditude etc to OS references.

There's an on-line convertor here:
http://www.gps.gov.uk/convert.asp (but it looks like an IE-only page!)
Register here first:
http://www.gps.gov.uk/login.asp

If you want something for your own PC try here:
http://www.qgsl.com/software/gridiq.php
http://www.qgsl.com/software/download.php (Grid InQuest)
Registration required and there are likely to be some restrictions on
use for non-personal purposes. Link was found via the OS GPS site.

David