| Author |
convert from GPS to local grid
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| sazykin@gmail.com 2006-08-18, 4:33 am |
| I need a help to convert GPS coordinates. I almost have no background
how to do this.... but was volunteered to write algorithm to convert
Lat Long from DGPS to the local grid X&Y.
I would appreciate any help how to do this.
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| David Lee 2006-08-18, 4:33 am |
| sazykin@gmail.com wrote...
>I need a help to convert GPS coordinates. I almost have no background
> how to do this.... but was volunteered to write algorithm to convert
> Lat Long from DGPS to the local grid X&Y.
> I would appreciate any help how to do this.
You should say where you are and which local grid/datum you want to convert
to. You may be lucky and find that what you need already exists. For
example in the UK we have free access to GridInquest, which converts between
geodesic and UK OS grid coords and can be embedded in user applications. If
your time is worth money then there is a comprehensive version of this
package available - Quest Geodesic Calculator - that may serve your needs
for 250 UK pounds. www.qgsl.com/software/ gps_geodesy_products
.php - you
would need to check that it includes your grid of course.
David
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| sazykin@gmail.com 2006-08-18, 4:33 am |
| The problem is I don't want to user any diff software I want to write
my own module that will convert for me.... based on my ellipsoid
(flattering and major axis) + grid parameters.
The one thing I want to know is which steps should I take to do this
conversion from lat/long to x/y......
David Lee wrote:
> sazykin@gmail.com wrote...
>
> You should say where you are and which local grid/datum you want to convert
> to. You may be lucky and find that what you need already exists. For
> example in the UK we have free access to GridInquest, which converts between
> geodesic and UK OS grid coords and can be embedded in user applications. If
> your time is worth money then there is a comprehensive version of this
> package available - Quest Geodesic Calculator - that may serve your needs
> for 250 UK pounds. www.qgsl.com/software/ gps_geodesy_products
.php - you
> would need to check that it includes your grid of course.
>
> David
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| David Lee 2006-08-18, 7:33 am |
| sazykin@gmail.com wrote in message
news:1155892782.600942.214760@i3g2000cwc.googlegroups.com...
> The problem is I don't want to user any diff software I want to write
> my own module that will convert for me.... based on my ellipsoid
> (flattering and major axis) + grid parameters.
>
> The one thing I want to know is which steps should I take to do this
> conversion from lat/long to x/y......
Look at the refs I posted in a reply to your posting on SGS-N for the
background. You can do it all yourself if you want the glory but it looks
like you can get at all the GeoTrans source code in Ansi C, MS Visual C/C++
and Java implementations. There are also compiled dlls so you can probably
simply incorporate the libraries in your own software - even if you don't
speak C++. I only downloaded the Windows executables so you'll have to have
a look at the developer version of the download to be sure what it can do
for you.
David
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| Bergzot 2006-08-19, 12:33 pm |
| On http://www.posc.org/Epicentre.2_2/D...sage/eu_cs.html
you can find all formulas that you need.
<sazykin@gmail.com> schreef in bericht
news:1155885179.309717.208980@m79g2000cwm.googlegroups.com...
>I need a help to convert GPS coordinates. I almost have no background
> how to do this.... but was volunteered to write algorithm to convert
> Lat Long from DGPS to the local grid X&Y.
> I would appreciate any help how to do this.
>
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