Celestia Forums

Does anybody know some (free) tools to transform different mapping coordinates (Lambert, Right-Up-Values, ...) into latitude/longitude values?

maxim

I did a Google for coordinate conversion tools. I found quite a few, but none of them were free.

Sorry.

It depends on exactly what you're trying to do.

One set of free geographic tools was at http://gmt.soest.hawaii.edu/ but the Web server is down right now.

You might try the list of packages at http://www.digitalgrove.net/Toolbox.htm
For example, it mentions that
TatukGIS® offers a free Datums & Projections Coordinate Calculator™. That may do what you want.

selden wrote:It depends on exactly what you're trying to do.

The task is quite simple. There are several locations I want to put into a location file. Their coordinates are given in one of the three dozen national or international coordinate systems, with all having their own meridians and origins.

I want to put these coordinates as input into a tool which returns the according long/lat as result.

As far as I've looked throught the existing tools, they don't give a dime on those simple tasks. They may be doing this on the fly with existing map data, but there seems to be no way of just giving/returning a simple coordinate pair. Maybe this is burried somewhere deep in those tools, but I havent been able to find it yet.

So any tip or hint where to search would be helpfull.


maxim

I don't understand what form your original coordinates are in.
If they are simply latitudes and longitudes using different standard ellipsoids and national datums, the difference between the systems is so small it's unlikely to be noticeable in Celestia.
However, if your data have grid references according to various national mapping standards and/or the UTM system, CoordTrans might be useful to you.

Grant

granthutchison wrote:...if your data have grid references according to various national mapping standards...

That's exactly what they are. So 'CoordTrans' would be the right thing - if only it was not limited to a 7-day trial.

maxim

maxim wrote:So 'CoordTrans' would be the right thing - if only it was not limited to a 7-day trial.

This may be a mad thought, but have you considered paying for it?

Grant

This perl module might be interesting to you, it's free, open and of course scriptable.
Geo::Coordinates::UTM

granthutchison wrote:...have you considered paying for it

That would be a good idea if I'd plan to use it regularily.
But I don't have a GPS, and I don't work with Maps. It's only a handfull of coordinates to translate. There was a time when I've always bought those software that I was planning to use. But that let to quite a bulk of it laying around on my harddisk and never be used again.

Christophe wrote:This perl module might be interesting to you, it's free, open and of course scriptable

Nice one. But my main problem currently are Lambert-Coordinates.

thanks for your help so far,

maxim

maxim wrote:It's only a handfull of coordinates to translate.

In that case send them to me. I own a copy of CoordTrans and I'll run them through for you.

Grant

Very nice! Thank you Grant!
I will collect them and send it to you next week.

maxim

You might try Corpscon by the US Army Corps of Engineers. It is available for free at http://crunch.tec.army.mil/software/cor ... pscon.html and a standard of sorts, although not known for its user-friendliness. I'm not familiar with Lambert coordinates and I don't know if Corpscon is either. Good luck!

I've found a free one: http://www.tatukgis.com/products/Calculator/Calculator.aspx

thank you all again,

maxim

PS: Found that selden did mention that already. I've just been too dumb to look.