conversion of coordinates from wgs84 to gauss-boaga

[<<Niçk>>]

Hello, everyone. I would need help about converting coordinates from one reference system to another.

are in possession of data detected with a gps and returned in the form of lat and long (the files in my possession I have both colored them in excel for lat and long and plotted in cad). If you want to move to the gauss-boaga est system, would you know by chance to tell me some plans that can do this? I had tried the cconvert 1.2 light program but it has the problem that, just being the light version, I can't play a certain amount of data.

Attached I entered my starting file in txt format and zipped for the need. I hope you can help me.
Thank you.
Niche

 

[Tristan]

if you have dwg you could opt for autocad map 3d (free for students)

 

[<<Niçk>>]

Thank you Tristan for the prompt answer. I'll follow your advice. In the meantime that I'm looking for it, if I put a test file, could you give me a hand and change coordinates please?

 

[studio.avarino]

there is also to be paid attention to the datum: the gps, usually, refers to the wgs84, almost all of the Italian technical cartography use the gauss-boaga coordinates, but the datum is the ed50 and, of course, different datum lead to different coordinates, although using the same system of coordinates.
If, for example, you are interested in the matter for reasons related to seismic legislation, the question is not trivial: the tops of the reference grid published with the ntc2008 are referred to the ed50 and, consequently, the various programs that detect the coordinates of the site from googlemaps (wgs84) and then get the data of the reference earthquake with the grid ntc2008, if they do not make the conversion of the datum, they lead you to commit a systematic error linked precisely to the difference of the used datum.
I hope I haven't confused your ideas, I realize I haven't been very clear in the exhibition!

 

[Tristan]

If I put you a test file, could you give me a hand and change my coordinates, please?

Okay, but I can't do it before Monday. .

there is also to be paid attention to the datum: the gps, usually, refers to the wgs84, almost all of the Italian technical cartography use the gauss-boaga coordinates, but the datum is the ed50 and, of course, different datum lead to different coordinates, although using the same system of coordinates.

the real gb in reality is reported to roma40. It is also obvious that we are talking about different coordinates. gps reason for geocentric coordinates then transmuted into latlong (spherical); gb is a projected system (plan).

 

[studio.avarino]

the real gb in reality is reported to roma40. It is also obvious that we are talking about different coordinates. gps reason for geocentric coordinates then transmuted into latlong (spherical); gb is a projected system (plan)

Sorry ignorance, what is the gb?

Italian cartography with projection on ellipsoid roma 40 I do not believe that there is still, I confirm that almost everything is projected on ed50. I am not a specialist in this matter, but I think it is appropriate to remember that datum, system of coordinates and origin of the coordinates are different things: this is the meaning of my previous post, I can have cartography that have the same system of coordinates (e.g. gauss-boaga) but different ellipsoids of reference, this means that one same point will have different coordinates in the two maps, although the origin of the reference system is equal for both cartography!

 

[Tristan]

Sorry ignorance, what is the gb?

gb = gaus-boaga

Italian cartography with projection on ellipsoid roma 40 I do not believe that there is still, I confirm that almost everything is projected on ed50. I am not a specialist in this matter.. .

Don't say nonsense. . .

 

[<<Niçk>>]

@studio.avarino:
Actually, my problem should be much easier: I simply have to "transform" the positions detected with the gps (no legislation). through a freeware program I converted the single point; Too bad I have about 15,000 points.

Okay, but I can't do it before Monday. .

Yeah, no problem. Thank you Tristan. I have inserted the pictures of the points (initial and final) taken with the gps and the coordinates that they should have after conversion:

First point.jpg
last point.jpg

attached instead I entered the .dwg file
Thanks again,
Niche

 

[studio.avarino]

Could this be useful?
http://earth-info.nga.mil/gandg/geotrans/

 

[<<Niçk>>]

I managed by autocad map to turn the coordinates a bit helping me with a juda found online a bit through a tristan guide dated December 2012. :
especially for the trajectory.dwg file I used the reference system ll84. for an aerophotogrammetric to 10000 of the province of Messina instead I adopted italy-e-rome (with italy-e I had a scaffolding). the two files seem to overlap even if not perfectly (vertical cost of 7 max 8 meters). Do you think it might have been wrong? or is it still normal to have a certain deviation because of the fact of having operated transformation of coordinates? I attach an image to you.

at this point, if you want the coordinates tabled in excel it would be possible to extract them from the dwg?

@studio.avarino. thank you but unfortunately I couldn't set the type of coordinates to which I was interested: does not refer to lat and long but to lamda and fi..

 

[Tristan]

Unfortunately I failed to set the type of coordinates to which I was interested: does not refer to lat and long but to lamda and fi..

lambda and phi theoretically should be exactly lat and long

 

[<<Niçk>>]

Okay, then I'll try again.

On the other hand, about the fact that the two dwgs aren't perfectly overlapping, am I wrong or is the problem due to conversion?

to get back from the dwg the coordinates "transformed" in a excel sheet is there any lisp?