Need help interpreting these coordinates

First, "accuracy to the millimeter" is a bit optimistic. Certainly not with the receiver 2 meters above ground and plumbed up without the benefit of any bracing bipod. To the centimeter is probably more realistic. Hard to be sure but it looks like a Trimble R8 receiver, which is high quality equipment.?ÿ ?ÿ

In spite of being headed as longitude and latitude the coordinates are almost certainly "Easting" and "Northing". In the same manner as x and y on a cartesian coordinate system.?ÿ Coordinates of that magnitude are usually referenced to some larger datum and projection system?ÿ They are almost certainly convertible to latitude and longitude, something I do with my local coordinate systems every day, but I know nothing of the particular systems in use in your country.?ÿ

The surveyor should be willing to share details with you. But here is a rough sketch of how those coordinate relate.

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I agree with Norman.

Most likely Easting/Northing.

ASSUMING that "they" are UTM Coordinates in meters (which they look like);

Your property is about 311 kilometers south of the Equator, and about 156 kilometers West of the Central Meridian of one of about 7 UTM zones that cover Brazil.

OR, I have no clue, which is often the case.

contact the surveyors and ask for geodetic coordinates (latitude/longitude) in SIRGAS 2000.

My best guess was that they were UTM coordinates because

Brazil coordinates UTM E 191,141.09, UTM N 8,251,747.16 (see: https://www.latlong.net/place/brasilia-the-federal-capital-area-brazil-27619.html ) Units are meters.

The UTM Zone for Brazil is 23S???ÿObviously not latitude and longitude. From the output of the tool below, barring input/transcription error, not UTM.

?ÿTool used:

?ÿ http://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html is a tool to transform UTM <> Lat/Lon

output below:

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Is this anywhere near your site? Forgot how big Brazil is.

@norman-oklahoma - I am originally from Holland, so the exact systems in use within Brazil I am not sure about either. Seeing the follow ups, I think you may be right about the E/N. Thanks a million for taking the effort to make this sketch! Amazing!

@loyal - Thanks so much! My terrain is exactly here:

https://goo.gl/maps/vVg6EkBp6dTUHWEJ9

So as for the distance to the equator you definitely may be right.

@geeoddmike - Thanks! A tool like that is exactly what I was looking for.

Yes, I think you are right about the 23S time zone. The town in which the terrain is situated is called Pre?­. When I check, it is the same time zone as Brasilia (city):

When I put the converted coordinates (using your tool) in Google Maps I end up in the Atlantic Ocean...What could be going wrong there? Is Google Maps the wrong tool?

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@geeoddmike - Very close! How did you not end up in the Atlantic? 🙂

But not exactly. The terrain is here:

https://goo.gl/maps/vVg6EkBp6dTUHWEJ9

So I am a lot closer to the coast and more towards the east.

Yes, it's huuuuge.

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Hi all, I am amazed by your swift replies! Thanks a lot.

OK, so I should get the coordinates in SIRGAS 2000 format? Well...to communicate with these guys is a different story. As a matter of fact they still owe me 4 additional coordinates for some palm trees on the terrain, and like 7/8 additional coordinates for the delimitation of a small stream that runs through the terrain. I paid extra for that. But through the grape vine I heard they might have not registered the data correctly. That means they need to go back (and work). And so they are stalling me as it is.

I'll see what I can do and keep you all up-to-date.

Hey all, I received a DWG drawing from these guys.

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A few questions:

• Does any of you have the software to open this file type?
• Can any of you deduce the coordinate system from (hidden) information withing this file?
• Like I said, they owe me additional coordinates. Now I may have been having a bit of a big mouth, because the guy just showed me in a video that the info is in the DWG file, in a layer called "PONTOS". Can any of you see that layer?
• I used an online DWG viewer, which was clearly not advanced enough, because I could not see those additional points. So, related to this; is there a free piece of software I could use to open this DWG file?

Thanks again.

Additional update - in an open question they answered that the coordinates are in UTM, Sirgas 2000.

What ever that may mean 🙂

http://www.sirgas.org/fileadmin/docs/Boletines/Cioce_et_al_2018_SIRGAS_UN_Workshop_GNSS_Argentina.pdf

@wspek UTM zones are NOT time zones. Expanding outward from Prea, I see Fortaleza (a well known site in international geodesy). It is in UTM Zone 30S. I cannot view the images in your original post to run them through a UTM conversion tool. I actually recommend this one: https://geodesy.noaa.gov/TOOLS/utm.shtml

Closely review the prompts to insure your entries are correct. Use UTM Zone 30.

@wspek

Like a lot of others on this board I've got AutoCAD, which is the program you need to open dwg files. However, the file you posted will not open.  

You could download AutoCAD and run it in demo mode, free, for at least a couple weeks. Or you could download Autodesk's Trueview, which is their free viewer software.  

Why are the pictures on this thread unavailable, or maybe it's the firewall here??ÿ Pictures work on other threads.?ÿ Doesn't work on my phone either.

@dave-karoly?ÿ

Same here except problem exists on other threads (E.g. GEOID12B v Geoid 18).

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@dave-karoly

I saw them the other day and today no images will show on Chrome

The pic you posted recently did not open either.

@a-harris

I just tried logging into the site on Edge, same there.

@norman-oklahoma - Thanks, I'll give that free version a try.

I could open the file in a free online DWG viewer of Autodesk. But it did not contain the additional coordinates layer...