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Hydrographic Data

Posted by Skippern on 15 August 2009 in English.

I have heard that all Brazilian (federal, stately and municipally) survey and statistical data is by law in the public domain. I havn't seen this law, but are willing to put it to the test.

The Brazilian community have already started on a process of importing IBGE data. This is the large data set from the Brazilian Geographical and Statistical Institute. Some have also contacted a few municipals to get survey data files donated to prepare imports of municipals.

I will of corse try to get the same, will start with Guarapari, and after that take a few other municipals where I feel I do the mapping. But I have a bigger idea. Something that can turn into a extremely huge import.

I would like to get my hands on the hydrographic surveys done by the Brazilian navy devition for hydrographic survey. If I can get this, than all navigational bodies of water in Brazil can be imported, along with all ports, lighthouses, buoys, coastline, beaches, water depths, seabed materials, and much much more.

First step will be to get the survey datas, that might take quite some time as I will need to find out where to send the requests.
Next step will be to analize the data to find out how I can get the possition data out of it, and how things are coded.
Than all possitions needs to be converted to WGS84.
Than I need to make import files in OSM format based upon the various datas, and split into chunks.
Than each chunk of each import type must be cleaned in order to remove all duplicates.
When that is done, I can run it through bulk_import.pl or some other bulk import program.

I hope that some of the cleaning can be done in some sort of graphical interface, such as JOSM.

If somebody have experinces, scripts, tools, or hints that can help me along, feel free to leave them here, or contact me in a private message.

Location: -22.660, -40.066
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Discussion

Comment from Minh Nguyen on 15 August 2009 at 22:17

Best not to rely on hearsay when it comes to legal issues.

According to this document, at least their 1:250.000-scale digital maps and county-level census data are public domain. There may be more, but it’s best to look around on the Internet for information about it. I don’t know Portuguese, so unfortunately I can’t search for the law you’re referring to.

Comment from Minh Nguyen on 15 August 2009 at 22:19

Well a presenter at the State of the Map conference also said it’s public domain. You’re probably right, but you know how OSM likes to be extra sure about copyright.

Comment from Skippern on 16 August 2009 at 00:41

I do not plan to just download such data and start working, my plan is to inform them of my purposes and ask them to send me the most uptodate detailed data they have, so that I can work on the latest. Often it seems like the data on the web pages might be the "previous latest". I will feel much more confident about both the uptodate issue and the copyright issue when I have it straight from them.

I will of corse inform them about the entire OSM project, who knows, maybe some there decide to contribute more actively?

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