Sv: Re: [Qgis-user] Creating polygon from points in csv file

[Ulf Almroth]

Hi,

Using an attribute is agood idea. A lot of measuring devices 
generating ascii files with coordinates, e.g. various type of surveying 
equipment and coordinate measuring devices 
for industrial use produces file that basically look like this:

featuretyp, X,Y,Z,pencode

A sample file from a steroplotter used for mapping arial images with 
sterooverlpa looks like this:

BBH  1868462.502  7323256.557  5.266  21
BBH  1868458.596  7323265.540  5.266  22
BBH  1868452.062  7323262.698  5.266  22
BBH  1868455.967  7323253.716  5.266  22
BBH  1868462.502  7323256.557  5.266  23
BBH  1868359.027  7322916.789  6.259  21
BBH  1868357.951  7322925.557  6.259  22
BBH  1868351.513  7322924.767  6.259  22
BBH  1868352.589  7322915.999  6.259  22
BBH  1868359.027  7322916.789  6.259  23

where   21  signifies the styart of the polygon (or line) and 23 the 
end. 

Regards 

Ulf Almroth


----Ursprungligt meddelande----
Från: goyodiaz at gmail.com
Datum: 2010-05-20 00:03
Till: "MORREALE Jean Roc"<jr.morreale at enoreth.net>
Kopia: "qgis-user List"<qgis-user at lists.osgeo.org>
Ärende: Re: [Qgis-user] Creating polygon from points in csv file

El mié, 19-05-2010 a las 22:20 +0200, MORREALE Jean Roc escribió:
> Hi Goyo,
> 
> I would like to test your file but I can't not extract the file from 
the 
> tar.bin, could you resend it using a more common format ?

The original author, Pavol Kapusta, uploaded (a new version of) it to
the contributed repository so you should be able to install it using 
the
plugin installer (plugins > Install python plugins).

Please send bug reports and suggestion here or to me.

> 
> Your modification is great as it would solve a major pain I've been 
> dealing with my tacheometer's output, it is a basic ascii file where 
> every record is a point to which you can append a codification.
> 
> For now we've to connect the point by hand, automating this task 
would 
> be a relief (and a lot less error prone).
> 
> Would it be easier to make a correct geometry by assigning a code to 
the 
> point telling if it's the opening or the closure ? Or just following 
the 
> incrementing point number would be enough to get a correct geometry ?

As for now the plugin assumes the points are in the proper order.
Sorting them by an attribute sounds like a good idea to me, I'?l think
about it.

Goyo

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