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<DIV>My way of working is to record the cumulative distance, depth and forward bearing at every station either by using a tagged line or tape measure laid alongside the line. These data are then entered into a spreadsheet and used to claculate the distance between stations.</DIV>
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<DIV>My preferred data format is the SURVEX interleaved format i.e</DIV>
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<DIV>"data diving station depth newline compass length"</DIV>
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<DIV>though</DIV>
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<DIV>"data diving from fromdepth to todepth compass length"</DIV>
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<DIV>or permuations of the above also works well.</DIV>
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<DIV>LRUD data is acquired using a SONAR wand and recorded seperately - rather than enter it in the main body of the data, I tend to put it in a "data dimensions station left right up down" block.</DIV>
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<DIV>Duncan</DIV>
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<DIV>Oct 19, 2011 11:18:52 AM, <A class=parsedEmail href="mailto:therion@speleo.sk" target=_blank>therion@speleo.sk</A> wrote:<BR></DIV>
<BLOCKQUOTE style="BORDER-LEFT: rgb(102,153,204) 3px solid">Hello<BR><BR>Thanks a lot for your answers. It solved my problem.<BR><BR>If I have a zero length leg at the beginning of each centerline, this is because i am importing all the data from visual topo files, and in vtopo, the first line is always a zero length leg to get the LRUD of the fist point. The strange thing is that I have that for normal and topofil data, and it is working very well. I do not understand why it create a metapost error when we use diving data.<BR><BR>And last thing about diving data : when we do a survey in a sump, we have 2 ways to do it : 1) we use a tape, so the length is given between each station. 2) We use a line that is marked every 2 to 5 m, and the length that we read at each station is the length from the beginning of the sump/underwater survey. In that case, it works as a topofil/counter. However, it is not allowed in diving data declaration. It could be interesting to allow it this kind of data.<BR><BR>Cheers,<BR><BR>Xavier<BR><BR><BR><BR>Le 19 oct. 2011 à 10:51, Andrew Atkinson a écrit :<BR><BR>> Hello<BR>> <BR>> So station 1_25 is the same as 4_1 and you have connected them together with a zero length leg. Not sure why this does not work, but if you replace<BR>> <BR>> 1_25 4_1 0.0 0.0 0.0 0.0 0.0 0.0 0.0<BR>> <BR>> with<BR>> <BR>> equate 1_25 4_1<BR>> <BR>> it gets rid of the stream of errors, I also find equates easier to read than zero length legs, especially as you have a cross section of 0 which seems unlikely.<BR>> <BR>> Andrew<BR>> <BR>> On 19/10/11 09:13, Xavier Robert wrote:<BR>>> Hi all,<BR>>> <BR>>> I am currently trying to draw a map with diving data. But she I compile,<BR>>> I receive a metapost error. This probably because of the structure of my<BR>>> data, but even after reading The THbook and the Survex tutorial, I do<BR>>> not understand where/why. Can someone give me any advise ?<BR>>> <BR>>> I attach to this emai a zip file that contain :<BR>>> - a simple part of my diving data, with its thconfig file<BR>>> - The associated log file.<BR>>> <BR>>> Thanks a lot !<BR>>> <BR>>> Xav<BR>>> <BR>>> <BR>>> --<BR>>> Xavier Robert<BR>>> Chercheur/Researcher CR2 - IRD<BR>>> ISTerre - Maison des Géosciences<BR>>> 1381 rue de la Piscine - BP 53<BR>>> 38041 Grenoble Cedex 09<BR>>> France<BR>>> <BR>>> Phone :<BR>>> Fax : 33 (0)4 76 51 40 58<BR>>> <BR>>> <BR>>> <A class="parsedEmail parsedEmail" href="mailto:xavier.robert01@gmail.com" target=_blank>xavier.robert01@gmail.com</A> <<A class="parsedLink parsedEmail" href="mailto:xavier.robert01@gmail.com" target=_blank>mailto:xavier.robert01@gmail.com</A>><BR>>> <BR>>> <BR>>> <BR>>> <BR>>> <BR>>> <BR>>> <BR>>> <BR>>> <BR>>> _______________________________________________<BR>>> Therion mailing list<BR>>> <A class="parsedEmail parsedEmail" href="mailto:Therion@speleo.sk" target=_blank>Therion@speleo.sk</A><BR>>> <A class=parsedLink href="http://mailman.speleo.sk/mailman/listinfo/therion" target=_blank>http://mailman.speleo.sk/mailman/listinfo/therion</A><BR>> _______________________________________________<BR>> Therion mailing list<BR>> <A class="parsedEmail parsedEmail" href="mailto:Therion@speleo.sk" target=_blank>Therion@speleo.sk</A><BR>> <A class=parsedLink href="http://mailman.speleo.sk/mailman/listinfo/therion" target=_blank>http://mailman.speleo.sk/mailman/listinfo/therion</A><BR><BR>_______________________________________________<BR>Therion mailing list<BR><A class="parsedEmail parsedEmail" href="mailto:Therion@speleo.sk" target=_blank>Therion@speleo.sk</A><BR><A class=parsedLink href="http://mailman.speleo.sk/mailman/listinfo/therion" target=_blank>http://mailman.speleo.sk/mailman/listinfo/therion</A><BR></BLOCKQUOTE></BODY></html>