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.
My preferred data format is the SURVEX interleaved format i.e
"data diving station depth newline compass length"
though
"data diving from fromdepth to todepth compass length"
or permuations of the above also works well.
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.
Duncan
Hello
Thanks a lot for your answers. It solved my problem.
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.
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.
Cheers,
Xavier
Le 19 oct. 2011 à 10:51, Andrew Atkinson a écrit :
> Hello
>
> 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
>
> 1_25 4_1 0.0 0.0 0.0 0.0 0.0 0.0 0.0
>
> with
>
> equate 1_25 4_1
>
> 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.
>
> Andrew
>
> On 19/10/11 09:13, Xavier Robert wrote:
>> Hi all,
>>
>> I am currently trying to draw a map with diving data. But she I compile,
>> I receive a metapost error. This probably because of the structure of my
>> data, but even after reading The THbook and the Survex tutorial, I do
>> not understand where/why. Can someone give me any advise ?
>>
>> I attach to this emai a zip file that contain :
>> - a simple part of my diving data, with its thconfig file
>> - The associated log file.
>>
>> Thanks a lot !
>>
>> Xav
>>
>>
>> --
>> Xavier Robert
>> Chercheur/Researcher CR2 - IRD
>> ISTerre - Maison des Géosciences
>> 1381 rue de la Piscine - BP 53
>> 38041 Grenoble Cedex 09
>> France
>>
>> Phone :
>> Fax : 33 (0)4 76 51 40 58
>>
>>
>> xavier.robert01@gmail.com <mailto:xavier.robert01@gmail.com>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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