Therion and DistoX Training Course Guide - 1) Exporting data from a PDA

Exporting Survey Data from a PDA

The survey data and drawings done underground on the PDA are all saved in a PocketTopo file with the file extension ‘.top’. We need to export this data in a format which captures all the information in plain text files which can be read on any computer. These will be used to import the data into Therion, but also to archive the data in a format that will be readable to people in the future without needing PocketTopo and a computer which can run it.

Open the ‘bpw.top’ file in PocketTopo (using the File/Open menu). You should see the numbers representing the survey data, and also be able to view the sketches in PocketTopo.

Select File/Export/Text from the menu. On the window that opens, change the location to one of your memory cards (rather than main memory), chose a folder on your memory card and enter ‘bpw’ in the name field. Then click Save. This will save a file named ‘bpw.txt’ to your memory card. This file contains all the survey data (the numbers), including the trip date, declination, and any comments you added.

Select File/Export/Therion from the menu. On the window that opens, change the location to one of your memory cards (rather than main memory), chose a folder on your memory card and enter ‘bpwth’ in the name field. Then click Save. This will save a file named ‘bpwth.txt’ to your memory card. This file contains both the data and drawings in a format which can be imported into the Therion software.

We should now have all our data saved onto the memory card on the PDA. (This is assuming you kept the original .top file on the memory card during the survey trip. It is recommended to do this as it means you can still get your data out if your PDA was damaged while underground. You can still remove the memory card from a dead PDA and read it on another computer. But you will not be able to read from the built in memory of the PDA if the device got broken).

File Organisation

The following procedures are recommendations rather than a required way of working. The important point is to preserve your raw data files because these represent the hard work of the survey done underground. Everything else can be regenerated from these files if you have not lost or edited them. So we are going to put them in their own folder to keep them safe while we work on the drawings. Create a main folder for your project. We called ours ‘Bull Pot’. Inside this create a second folder named ‘PocketTopo’ and copy the files from your PDA memory card into this PocketTopo folder on your computer. You should have the following files in there:

bpw.top
bpw.txt
bpwth.txt

These are the original data files and the intention is that these are never edited directly. We are backing them up to keep them safe. We are now ready to start learning Therion.