Loading survey data with varying magnetic declination over time in same cave system

CaveRenderPro � CaveRenderPro � Forum � Loading survey data with varying magnetic declination over time in same cave system

Themen-Einstellungen

Thema drucken

Bereich wechseln

CaveRenderPro Forum Verbesserungen Fehlermeldungen Benutzerhandbuch Release Notes CaveRenderPro-App

#1 | Loading survey data with varying magnetic declination over time in same cave system datum

03.10.2023 05:39

I have been loading cave survey data and merging data sets by copying and pasting into a 'master cave' file as recommended on forum. But what happens to data declination value when you copy and paste it? Is it now using the receiving file declination or is the old declination preserved?
Also please inform what you recommend as best procedure for loading pocket topo data files with 'Actual Trip' option used and different declinations and biographical/instrument changes present within the same file? Must the file be split up? We had a long survey program in a 14km cave interrupted by covid and declination change was significant. Thanks.

Antworten

#2 | RE: Loading survey data with varying magnetic declination over time in same cave system datum

03.10.2023 12:18

Zitat von Mark E Tringham im Beitrag #1
I have been loading cave survey data and merging data sets by copying and pasting into a \'master cave\' file as recommended on forum. But what happens to data declination value when you copy and paste it? Is it now using the receiving file declination or is the old declination preserved?

The Mag Dec and Mag Var at various times and/or locations can be defined in File > "Instruments". You give each "Instruments" a unique ID. Then in your data table(s), each line can be set with a different instrument ID. To make it work as expected you also need to fill the date field as well in the data table.

I don't have an exploration area big enough to get significant Mag Dec differences at the cave entrances of my networks and Mag Var is stable enough over a year. So I set one "Instrument" per year (i.e. 01.01.YYYY) and let the mag var and data line date deal with the calculation. But if you have some caves far appart to get significant Mag Dec at the entrances, you can set different "Instruments" for the same year but for different locations.
I import raw data (not processed with mag dec) from TopoDroid - Can't say much about Pocket Topo as I never used it. As soon as the new data set is imported in CRP, all the new data lines are highlighted, so I use the value/replace feature to set Instrument (ID), Date, Surveyor (ID).

Hope this help.

Thomas Marguet
https://eegc.org
http://www.sc-epia.com

Antworten

#3 | RE: Loading survey data with varying magnetic declination over time in same cave system datum

03.10.2023 22:45

Thankyou so much, I see how this works now and will work in this way with instruments and dates all set correctly so that declination changes are accounted for.
Mark T.

Antworten

Messdaten von unterschiedlichen Daten verbinden � � Loading Compass data into CRP