; Dow Cave - Providence Pot system, including Dowbergill Passage

; Created 27/10/2015 by Patrick Warren (PBW) from an original by Steve Warren

; Surveyed 1982 (Dow Cave) -- 2015 (Dowbergill upstream of 800 yds chamber)

; Historically Providence Pot was classed as from the entrance to Stalagmite
; Corner, and the rest was classed as Dowbergill Passage (or Dowber Gill
; Passage), part of Dow Cave -- N. Brindle, CPC Journal 2(1), 4-9 (1955).
; The usage here 'Dowbergill Passage' follows Northern Caves vol 1 (1972-9).
; In terms of the survey data, Dowbergill Passage splits naturally at 800 yds
; chamber, where the WRPC re-survey ended in 2004.
 
; Magnetic declinations in individual files were originally calculated
; using the International Geomagnetic Reference Field (IGRF) model,
; with the online NOAA magnetic declination calculator, for the
; location (WGS84) 54.14929 N, 2.04008 W corresponding to SD 97480
; 72608 (Dowbergill Bridge, just above Kettlewell).  All these
; declinations are now commented out, as this method is deprecated in
; favour of using the *declination auto command below.  However it has
; been verified that both methods generate the exact same reduced
; survey data.

; People involved (in alphabetical order):
; Steve Barwick, Howard Beck, Simon Beck, David Bradley, Andy Cole,
; Peter Lamb, Becka Lawson, Shawn McMinn, Dave Morris, Russel Myers,
; Dennis Round, Gareth Sewell (Sweeney), Carmen Smith, Patrick Warren,
; Steve Warren, Edward Whitaker, Peter Whitaker.

; Clubs involved (in alphabetical order):
; Craven Pothole Club (CPC)
; Red Rose Cave and Pothole Club (RRCPC)
; White Rose Pothole Club (WRPC)

; Input CRS *fixes are NGR references, relative to the SW corner of
; the Ordnance Survey SD grid square, ie SD 000 000.

; Output CRS is the British National Grid + ODN (EPSG:7405)
; equivalent to full numeric NGR references. 

*cs OSGB:SD
*cs out EPSG:7405

; *cs out EPSG:3042 ; WGS84 UTM zone 30N (includes zone 30U)

; Mag dec calculated for SD 97480 72608 alt 225m
; Dowbergill Bridge, just above Kettlewell
*declination auto 97480 72608 225

*title DowProv

*include DowCave
*include Dowbergill1
*include Dowbergill2
*include ProvidencePot

*equate DowCave.dow2.31 Dowbergill1.dgp1.1
*equate Dowbergill1.dgp5.16 Dowbergill2.dgp6.46
*equate Dowbergill2.dgp7.1 ProvidencePot.PPot6.15

*flags surface
*include HagDyke ; surface feature -- building
*flags not surface
