Thursday, 10 April 2014

P30 Hill Reclassification Spreadsheet


The Mapping Mountains blog now has a spreadsheet for those interested in the latest reclassifications to P30 hills, either initiated from surveying with the Trimble GeoXH 6000 or through map study. 

The spreadsheet documents P30 classification differences between the information on Mapping Mountains and that in the listing of the TuMPs.  It also documents differences in listings produced by the blog author, and those jointly produced with Aled Williams, compared to the information in the TuMPs.

Any major hill reclassification proposed by the blog author outside of my own listings will also be documented.

The P30 hills that do not appear in the TuMPs have an asterisk (*) beside the date in the Date column, whilst the hills listed as TuMPs that are listed as hills with less than 30m of prominence appear with a double asterisk (**) beside the date.  

The drop figure is that given in my own listings unless a double asterisk (**) appears next to it, this signifies it is the drop figure given in the TuMPs list.  The figures quoted are from notification on the RHB forum, publication of hill listings or publication on this blog.  The spreadsheet has been created for quick access to these details.

To see the P30 Hill Reclassifications Spreadsheet click {here}

The spreadsheet consists of the following:

Date:  Occasionally a hill may have its summit and bwlch surveyed on different days, or the summit and bwlch may be surveyed on more than one occasion.  The date given is just to the day of the first survey.

Name:  This is the name that the hill appears as in the Trimble Survey Spreadsheet.  This name is considered the most appropriate and does not always follow Ordnance Survey composition.  Each name is linked to the relevant post in the Mapping Mountains blog.

1:50,000 Map:    This column gives the number of the 1:50,000 Ordnance Survey Landranger map that the summit of the hill appears on.

Grid Reference:  This is the six figure grid reference for the summit taken from the processed survey data.

Surveyed Height – Summit (m):  This is the height attained from each summit survey after post-processing.  Each height is given to three decimal places.

Surveyed Height – Bwlch (m):  This is the height attained from each bwlch survey after post-processing.  Each surveyed height is given to three decimal places.  Where a height is preceded with a ‘c’ this indicates that the bwlch has not been accurately surveyed with the Trimble and the height has been attained from contour interpolation.

Surveyed Drop (m):  This column gives the vertical height gain from summit to bwlch connecting the hill to next higher ground along the watershed.  This is commonly referred to as ‘drop’, ‘prominence’ or ‘reascent’.  The letter ‘c’ before the drop figure signifies that the bwlch has not been surveyed by the Trimble and therefore part of the drop figure is based upon contour interpolation.  The drop figures are quoted to one decimal place, whereas summit and bwlch heights in the spreadsheet are quoted to three decimal places.  The drop figure is attained from subtracting bwlch height from summit height using three decimal places and then rounding up or down to one decimal place for the result.  Because of this the quoted drop figure does not always compliment the subtracted bwlch and summit heights when subtraction is done from only one decimal place.

Previously Listed Drop:  This is the drop figure previously listed by the blog author, in some instances this may not compliment that used in other P30 listings.

Notes:  This column gives brief details relating to some of the hills.

To see the P30 Hill Reclassifications Spreadsheet click {here}

For greater detail please consult the Trimble Survey Spreadsheet click {here}

Thanks to Mark Trengove for suggesting a spreadsheet listing P30 reclassifications initiated from Trimble surveys.

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