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Surviving Range Control and Quadrant Towers
18 Feb 2014 19:57 #11
by REF
Do you have a location for the one at Titchwell?
I am going to updat the first post with known locations, and links to them.
Replied by REF on topic Surviving Range Control and Quadrant Towers
The only ones I have listed for Norfolk and Suffolk with QS remains are: Grimston Warren (those very tall concrete pillars), Rushford (I believe you have photographed that one) and Titchwell (Which I have photographed). I don't recall if you photographed the decoy bunker next to the quadrant shelter at Rushford and I also believes the concrete arrow remains to the east of the QS but covered in a thin layer of growth, obscuring it from the air. A LIDAR photo would show it if it is there but it is probably cheaper to go with a metal rod and map out the "thunks" via GPS
Thunk = Technical term for the sound of metal rod hitting concrete (PS I just made that up but it might become common usage if I use it enough)
Do you have a location for the one at Titchwell?
I am going to updat the first post with known locations, and links to them.
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18 Feb 2014 22:30 #14
by Peter Kirk
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
Replied by Peter Kirk on topic Surviving Range Control and Quadrant Towers
I noticed on GE that when you mark a location based on the current aerial view the older dates don't always match up and the mark can be yards off. Also when converting them to NGRs they have a similar variance depending which datum you use. I know this has been covered before but I wanted to reiterate it as it explains why some GE flags can be wrong or apparently wrong.
I prefer to record using NGR as it seems the most stable method plus it helps those that still use maps
I prefer to record using NGR as it seems the most stable method plus it helps those that still use maps
No Amount Of Evidence Will Ever Persuade An Idiot (probably not Mark Twain)
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19 Feb 2014 00:42 #16
by jorge
'stable method'? OSGB use WGS84 and aerial photography before doing a transformation (to OSGB36 for non-military land mapping of the British Isles...maritime, aviation and military maps don't use OSGB36).
'yards off' yet you use OSGB NGR which has always been based on the metric system of measurement
I use maps...but I also use decimal degrees for positions as they are far more useful.
...will try not to drift again (well no more than the 2.5cm that the British Isles drift per year)
Replied by jorge on topic Surviving Range Control and Quadrant Towers
I noticed on GE that when you mark a location based on the current aerial view the older dates don't always match up and the mark can be yards off. Also when converting them to NGRs they have a similar variance depending which datum you use. I know this has been covered before but I wanted to reiterate it as it explains why some GE flags can be wrong or apparently wrong.
I prefer to record using NGR as it seems the most stable method plus it helps those that still use maps
'stable method'? OSGB use WGS84 and aerial photography before doing a transformation (to OSGB36 for non-military land mapping of the British Isles...maritime, aviation and military maps don't use OSGB36).
'yards off' yet you use OSGB NGR which has always been based on the metric system of measurement
I use maps...but I also use decimal degrees for positions as they are far more useful.
...will try not to drift again (well no more than the 2.5cm that the British Isles drift per year)
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