Founder and Principal Consultant at EvrBilt, Chairperson at Little Britain Challenge Cup
Some interesting discoveries on my first comparison of the recent (31 Jan 24) Geospatial Survey Specification from Historic England. Much of the requirement/guidance remains similar, though notably BIM has been removed from this version and in my view remains to be clearly defined. I do like that the guidance continues to press home the importance of repeatability and the necessity of permanent networks. I wish this was taken more seriously in general built environment works. What particularly caught my eye is that the maximum GSD (ground sampling distance) has been reduced significantly. I took a look at some of our larger scale flying projects like this one in Winchester: https://lnkd.in/eRgQmUVT This was flown with a common workhorse combination of the DJI M300 and P1 camera at around +60m above ground. 6 passes - double nadir and 4 oblique passes to provide elevation data. It maybe the obliques throwing the stats out but this averages 12mm GSD which would only make it suitable for 1:500 scale in the new guidance. Flying this configuration is an economical approach with mid cost range equipment and I have always thought provides a good base for topographic survey. Our traversed ground control showing it achieves +/-25mm. Be interested to know others thinking. One final comment and maybe I'll be accused of being too woke for this one. IMO its really time we stopped referring to UAVs as un-manned, you'd think in this day and age institutions would adopt the common term un-piloted in acknowledgement that pilots aren't only men. Detail matters as so much of the rest of the specification makes clear. #heritage #conservation #topographicsurvey #measuredsurvey #photogrammetry #estatesmanagement #architecture #engineering https://lnkd.in/dfCyqxtv
Might be of interest Angel Lock, Paul Channing.
Keynote Speaker. Creator of the #GenerativeAIforRealEstatePeople Course | Master Generative AI in Real Estate: antonyslumbers.com/course | AI won’t take your job—someone using AI will. @genaiforrealestate on Instagram
3moDon’t understand the technical details but your Winchester model is terrific. Amazed what is possible.