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These data were originally digitized from USGS quadrangle maps and have since been updated and maintained by the AHTD cartographers using current black and white photography . Other stuff : I am passionate about black and white photography , and have a darkroom set up at home . Although , I am deeply devoted to black and white photography , my two favorite artists are Pablo Picasso and Henri ' Matisse . By combining all of that information , by looking at the surface from different directions , we can generate effectively very high-resolution images , almost identical to black and white photography . Around 1900 , before the advent of color photography , " silver prints " based on silver bromide constituted high quality black and white photography . About the photographer : Les Allert , BLM Computer Specialist , enjoys black & white photography and working in the darkroom .