When I was doing commercial brewery work I lived in my Carhartt’s. I like the double fronted rip stop design. I’d get almost a year out of a pair washing them DAILY when I’d get home from work. I was around all sorts of gnarly chemicals, metal that could snag, and pocket fulls of parts and tools. My only issue with them is the black color fades a little quickly. I would go back to them for sure. They could very well work for surveying too.