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Digital Cameras for a Photogrammetric Production Environment: a Test of the Geometric Stability and Accuracy
Photogrammetry Mapping Digital Camera Geometry Accuracy
2015/11/23
The use of digital cameras in the photogrammetric work flow has gained widespread acceptance over the past few years. Whereas the geometric specifications of analogue aerial cameras have been thorough...
![](http://www.firstlight.cn/upload/imgfile/201412/1/2014121164539356.jpg)
New tracers can identify frack fluids in the environment(图)
environment dentify frack fluids
2014/12/1
Scientists have developed new geochemical tracers that can identify hydraulic fracturing flowback fluids that have been spilled or released into the environment.
![](http://www.firstlight.cn/upload/imgfile/201412/1/2014121162537231.jpg)
New tracers can identify frack fluids in the environment(图)
environment identify frack fluids
2014/12/1
DURHAM, N.C. – Scientists have developed new geochemical tracers that can identify hydraulic fracturing flowback fluids that have been spilled or released into the environment.
The tracers, which were created by a team of U.S. and French researchers, have been field-tested at a spill site in West Virginia and downstream from an oil and gas brine wastewater treatment plant in...