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Science 23 November 2007:
Vol. 318. no. 5854, p. 1240
DOI: 10.1126/science.1145424
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Technical Comments

Response to Comment on "Roadless Space of the Conterminous United States"

Raymond D. Watts,1* Roger W. Compton,2 John H. McCammon,2 Carl L. Rich,2 Stewart M. Wright,2 Tom Owens,2 Douglas S. Ouren1

Girvetz et al. criticize our work and the value of the roadless volume (RV) metric, basing their arguments on the artificial imposition of wildlife habitat connectivity as the context. We counter that in our intended contexts, both practical and geographic theoretical considerations make RV an appropriate measure of the space between roads.

1 U.S. Geological Survey (USGS), Fort Collins, CO 80526–8118, USA.
2 USGS, Denver, CO 80225–0046, USA.

* To whom correspondence should be addressed. E-mail: rwatts{at}usgs.gov

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Science. ISSN 0036-8075 (print), 1095-9203 (online)