![]() 2009a, 2009c, in preparation Otárola et al. 2009b, 2009c in preparation) are descriptions of the equipment used, the efforts undertaken to ensure data quality, and the methods by which the individual pieces were put together to create systems that operate reliably and autonomously at remote sites. 2009, in preparation) provides a detailed account of the process by which the candidate sites were selected. It contains descriptions of the general principles underlying the TMT site-testing work and the selection of the candidate sites, as well as summaries of the instrumentation, methodology, and the top-level results. ![]() This paper is the first in a series of 12 articles, hereafter referred to as "TMT Site Testing 1 to 12" (TST-1 to TST-12), describing the TMT site-testing process. ![]() The practical work at the sites was preceded by several years of preparatory work, most notably a series of satellite data studies of cloud cover and precipitable water vapor (PWV) of sites in Chile, southwestern North America, and Hawaii, on the basis of which the candidate sites were selected. This decision officially ended the TMT site-testing work after five years of in situ measurements, during which at least 2.5 annual cycles of data were acquired on each of the five candidate sites. In April 2008, the Thirty Meter Telescope (TMT) Project reduced its short list of candidate sites to two, Cerro Armazones in northern Chile and the "13 North" (13N) site on Mauna Kea, Hawaii.
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