Data harvested from the sky may give researchers a view into the future of food production while opening insights to the implications of climate change.<\/p>\n
The five-year, $3.5 million project funded by NASA will make use of existing satellite imagery to produce the first-ever global survey of croplands. Northern Arizona University assistant research professor Temuulen \u201cTeki\u201d Sankey<\/strong>, a remote sensing ecologist, will put her skills to work as part of a multi-institute team trying to answer the question of \u201cWhere is all the food going to come from?\u201d to feed a growing world population.<\/p>\n \u201cThis has never been done before at the scale we\u2019re looking at,\u201d said Sankey, noting the 30-meter resolution satellite images will allow her and other researchers to identify eight different crops and changes in acreage over the past four decades.<\/p>\n The Landsat images are stored and managed by the U.S. Geological Survey and are publicly available. But examining a world\u2019s worth of them in 30-meter pixels over 40 years takes a cluster of supercomputers and a series of intricate algorithms.<\/p>\n \u201cIf you want to map the entire world in this kind of detail, it takes a massive, massive amount of data,\u201d Sankey said. \u201cIn recent years, the technology has caught up with the kinds of data that a person could imagine using.\u201d<\/p>\n Yet all that technology will still need an assist. To validate that conclusions drawn from the satellite images are accurate requires \u201cground data.\u201d<\/p>\n According to Sankey, \u201cWe are going to look at our own map and ask, \u2018Really, is it true that 20,000 acres are being cropped in this location?\u2019 Then we need someone from that area to tell us that yes, it\u2019s true, or that our analysis is inaccurate.\u201d<\/p>\n Over the years, members of the research team have compiled a library of such information, but \u201cwe are trying to come up with a systematic and intelligent way to survey the Earth,\u201d Sankey said. One possibility is a web page to which the public can contribute.<\/p>\n Sankey\u2019s own research has focused on the study of vegetation cover to determine land-use changes over decades of time. She explained that climate science may gain from the mapping project because of the details it will reveal about natural vegetation lost to cropland expansion. Climate scientists rely on maps in coarser pixels that may not show such details, she said, which means there may be less or more vegetation than currently believed to absorb carbon dioxide.<\/p>\n \u201cWith our maps, they can come up with better estimates of what\u2019s going on with carbon storage globally,\u201d Sankey said. \u201cThen they can produce a more accurate model for climate change.\u201d<\/p>\n Other partners in the project include the U.S. Geological Survey, California State University at Monterey Bay, NASA Ames Research Center, NASA Goddard Space Flight Center, the University of New Hampshire, the University of Wisconsin and Bay Area Environmental Institute.<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":"