24 June 2011 Twas in Action Priceless data Although massive amounts of data from sources such as Landsat have become open access, users still face many obstacles, says TWAS Public Information Officer Daniel Schaffer in a feature article published on SciDev.Net. Read the article on SciDev.Net: Free data has great value, but challenges remain Tags SciDev.Net news_item 2011 open access