Data may be gathered through site analysis, site surveys and geotechnical investigations. The assessment of job satisfaction through employee anonymous surveys became commonplace in the 1930s. Topographic maps are based on topographical surveys. There were also concerns about the data quality and the reliability of reputation surveys. Navies also undertake hydrographic surveys and intelligence gathering. This includes the first Ordnance Surveys of Ireland, conducted in the early 19th century. The first major national surveys of sexual behavior were the Kinsey Reports. Consumer demand was calculated by computers from data gathered by surveys. The Review contained the summaries of these surveys. The index is calculated by a combination of export data and public surveys. The Dutch Hydrographic Service is responsible for relevant hydrographic surveys. Businesses can get information by customer feedback, employee surveys. Other surveys on this topic show comparable results. This is similar to the results reported for surveys of the general American public. It is of special concern for the production of precise maps and surveys.