The U.S. government plans to drop a very old way of measuring a foot over large distances.Land surveyors in the United States currently have two choicesfor measuring the 12-inch measurement known as a foot.Some use what is known as the U.S. survey foot.Others use a more widely accepted definition of the measurement, known as the international foot.The international foot measurements are based on the meter.The U.S. survey foot is a bit longer, about 0.01 foot per mile,the National Oceanic and Atmospheric Administration, or NOAA, reports on its website.The difference is so small that it cannot be seen by looking at a traditional 12-inch ruler.But when measuring large distances, that small amount matters.It sometimes leads to errors and misunderstandings.The U.S. government officially accepted the international foot as the nationwide standard in 1959.But it permitted surveyors to keep the old U.S. survey foot in a decision that was meant to be temporary.Today, surveyors in 40 American states and territories still use the larger U.S. foot.But the government says it will officially cancel the survey footin 2022 and replace it with the international foot.NOAA and the National Institute of Standards and Technology announced the change earlier this year.Michael Dennis is a project manager for NOAA's National Geodetic Survey.The agency studies geodesy, a science that seeks to measure the sizeand shape of the earth and identify exact positions on its surface.Dennis told The Associated Press that the two standards have caused"chaos" for surveying and mapping operations.He said the difference in foot measurements caused problemsduring planning for a high-speed rail project in California.It also created difficulties for a major bridge project linking Oregon, which uses the international foot,to Washington, which uses the U.S. one, Dennis added.Dennis also gave an example that he heard about a state airport project.He said there were misunderstandings between the builders and planners of the projectbecause they were in two states that used different foot standards.The problems led to building delays, extra costsand the redesign of one building to be one floor shorter, Dennis added."It's embarrassing that we even had this going on for 60 years," he said.Still, Dennis admits that some surveyors might find it hardto accept the international foot after so many years.The U.S. foot "sounds very patriotic, very American,"Dennis said in an internet video presentation explaining the change.However, he said he thinks it makes sense for people in the United Statesto be using the same measuring standard as the rest of the world.