Abstract
The National Agricultural Statistics Service (NASS) surveys United States’ and Puerto Rico’s agriculture for the purpose of making estimates on crops, livestock, production practices, farm economics, etc. One of these surveys is the annual June Area Survey. The survey requires field enumerators to physically go to sampled land areas (segments) designated on aerial photos and collect information on agricultural activity within the land area. Sometimes these land areas are difficult to find due to similarity in geography and missing road signs. In 2005, NASS researched whether handheld Global Positioning System (GPS) receivers would be helpful in locating the sampled segments. All aerial photos contained the latitude and longitude coordinates of the centroid of the segments for the enumerators to compare with their readings on the GPS receivers. Field enumerators could then tell if they were in the general location of a segment or miles away.
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