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Abstract

During the past decade, Geographic Information Systems (GISs) have become widely used in many disciplines and that has created demands for accurate high-resolution digital data, especially digital imagery. Photogrammetry has emerged as one of the most important disciplines employed in the collection of spatially related information for use in GIS databases, especially for terrestrial landscapes. This study assessed the horizontal and vertical accuracy of the Applanix Digital Sensor System (DSS"") 301 orthophotographs. The study area was located on the University of Arkansas at Monticello campus and included 950 acres. To assess the spatial accuracy of the DSS, 56 Ground Control Points (GCPs) were collected prior to image acquisition using Trimble Surveying grade 4700 Global Positioning Systems (GPS). The 28 stereo aerial photographs used to create the orthorectified mosaic were taken with the DSS™ 30I, with approximately a 15.24 cm pixel spatial resolution. The average horizontal Root Mean Square Error (RMSE) for the DSS'" mosaic was 0.212m using the GPS-aided Inertial Measurement Unit (IMU) and 0.194 m from the mosaic created using one GCP per photo with the IMU. The vertical RMSE was 0.371 m for the 2-meter DEM created from stereo imagery using only the IMU.

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