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A accuracy The closeness of an estimated value (for example, measured or computed) to a standard or accepted (true) value of a particular quantity. See precision. • absolute accuracy A measure that accounts for all systematic and random errors in a dataset. Absolute accuracy is stated with respect to a defined datum or reference system. • accuracyr (ACCr) The National Standards for Spatial Data Accuracy (NSSDA) (Federal Geographic Data Committee, 1998) reporting standard in the horizontal component that equals the radius of a circle of uncertainty, such that the true or theoretical horizontal location of the point falls within that circle 95 percent of the time. ACCRMSErr=×17308.. • accuracyz (ACCz) The NSSDA reporting standard in the vertical component that equals the linear uncertainty value, such that the true or theoretical vertical location of the point falls within that linear uncertainty value 95 percent of the time. ACCRMSEzz=×19600.. • horizontal accuracy The horizont...

The International LiDAR Mapping Forum (ILMF) , taking place from February 11-13 2013 in Denver, is delighted to announce that the American Societyfor Photogrammetry and Remote Sensing (ASPRS) will be running special ‘hot topics’ sessions alongside the main conference.  ASPRS plays a vital role in the lidar industry as it is the key organization that sets data format and accuracy standards for kinematic laser scanning.  With a full morning dedicated to ASPRS on February 11, it will be sharing the results of crucial projects to benefit the lidar community; providing information to help improve accuracy and cost efficiency.         Lewis Graham, Lidar Division Director of ASPRS , will kick off the morning by revealing exciting new plans for the development of LAS validation software.  LAS is the standard data delivery format used throughout the world.  It is supported in all commercial lidar hardware and software and is...