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ASPRS Releases Guidelines on Vertical Accuracy Reporting Requirements for LiDAR-Derived Elevation Data 8.24.04

Adoption of the "ASPRS LiDAR Guidelines - Vertical Accuracy Reporting for LiDAR Data V1.0" was approved by the American Society for Photogrammetry and Remote Sensing (ASPRS) Board of Directors in May 2004. This is the first in a series of guidelines to be published by ASPRS covering the emerging technology of LiDAR and its use in the mapping sciences. Created by the ASPRS LiDAR Committee's Working Group on LiDAR guidelines and standards, the guidelines have undergone a public review process and represent the best practices and reporting methods endorsed by ASPRS when working with LiDAR-derived elevation data.

ASPRS recommends that all mapping professionals adhere to and follow these guidelines when generating or contracting for mapping products derived from LiDAR data. As part of the LiDAR Committee's Working Group efforts, the ASPRS guidelines were harmonized with the relevant sections of the Guidelines for Digital Elevation Data (Version 1.0) released by the National Digital Elevation Program (NDEP).

The guidelines cover the recommended methods for measuring and reporting the vertical accuracy of elevation data recorded by airborne LiDAR mapping instruments. Essentially, they outline necessary steps to analyze the vertical accuracy of elevation data generated using airborne light detection and ranging or laser radar (LiDAR) technology. In addition, the Guidelines cover determining what level of accuracy can be associated with a mapping product, such as a contour map, that is generated from a given LiDAR data set (or conversely, what level of accuracy is required in the LiDAR data to support a given contour interval map). Finally, they also include recommendations for the proper planning and implementation of appropriate ground checkpoints to support a LiDAR data set, including how to handle different land cover classes across a project site.

ASPRS strongly encourages all LiDAR stakeholders to incorporate these guidelines into their LiDAR mapping projects. A copy of the guidelines can be downloaded from the LiDAR Committee section at (under the Photogrammetric Applications Division) or requested from . Other LiDAR guidelines currently under development by ASPRS for release in 2004 and 2005 include "Horizontal Accuracy Reporting," "Sensor Calibration," and "Laser Eye Safety.

Source: ASPRS, Aug. 19, 2004

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