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July 29, 2015
Two ASPRS Awards for “Pit-Free” CHM Algorithm

July 29, 2015 — The paper “Generating Pit-free Canopy Height Models from Airborne LiDAR” co-authored by rapidlasso GmbH and published in the September 2014 issue of PE&RS (the journal of the ASPRS) was awarded twice at the IGTF 2015 – ASPRS Annual Conference in Tampa, Florida last May. The paper took home the John I. Davidson President’s Award for Practical Papers (2nd Place) as well as the Talbert Abrams Award (2nd Honorable Mention).

The John I. Davidson President’s Award for Practical Papers (2nd Place).

The “pit-free” CHM paper wins the John I. Davidson President’s Award for Practical Papers (2nd Place) and the Talbert Abrams Award (Second Honorable Mention).

The “pit-free” CHM paper is joint work with Anahita Khosravipour, Andrew K. Skidmore, Tiejun Wang, and Yousif A. Hussin of ITC and University of Twente. It describes a technique that can create raster Canopy Height Models (CHMs) without the so called “pits” that tend to hamper subsequent extraction of individual tree attributes such as number, location, height, and crown diameter. The paper uses data measured in the field by ITC researchers to show that “pit-free” CHMs significantly lower the commission and omission errors in single tree detection.

Side-by-side comparison of a "standard" CHM and a "pit-free" CHM.

Visual side-by-side comparison of a “standard” versus a “pit-free” CHM.

The “pit-free” CHM algorithm can easily be implemented with LAStools either by modifying an available batch script or by executing the LAStools Pipelines distributed with the toolboxes for ArcGIS and QGIS. A detailed blog article that compares various different methods for creating CHMs is available via the Web pages of rapidlasso GmbH.

We at rapidlasso GmbH like to especially congratulate the main author, Ms. Anahita Khosravipour, who managed to get two awards with her very first academic publication. Those who like our “pit-free” CHM algorithm will probably also love the new technique that our team will introduce later this year at SilviLaser 2015 in France.

About rapidlasso GmbH: Technology powerhouse rapidlasso GmbH specializes in efficient LiDAR processing tools that are widely known for their high productivity. They combine robust algorithms with efficient I/O and clever memory management to achieve high throughput for data sets containing billions of points. The company’s flagship product – the LAStools software suite – has deep market penetration and is heavily used in industry, government agencies, research labs, and educational institutions. Visit http://rapidlasso.com for more information.

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