In this issue, we have three peer-reviewed articles. The first article in this issue is by Dr. Michel Morgan from the School of Construction, Southern Alberta Institute of Technology. The title of the paper is Inverse Interpolation for Terrain Modeling using LiDAR Data. The paper discusses a single-step terrain extraction algorithm using the inverse interpolation model in a single step. The paper presents the mathematical model and details the proceed for implementing the algorithm. This is supported by several applications in different terrains. Inspection of the extracted terrain was conducted visually and the results looked promising. The second article in this issue is by Professor Thomas Mayer from the Department of Natural Resources & the Environment at the University of Connecticut. The title of the article is "Reducing Slope Distances without Using an Elevation Factor". The article presents two formulas to find a chord of a normal section and an arc of a circle, with a radius that matches the reference ellipsoid, from slope distances. Several tests were conducted and results showed less than centimeter level accuracy with lines of 10-kilometer or less in length and heights 1,725 meters and less. In addition, the second method works better for lines of heights less than 430 meters.
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