HALIS was recently selected to complete corridor mapping on 15 individual sites throughout the state of Alabama. The total project is 315 miles in length, with each corridor expected to cover a 400’ width. The project was awarded following successful completion of a smaller pilot project for the same client, proving HALIS’ responsiveness and technical expertise necessary to provide the high detailed datasets needed. Alabama Power is known to have some of the most stringent classification requirements in the industry.
Data acquisition for the Alabama Power Spring 2017 project included the coordination of field survey crews for mapping control, deployment of weather stations for data gathering during aerial flights, and aerial LIDAR and imagery acquisition (nadir and oblique). Aerial LiDAR was collected as at a minimum point density of 24 points per meter, while simultaneous image acquisition provided digital photography to support 3” color orthophotography and planimetric mapping.
Using a blend of the acquired LiDAR and orthoimagery, in-depth classification and extraction was performed on the dense datasets. Project requirements included an absolute accuracy of +/-0.5’ with over 60 different features classes and planimetric layers. While unique to transmission line projects, the density of the data and the ability to extract features such as guy wires, pole tops, and attachment points displays HALIS’ specialized ability to produce high accuracy and highly complex mapping projects from a LiDAR and imagery blended solution.
The deliverables for this project include all required feature codes within a PLS-CADD Model, classified LAS files, 3” orthoimagery, and 2D CADD planimetrics following Southern Company aerial LiDAR and AutoCAD drawing specifications, and related reports.