Automated feature extraction for 3-dimensional point clouds
| Autor: | Alexander A. Soderlund, Jessica Baer, Bradley Clymer, Lori A. Magruder, Amy L. Neuenschwander, Holly W. Leigh |
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| Rok vydání: | 2016 |
| Předmět: |
Ground truth
Computer science Feature extraction Elevation Point cloud Terrain 02 engineering and technology Image segmentation 01 natural sciences 010309 optics Lidar 0103 physical sciences 0202 electrical engineering electronic engineering information engineering 020201 artificial intelligence & image processing Spatial analysis Remote sensing |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| Popis: | Light detection and ranging (LIDAR) technology offers the capability to rapidly capture high-resolution, 3-dimensional surface data with centimeter-level accuracy for a large variety of applications. Due to the foliage-penetrating properties of LIDAR systems, these geospatial data sets can detect ground surfaces beneath trees, enabling the production of highfidelity bare earth elevation models. Precise characterization of the ground surface allows for identification of terrain and non-terrain points within the point cloud, and facilitates further discernment between natural and man-made objects based solely on structural aspects and relative neighboring parameterizations. A framework is presented here for automated extraction of natural and man-made features that does not rely on coincident ortho-imagery or point RGB attributes. The TEXAS (Terrain EXtraction And Segmentation) algorithm is used first to generate a bare earth surface from a lidar survey, which is then used to classify points as terrain or non-terrain. Further classifications are assigned at the point level by leveraging local spatial information. Similarly classed points are then clustered together into regions to identify individual features. Descriptions of the spatial attributes of each region are generated, resulting in the identification of individual tree locations, forest extents, building footprints, and 3-dimensional building shapes, among others. Results of the fully-automated feature extraction algorithm are then compared to ground truth to assess completeness and accuracy of the methodology. |
| Databáze: | OpenAIRE |
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