Optimization of laser scanning data storage into ESRI Geodatabase
JEDLIČKA, K. Optimization of laser scanning data storage into ESRI Geodatabase. Ostrava, 2012.
|Anglický název:||Optimization of laser scanning data storage into ESRI Geodatabase|
|Autoři:||Ing. Karel Jedlička PhD. ,|
|Abstrakt EN:||Nowadays, the whole territory of the Czech Republic is scanned by LIDAR and a digital elevation model of fifth generation is prepared for store the data. The model is based on a structure of irregular triangular network and will store very detailed data – 0.3 meter height accuracy ČÚZK (2011). Therefore there will become a need to store and efficiently manage very large volumes of triangles. This situation is analogous to raster data storage and management, where overview pyramids are often used for faster accessing the data. Although there exist many methods of building overview pyramids on triangular networks (see their summary e.g. in Feciskanin (2011), the paper focuses directly on widely used data format ESRI Geodatabase, particularly the terrain dataset structure, and its two methods of creating pyramids (z-tolerance and window size). The aim of the paper is to test these available methods of pyramids creation and suggest a methodology for creating suitable overview pyramids, while the following characteristics have been taken into account during setting parameters of particular pyramids: - Typical morphology of the area of interest (cultural, geologically stable long-term landscape shaped by erosion). - Phenomenon, which is represented by data (digital terrain model or digital surface model). - Accuracy of the raw data (very detailed data). - Common scales used for viewing data. All created overview pyramids are compared to source data and evaluated using a volume base criterion.|