Chapter4:DataCubeComputation andDataGeneralization EfficientComputationofDataCubes ExplorationandDiscoveryinMultidimensional Databases Attribute-OrientedInduction─AnAlternative DataGeneralizationMethod 2/13/201
We also introduce a cube cell notation that is useful for describing data cube computation methods. 5.1.1 Cube Materialization: Full Cube, Iceberg Cube, Closed Cube, and Cube Shell Figure 5.1 shows a 3-D data cube for the dimensions A, B, and C, and an aggregate measure, M. Commonly ...
An overview of data warehouse implementation examines general strategies for efficient data cube computation, OLAP data indexing, and OLAP query processing. Finally, data generalization by attribute-oriented induction is studied. This method uses concept hierarchies to generalize data to multiple levels of...
Applications need the N -dimensional generalization of these operators. This paper defines that operator, called the data cube or simply cube. The cube operator generalizes the histogram, cross- tabulation, roll-up, drill-down, and sub-total constructs found in most report writers. The novelty ...
GraphData[name] gives a graph with the specified name. GraphData[entity] gives the graph corresponding to the graph entity. GraphData[entity, property] gives the value of the property for the specified graph entity. GraphData[class] gives a list of avail
2. Datasets and Preprocessing 2.1. Landsat Imagery and Datacube More than 7000 Landsat OLI images covering China and acquired in 2015 were downloaded from the USGS (United States Geological Survey) and RADI (Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences). These images...
Data cube aggregationinvolves summarizing or aggregating the data along multiple dimensions, such as time, location, product, and so on. This can help reduce the complexity and size of the data, as well as reveal higher-level patterns and trends. ...
generalizationandspecializationcanbeperformedonadatacubebyroll-upanddrill-downthisisnotanapproachforconceptdescription,onlyfordatageneralization Limitations:mostcommercialdatacubeimplementationsconfinethetypesofdimensionstosimplenonnumericdataandofmeasurestosimpleaggregatednumericvalues concepthierarchiescanbeautomaticallygenerated...
Chapter 4 Data Cube Computation and Data Generalization 157 4.1 Efficient Methods for Data Cube Computation 157 4.1.1 A Road Map for the Materialization of Different Kinds of Cubes 158 4.1.2 Multiway Array Aggregation for Full Cube Computation 164 4.1.3 BUC: Computing Iceberg Cubes from the...
It is well known that seismic data (or seismic volumes/images) are one of the primary work materials of the oil and gas industry. Nevertheless, the manual