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Dimensional raster data generation and cut algorithm

Author: ZhaoCan
Tutor: ChenXueGong
School: Central South University
Course: Computer Science and Technology
Keywords: Raster data Inverse distance weighting algorithm Cropped domain search Clustering effect Cutaway display
CLC: P208
Type: Master's thesis
Year: 2009
Downloads: 112
Quote: 2
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Abstract


In the three-dimensional geographic information system (GIS) , the three-dimensional data model to the data structure of the core . From the perspective of data description format division , three-dimensional spatial data model can be summarized as raster data (Raster), vector data (Vector) two kinds . Since raster data can quantify the spatial objects in discrete grid values ??represent , and in three-dimensional space , in the performance of the internal characteristics of space objects have great advantages, such as the mean of expression and non- spatial analysis , so it is spatial information system is one of the important basis . This paper studies the three-dimensional raster data generation algorithm and raster data model represents a cross section display algorithm . This paper presents an improved inverse distance weighted (IDW) algorithm, this algorithm to generate a three-dimensional raster data is closer to the actual situation . The algorithm first preprocessed discrete points , and then use experimental variogram to estimate the correlation length of the data , and then through eighth domain search space domain for each data point to be estimated according to their sort of data points , the final choice every one in the spatial domain to be estimated from the nearest point of N points using ordinary IDW interpolation algorithm . In this algorithm , the experimental variogram can effectively reduce the search distance , while reducing the use of eight domain search \Raster data representation model based on cross-sectional studies show algorithm , this paper proposes a quick search profile voxel grid intersects with cutaway display algorithm to achieve an arbitrary plane and raster voxel phase cut . The algorithm first calculates the outermost cutting plane intersects with the voxel grid , and then the cross-section in accordance with the value of y , in numerical order to the xz plane projection Finally, according determine the mathematical relationship between intervals intersect with all profiles voxel grid . The algorithm reduces the voxel grid and all profiles were judged intersection computation , visualization in scientific computing can be well applied .

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > General issues > Mapping database and information system
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