Abstract
A quadtree-like representation for storing gridded elevation data is described. The data structure is a pyramid with each node containing two bits of data. The root of the pyramid has associated with it the minimum elevation for the corresponding grid and the maximum variance (the difference between the minimum and maximum values). The elevation value at any pixel is calculated by traversing a path from the root to the pixel, refining the local elevation value during the decent by interpreting the two bit codes stored with each node along the path. Since the total number of nodes in the pyramid is 4/3 the number of pixels required for the bottom level of the pyramid, the amortized storage cost is less than 3 bits per pixel, regardless of vertical resolution.This scheme is most appropriate for efficient secondary storage archival, such as on a CD-ROM. It allows efficient retrieval of complete elevation data from any sub-region, at multiple scales, within the entire elevation database. This is a lossless encoding when the difference between sibling pixels is not “too great”.
This work was partially supported by General Dynamics and by the Virginia Center for Innovative Technology.
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© 1990 Springer-Verlag Berlin Heidelberg
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Shaffer, C.A. (1990). A full resolution elevation representation requiring three bits per pixel. In: Buchmann, A.P., Günther, O., Smith, T.R., Wang, YF. (eds) Design and Implementation of Large Spatial Databases. SSD 1989. Lecture Notes in Computer Science, vol 409. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-52208-5_21
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