Method for improving display effect of three-dimensional digital earth platform

The invention discloses a three-dimensional terrain data compression method with an ultrahigh compression ratio, which comprises the following steps: S1, terrain tile segmentation: projecting global terrain data according to longitude and latitude, and dividing the global terrain data into two root...

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Bibliographic Details
Main Authors PENG SHAOMING, HE LIUPENG, WANG JUNLIANG, WANG YU, CHENG JI, ZHANG NAN
Format Patent
LanguageChinese
English
Published 31.01.2020
Subjects
CALCULATING
COMPUTING
COUNTING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
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Summary:The invention discloses a three-dimensional terrain data compression method with an ultrahigh compression ratio, which comprises the following steps: S1, terrain tile segmentation: projecting global terrain data according to longitude and latitude, and dividing the global terrain data into two root nodes, namely an east hemisphere and a west hemisphere; S2, calculating an offset value: each childnode comprises 513 * 513 elevation points, and in order to compress the data volume, firstly calculating the offset value of each elevation point; S3, encoding and storing the offset values: taking the minimum value and the maximum value of the offset values of all elevation points of the child node, and calculating the encoding of each offset value by using a formula to obtain an encoding value Bof one byte; and S4, carrying out Huffman coding compression on the stored data. The three-dimensional terrain data compression method has the advantages that the coordinates of each elevation pointare directly determined acc
Bibliography:Application Number: CN201911012668