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Method for dividing and encoding different lunar basic scale topographic maps

A scale and topographic map technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not having a larger scale, achieve shared publishing, reduce storage space, and reduce geometric deformation. Effect

Inactive Publication Date: 2011-01-12
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Map framing is related to the technical level of data acquisition, map production and use requirements. At present, there is no larger scale framing scheme or method in foreign countries

Method used

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  • Method for dividing and encoding different lunar basic scale topographic maps
  • Method for dividing and encoding different lunar basic scale topographic maps
  • Method for dividing and encoding different lunar basic scale topographic maps

Examples

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example 1

[0086] Example 1: If the longitude of a point is 114°33′45″ and the latitude is 39°22′30″, calculate the number of the map frame where it is located.

[0087] Calculate its row and column numbers according to formulas (1) and (2):

[0088] (character code E);

[0089] Find that the longitude difference corresponding to the fifth row is 20°, that is, Δλ=20°;

[0090] b=[(λ+180) / Δλ]+1=[(114°33′45″+180°) / 20°]+1=015;

[0091] The sheet number of the 1:2 500 000 topographic map where this point is located is E015;

[0092] 1:1 000 000 frame number:

[0093] a=5 b=15 Δλ=20° Δλ'=10°

[0094]

[0095]

[0096]

[0097] d=[(180+λ-(b-1)Δλ) / Δλ']+1

[0098] =[(180+114°33′45″-(15-1)20°) / 10°]+1

[0099] =002

[0100] Therefore, the 1:1 000 000 topographic map number is E015A002002;

[0101] 1:500 000 frame number:

[0102] a=5 b=15 Δλ=20° Δλ'=5°

[0103]

[0104]

[0105]

[0106] d=[(180+λ-(b-1)Δλ) / Δλ']+1

[0107] =[(180+114°33′45″-(15-1)20°) / 5°]+1

[...

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Abstract

The invention discloses a method for dividing and encoding different lunar basic scale topographic maps by using longitude and latitude. In the method, the entire moon is divided into 14 latitudinal bands, wherein the division and encoding with basic scale of 1:2,500,000 is realized in each latitudinal band by using fixed longitude difference and altitude difference; the division and the encoding of the topographic map with the scale of 1:10,000-1:1,000,000 are subdivided based on the division and the encoding of the topographic map with the scale of 1:2,500,000; and thus the different lunar basic scale topographic maps are divided and encoded by using the longitude and latitude. By the method, the geometric deformation of each division is little so as to contribute to expression, reading and quantitative calculation of topographic elements and geomorphologic elements; the storage space of the data after the division is reduced so as to contribute to sharing and publishing of topographic data and convenient data management and application; and thus the method can be applied to making a lunar map and related thematic maps and processing, managing, sharing and using the data.

Description

technical field [0001] The invention relates to the field of lunar and planetary science and technology, and relates to a method for framing and coding topographic maps of different basic scales of the moon by using latitude and longitude. Background technique [0002] Since the 1950s, foreign countries have successively launched a variety of probes to detect the topography of the moon, obtained a wealth of data, and produced a large number of topographic maps of the moon. The lunar exploration project carried out by China is listed as one of the sixteen major projects in the "National Medium and Long-Term Science and Technology Development Plan (2006-2020)". The third milestone. In July 2008, the Chang'e-1 satellite completed the whole moon image mapping. On September 20, 2009, China completed the full moon digital orthophoto and terrain data with the highest accuracy, the most complete coverage and the richest texture information. The above data provide a wealth of infor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 牟伶俐李春来刘建军任鑫
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI