Unlock instant, AI-driven research and patent intelligence for your innovation.

A Quantitative Evaluation Method for the Comprehensive Quality of Area Feature Maps

A quantitative evaluation and quality evaluation technology, applied in geographic information databases, instruments, calculations, etc., can solve problems such as automatic quality evaluation that has a large impact and cannot be integrated by maps, and achieves the effect of automation

Inactive Publication Date: 2019-12-17
CHINA UNIV OF GEOSCIENCES (WUHAN)
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the qualitative evaluation of map synthesis quality cannot be directly quantified as data that can be directly processed by the computer, and the qualitative evaluation results are greatly affected by subjective factors, so it is impossible to automatically evaluate the quality of map synthesis

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Quantitative Evaluation Method for the Comprehensive Quality of Area Feature Maps
  • A Quantitative Evaluation Method for the Comprehensive Quality of Area Feature Maps
  • A Quantitative Evaluation Method for the Comprehensive Quality of Area Feature Maps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Refer to attached figure 1 , an embodiment of the present invention provides a method for quantitatively evaluating the comprehensive quality of areal feature maps, comprising the following steps:

[0048] (1) Determine the operators of area feature map synthesis as selection, simplification, dimensionality reduction and merging;

[0049] (2) Extraction of feature points and calculation of distance vectors before synthesis of areal feature maps;

[0050] (3) Extraction of feature points and calculation of distance vectors of the planar feature map according to the synthesis of the above operators;

[0051] (4) Substituting the distance vectors in steps (2) and (3) into the cosine similarity calculation formula respectively, and obtaining the similarity results of selection, simplification, dimensionality reduction and merging respectively;

[0052] (5) Calculate the number of elements in the four cases of selection, simplification, dimensionality reduction and merging...

Embodiment 2

[0099] Evaluate the quality of areal feature map synthesis in an area.

[0100] Refer to attached Figures 14 to 17 In the experiment, the area feature data of 1:5000 in a certain area was used as the data source. First, the tools such as merging, aggregation, simplification, and building simplification of the map synthesis toolkit in ArcGIS were used. By setting the "simplification threshold T" and the "minimum Area M” and other constraints are used to synthesize data sources, and a map with a scale of 1:10000 after synthesis is obtained through parameter settings.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The embodiment of the invention provides a quantitative evaluation method of the face shape element map comprehensive quality. The method comprises the steps of using a calculation method of cosine similarity to calculate the similarity of selected, simplified, dimension-reduced and merged operator conditions according to a comprehensive front face shape element map and a comprehensive rear face shape element map provided by a user, and dividing a comprehensive quality evaluation result of a comprehensive operator by an operator element sum so that a quantitative evaluation result of the face shape element map comprehensive quality can be obtained. In all the computing progresses, the data is substituted into a formula to be calculated, then a computer can be utilized to directly conduct quantitative calculation, the evaluation result is automatically obtained, the purpose of automating a face shape element map comprehensive progress is achieved, and the user can be assisted in choosing an optimal comprehensive scheme.

Description

technical field [0001] The invention relates to the technical field of map drawing, in particular to a method for quantitatively evaluating the comprehensive quality of areal element maps. Background technique [0002] The purpose of map synthesis is to express as much geographic information as possible in the map area when the scale of the map is reduced and the number of features and geomorphological symbols on the map is reduced. According to the geometric characteristics of map symbols, map elements can be divided into three types: point, line, and surface, and there are many algorithms for map elements. In related technologies, the algorithm for map elements expounds the basic idea of ​​the algorithm, program flow, time and space efficiency, etc., and qualitatively evaluates the comprehensive quality of the map. [0003] However, the qualitative evaluation of map synthesis quality cannot be directly quantified as data that can be directly processed by a computer. The q...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/29G06K9/62
CPCG16Z99/00
Inventor 杨乃胡伟路田玉刚陈诗漪晁怡苏黎兰郑贵洲奚大平吕建军
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)