Fine evaluation method for distribution rationality of nautical chart water depth annotations
A technology of rationality and water depth, applied in image data processing, 2D image generation, instruments, etc., can solve the problem of evaluating the rationality of the distribution of water depth annotations on sea charts, etc.
Pending Publication Date: 2022-01-04
PLA DALIAN NAVAL ACADEMY
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, some breakthroughs have been made in the quality assessment of sounding annotations in terms of navigation safety assurance and navigation resource expression. However, in terms of whether the distribution on the map is reasonable, it mainly depends on the way of manual visual interpretation by chart cartographers Carrying out a qualitative empirical analysis, there is no public literature that can quantitatively evaluate the rationality of the distribution of depth annotations on charts
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0037] The present invention will be further described below in conjunction with the accompanying drawings and technical solutions.
[0038] The implementation process of the present invention is to use a computer to realize the fine evaluation of the rationality of the distribution of the water depth annotations on the sea chart. Assume that for a certain chart to be evaluated, the method of the present invention is used to evaluate the rationality of the distribution of depth annotations on the chart, including the following steps (such as figure 1 shown):
[0039] Step a, read the coordinates (x i ,y i ) and the depth value z i (i=1,2,...,m), and use the point-by-point insertion method to establish Delaunay water depth triangulation;
[0040] Step b. Select a sounding point i as the current sounding point, and extract and establish the adjacent sounding point set S of the current sounding point according to the established Delaunay sounding triangulation network i , de...
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
Login to View More Abstract
The invention provides a fine evaluation method for distribution rationality of nautical chart water depth annotations, and belongs to the field of marine surveying and mapping. The method comprises the following steps: reading all water depth points on a sea chart to be evaluated, and establishing a Delaunay water depth triangulation network by using a point-by-point insertion method; estimating the average spacing of each water depth point on the sea chart by calculating the on-chart plane distance between each water depth point and the adjacent water depth point; deducing and establishing a corresponding relation between a depth value of a water depth annotation and a reference interval according to specific requirements on water depth density in China Navigation Chart Compligation Specification; and according to the depth value, the average spacing and the reference spacing of each water depth point on the sea chart to be evaluated, judging the note distribution rationality of each water depth point on the sea chart.
Description
technical field [0001] The invention belongs to the field of marine surveying and mapping, and in particular relates to a method for finely evaluating the rationality of the distribution of water depth annotations on sea charts. Background technique [0002] Water depth, as a basic element reflecting the ups and downs of the seabed topography on the nautical chart, plays a very important role in ensuring the safety of ships' navigation at sea and reflecting the navigability of waterways. [0003] The quality of water depth notation on nautical charts is usually comprehensively considered from three aspects: navigation safety assurance, navigation resource expression, and whether the distribution on the chart is reasonable. At present, some breakthroughs have been made in the quality assessment of sounding annotations in terms of navigation safety assurance and navigation resource expression. However, in terms of whether the distribution on the map is reasonable, it mainly de...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/20
CPCG06T11/206
Inventor 贾帅东张立华董箭
Owner PLA DALIAN NAVAL ACADEMY