Method for calculating grid size range when vector line is converted into grid line according to angle error
A technology of angle error and size range, which is applied in the field of grid size range when vector lines are converted into grid lines based on angle error calculation, can solve problems such as inability to calculate angle errors, and grid size selection without scientific basis, etc., to ensure Effects of Correctness and Reliability
Active Publication Date: 2021-06-04
FUZHOU UNIVERSITY
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] One of the purposes of the present invention is to overcome the above disadvantages and provide a method for calculating the grid size range when the vector line is converted into a grid line according to the angle error, so as to solve the problem of the selection of the grid size when the existing vector line is rasterized. Scientific basis, the problem that the angle error cannot be calculated
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
[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0030] like image 3 As shown, it is a flow chart of the method for calculating the grid size range when vector lines are converted to grid lines according to the angle error of the present invention, including the following steps:
[0031] Step 1. According to the vector line to be rasterized, construct the mathematical expectation E[α] of the angle α between the grid line and the horizontal line, where α is an angle less than or equal to a right angle.
[0032] ...
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 relates to the technical field of geographic information, in particular to a method for calculating a grid size range when a vector line is converted into a grid line according to an angle error. According to a vector line to be rasterized, a mathematical expectation E [alpha] of an included angle alpha between a grid line and a horizontal line is constructed, a plurality of different grid size values are selected, a mathematical expectation value of alpha corresponding to each grid size t and an angle error value beta are calculated, and a corresponding relation table of t and beta is obtained; and according to an angle error range allowed by a user and the corresponding relation table of t and beta, finding out a t value range according with an angle error range condition as a determined grid size range. According to the technical scheme of the invention, the problem that the generated angle error cannot be calculated in advance due to the fact that no scientific basis is provided for the selection of the grid size during the existing vector line rasterization can be solved.
Description
technical field [0001] The invention belongs to the field of geographic information systems, and in particular relates to a method for calculating the grid size range when vector lines are converted into grid lines according to angle errors. Background technique [0002] Vector data and raster data are commonly used data formats in GIS, and the rasterization of vector data is also one of the basic operations commonly used in geographic information systems. Covered raster cells, which are widely used in vector data conversion to raster data, map labeling, spatial topology analysis, and grid retrieval. [0003] However, the rasterization of vector data, especially the rasterization of vector lines, is a lossy conversion process. No matter how the conversion accuracy is improved, certain angle errors will occur, such as figure 1 As shown, the length of the vector line CD to be converted is l, and the right angle between CD and the horizontal line is less than or equal to θ (0≤...
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 IPC IPC(8): G06T17/20G06T17/05G06F16/29
CPCG06T17/05G06T17/205G06F16/29
Inventor 陈楠周千千陈韵
Owner FUZHOU UNIVERSITY