CN103425856A - Method of automatic generation of river terrain according to river cross section data - Google Patents

Abstract

The invention discloses a method of automatic generation of river terrain according to river cross section data. The method includes that logic sections are increased through interpolation based on channel section measurement data artificially acquired, vertical lines are added along the direction of a river so as to subject the whole river to grid transformation, and automatic generation of the river terrain can be realized. By the method, working load in conventional artificial measurement of the river terrain is greatly reduced, so that the working efficiency of river terrain production can be improved and cost can be saved.

Description

A kind of method that automatically generates river topography according to the river survey profile data

Technical field

The present invention relates to a kind of river topography generation method, more specifically, the present invention is a kind of method that automatically generates river topography according to the river cross-section data.

Background technology

Along with the development of digitizing technique, people need faster, more convenient river topography generation method.Yet obtain the method for river topography in the past by on-the-spot actual survey, exist the problem that financial cost is high, manufacturing speed is slow.How under cost-saving, as to improve landform production efficiency prerequisite, to make and to produce river topography, be the problem that is worth thinking.

Summary of the invention

The object of the present invention is to provide a kind of river topography automatic generation method, the method is basis according to the river cross-section data of having measured, and in computing machine, by interpolation algorithm, automatically generates the terrain grid data in river course, minimizing personnel field acquisition cost, improve river topography and obtain efficiency.

The technical solution used in the present invention is as follows:

The first step: using the vector edges boundary line in river course as the bounds of river topography;

Second step: will measure Fixed Sections data (comprising positional information longitude and latitude and the elevation) digitizing that obtains river course, and start as first Fixed Sections from the starting point in river course;

The 3rd step: add the logic section by Spline Interpolation Method between every two Fixed Sections, section is spaced apart 10 meters;

The 4th step: the direction along river course is added vertical line, and logic section, Fixed Sections and vertical line form graticule mesh;

The 5th step: according to river course Fixed Sections measurement data, adopt golden interpolation algorithm in gram that the grid points interpolation in every two Fixed Sections is gone out to height value, give the intersection point (comprising longitude and latitude and height) of graticule mesh;

The 6th step: finally full section is all formed to graticule mesh, the intersection point of each graticule mesh comprises positional information (longitude and latitude and height).

The 7th step: generate river course graticule mesh terrain data.

The accompanying drawing explanation

Fig. 1 utilizes Fixed Sections, obtains the process of logic section.

Fig. 2 is the process that generates the river topography graticule mesh.

Embodiment

For making above-mentioned purpose of the present invention, feature and advantage can be more clear and easy to understand, below in conjunction with accompanying drawing, the specific embodiment of the present invention done to more detailed explanation.

Ji canal, the Tianjin river topography generative process of take is example.At first Ji canal vector data is loaded, determine the river course scope.Then by river course Fixed Sections Data Digital, as shown in Figure 1, perpendicular to river course.From the starting point in river course, start as first Fixed Sections (naming method: 0+000).Between two Fixed Sections, by interpolating method, add the logic section, spacing is 10 meters.Run into the corner, river can increase section (naming method: 1+000,2+000 ...).Add vertical line along the direction in river again, form graticule mesh, realize full section is all formed to graticule mesh, as shown in Figure 2.By the Fixed Sections data, can calculate the positional information (longitude and latitude) of the intersection point of each graticule mesh.With golden interpolation algorithm in gram, the grid points interpolation in every two Fixed Sections is gone out to height value again.Now, the intersection point of graticule mesh comprises position and elevation information (longitude and latitude, highly).Finally by all, generated general river topography data file after the Grid square of the upper height value of tax.

The present invention take the part measure profile data as the basis, by interpolation and gridding, obtain rapidly the river topography data, greatly reduced the original artificial workload that gathers river topography, improve the efficiency that river topography is produced, thereby promoted the development of river course digitized business.

Embodiment herein is only exemplary, does not comprise all embodiment.Those skilled in the art can, under the application and claims, make various modifications and corrigendum.

Claims (2)

1. a method that automatically generates river topography according to the river survey profile data, its feature mainly comprises following:

--the vector edges boundary line in river course is used for determining the scope in river course;

--the Fixed Sections in river course produces according to measurement data;

--the logic section in river course obtains by interpolation between two adjacent Fixed Sections;

--the river vertical line, along the river direction, draw;

--terrain mesh, the Fixed Sections in river course, logic section intersect and form with the river vertical line.

2. a kind of method that automatically generates river topography according to the river survey profile data claimed in claim 1 is characterized in that:

The first step: using the vector edges boundary line in river course as the bounds of river topography;

Second step: will measure Fixed Sections data (comprising positional information longitude and latitude and the elevation) digitizing that obtains river course, and start as first Fixed Sections from the starting point in river course;

The 3rd step: add the logic section by Spline Interpolation Method between every two Fixed Sections, section is spaced apart 10 meters;

The 4th step: the direction along river course is added vertical line, and logic section, Fixed Sections and vertical line form graticule mesh;

The 5th step: according to river course Fixed Sections measurement data, adopt golden interpolation algorithm in gram that the grid points interpolation in every two Fixed Sections is gone out to height value, give the intersection point (comprising longitude and latitude and height) of graticule mesh;

The 6th step: finally full section is all formed to graticule mesh, the intersection point of each graticule mesh comprises positional information (longitude and latitude and height).

The 7th step: generate river course graticule mesh terrain data.

Images