CN104952085A - Method for calculating coordination degree of water depth note and bent position of isobath - Google Patents

Method for calculating coordination degree of water depth note and bent position of isobath Download PDF

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Publication number
CN104952085A
CN104952085A CN201510408710.2A CN201510408710A CN104952085A CN 104952085 A CN104952085 A CN 104952085A CN 201510408710 A CN201510408710 A CN 201510408710A CN 104952085 A CN104952085 A CN 104952085A
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sea
point
depth
bottom contour
water
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CN104952085B (en
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张立华
贾帅东
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PLA Dalian Naval Academy
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/40—Analysis of texture
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30181—Earth observation

Abstract

The invention discloses a method for calculating the coordination degree of a water depth note and a bent position of an isobath. The method comprises steps as follows: reading plane positions of all nodes in the certain isobath on a sea chart, and finding out and marking a bending extreme point of the certain bent position in the isobath; reading a plane position of a certain water depth point used for calculating the coordination degree together with the bent position; judging whether the note of the water depth point interrupts the isobath or not; calculating the distance between the water depth point and the bending extreme point; taking the marked bending extreme point as an interruption point, dividing the isobath into two parts, and calculating shortest distances between the water depth point and the two parts of the isobath respectively; calculating the coordination degree of the water depth note and the bent position of the isobath according to the values, and controlling the value variation of the coordination degree to range from 0 to 1 through normalization processing to facilitate analysis and evaluation. Compared with traditional empirical analysis methods, the method has the advantage that the coordination degree of the water depth note and the bent position of the isobath can be calculated quantitatively.

Description

The degrees of coordination computing method in a kind of depth of water annotation and sea-bottom contour knee
Technical field
The present invention relates to marine charting field, particularly relate to the degrees of coordination computing method in a kind of depth of water annotation and sea-bottom contour knee.
Background technology
Dark annotation and sea-bottom contour are key elements sea chart being used for reflect seafloor topography.Depth of water annotation and sea-bottom contour are very important key elements on sea chart, and its quality height will directly have influence on the accuracy of submarine topography expression.
In order to rationally give expression to the fluctuations of submarine topography, when the depth of water is chosen, except will noting the cardinal rule that the depth of water is chosen, be also noted that the depth of water chosen as far as possible and can reflect sea-bottom contour contour shape, that is, near the knee of sea-bottom contour tendency generation significant change, the corresponding depth of water should be selected (as in Fig. 1 as far as possible the shown depth of water), make depth of water annotation can change mutually harmonious with the tendency of sea-bottom contour, complement one another, the phenomenon of contradiction each other can not be occurred.In addition, the depth of water annotation distance sea-bottom contour chosen also should not be too near, avoids interrupting sea-bottom contour too much (as in Fig. 2 as far as possible the shown depth of water), to strengthen the aesthetic property of map sheet.
But in long-term practice, how to judge whether depth of water annotation on sea chart and these two key elements of sea-bottom contour really accomplish harmonious, drawing assignment person only can be relied on according to the drawing experience of self, undertaken one by the mode of artificial visual interpretation to analyze qualitatively, not yet have documents and materials openly can the quality evaluation index of qualitative assessment depth of water annotation and sea-bottom contour harmony and method.
Summary of the invention
In order to overcome the problems referred to above that Conventional wisdom analytical approach exists, the invention provides the degrees of coordination computing method of a kind of sounding and sea-bottom contour.
The technical scheme that the present invention is adopted for achieving the above object is: the degrees of coordination computing method of a kind of sounding and sea-bottom contour, comprise the following steps:
A, input the planimetric position of whole node on certain sea-bottom contour;
B, find and identify the planimetric position of the bending extreme point in certain knee on sea-bottom contour;
C, input are used for one piece, knee therewith and calculate the planimetric position of certain depth of water point of degrees of coordination;
D, judge whether the annotation of this depth of water point has interrupted sea-bottom contour;
E, calculate the plan range of this depth of water point to bending extreme point;
F, with bending extreme point for breakpoint, (Part I is that sea-bottom contour is from starting point to the part of bending extreme point sea-bottom contour to be divided into two parts, Part II is that sea-bottom contour is from bending extreme point to the part of terminal), calculate depth of water point respectively to this two-part bee-line;
G, calculate the degrees of coordination in depth of water point and sea-bottom contour knee.
Described in above-mentioned steps f: with bending extreme point for breakpoint, sea-bottom contour is divided into two parts, and calculating depth of water point to the method for this two-part bee-line is respectively: set depth of water point as v, sea-bottom contour is l, bending extreme point is q, and two parts that sea-bottom contour is divided into are respectively l 1, l 2article two, broken line, wherein l 1be one by the node p on sea-bottom contour 1, p 2..., p k, the broken line that is connected in turn of q.First, calculate depth of water point minute and be clipped to each line segment p 1p 2, p 2p 3..., p k-1p k, p kbee-line d (v, the p of q 1p 2), d (v, p 2p 3) ..., d (v, p k-1p k), d (v, p kq).To calculate depth of water point v to line segment p 1p 2bee-line d (v, p 1p 2) be example, first ask for a v to line segment p 1p 2the intersection point v ' of place straight line, then judges whether intersection point v ' is positioned at line segment p 1p 2two-end-point p 1, p 2between, if so, then calculate the distance of v to v ', as a v to line segment p 1p 2bee-line, namely otherwise, then calculate v and divide and be clipped to p 1, p 2distance, the minimum value of getting the two as a v to line segment p 1p 2bee-line, namely d ( v , p 1 p 2 ) = m i n ( ( x v - x p 1 ) 2 + ( y v - y p 1 ) 2 , ( x v - x p 2 ) 2 + ( y v - y p 2 ) 2 ) ; Then d (v, p is got 1p 2), d (v, p 2p 3) ..., d (v, p k-1p k), d (v, p kq) minimum value in, as depth of water point v to l 1bee-line d (v, l 1).In like manner, depth of water point v is calculated to broken line l 2bee-line d (v, l 2).
Described in above-mentioned steps g, the computing formula of degrees of coordination is:
w ( v , q ) = 1 2 ( γ + 1 1 + ( d ( v , q ) - d b e s t ) 2 + ( d ( v , l 1 ) - d ( p , l 2 ) ) 2 ) × 100 %
In formula, w (v, q) represents degrees of coordination, and γ is according to steps d determination numerical value, if depth of water annotation interrupts sea-bottom contour, then γ=0, otherwise, then γ=1, d (v, q) represent the plan range of depth of water point to bending extreme point, determine numerical value according to step e, d (v, l 1), d (v, l 2) represent that depth of water point minute is clipped to the two-part bee-line of sea-bottom contour, determine numerical value according to step f, d bestrepresent the most coordination distance in sea-bottom contour knee.
Beneficial effect: a kind of sounding proposed by the invention and the degrees of coordination computing method of sea-bottom contour overcome the low inferior deficiency of inaccurate and operating efficiency that traditional empirical analysis method may cause, has made the depth of water annotation on sea chart and these two key elements of sea-bottom contour really accomplish harmonious; And this method can calculate the degrees of coordination in depth of water annotation and sea-bottom contour knee quantitatively.
Accompanying drawing explanation
Fig. 1 reflects in background technology of the present invention that the depth of water of sea-bottom contour contour shape chooses schematic diagram;
Fig. 2 is the schematic diagram that in background technology of the present invention, depth of water annotation interrupts sea-bottom contour;
Fig. 3 is the main flow block diagram of the degrees of coordination calculating depth of water annotation and sea-bottom contour in the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
Implementation procedure of the invention process is that the degrees of coordination adopting computing machine to realize sounding and sea-bottom contour calculates.Suppose the depth of water point v had in chart generalization region on certain sea-bottom contour l and this sea-bottom contour near certain knee, adopt the inventive method to calculate the degrees of coordination in depth of water point and sea-bottom contour knee, comprise the following steps (as shown in Figure 3):
Step a, reads in whole node p on sea-bottom contour l 1, p 2..., p mplanimetric position ( x p i , y p i ) ( i = 1 , 2 , ... , m ) ;
Step b, find and mark the bending extreme point q in certain knee on sea-bottom contour l, planimetric position is (x q, y q);
Step c, reads in the planimetric position (x of certain depth of water point v calculating degrees of coordination for one piece, knee therewith v, y v);
Steps d, judges whether the annotation of this depth of water point v interrupts sea-bottom contour l on figure, if interrupt, then remembers γ=0, otherwise, then remember γ=1;
Step e, calculates the distance of depth of water point v to bending extreme point q
Step f, with bending extreme point q for breakpoint, is divided into l by sea-bottom contour l 1, l 2article two, broken line, calculates depth of water point v respectively to broken line l 1, l 2bee-line d (v, l 1), d (v, l 2).Here, depth of water point v is calculated to broken line l 1(l 1by a p 1, p 2..., p k, the broken line that is connected in turn of q) the method for bee-line be:
1. calculate depth of water point and within v minute, be clipped to each line segment p 1p 2, p 2p 3..., p k-1p k, p kbee-line d (v, the p of q 1p 2), d (v, p 2p 3) ..., d (v, p k-1p k), d (v, p kq).To calculate depth of water point v to line segment p 1p 2bee-line d (v, p 1p 2) be example, first ask for v to line segment p 1p 2the intersection point v ' of place straight line, then judges whether intersection point v ' is positioned at line segment p 1p 2two-end-point p 1, p 2between, if so, then calculate the distance of depth of water point v to intersection point v ', as depth of water point v to line segment p 1p 2bee-line, namely otherwise, then calculate depth of water point and be clipped to a p in v minute 1, p 2distance, the minimum value of getting the two as depth of water point v to line segment p 1p 2bee-line, namely d ( v , p 1 p 2 ) = m i n ( ( x v - x p 1 ) 2 + ( y v - y p 1 ) 2 , ( x v - x p 2 ) 2 + ( y v - y p 2 ) 2 ) ; 2. d (v, p is got 1p 2), d (v, p 2p 3) ..., d (v, p k-1p k), d (v, p kq) minimum value in, as depth of water point v to l 1bee-line d (v, l 1).In like manner, depth of water point v to l is calculated 2bee-line d (v, l 2).
Step g, by calculate γ, d (v, q), d (v, l 1) and d (v, l 2) numerical value substitution degrees of coordination formula, calculate the degrees of coordination w (v, q) in depth of water point and sea-bottom contour knee.Here, the computing method of degrees of coordination are:
w ( v , q ) = 1 2 ( γ + 1 1 + ( d ( v , q ) - d b e s t ) 2 + ( d ( v , l 1 ) - d ( p , l 2 ) ) 2 ) × 100 %
In formula, d bestrepresent the most coordination distance in sea-bottom contour knee, a general setting empirical value, as schemed upper 0.4cm.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.

Claims (3)

1. the degrees of coordination computing method in depth of water annotation and sea-bottom contour knee, is characterized in that, comprise the following steps:
A, input the planimetric position of whole node on certain sea-bottom contour;
B, find and identify the planimetric position of the bending extreme point in certain knee on sea-bottom contour;
C, input are used for one piece, knee therewith and calculate the planimetric position of certain depth of water point of degrees of coordination;
D, judge whether the annotation of this depth of water point has interrupted sea-bottom contour;
E, calculate the plan range of this depth of water point to bending extreme point;
F, with bending extreme point for breakpoint, sea-bottom contour is divided into two parts: a part for sea-bottom contour from starting point to the part of bending extreme point, another part is that sea-bottom contour is from bending extreme point to the part of terminal; Calculate depth of water point respectively to this two-part bee-line;
G, calculate the degrees of coordination in depth of water point and sea-bottom contour knee.
2. the degrees of coordination computing method in a kind of depth of water annotation according to claim 1 and sea-bottom contour knee, it is characterized in that, described in step f: with bending extreme point for breakpoint, sea-bottom contour is divided into two parts, calculating depth of water point to the method for this two-part bee-line is respectively: set depth of water point as v, sea-bottom contour is l, and bending extreme point is q, and two parts that sea-bottom contour is divided into are respectively l 1, l 2article two, broken line, wherein l 1be one by the node p on sea-bottom contour 1, p 2..., p k, the broken line that is connected in turn of q.First, calculate depth of water point minute and be clipped to each line segment p 1p 2, p 2p 3..., p k-1p k, p kbee-line d (v, the p of q 1p 2), d (v, p 2p 3) ..., d (v, p k-1p k), d (v, p kq).To calculate depth of water point v to line segment p 1p 2bee-line d (v, p 1p 2) be example, first ask for a v to line segment p 1p 2the intersection point v ' of place straight line, then judges whether intersection point v ' is positioned at line segment p 1p 2two-end-point p 1, p 2between, if so, then calculate the distance of v to v ', as a v to line segment p 1p 2bee-line, namely otherwise, then calculate v and divide and be clipped to p 1, p 2distance, the minimum value of getting the two as a v to line segment p 1p 2bee-line, namely d ( v , p 1 p 2 ) = min ( ( x v - x p 1 ) 2 + ( y v - y p 1 ) 2 , ( x v - x p 2 ) 2 + ( y v - y p 2 ) 2 ) ; Then d (v, p is got 1p 2), d (v, p 2p 3) ..., d (v, p k-1p k), d (v, p kq) minimum value in, as depth of water point v to l 1bee-line d (v, l 1).In like manner, depth of water point v is calculated to broken line l 2bee-line d (v, l 2).
3. the degrees of coordination computing method in a kind of depth of water annotation according to claim 1 and sea-bottom contour knee, is characterized in that: the computing formula of degrees of coordination described in step g is:
w ( v , q ) = 1 2 ( γ + 1 1 + ( d ( v , q ) - d b e s t ) 2 + ( d ( v , l 1 ) - d ( p , l 2 ) ) 2 ) × 100 %
In formula, w (v, q) represents degrees of coordination, and γ is according to steps d determination numerical value, if depth of water annotation interrupts sea-bottom contour, then γ=0, otherwise, then γ=1, d (v, q) represent the plan range of depth of water point to bending extreme point, determine numerical value according to step e, d (v, l 1), d (v, l 2) represent that depth of water point minute is clipped to the two-part bee-line of sea-bottom contour, determine numerical value according to step f, d bestrepresent the most coordination distance in sea-bottom contour knee, a general setting empirical value, can obtain by adding up.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108681561A (en) * 2018-04-20 2018-10-19 贾帅东 A kind of appraisal procedure of nautical chart isobath flatness
CN108681561B (en) * 2018-04-20 2021-10-19 中国人民解放军海军大连舰艇学院 Method for evaluating deep line smoothness of navigation chart and the like
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