CN103258348A - Dynamic visualization method of island reefs based on tidal process - Google Patents
Dynamic visualization method of island reefs based on tidal process Download PDFInfo
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- CN103258348A CN103258348A CN2013101322578A CN201310132257A CN103258348A CN 103258348 A CN103258348 A CN 103258348A CN 2013101322578 A CN2013101322578 A CN 2013101322578A CN 201310132257 A CN201310132257 A CN 201310132257A CN 103258348 A CN103258348 A CN 103258348A
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Abstract
A dynamic visualization method of island reefs based on the tidal process is characterized in that according to an area and a time domain set by a user, data such as terrain and the depth of water in a corresponding area are extracted from fundamental geographical information database, the DEM of the area is obtained or generated, time series of tide height absolute elevation in a certain period are generated according to a tidal table of the area and the time domain, exposing forms of the island reefs with different heights of tide are respectively extracted from the DEM and are combined according to the time series, and exposing situations of the island reefs with different tide levels are shown dynamically.
Description
Technical field
The invention belongs to Yu Haiyang map making field, particularly a kind of island reef dynamic and visual method based on tidal level.
Technical background
All kinds of island in the ocean, particularly coral reef class island are subjected to the influence of oceanic tide, and the form of the exposure water surface and area have very big difference under different tidal level, some in addition flood and all or part of exposing of time of low water wholly or in part at high water time.And existing ocean map visualization method, the map visualization method that particularly relates to island or reef, do not consider the influence of oceanic tide fully, can not represent the spatial-temporal characteristics of islands and reefs clearly, there is following problem in existing island reef method for visualizing:
(1) visual expression is too summarized, and is accurate inadequately
Present ocean map is many to be represented the general boundary of coral reef to rest on the level of generalized representation, owing to less than with reference to morning and evening tides, can not express accurately the dew form that goes out of coral reef with simple symbol more.
(2) have only static the displaying, do not embody the influence of morning and evening tides process
Morning and evening tides is a kind of version the most common in the ocean, its things to ocean or coastal zone has significantly and significant effects, because it has different conditions constantly in difference, be difficult to be described with static map mode, present ocean map only shows that the islands and reefs of the static state of a certain tidal level go out the dew form, and can not show other tidal level, or the islands and reefs of each tidal level go out the dew form in the whole morning and evening tides process.
Summary of the invention
Technology of the present invention is dealt with problems and is: a kind of island reef dynamic and visual method based on the morning and evening tides process is provided, purpose is to solve existing ocean map visualization method to the problem of the deficiency of dynamic morning and evening tides process displaying, raising island reef form is illustrated in the precision on time and the space, shows the variation that the island reef goes out the dew form in the morning and evening tides process with dynamical fashion.
Technical scheme of the present invention is: according to zone and the time domain of user's setting, data such as the landform of extraction corresponding region, the depth of water from basic geographic information database, obtain or generate this regional DEM, generate the tidal height absolute elevation time series of certain hour section according to the tidal table of this zone and time domain, the island reef that extracts each tidal height then from the DEM respectively goes out the dew form, and merge by the time sequence, the plunge into the commercial sea exposure regimen condition of islands and reefs of the different tidal level of Dynamic Display, the specific implementation step is as follows:
(1) from the GIS database, travels through and extracts benchmark landform and reference water depth data in this zone according to the geographic area of setting, described data are regular grid DEM(digital elevation model, it is the finite sequence of the tri-vector of expression ground table section landform, be generally the finite aggregate of elevation on the ground table unit, can be expressed as z=f (x, y)), if be the isoline data, need to generate DEM(isoline generation DEM and can use current isoline interpolation method), be used for step (3) and extract dynamic 0 meter level line;
(2) according to the geographic area of setting and time scope from the tidal data storehouse in the query region website (tidal datum refers to calculate the face of starting at of tidal height at the tidal height time series of this time interval and tidal datum, this starts at the difference in height of face and elevation datum to be used herein to expression), the tidal height time series is tide-prediction curve or tide record curve, and be scaled the absolute elevation value of different tidal heights, computing formula is:
Tidal height absolute elevation (H)=tidal height (h)+tidal datum (B)
And on the DEM basis in step (1), obtain dynamic 0 meter level line by step (3);
(3) from the DEM that step (1) is chosen, adopt the graticule mesh linear interpolation, according to the different tidal height absolute elevation level lines constantly of the tidal height absolute elevation formulas Extraction in the step (2), and with cubic spline interpolation the level line that extracts in the above-mentioned steps is carried out slyness and handle, go out the dew form with what this represented these moment islands and reefs;
(4) islands and reefs under the different tidal heights that get access to are gone out the dew form and splice with the time axis from step (3), generate the time series of islands and reefs form under each tidal height.
The present invention's advantage compared with prior art is:
(1) user can generate the motion graphics of special time scope in the selection area alternately by zone and the time domain of selecting;
(2) influence of consideration time and morning and evening tides can more accurate representation island reef exposure regimen condition at a time;
(3) variation of island reef exposure water state in the Dynamic Display morning and evening tides process more intuitively.
Description of drawings
Fig. 1 is method realization flow figure of the present invention;
Fig. 2 is islands and reefs DEM schematic three dimensional views of the present invention;
Fig. 3 is marigram figure of the present invention;
Fig. 4 is that islands and reefs go out the dew synoptic diagram under the different tidal height of the present invention;
Fig. 5 is surface chart as a result of the present invention.
Embodiment
As shown in Figure 1, the embodiment of the inventive method is as follows:
(1) utilize level line, vertical control point and sea-bottom contour, depth of water point to make up DEM;
A) bathymetric data (sea-bottom contour, depth of water point) is got negative value and handle, be about to water depth value by just changeing negative, generate the absolute altitude height value;
B) utilize the altitude figures in land and seabed, use current isoline interpolation algorithm, generate DEM;
(2) zone of choosing according to the user utilizes the landform extraction module, searches for, chooses the DEM of corresponding region in basic geographic information database, be example at this with Central-South key island, the Nansha Islands, Nan Yaodao is located in 114 ° of 25'25 " E, 10 ° of 40'04 " N is illustrated in figure 2 as southern key island DEM three-dimensional display;
(3) zone and the time domain of choosing according to the user utilized the morning and evening tides enquiry module, searches for, chooses the tidal height time series of the corresponding time domain of corresponding region morning and evening tides website in the tidal data storehouse;
A) if in the selection area morning and evening tides website is arranged, then use this station data;
B) if in the selection area a plurality of morning and evening tides websites are arranged, then get a plurality of website mean values;
C) if do not have the morning and evening tides website in the selection area, then enlarge the hunting zone, up to a website nearest apart from this zone, and use its data.
Search key island, south, Nansha on March 20th, 2013 tidal data at this, because Nan Yaodao does not have website, therefore the tidal data of nearest corresponding time of Shuangzi reef station of the chosen distance Nan Yaodao of system is illustrated in figure 3 as the Shuangzi reef tide-prediction curve on March 20th, 2013;
(4) by following formula, calculate the absolute elevation value of the tidal height in a certain moment:
Tidal height absolute elevation (H)=tidal height (h)+tidal datum (B)
Adopt the graticule mesh linear interpolation, extract the level line of this height value from DEM, and with cubic spline interpolation the level line that extracts is carried out slyness and handle, as the islands and reefs exposure water boundaries of this moment tidal height.Shown in Fig. 4 (a) and (b), (c), be respectively and go out the dew form at climax, slack tide, time of low water Nan Yaodao;
Wherein, described graticule mesh linear interpolation, be the level line computing method of using always, it directly obtains contour point in the enterprising line linearity interpolation in DEM graticule mesh limit, follow the trail of whole contour points according to certain rule in a certain direction again, at last these contour points are connected successively, form level line, its step is as follows:
A. according to the data value of the data computation grid points of discrete point;
B. interpolation contour point on the graticule mesh border;
C. follow the trail of contour point, and form some contour point sequences of a certain elevation, connect contour point and carry out curve plotting, obtain level line;
Described cubic spline interpolation is a smooth curve by a series of shape value points, realizes by finding the solution cubic spline functions on the mathematics.
Suppose that going up given one at interval [a, b] cuts apart Δ: a=x
0＜x
1＜...＜x
n=b, the function S (x) on [a, b] is called cubic spline functions, if satisfy following condition:
A. at each minizone [x
I-1, x
i] (i=1,2 ..., n) interior S (x) is respectively the cubic polynomial function;
B. at node x
i(i=1,2 ..., n-1) locate to set up: S
(k)(x
i-0)=S
(k)(x
i-0), k=0,1,2, i.e. cubic polynomial function on the minizone is at the x of splice point place
iHas the Second Order Continuous splicing.
C. satisfy interpolation condition y
i=S (x
i), i=1,2 ..., n.
(5) with the islands and reefs exposure water boundaries of middle each moment tidal height that generates of step (4), make up according to time sequencing, the dynamic islands and reefs form that forms in the seclected time of the territory is showed sequence;
(6) with the Dynamic Display sequence that generates in the step (5), show the user by display module, as shown in Figure 5, be southern key island tidal fluctuations display interface and result, the user can conveniently check that the tidal height of a certain time of tide and the islands and reefs of this moment go out the dew form, also can play sequence in the animation mode simultaneously, the Dynamic Display islands and reefs go out the variation of dew form.
The part that the present invention does not elaborate belongs to techniques well known.
Although above the illustrative embodiment of the present invention is described; so that the technician of present technique neck understands the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are apparent, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (1)
1. island reef dynamic and visual method based on the morning and evening tides process, it is characterized in that: according to zone and the time domain of user's setting, data such as the landform of extraction corresponding region, the depth of water from basic geographic information database, obtain or generate this regional DEM, generate the tidal height absolute elevation time series of certain hour section according to the tidal table of this zone and time domain, the island reef that extracts each tidal height then from the DEM respectively goes out the dew form, and merge by the time sequence, the plunge into the commercial sea exposure regimen condition of islands and reefs of the different tidal level of Dynamic Display, the specific implementation step is as follows:
(1) travel through and extract benchmark landform and reference water depth data in this zone according to the geographic area of setting from the GIS database, described data are regular grid DEM, if be the isoline data, and need generation DEM;
(2) according to the geographic area of setting and time scope from the tidal data storehouse in the query region website at tidal height time series and the tidal datum of this time interval, the tidal height time series is tide-prediction curve or tide record curve, and be scaled the absolute elevation value of different tidal heights, computing formula is:
Tidal height absolute elevation (H)=tidal height (h)+tidal datum (B)
(3) from the DEM that step (1) is chosen, adopt the graticule mesh linear interpolation, according to the different tidal height absolute elevation level lines constantly of the tidal height absolute elevation formulas Extraction in the step (2), and with cubic spline interpolation the level line that extracts in the above-mentioned steps is carried out slyness and handle, go out the dew form with what this represented these moment islands and reefs;
(4) islands and reefs under the different tidal heights that get access to are gone out the dew form and splice with the time axis from step (3), generate the time series of islands and reefs form under each tidal height.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108460146A (en) * | 2018-03-20 | 2018-08-28 | 武汉光庭信息技术股份有限公司 | A kind of capacity method for reducing of map display data |
| CN108469255A (en) * | 2018-02-25 | 2018-08-31 | 长江空间信息技术工程有限公司(武汉) | A kind of river and lake history water level amount calculation method |
| CN110334137A (en) * | 2019-07-15 | 2019-10-15 | 兰州交通大学 | A kind of sea island reef metamorphosis quantitative description extracting method based on tide process |
| CN111275819A (en) * | 2019-12-18 | 2020-06-12 | 自然资源部国土卫星遥感应用中心 | Application method of global elevation reference model of remote sensing satellite |
| CN113326470A (en) * | 2021-04-11 | 2021-08-31 | 桂林理工大学 | Remote sensing water depth inversion tidal height correction method |
| CN115222909A (en) * | 2022-09-19 | 2022-10-21 | 深圳市湾测技术有限公司 | Three-dimensional image detection model construction method |
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| CN102693355A (en) * | 2012-03-22 | 2012-09-26 | 国家海洋局第一海洋研究所 | High-precision water level calculation technology for rare tide station data control |
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Patent Citations (1)
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| CN102693355A (en) * | 2012-03-22 | 2012-09-26 | 国家海洋局第一海洋研究所 | High-precision water level calculation technology for rare tide station data control |
Non-Patent Citations (2)
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| 张坚梁等: "《海岛礁成图编绘系统的研究与实现》", 《海洋地质前沿》, vol. 27, no. 10, 31 October 2011 (2011-10-31), pages 64 - 70 * |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469255A (en) * | 2018-02-25 | 2018-08-31 | 长江空间信息技术工程有限公司(武汉) | A kind of river and lake history water level amount calculation method |
| CN108460146A (en) * | 2018-03-20 | 2018-08-28 | 武汉光庭信息技术股份有限公司 | A kind of capacity method for reducing of map display data |
| CN108460146B (en) * | 2018-03-20 | 2021-09-14 | 武汉光庭信息技术股份有限公司 | Capacity reduction method for map display data |
| CN110334137A (en) * | 2019-07-15 | 2019-10-15 | 兰州交通大学 | A kind of sea island reef metamorphosis quantitative description extracting method based on tide process |
| CN111275819A (en) * | 2019-12-18 | 2020-06-12 | 自然资源部国土卫星遥感应用中心 | Application method of global elevation reference model of remote sensing satellite |
| CN111275819B (en) * | 2019-12-18 | 2023-05-16 | 自然资源部国土卫星遥感应用中心 | Application method of global elevation reference model of remote sensing satellite |
| CN113326470A (en) * | 2021-04-11 | 2021-08-31 | 桂林理工大学 | Remote sensing water depth inversion tidal height correction method |
| CN113326470B (en) * | 2021-04-11 | 2022-08-16 | 桂林理工大学 | Remote sensing water depth inversion tidal height correction method |
| CN115222909A (en) * | 2022-09-19 | 2022-10-21 | 深圳市湾测技术有限公司 | Three-dimensional image detection model construction method |
| CN115222909B (en) * | 2022-09-19 | 2022-11-29 | 深圳市湾测技术有限公司 | Three-dimensional image detection model construction method |
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