CN111259527B - Inundation analysis method based on GIS system, intelligent terminal and storage medium - Google Patents

Inundation analysis method based on GIS system, intelligent terminal and storage medium Download PDF

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CN111259527B
CN111259527B CN202010026818.6A CN202010026818A CN111259527B CN 111259527 B CN111259527 B CN 111259527B CN 202010026818 A CN202010026818 A CN 202010026818A CN 111259527 B CN111259527 B CN 111259527B
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gis system
submerged
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simulation
gis
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CN111259527A (en
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郭博阳
吴闽华
姜坤
卫宣安
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Shenzhen Genew Technologies Co Ltd
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Abstract

The invention discloses a flooding analysis method based on a GIS system, an intelligent terminal and a storage medium, wherein the method comprises the following steps: the method comprises the steps of obtaining topographic data of a pre-analysis area, and loading the topographic data to a GIS system; acquiring a designated analysis area, and forming the analysis area into a surrounding type; setting final height and speed of the GIS system for simulation, and displaying the change process of the analysis area and the submerged area; the rising speed and the final height of the water flow in the simulation process are changed, and the basis of decisions required by the disaster situation is obtained through analysis and estimated. The invention uses graphics technology to visualize the terrain simulation as a model, the submerged water flow simulation as a contour geometrical body, the submerged speed is set as the variation of the water flow simulation, and the variables are used to comprehensively deduce the submerged process and result of the water flow simulation in high-precision terrain.

Description

Inundation analysis method based on GIS system, intelligent terminal and storage medium
Technical Field
The present invention relates to the field of computer applications, and in particular, to a flooding analysis method based on a GIS system, an intelligent terminal, and a storage medium.
Background
GIS (Geographic Information System or Geo-Information system, geographic information system) is a special and very important spatial information system, which is a technical system for collecting, storing, managing, calculating, analyzing, displaying and describing related geographic distribution data in the whole or part of the earth surface (including the atmosphere) space under the support of computer hardware and software systems. GIS is a computer-based tool that can analyze and process spatial information (in short, to map and analyze phenomena and events occurring on earth). GIS technology integrates the unique visual effects and geographic analysis functions of maps with general database operations (e.g., queries and statistical analysis, etc.).
In reality, geological disasters are often fatal and unexpected, so that some pre-warning and disaster pre-analysis methods are valuable, but in the prior art, a method for calculating inundation analysis data of a region and obtaining reliable and visual analysis data is very difficult and consumes manpower and material resources, is quite unintuitive, is difficult to show inundation change process, and is difficult to be used as direct reference materials.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
The invention mainly aims to provide a submerged analysis method based on a GIS system, an intelligent terminal and a storage medium, and aims to solve the defects in the prior art.
In order to achieve the above object, the present invention provides a method for analyzing flooding based on a GIS system, the method for analyzing flooding based on a GIS system comprising the steps of:
the method comprises the steps of obtaining topographic data of a pre-analysis area, and loading the topographic data to a GIS system;
acquiring a designated analysis area, and forming the analysis area into a surrounding type;
setting final height and speed of the GIS system for simulation, and displaying the change process of the analysis area and the submerged area;
the rising speed and the final height of the water flow in the simulation process are changed, and the basis of decisions required by the disaster situation is obtained through analysis and estimated.
Optionally, the method for analyzing flooding based on a GIS system, wherein the loading the topographic data to the GIS system specifically includes:
and converting the topographic data into topographic data in a loadable format through topographic data software, and overlaying and loading the topographic data into the GIS system.
Optionally, in the flooding analysis method based on the GIS system, the terrain data is in tif format or dem format.
Optionally, in the flooding analysis method based on the GIS system, the surrounding type is a primitive in the GIS system.
Optionally, the method for analyzing flooding based on the GIS system, wherein the surrounding type includes a polygon.
Optionally, in the flooding analysis method based on the GIS system, the basis of the decision required by the disaster situation includes:
the disaster should evacuate masses and property in which areas, transfer to which areas not to be submerged, put in which areas in advance drainage points and drainage facilities should be put at the end point, and predict which areas can be submerged after how long according to the speed of increasing water quantity when the disaster occurs.
In addition, to achieve the above object, the present invention further provides an intelligent terminal, where the intelligent terminal includes: the device comprises a memory, a processor and a GIS-based flooding analysis program stored on the memory and capable of running on the processor, wherein the GIS-based flooding analysis program realizes the steps of the GIS-based flooding analysis method when being executed by the processor.
In addition, in order to achieve the above object, the present invention also provides a storage medium storing a GIS system-based flooding analysis program that, when executed by a processor, implements the steps of the GIS system-based flooding analysis method described above.
The method comprises the steps of loading topographic data of a pre-analysis area to a GIS system by acquiring the topographic data; acquiring a designated analysis area, and forming the analysis area into a surrounding type; setting final height and speed of the GIS system for simulation, and displaying the change process of the analysis area and the submerged area; the rising speed and the final height of the water flow in the simulation process are changed, and the basis of decisions required by the disaster situation is obtained through analysis and estimated. The invention uses graphics technology to visualize the terrain simulation as a model, the submerged water flow simulation as a contour geometrical body, the submerged speed is set as the variation of the water flow simulation, and the variables are used to comprehensively deduce the submerged process and result of the water flow simulation in high-precision terrain.
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FIG. 1 is a flow chart of a preferred embodiment of a GIS-based flooding analysis method of the present invention;
FIG. 2 is a schematic diagram of a surrounding polygon formed by analysis areas in a preferred embodiment of a GIS-based flooding analysis method of the present invention;
FIG. 3 is a schematic diagram of a preferred embodiment of a GIS-based flooding analysis method of the present invention, in which primitives are already located in the analysis area of the attached terrain;
FIG. 4 is a schematic diagram showing the effect of 3500 m height in a preferred embodiment of a GIS-based flooding analysis method of the present invention;
FIG. 5 is a schematic diagram showing the 90 degree effect of 4500 meter height in top view in a preferred embodiment of the GIS-based flooding analysis method of the present invention;
FIG. 6 is a schematic diagram showing 45 degree effect of 4500 meter height in top view in a preferred embodiment of a GIS-based flooding analysis method of the present invention;
FIG. 7 is a schematic diagram of an operating environment of a smart terminal according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
According to the flooding analysis method based on the GIS system, as shown in FIG. 1, the flooding analysis method based on the GIS system comprises the following steps:
and step S10, obtaining the topographic data of the pre-analysis area, and loading the topographic data to a GIS system.
Specifically, the GIS system is used for loading the topographic data of the pre-analysis area, for example, the GIS system used in the invention is Cesium js, a global open source GIS system, and the loading of the topographic data of each precision of each area in the world is supported.
The specific terrain data can be ultra-high precision terrain produced by satellites, the more accurate the result obtained by the analysis of the terrain data with higher precision is, and the specific loading method is to convert the terrain data (the terrain data products are generally in tif or dem formats and are supported by the tif or dem formats) into the Cesium js loadable terrain data in a terrain format through a piece of software for processing the Cesium js terrain data in a domestic matching way. The coverage is loaded into a GIS system, and the specific loaded codes are as follows:
Figure BDA0002362764770000051
step S20, acquiring a designated analysis area, and forming the analysis area into a surrounding type.
Specifically, an analysis area is specified, and the analysis area is abstracted into a surrounding type (a polygon surrounded by geographical coordinates, for example, an array consisting of 4 longitude and latitude coordinate points:
[94.58524032406419,29.786717871065793,
94.55616047700616,29.447812368678015,
95.14870816756388,29.536967300507705,
95.03307451731162,29.90611385597023])
the surrounding is visualized as primitive Polygon (primitive is basic figure, basic figure supported by the system includes Polygon) in a GIS system as shown in fig. 2.
And step S30, setting the final height and the final speed of the GIS system for simulation, and displaying the change process of the analysis area and the submerged area.
Specifically, the primitive is already located in the analysis area of the attached terrain, at this time, the characteristic that the primitive Polygon has the characteristic of being capable of changing the height and the characteristic that the water flow keeps the same liquid level height in a diffuse time delay on any terrain is utilized, the height is set to be 0, the primitive is temporarily covered by the terrain, and a place higher than the terrain is displayed.
Setting the final height of the simulation, setting the speed of the simulation, and observing the change process of the simulation, wherein the method accurately adopts the correct perspective relationship when calculating the relationship between the water fluid and the topography, and the effect is 3500 m height as shown in fig. 3; a top view 90 degree effect of 4500 meters height is shown in fig. 4; the 45 degree effect is seen in the top view of a height of 4500 meters as shown in fig. 5.
As shown in fig. 6, the distance observation effect can be achieved, which areas are submerged first and last, can be clearly observed, and can be played back and forth, and the playback is performed for a plurality of times.
And S40, changing the rising speed and the final height of the water flow in the simulation process, analyzing to obtain the basis of decisions required by the disaster situation, and estimating.
Specifically, the rising speed and the final height of the water flow are continuously changed, the prediction possibly caused by the occurrence of the disaster is simulated, and the data are analyzed and applied to decision making. For example, the people and property in which areas should be evacuated by the disaster, the areas not submerged are shifted, the advanced drainage points and drainage facilities should be thrown in which areas by the end point, and the areas can be submerged after estimated for a long time according to the increasing speed of the water quantity when the disaster occurs.
In the flooding analysis as a comprehensive analysis, the factors such as topographic data, precipitation data, time factors, flooding speed and the like are involved, and the GIS system is very suitable as an analysis tool.
The invention utilizes a set of inundation analysis methods developed by data such as terrain, time, speed and the like in a GIS system, utilizes graphic algorithm to calculate, can directly visually observe inundation process and result, and supports playback. The method comprises the steps of loading all information of terrain data, submerged speed, submerged height and the like into a GIS system, visualizing terrain simulation into a model by using a graphics technology, visualizing submerged water flow simulation into a contour geometrical body, setting the submerged speed as the variable quantity of the water flow simulation body, and comprehensively deducing the submerged process and result of the water flow simulation body in high-precision terrain by using the variable quantity.
Further, as shown in fig. 7, based on the above-mentioned flooding analysis method based on the GIS system, the present invention further provides an intelligent terminal, which includes a processor 10, a memory 20 and a display 30. Fig. 7 shows only some of the components of the intelligent terminal, but it should be understood that not all of the illustrated components are required to be implemented, and more or fewer components may alternatively be implemented.
The memory 20 may in some embodiments be an internal storage unit of the smart terminal, such as a hard disk or a memory of the smart terminal. The memory 20 may also be an external storage device of the Smart terminal in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like. Further, the memory 20 may also include both an internal storage unit and an external storage device of the smart terminal. The memory 20 is used for storing application software installed in the intelligent terminal and various data, such as program codes for installing the intelligent terminal. The memory 20 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the memory 20 has stored thereon a GIS-system-based flooding analysis program 40, and the GIS-system-based flooding analysis program 40 is executable by the processor 10 to implement the GIS-system-based flooding analysis method of the present application.
The processor 10 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 20, for example performing the GIS-based flooding analysis method, etc.
The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like in some embodiments. The display 30 is used for displaying information on the intelligent terminal and for displaying a visual user interface. The components 10-30 of the intelligent terminal communicate with each other via a system bus.
In one embodiment, the processor 10, when executing the GIS system based flooding analysis program 40 in the memory 20, performs the following steps:
the method comprises the steps of obtaining topographic data of a pre-analysis area, and loading the topographic data to a GIS system;
acquiring a designated analysis area, and forming the analysis area into a surrounding type;
setting final height and speed of the GIS system for simulation, and displaying the change process of the analysis area and the submerged area;
the rising speed and the final height of the water flow in the simulation process are changed, and the basis of decisions required by the disaster situation is obtained through analysis and estimated.
The loading the topographic data into the GIS system specifically comprises:
and converting the topographic data into topographic data in a loadable format through topographic data software, and overlaying and loading the topographic data into the GIS system.
The topographic data is in tif format or dem format.
The surrounding type is the graphic element in the GIS system.
The enclosure comprises a polygon.
The decision basis for disaster situations comprises the following steps:
the disaster should evacuate masses and property in which areas, transfer to which areas not to be submerged, put in which areas in advance drainage points and drainage facilities should be put at the end point, and predict which areas can be submerged after how long according to the speed of increasing water quantity when the disaster occurs.
The invention also provides a storage medium, wherein the storage medium stores a flooding analysis program based on a GIS system, and the flooding analysis program based on the GIS system realizes the steps of the flooding analysis method based on the GIS system when being executed by a processor.
In summary, the invention provides a flooding analysis method based on a GIS system, an intelligent terminal and a storage medium, wherein the method comprises the following steps: the method comprises the steps of obtaining topographic data of a pre-analysis area, and loading the topographic data to a GIS system; acquiring a designated analysis area, and forming the analysis area into a surrounding type; setting final height and speed of the GIS system for simulation, and displaying the change process of the analysis area and the submerged area; the rising speed and the final height of the water flow in the simulation process are changed, and the basis of decisions required by the disaster situation is obtained through analysis and estimated. The invention uses graphics technology to visualize the terrain simulation as a model, the submerged water flow simulation as a contour geometrical body, the submerged speed is set as the variation of the water flow simulation, and the variables are used to comprehensively deduce the submerged process and result of the water flow simulation in high-precision terrain.
Of course, those skilled in the art will appreciate that implementing all or part of the above-described methods may be implemented by a computer program for instructing relevant hardware (such as a processor, a controller, etc.), where the program may be stored in a computer-readable storage medium, and where the program may include the steps of the above-described method embodiments when executed. The storage medium may be a memory, a magnetic disk, an optical disk, or the like.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims (6)

1. The flooding analysis method based on the GIS system is characterized by comprising the following steps of:
the method comprises the steps of obtaining topographic data of a pre-analysis area, and loading the topographic data to a GIS system;
the loading the topographic data into the GIS system specifically comprises:
converting the topographic data into topographic data in a loadable format through topographic data software, and overlaying and loading the topographic data into the GIS system;
acquiring a designated analysis area, and forming the analysis area into a surrounding type;
setting final height and speed of the GIS system for simulation, and displaying the change process of the analysis area and the submerged area;
changing the rising speed and the final height of water flow in the simulation process, analyzing to obtain the basis of decision required by the disaster situation and estimating;
the decision basis for disaster situations comprises the following steps:
the disaster should evacuate masses and property of which areas, transfer to which areas not to be submerged, focus on which areas to which advanced drainage points and drainage facilities should be placed, and predict which areas can be submerged after how long according to the speed of increasing water quantity when the disaster occurs;
calculating by using a graphic algorithm, directly visually observing the flooding process and the result, and supporting playback; the method comprises the steps of loading all terrain data, submerged speed and submerged height into a GIS system, visualizing terrain simulation into a model by using a graphics technology, visualizing submerged water flow simulation into a contour geometrical body, setting the submerged speed as the variable quantity of the water flow simulation body, and comprehensively deducing the submerged process and result of the water flow simulation body in high-precision terrain by using the variable quantity.
2. The method of claim 1, wherein the terrain data is in tif format or dem format.
3. The method of claim 1, wherein the enclosure is a primitive within the GIS system.
4. A GIS-based flooding analysis method according to claim 3, characterized in that the surrounding comprises a polygon.
5. An intelligent terminal, characterized in that, the intelligent terminal includes: a memory, a processor and a GIS system based flooding analysis program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the GIS system based flooding analysis method according to any one of claims 1-4.
6. A storage medium storing a GIS system based flooding analysis program which, when executed by a processor, implements the steps of the GIS system based flooding analysis method according to any one of claims 1-4.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101630366A (en) * 2009-07-31 2010-01-20 中国科学院地理科学与资源研究所 Method for extracting dynamic inundated area of large numbers of block topographic data, device and system thereof
CN103256914A (en) * 2012-12-27 2013-08-21 北京地拓科技发展有限公司 Method and system for calculating inundated areas of warp land dam based on DEM

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102426672B (en) * 2011-07-29 2015-01-14 广西电网公司电力科学研究院 Flood inundation analysis and early warning system for power transmission facilities
CN102902893B (en) * 2012-10-29 2015-03-11 南京信息工程大学 Method for calculating rainfall ponding depth of catchment area based on DEM (digital elevation model)
CN104898183B (en) * 2015-05-29 2017-10-17 杭州辰青和业科技有限公司 Heavy rain urban waterlogging modelling evaluation method
CN106599080B (en) * 2016-11-22 2019-09-24 河海大学 A kind of rapid generation for keeping away big vast transfer figure based on GIS

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101630366A (en) * 2009-07-31 2010-01-20 中国科学院地理科学与资源研究所 Method for extracting dynamic inundated area of large numbers of block topographic data, device and system thereof
CN103256914A (en) * 2012-12-27 2013-08-21 北京地拓科技发展有限公司 Method and system for calculating inundated areas of warp land dam based on DEM

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