CN101738178B - River fluctuation analysis system and method employing aerial photograph and GIS (Graphical Information System) - Google Patents
River fluctuation analysis system and method employing aerial photograph and GIS (Graphical Information System) Download PDFInfo
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- CN101738178B CN101738178B CN2008101790420A CN200810179042A CN101738178B CN 101738178 B CN101738178 B CN 101738178B CN 2008101790420 A CN2008101790420 A CN 2008101790420A CN 200810179042 A CN200810179042 A CN 200810179042A CN 101738178 B CN101738178 B CN 101738178B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention provides river fluctuation analysis system and method employing aerial photograph and a GIS, which can carry out the mobile comparison of low-water channels easily. The invention comprises an aerial photograph receiving part and a digital map receiving part which are connected with a system driver component and used for receiving aerial photographs and digital maps; an interface part which is used for the data interface between the key input of a user and the system driver component and a CPU (Central Processing Unit) and an RAM (Random Access Memory); a display part which outputs the aerial photographs and the digital maps into images, and outputs the analysis result into images; a database which consists of river plane figure DB and river attribute information DB. The system driver component transforms the resolution and capacity of each data according to received aerial photographs and digital maps, so as to provide coordinate systems to the aerial photographes, separate river regions in each aerial photograph of the area into a plurality of regions, analyze river changes and relize control in the way of driving warning when identifying changing ranges.
Description
Technical field
The present invention relates to adopt the plane mutation analysis system and the method thereof in the rivers and creeks of aerophoto and GIS; More particularly, the present invention relates to the plane mutation analysis system and the method thereof in the rivers and creeks of following employing aerophoto and GIS, wherein; Through in the aerophoto per year in object rivers and creeks, setting actual coordinate figure; Photo to low water route and dyke compares per year and automatically, thus, can obtain decision data fast.
Background technology
As well-known, river maintenance of implementing at present and river maintenance be total carrying out under the state of the characteristic that flows of ignoring the rivers and creeks.Consequently; The manual work processing in rivers and creeks is also continuing up till now, thus, although physics, chemistry, the biology in rivers and creeks and river course caused deep effect; Actual situation is; The reason of artificial rivers and creeks disturbance and the influence of rivers and creeks disturbance, that is, establishing of the quantitative assessment technique of deformation of river bed, the intrusion of adventitious species plant and biology, the variation of ecological habitat etc. is very insufficient.In addition; The mitigation technique, recovery technique and the adaptation administrative skill that are used to overcome the rivers and creeks disturbance are not all put in order from system; Rivers and creeks and dam administrative authority are just experiencing difficulty; Thus, in order to overcome such situation, necessarily require to resist the disturbance assessment technique that the recovery management technological development of rivers and creeks disturbance is used.In order to carry out such technological development, the method for analyzing the variation outward appearance in rivers and creeks is necessary, and the variation outward appearance in this rivers and creeks constitutes the basis of grasping the disturbance virtual condition.
But, up till now, in the system of the variation outward appearance of analyzing the rivers and creeks; Obviously there is not analytical approach technology fully, thus, the time that cost is grown very much when the decision-making of the river maintenance of Office of the People's Government and rivers and creeks plan; It like this, has the problem that the decision behavior carelessness is carried out according to being inaccurate.
Summary of the invention
The actual conditions that The present invention be directed to the prior art of above-mentioned that kind propose; The object of the present invention is to provide the plane mutation analysis system and the method thereof in the rivers and creeks that adopts aerophoto and GIS; Wherein, after in the aerophoto per year in object rivers and creeks too, setting the process of actual coordinate figure, according to the aerophoto that is suitable for coordinate system; Construct low water route and dyke data by each year; Thus, can watch plane configuration per year to change, form the several data of the necessary datum line of plane mutation analysis, rivers and creeks center line and the rivers and creeks air line distance datum line etc. in rivers and creeks; Hang down the mobile comparison in water route (river course below the full-water level) like this, easily.
In order to realize the purpose of above-mentioned that kind; The preferred embodiments of the present invention provide a kind of plane mutation analysis system that adopts the rivers and creeks of aerophoto and GIS; It is characterized in that this system comprises with the system drive assembly is connected, and is used to receive the aerophoto acceptance division and the numerical value map acceptance division of aerophoto and numerical value map; Interface portion, it is used for user's key input and system drive assembly and CPU, the data-interface between the RAM; Display part, it outputs to picture with aerophoto and numerical value map, and analysis result is outputed to picture; Database; Its by by the region and the rivers and creeks planar graph DB and the rivers and creeks attribute information DB that preserve to be suitable for the aerophoto data of coordinate figure per year constitute; This rivers and creeks attribute information DB and above-mentioned rivers and creeks planar graph DB link; Preservation is with inferior rivers and creeks information: with the rivers and creeks characteristic information and the positional information of mating by each region and aerophoto per year, the width and the length information of following water route and dyke, datum line information; The system drive assembly; It is according to receiving aerophoto and numerical value map; The resolution of each data of conversion and capacity offer this aerophoto with coordinate system, and the interval, rivers and creeks of each aerophoto of this region is separated into a plurality of intervals; The analysis rivers and creeks changes, and the mode that when the identification constant interval, drives alarm is controlled.
On the other hand, the present invention provides the plane mutation analysis method in the rivers and creeks that adopts aerophoto and GIS, it is characterized in that this method comprises employing aerophoto and numerical value map, makes aerophoto have the 1st process of coordinate system; Aerophoto per year specifically is separated into a plurality of intervals, and automatically input is by the 2nd process of each interval code; Press each interval the 3rd process of movement images automatically; Judge the 4th process that whether exists of constant interval; When having constant interval, automatically drive the 5th process of alarm; Constant interval is outputed to the 6th process of picture; Extract the attribute information and the positional information of this constant interval out, it is outputed to the 7th process of picture.
Plane mutation analysis system and method thereof according to the rivers and creeks of employing aerophoto of the present invention and GIS; Through aerophoto more per year, by module, wriggle change degree, the plane of width of degree, low water route, rivers and creeks and dyke, comparative analysis rivers and creeks changes outward appearance apace per year, like this; Can make a strategic decision fast and the rivers and creeks planning analysis; Through it, can change in the scope inner analysis rivers and creeks of environment, implement the improvement operation in rivers and creeks etc.
Description of drawings
Fig. 1 is the frame assumption diagram of the structure of the plane mutation analysis system in the rivers and creeks of employing aerophoto and the GIS of expression one embodiment of the present of invention;
The frame assumption diagram of the structure of the system drive assembly that comprises in the plane mutation analysis system of Fig. 2 for the rivers and creeks of employing aerophoto and the GIS of expression one embodiment of the present of invention;
Fig. 3 is the plane mutation analysis system in the rivers and creeks of the employing aerophoto of expression through one embodiment of the present of invention and GIS, the aerophoto of employing coordinate system is outputed to the figure of the state of picture;
Fig. 4 (a), the curve map of the sinuous degree in the low water route of (b) analyzing for the plane mutation analysis system in the rivers and creeks of employing aerophoto and the GIS of expression through one embodiment of the present of invention per year;
Fig. 4 (c), the curve map of the sinuous degree of the dyke of (d) analyzing for the plane mutation analysis system in the rivers and creeks of employing aerophoto and the GIS of expression through one embodiment of the present of invention per year;
Fig. 5 (a) (b) is respectively the curve map of the width ratio of low water route that the plane mutation analysis system in the rivers and creeks of the employing aerophoto exported per year through one embodiment of the present of invention and GIS analyzes and dyke;
Fig. 6 (a) and Fig. 6 (b) are the process flow diagram of signal flow of plane mutation analysis system in rivers and creeks of employing aerophoto and the GIS of one embodiment of the present of invention.
Embodiment
With reference to the accompanying drawings, the present invention is specified.
Fig. 1 is the frame assumption diagram of the structure of the plane mutation analysis system in the rivers and creeks of employing aerophoto and the GIS of expression one embodiment of the present of invention, the frame assumption diagram of the structure of the system drive assembly that comprises in the plane mutation analysis system of Fig. 2 for the rivers and creeks of the employing aerophoto of representing one embodiment of the present of invention and GIS.
With reference to these accompanying drawings, the plane mutation analysis system in employing aerophoto of one embodiment of the present of invention and the rivers and creeks of GIS is following system, wherein; After setting the process of actual coordinate figure in the aerophoto per year in object rivers and creeks too; According to the aerophoto that adopts coordinate system, constitute the low water route and the dyke data in each year, thus; Can watch plane configuration per year to change; Various data of the necessary datum line of plane mutation analysis in formation rivers and creeks, rivers and creeks center line, rivers and creeks air line distance datum line etc. thus, are hanged down the mobile comparison in water route easily.
In the plane mutation analysis system in the rivers and creeks of the employing aerophoto of one embodiment of the present of invention and GIS; With central control processor (being called " CPU " below) 50 is the center; Storer (being called " RAM " below) 60, graphic user interface (being called " GUI " below) 80 are electrically connected, and have a plurality of DB70A of the present invention, 70B.In addition; Database 70 is electrically connected with above-mentioned RAM60; According to through interface portion 40, programme with the mode that above-mentioned CPU50 exchanges startup each other and the system drive assembly 30 of the plane mutation analysis system in the rivers and creeks of the employing aerophoto of the present invention that designs and GIS is electrically connected.In the plane mutation analysis system in the rivers and creeks that adopts aerophoto and GIS, formation is connected with said system driven unit 30 respectively, is used to receive the aerophoto acceptance division 10 and numerical value map acceptance division 20 of aerophoto.
At this moment; The plane mutation analysis system in the rivers and creeks of employing aerophoto of the present invention and GIS is characterised in that; Apply and the purchase stage of the numerical value map that uses begins from the aerophoto of object region and coordinate; Aerophoto can carry out the mutation analysis of plane per year in rivers and creeks, is suitable for the problem of the reality of resolution and price etc.The aerophoto of corresponding region can be retrieved at ' the territory spatial image information interconnect services system ' homepage that adopts territory geography information institute, buys after grasping, and the catalogue of the aerophoto that the present invention adopted is shown in (table 1) and (table 2).
The aerophoto catalogue present situation in (table 1) Huang Jiang basin
The aerophoto catalogue present situation in (table 2) Nan Jiang basin
So; Above-mentioned aerophoto acceptance division 10 is from ' territory spatial image information interconnect services system '; Receive the aerophoto data of specific region, above-mentioned numerical value map acceptance division 20 receives the numerical value map datum of specific region from the Office of the People's Government of numerical value map is provided.
Above-mentioned database 70 mainly is divided into rivers and creeks planar graph DB70A and rivers and creeks attribute information DB70B.Above-mentioned rivers and creeks planar graph DB70A is for pressing the region and preserving the DB of the aerophoto data that are suitable for coordinate figure per year; Above-mentioned rivers and creeks attribute information DB70B is connected with above-mentioned rivers and creeks planar graph DB70A, for preserve with by each region with by the DB of the rivers and creeks information of the width of the rivers and creeks characteristic information of each annual aerophoto coupling and positional information, following water route and dyke and length information, datum line information etc.
Said system driven unit 30 is a control gear; It is according to the resolution and the capacity that receive aerophoto and numerical value map, each data of conversion; Coordinate system is offered this aerophoto; The interval, rivers and creeks by aerophoto of this region is separated into a plurality of intervals, and the mode of rivers and creeks variation, driving alarm when the identification constant interval of analyzing is controlled.
Fig. 2 is the figure of the concrete structure of expression said system driven unit 30; With reference to Fig. 2; Said system driven unit 30 comprises photo/map transformations portion, photo/map synchronization process portion, the separating treatment portion between the photo multi-region that quantizes, rivers and creeks mutation analysis portion, alarm generation portion and computing/processing module, and above-mentioned rivers and creeks mutation analysis portion comprises per year sinuous degree analysis portion, rivers and creeks change width analysis portion and plane, rivers and creeks mutation analysis portion.
Above-mentioned photo/map transformations portion 31 is according to the value of having set; To aerophoto and the resolution of numerical value map and the mechanism that capacity changes processing as the large-capacity data that has received; The mechanism of above-mentioned photo/map synchronization process portion 32 for handling according to the mode of in aerophoto, setting coordinate figure; The above-mentioned separating treatment portion between the photo multi-region 33 that quantizes is divided into a plurality of intervals for the interval, rivers and creeks of the aerophoto that will provide coordinate figure, and input automatically is by each interval section (mechanism of code value of コ-ス).
Above-mentioned rivers and creeks mutation analysis portion 34 is for compare above-mentioned aerophoto per year; Through image relatively; The mechanism of judging that whether exists to per-interval rivers and creeks change part; Above-mentioned alarm generation portion 35 drives the mechanism of alarm for when discerning changed interval through above-mentioned rivers and creeks mutation analysis portion 34.
Each structure of setting control of the control program of the aerophoto that above-mentioned computing/processing module 37 is handled for quantizing in advance according to comparative analysis per year; To by the region, carry out computing and analysis by the interval plane changing value in rivers and creeks interval, per year; This assay value is outputed to picture, the mechanism of drive controlling alarm.
The above-mentioned sinuous degree analysis portion 34a that constitutes above-mentioned rivers and creeks mutation analysis portion 34 is for to carrying out computing in the low water route in rivers and creeks and the left side of dyke/right bank length, and the multiplying power of the length through rivers and creeks air line distance datum line is spent the mechanism that carries out computing to wriggling.
Above-mentioned rivers and creeks change width analysis portion 34b is for carrying out the mechanism that computing is analyzed to the low water route in per year rivers and creeks and the width of dyke and the wide ratio of low water route-dyke; Plane, the above-mentioned rivers and creeks 34c of mutation analysis portion for the numeric ratio through adopting above-mentioned sinuous degree analysis portion 34a and above-mentioned rivers and creeks change width analysis portion 34b with plane picture relatively, the mechanism of analysis plane variable condition.
According to accompanying drawing, the function and the effect of the plane mutation analysis system in employing aerophoto of the above-mentioned such one embodiment of the present of invention that constitute of object and the rivers and creeks of GIS specify.
Fig. 3 is the plane mutation analysis system in the rivers and creeks of employing aerophoto and the GIS of expression through one embodiment of the present of invention; The aerophoto that adopts coordinate system is outputed to the figure of the state of picture; Fig. 4 (a); The curve map of the sinuous degree in the low water route of (b) analyzing for the plane mutation analysis system in the rivers and creeks of employing aerophoto and the GIS of expression through one embodiment of the present of invention per year; Fig. 4 (c); The curve map of the sinuous degree of the dyke of (d) analyzing for the plane mutation analysis system in the rivers and creeks of employing aerophoto and the GIS of expression through one embodiment of the present of invention per year; Fig. 5 (a) (b) is respectively the curve map of the width ratio of low water route that the plane mutation analysis system in the rivers and creeks of the employing aerophoto exported per year through one embodiment of the present of invention and GIS analyzes and dyke, and Fig. 6 a and Fig. 6 b are the process flow diagram of the signal flow of the plane mutation analysis system in the rivers and creeks of the employing aerophoto of expression one embodiment of the present of invention and GIS.
At first, the plane mutation analysis system in the rivers and creeks of employing aerophoto of one embodiment of the present of invention and GIS receives aerophoto and numerical value map datum (ST-1,2) through acceptance division; After Data Receiving is accomplished; Through the pre-treatment process (ST-3) of above-mentioned aerophoto and numerical value map datum, still, this pre-treatment process mainly is divided into the automatic conversion process of aerophoto resolution and capacity; With aerophoto and the automatic synchronous processing process of coordinate system (ST-3a, 3b).
When the aerophoto that adopts same as before originally, in the photo that shows about 4～5 year, the occasion of carrying out operation; Continue to upgrade the photo that arrives 600MB, thus, even under the situation that adopts high-performance computer; In operation from now on, meet difficulty; Thus, through when having necessary resolution such as differentiation of low water route and map compensation, be transformed to the process of the resolution of the best that also can consider operating speed.
That is, the photo/map transformations portion 31 of the system drive assembly 30 of the plane mutation analysis system in employing aerophoto through constituting one embodiment of the present of invention and the rivers and creeks of GIS automatically is transformed to resolution and the capacity of having set with aerophoto.
In addition; (ST-3b) adopts the numerical value map and through the aerophoto of conversion process to the automatic synchronous processing process of aerophoto and coordinate system; Carry out real GIS equalization, still, it is for adopting the conventional coordinates of the aerophoto that can be common to the tiff file form; But not in grid data, set the Word file of coordinate figure, for setting the process of actual coordinate figure.
In ESRI ArcMAP, show aerophoto and numerical value map shapes file; Adopt the reference mark; Between the same facility thing, make 2～4 minimum point synchronous; Make through the identical operation of the coordinate of 2 data coordinate synchronously after, the coordinate of setting through ' UpdateGeoreferencing ' upgraded accomplishes.
In order to adopt above-mentioned such aerophoto, the plane of analyzing per year, rivers and creeks changes, and extracts the low water route and the dyke shapes file in object rivers and creeks out, it is characterized in that owing to adopting the GIS data, so analyze easily.
If the pre-treatment process is accomplished; Then in the present invention; Through extracting the process (ST-4) of object ground domain information out; But the main process by low water route of extracting each year out and dyke SHP file of the process (ST-4) of extracting above-mentioned object ground domain information out (ST-4a), with the process (ST-4b) constitute of the rivers and creeks attribute information of extracting subject area out.
In the present invention,, not only extract low water route and dyke data out in order to analyze the rivers and creeks, the data of also extracting datum line, rivers and creeks center line, rivers and creeks air line distance datum line etc. out, still, its data for making according to the river maintenance Basic Planning Document of object region.
Accomplish if information is extracted out, then the present invention is separated into a plurality of intervals of having set with the aerophoto of coordinatograph, automatically imports each interval block information (ST-5).
At this state; Carry out image interval image of (ST-6), each year that kind shown in the image pattern 6b relatively relatively between each year, ((ST-6b) changes visual analysis (ST-6c) constitute with the plane in rivers and creeks per year for ST-6a), per year the change width analysis of low water route, rivers and creeks and dyke by per year sinuous degree analysis.
Promptly; In above-mentioned low water route and dyke shapes file; Calculate the length of a left side-right bank of low water route and dyke, then, in the sinuous degree extraction of the multiplying power of the length of employing rivers and creeks air line distance datum line; Adopt the sinuous degree of a left side-right bank in low water route and the sinuous degree of a left side-right bank of dyke, analyze the sinuous degree present situation in rivers and creeks per year.
In addition, adopt above-mentioned low water route and dyke shapes file and datum line shapes file, calculate low water route and the width of dyke and the width ratio of low water route-dyke in rivers and creeks per year, analyze the plane change shape in rivers and creeks.The coordinate figure of the width computation process employing said reference line data of low water route and dyke and the coordinate figure of low water route and dyke and carry out, still, this process is shown in (table 3).
On the other hand, whether the present invention automatically judges the interval existence of change after analyzing each annual aerophoto, there being the interval occasion of change, drive alarm, and the interval of having changed is outputed to picture.In addition, from above-mentioned rivers and creeks attribute information DB70B, extract the information in the interval of exporting to picture out, it is outputed to picture.Through it, can carry out rivers and creeks change width analysis and decision fast.
(table 3) rivers and creeks change width computation process
On the other hand, the plane mutation analysis system and the method thereof in the employing aerophoto of embodiments of the invention and the rivers and creeks of GIS are not limited to the foregoing description, can in the scope that does not break away from this technology main idea, change according to multiple mode.
Label declaration
Claims (5)
1. plane mutation analysis system that adopts the rivers and creeks of aerophoto and GIS is characterized in that it comprises:
Aerophoto acceptance division and numerical value map acceptance division, interface portion, display part, database, system drive assembly, CPU and RAM;
Said aerophoto acceptance division is connected with the system drive assembly with numerical value map acceptance division, is used to receive aerophoto and numerical value map;
Said interface portion is used for user's key input, and the system drive assembly is formed data-interface respectively and between CPU and the RAM;
Said display part is connected with RAM with CPU respectively through GUI, and it outputs to picture with aerophoto and numerical value map, and analysis result is outputed to picture;
Said database is by forming by the graphics plane data storehouse, rivers and creeks and the data of attribute information storehouse, rivers and creeks of region with the aerophoto data of preserving suitable coordinate figure per year; This data of attribute information storehouse, rivers and creeks and graphics plane data storehouse, above-mentioned rivers and creeks are got in touch; Preserve following rivers and creeks information: with rivers and creeks characteristic information and the positional information by each region and the coupling of aerophoto per year, the width of following water route and dyke, length information and datum line information;
Said system drive assembly is controlled according to following mode: receive aerophoto and numerical value map; The resolution of each data of conversion and capacity; Coordinate system is offered this aerophoto; The interval, rivers and creeks of the aerophoto of this region is separated into a plurality of intervals, analyzes the rivers and creeks and change, when the identification constant interval, drive alarm.
2. the plane mutation analysis system in the rivers and creeks of employing aerophoto according to claim 1 and GIS; It is characterized in that the said system driven unit comprises: photo/map transformations portion, it will be the value of having set as the aerophoto of the large-capacity data that has received and the resolution and the capacity conversion process of numerical value map; Photo/map synchronization process portion, it is handled according to the mode of in aerophoto, setting coordinate figure; The separating treatment portion between the photo multi-region that quantizes, it will provide the interval, rivers and creeks of the aerophoto of coordinate figure to be separated into a plurality of intervals, automatically import each interval code value; Rivers and creeks mutation analysis portion, it compares, analyzes above-mentioned aerophoto per year, through image relatively, to this each interval rivers and creeks change part whether existence is judged; Alarm generation portion, its changed through the identification of above-mentioned rivers and creeks mutation analysis portion interval the time, drive alarm; Computing/processing module; The setting of the control program of the aerophoto that it quantizes according to comparative analysis per year in advance; Control each structural portion; To by the zone, carry out computing and analysis, this assay value is outputed to picture, the drive controlling alarm by the interval plane changing value in rivers and creeks interval, per year.
3. the plane mutation analysis system in the rivers and creeks of employing aerophoto according to claim 2 and GIS is characterized in that above-mentioned rivers and creeks mutation analysis portion comprises:
The degree analysis portion of wriggling, it performs calculations to the low water route in rivers and creeks and the left side of dyke/right bank length, and the multiplying power of the length through rivers and creeks air line distance datum line is spent wriggling and to be carried out computing;
Rivers and creeks change width analysis portion, it carries out computing, analysis to the low water route in per year rivers and creeks and the width of dyke and the width ratio of low water route-dyke;
Plane, rivers and creeks mutation analysis portion, its numeric ratio through adopting above-mentioned sinuous degree analysis portion and above-mentioned rivers and creeks change width analysis portion with plane picture relatively, analysis plane variable condition.
4. plane mutation analysis method that adopts the rivers and creeks of aerophoto and GIS is characterized in that this method comprises:
Adopt aerophoto and numerical value map, make aerophoto have the 1st process of coordinate system;
Aerophoto per year specifically is separated into a plurality of intervals, automatically imports the 2nd process of each interval code;
Press each interval the 3rd process of movement images automatically;
Judge the 4th process that whether exists of constant interval;
When having constant interval, automatically drive the 5th process of alarm;
Constant interval is outputed to the 6th process of picture;
Extract the attribute information and the positional information of this constant interval out, it is outputed to the 7th process of picture.
5. the plane mutation analysis method in the rivers and creeks of employing aerophoto according to claim 4 and GIS is characterized in that:
Above-mentioned the 3rd process comprises:
The process of computing sinuous degree per year;
The process of the change degree of the width of low water route, computing rivers and creeks per year and dyke.
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| CN1405648A (en) * | 2001-08-09 | 2003-03-26 | 精工电子有限公司 | Electronic tide measuring instrument |
| US7042470B2 (en) * | 2001-03-05 | 2006-05-09 | Digimarc Corporation | Using embedded steganographic identifiers in segmented areas of geographic images and characteristics corresponding to imagery data derived from aerial platforms |
| CN101114023A (en) * | 2007-08-28 | 2008-01-30 | 北京交通大学 | Lake and marshland flooding remote sense monitoring methods based on model |
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| US7042470B2 (en) * | 2001-03-05 | 2006-05-09 | Digimarc Corporation | Using embedded steganographic identifiers in segmented areas of geographic images and characteristics corresponding to imagery data derived from aerial platforms |
| CN1405648A (en) * | 2001-08-09 | 2003-03-26 | 精工电子有限公司 | Electronic tide measuring instrument |
| CN101114023A (en) * | 2007-08-28 | 2008-01-30 | 北京交通大学 | Lake and marshland flooding remote sense monitoring methods based on model |
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