CN102645650A - Landslide dynamic identifying and monitoring technology based on synthetic aperture radar differential interferometry (D-InSAR) - Google Patents
Landslide dynamic identifying and monitoring technology based on synthetic aperture radar differential interferometry (D-InSAR) Download PDFInfo
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Abstract
The invention discloses a landslide dynamic identifying and monitoring technology based on synthetic aperture radar differential interferometry (D-InSAR). The landslide dynamic identifying and monitoring technology solves practical problems in D-InSAR landslide disaster monitoring in alpine valley regions, and the information which means nothing to landslide identification can be filtered, so that a landslide area in which deformation happens is found out in a monitoring range. A method for extracting a landslide disaster range from D-InSAR monitoring results comprises the following steps of: extracting an area according with landslide moving characteristics from the D-InSAR monitoring results through a sloping filtering technology; analyzing a D-InSAR reliable area, and extracting reliable data from the monitoring results according to the reliable area; performing a filtering analysis method of flat areas and a filtering analysis method of movement errors; and performing a landslide identification method based on a time-space continuity technology.
Description
Technical field
The present invention relates to the synthetic-aperture radar monitoring field of geologic hazard.
Background technology
Landslide disaster as the typical geology disaster all causes serious harm to the country and people every year.Therefore it is vital landslide disaster being carried out effective monitoring and warning.Effective early warning on landslide is will know the landslide at which, knows where be to come down to go monitoring again and be not only.The Dynamic Recognition on landslide and trend monitoring are one of important contents of Regional Landslide disaster monitoring.The traditional face of land, landslide deformation monitoring method mainly contains Geodetic surveying method, GPS (GPS) method, automatic ductilimeter method and distribution type fiber-optic method etc.These monitoring methods all are " point " formula collecting methods, can not be comprehensively the whole planar situation of Landslide Deformation in the reflecting regional intactly, spatially can not satisfy the purpose of wide area landslide EARLY RECOGNITION and dynamic monitoring.
Interfering synthetic aperture radar (InSAR) and differential technique (D-InSAR) thereof are the new methods that grows up gradually in the 90's of last century.This technology is mainly used in topographical surveying aspects such as (setting up the digitizing elevation), ground deformation monitoring (like earthquake deformation, land subsidence, active tectonics, landslide and ice movement monitoring) and volcanicity.Compare with traditional geologic hazard monitoring method, have following characteristics.
A, coverage are big, because the satellite radar interferometry can cover hundreds of to thousands of square kilometres scope, therefore can obtain the deformational displacement data in whole zone.
B, need not set up monitoring net, need not design monitoring net in advance as GPS and total powerstation etc. and carry out the website image data, the satellite radar interferometry only need know that shooting area gets final product, once take can cover region-wide.
C, spatial resolution height can obtain the continuous face of land deformation data in a certain area.
D, can monitor or identify potential or unknown ground deformation information.
E, round-the-clock, not reached by cloud layer influences round the clock.What the satellite radar imaging was adopted is the long electromagnetic wave of wavelength, can penetrate cloud layer, does not receive the restriction at daytime and night, can carry out real-time dynamic monitoring to the zone of coming down.
The development of SAR technology and will be a revolution on the monitoring technology in the surface displacement Application in Monitoring from now on, it not only makes the monitoring cost reduce greatly, and can centimetre in addition millimeter level scope in the situation of change of ground displacement in the monitoring continuum.Not only can be to monitoring the variation tendency on known landslide, and can find potential landslide.
Show after deliberation; Because the quality of image of SAR receives the image of multiple factor; Only use in the displacement that the method for differential interferometry synthetic-aperture radar obtains; Also be mingled with some for the useless data of landslide monitoring, therefore must assist some reprocessing analysis methods that data are carried out filtering, thereby reach the purpose of monitoring.
Summary of the invention
For realizing removing the information useless to the geology disaster monitoring, effectively extract the landslide disaster information of D-InSAR monitoring, the present invention provides a cover filtering method, comprises the steps.
A, the sight line through the D-InSAR result are carried out projection with it along the domatic direction of moving towards to displacement, and being regarded as this monitor value if projection is consistent with domatic trend is the landslide monitoring effective value, if in the opposite direction then be invalid value.
B, utilize the angle of satellite sight line and domatic normal, with 45 ° be threshold value, will be regarded as insincere zone greater than the data of the D-InSAR monitored area in 45 ° zone and remove.
C, with the DEM (digital elevation model of monitored area; Data for grid format) find the solution the gradient; The gradient in the monitored area is regarded as flat site less than 10 ° scope, and flat site can not produce the landslide, therefore utilizes this principle to carry out filtering for the third time.
D, with the wavelength parameter of SAR satellite 1/2 as keeping watch on error threshold, sight line is to the be regarded as effective monitoring of displacement greater than this threshold value, thereby utilizes this principle to carry out the 4th filtering.
E, above-mentioned filtered is carried out area dividing according to the principle of space continuity, again the result is superposeed according to time series, classify according to the time continuity principle.
Description of drawings
Fig. 1 sets at SARscape to obtain sight line in the dialog box to displacement.
Fig. 2 is the flow chart of steps of processing procedure of the present invention.
Fig. 3 is each the step design sketch in the treatment scheme of the present invention.
Fig. 4 is that grid calculates the menu item synoptic diagram.
Fig. 5 is that grid calculates the dialog box synoptic diagram.
Fig. 6 is a displacement result design sketch after the filtering of the present invention.
Fig. 7 is a space continuity analysis result design sketch among the present invention.
Fig. 8 is the displacement result synoptic diagram that time continuity is analyzed.
Embodiment
Some operational methods that the present invention relates to.
1, the acquisition of aspect displacement.
First method is to be the dialog box selection Slope Displacement of the final step of D-InSAR three rail difference at SARscape (data of synthetic aperture radar process software) software, and is as shown in Figure 1.
Second kind method is to calculate through formula, and formula is following.
Wherein: the A=Slope slope angle, the B=Zenith incident angle, C=Azimuth incident orientation angle, D=Aspect gradient position angle, the E=SightDisplacement sight line is to displacement.
2, the solution formula of the angle of satellite sight line and domatic normal does.
Wherein: azimuthAngle is the satellite flight position angle, the angle of θ satellite face of land vertical line, and δ representes position angle, the face of land, α representes the surface slope angle.
In order to make those skilled in the art person understand the technical scheme among the present invention better; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtained should belong to the scope that the present invention protects.
Processing procedure of the present invention always is divided into the completion of six steps, is respectively aspect displacement filtering, trusted area filtering, flat site filtering, the filtering of ground displacement error, space continuity regional assignment, time continuity regional assignment, and is as shown in Figure 2; Each step effect is as shown in Figure 3.
The first step, aspect displacement filter analyses.
Aspect displacement filtering mainly is the inherent feature that moves according to rock soil mass; The grid counter of employing ArcGIS can obtain the filtered aspect displacement diagram of aspect displacement [SlopeDisplacement1] with the negative loop deletion of aspect displacement, like Fig. 4, shown in Figure 5.
Second step, trusted area filter analyses.
Utilize the grid counter that trusted area figure multiply by aspect displacement diagram [SlopeDisplacement1] and can obtain the filtered aspect displacement diagram of trusted area [SlopeDisplacement2].
The 3rd step, flat site filter analyses.
(1) zoning of flat site.
Utilize the grid counter that the gradient is extracted greater than 10 ° scope, and the grid point value in the scope is set at 1, remainder is a null value, thereby obtains the smooth regional filtering figure of a Zhang Ping.
(2) flat site filtering.
Utilize the grid counter that flat site filtering figure multiply by aspect displacement diagram [SlopeDisplacement2] and can obtain the filtered aspect displacement diagram of trusted area [SlopeDisplacement3].
The 4th step, rock soil mass displacement error filter analyses.
Utilize the grid counter that the area filter of shift value less than 100 millimeters fallen, can obtain the aspect displacement diagram [SlopeDisplacement4] after the rock soil mass displacement error filter analyses.Displacement result is as shown in Figure 6 after the filtering of the present invention.
The 5th step, space continuity analysis.
It is continuous on the space with first phase that space continuity changes; This situation presents large-area change value bunch on result; Deformation has all appearred in space continuity explanation most atural object in this zone, explains that in a sense atural object moves in integral body here.Space continuity analysis result is as shown in Figure 7 among the present invention.
The 6th step, time continuity analysis.
Time continuity is exactly that same place has all presented variation feature at a plurality of observation periods; This situation presents the coincidence of variation blurring phase on result; Space continuity explanation should the zone As time goes on; Be in upset condition always, explain that in a sense being located in atural object is in deformed state always.
From Fig. 8, six times three rail difference analysis result sees, can both embody the variation in this zone, therefore demonstrate a kind of time continuity, and the numerical value that changes is to become big successively.This zone is in the continuity that has all shown change aspect time and the space.
Can judge this thus and locate to be landslide disaster, in like manner in this coverage, find out other landslide disasters and get final product.
Claims (6)
1. a landslide Dynamic Recognition and monitoring technology of interfering difference based on D-InSAR is characterized in that:
The method of A, utilization aspect displacement filtering is carried out filtering to D-InSAR grid format monitoring result;
B, utilization trusted area are carried out the extraction of trust data to monitoring result;
C, utilization gradient filtering are with the filtering of flat site;
D, as keeping watch on error threshold monitoring result is carried out filtering with 1/2 of the wavelength of SAR satellite;
E, filtered is carried out the continuity analysis, thereby obtain the landslide disaster distribution plan.
2. require said method according to right 1, it is characterized in that, steps A specifically comprises:
A1, confirm the angle on the satellite direction of visual lines and the face of land according to landform and satellite parametric reduction;
A2, sight line is projected to the aspect displacement to displacement according to the angle on the satellite direction of visual lines and the face of land;
A3, the principle of using the landslide to move, negative can not appear in the aspect displacement, so the negative of aspect displacement is partly filtered out.
3. require said method according to right 1, it is characterized in that, step B specifically comprises:
B1, confirm the angle of satellite direction of visual lines and face of land normal according to landform and satellite parametric reduction;
B2, the angle of finding according to satellite direction of visual lines and the face of land will be regarded as insincere zone greater than the zone of 45 ° of angles, and smaller or equal to the trusted area that is regarded as of 45 ° of angles, heavily classification obtains trusted area filtering template;
B3, the result that steps A is obtained adopt trusted area filtering.
4. require said method according to right 1, it is characterized in that, step C specifically comprises:
C1, according to DEM computing slope figure, and with 10 ° be the boundary, less than this value be flat site, heavily classification obtains flat site filtering template;
C2, the result that step B is obtained adopt land regions filtering.
5. require said method according to right 1, it is characterized in that, step D specifically comprises:
D1, with the wavelength of SAR satellite 1/2 as keeping watch on error threshold, less than this value be error band, heavily classifying obtains error band filtering template;
D2, the result that step C is obtained adopt error band filtering.
6. require said method according to right 1, it is characterized in that, step e specifically comprises:
E1, the result that step D is obtained adopt the space continuity judgment criterion, carry out area dividing;
E2, the result that step e 1 is obtained carry out the space coupling according to time series, are adopting the time continuity judgment criterion, and it is qualitative that each region of variation is carried out change type, thereby draw the zone, landslide.
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| CN102927934A (en) * | 2012-11-07 | 2013-02-13 | 中南大学 | Method for obtaining mining area earth surface three-dimensional deformation fields through single interferometric synthetic aperture radar (InSAR) interference pair |
| CN103675790A (en) * | 2013-12-23 | 2014-03-26 | 中国国土资源航空物探遥感中心 | Method for improving earth surface shape change monitoring precision of InSAR (Interferometric Synthetic Aperture Radar) technology based on high-precision DEM (Digital Elevation Model) |
| CN103777237A (en) * | 2012-10-17 | 2014-05-07 | 中国石油化工股份有限公司 | Surface elevation smoothing method based on space-variant weighted banding wave-number domain filtering |
| CN104062660A (en) * | 2014-07-14 | 2014-09-24 | 中南大学 | Mining area earth surface time sequence deformation monitoring method based on time domain discrete InSAR interference pair |
| CN104715255A (en) * | 2015-04-01 | 2015-06-17 | 电子科技大学 | Landslide information extraction method based on SAR (Synthetic Aperture Radar) images |
| CN104991249A (en) * | 2015-08-12 | 2015-10-21 | 桂林电子科技大学 | Landslide MIMO radar monitoring system and monitoring method |
| CN105467389A (en) * | 2015-12-23 | 2016-04-06 | 首都师范大学 | Method for applying ground subsidence evolvement rules under differential modes in analysis of shallow ground surface space |
| CN105974411A (en) * | 2016-04-28 | 2016-09-28 | 电子科技大学 | DINSAR (differential interferometric synthetic aperture radar)-based high-voltage transmission tower top tilt displacement monitoring method |
| CN106526590A (en) * | 2016-11-04 | 2017-03-22 | 山东科技大学 | Method for monitoring and resolving three-dimensional ground surface deformation of industrial and mining area by means of multi-source SAR image |
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