CN105469051A - Impervious layer detection-based city outer contour extraction method and device - Google Patents
Impervious layer detection-based city outer contour extraction method and device Download PDFInfo
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Abstract
The invention discloses an impervious layer detection-based city outer contour extraction method and device. The method comprises the following steps that: step 1, an image segmentation technology is comprehensively utilized to realize object segmentation of a remote sensing image, and a homogeneous region is segmented into the same polygon object; step 2, a pervious property judgment method is utilized to realize the pervious property interpretation of segmentation objects, and impervious segmentation objects are extracted; step 3, based on the characteristic of a built area that impervious polygons are clustered, the clustering of the impervious segmentation objects can be realized through a clustering technology, and the impervious layer of the remote sensing image can be obtained; and step 4, the outer contour of a city is extracted based on the obtained impervious layer.
Description
Technical field
The present invention relates to remote sensing technology field, particularly relate to a kind of city Outside contour extraction method based on aquiclude detection and device.
Background technology
City is as the region of mankind's activity high concentration, and over nearly 30 years, China expands completed region of the city day by day, and its change produced is more violent and concentrated.City is as the center of regional socio-economic activity, and the Impact of land use of this expansion to its periphery is direct and huge.Completed region of the city outline is monitored effectively, its evolution process on area of space can be reflected, for researcher and decision maker provide scientific and effective foundation with a kind of continuation mode.
Built-up areas scope generally refers to the area that built-up areas outer contour can comprise, namely the scope that reaches of the actual construction land in this city.The delimitation of completed region of the city scope, consider the factor such as physiographic relief, landforms, and completed region of the city does not generally comprise the larger farmland of urban district inner area and is not suitable for the location of construction.
Along with the development of remote sensing technology, utilize remote sensing to carry out urbanization and monitor the concern being subject to scholar gradually, Chinese scholars utilizes remote sensing technology to attempt completed region of the city monitoring.Mundia (Mundiaetal.2005) uses the remote sensing image of different phase to analyze Land Use/land Cover Change and the Urban Expansion process in Nairobi city (Nairobi) in conjunction with socioeconomic data, and utilizes landform, geology and soil information to adopt the space-time dynamic factor of GIS methods analyst land use change survey.Li Sheng (Li Sheng etc. 2005), for Xiamen City, regulates vegetation index to extract completed region of the city in conjunction with normalization water body index, normalization building exponential sum soil, analyzes Urban Expansion spatial-temporal characteristics and the city expansion actuation.Zhao Xin etc. (Zhao Xin etc., 2006) adopt the method for maximum likelihood classification to extract Build-up Areas in Xuzhou, and carry out Expansion of Build-up Areas research in conjunction with GIS technology.Mu Fengyun (Mu Fengyun etc. 2007), adopting the mode of man-machine interaction to extract on the basis of Beijing's construction land area to Landsat satellite and " China DMC " satellite data, has carried out monitoring analysis to Beijing's Expansion of Build-up Areas process, area change and land use change survey.Li Tianhua etc. (Li Tianhua etc. 2007) use RS and GIS techniques to be extracted completed region of the city, Nanjing, row cutting power of going forward side by side analysis.Open (dance swallows etc. 2014) such as dance swallows and use EnvisatSAR image, utilize coefficient of coherence method, realize the extraction of completed region of the city profile.
Aquiclude refers to the natural or artificial material that can stop below water permeation to earth's surface, and such as roof, pitch, cement road and parking lot etc. have the ground surface of watertightness.Artificial aquiclude is the feature of urban area, and an important behaviour of urbanization is exactly the rising of aquiclude distribution ratio.Built-up areas based on nonagricultural population and nonfarm economy activity, aquiclude integrated distribution, and Impervious surface coverage is high; And rural aquiclude is rare, scattered distribution, Impervious surface coverage is totally lower.Show as at remote sensing images, reduced gradually to suburb to rural Impervious surface coverage by completed region of the city.The town site Impervious surface coverage being positioned at built-up areas outline line is higher, and distributes in flakes; And the Impervious surface coverage be positioned at outside the outline line of completed region of the city is low, the aquiclude patch that Impervious surface coverage is high is less, in fragmentary distribution.Utilize aquiclude can effectively monitor completed region of the city outline, but at present, the method utilizing waterproof region, city to carry out completed region of the city Outside contour extraction rarely have report.
Explore although completed region of the city Outside contour extraction technology has carried out some, explore the practical application of result distance and there is distance, subject matter shows:
(1) existing research method mainly adopt in low resolution image study, the method for proposition is applicable to middle low resolution remote sensing image, and simultaneously result precision is subject to the restriction of image resolution, and precision is not high.Along with developing rapidly of high score satellite, obtain a large amount of mass data, in the urgent need to a kind of disposal route being adapted to high resolution image.
(2) be subject to urban border definition indefinite, the impact that remote sensing boundary is undistinct, city outline boundary extraction method calculated amount is large, precision is not high, and some link man-machine interactively amount is large, therefore, the usual practicality of existing algorithm is not high, have impact on service application.
List of references:
MundiaC.N.，AniyaM.，Analysisoflanduse/coverchangesandurbanexpansionofNairobicityusingremotesensingandGIS.IntenationalJournalofRcnloteSensing，26(13)：2831-2849，2005.
Li Sheng. the sensor information of Xiamen City's urban heat island, run-off and impervious surface extracts research. University of Fuzhou Master degree candidate, academic dissertation, 2005.
Zhao Xin, Hu Zhaoling. the Expansion of Build-up Areas in Xuzhou based on RS and GIS is studied. Huaihai Institute of Technology journal (Social Science Edition), 4 (4): 61-63,2006.
Mu Fengyun, Zhang Zengxiang, Chi Yaobin etc. based on RS data Beijing 1973-2005 between the dynamic monitoring of completed region of the city and Driving force analyzing. remote sensing journal, 11 (2): 257-268,2007.
Li Tianhua, Ma Ling, Yang Wunian etc. application RS and GIS techniques extracts completed region of the city and Driving force analyzing--for Nanjing. Surveying and mapping, 32 (4): 124-125,2007.
Open dance swallow, Liu Qingchen, Meng Xiujun, the urban border based on SAR coefficient of coherence image is extracted, mapping and spatial geographic information, 37 (5): 56-59,2014.05.
Summary of the invention
In view of this, the present invention is directed to high score remote sensing image, propose a kind of city Outside contour extraction method detected based on aquiclude of novelty, realize city outline fast, high efficiency extraction.
According to an aspect of the present invention, which provide a kind of city Outside contour extraction method detected based on aquiclude, comprising:
Step 1, comprehensive utilization image Segmentation Technology, realize the Object Segmentation of remote sensing image, homogeneous region is divided into same polygon object;
Step 2, utilize permeable property determine method, realize the permeable attribute interpretation of cutting object, extract waterproof cutting object;
Step 3, the feature utilizing the waterproof polygon in built-up areas to assemble, utilize convergence technology to realize the polymerization of waterproof cutting object, obtain the aquiclude of remote sensing image.
Step 4, extract city outline based on obtained aquiclude.
According to a further aspect of the invention, it also offers a kind of city Outside contour extraction device detected based on aquiclude, comprising:
Segmentation module, comprehensive utilization image Segmentation Technology, realize the Object Segmentation of remote sensing image, homogeneous region is divided into same polygon object;
Water permeability judge module, utilizes permeable property determine method, realizes the permeable attribute interpretation of cutting object, extracts waterproof cutting object;
Determination module, the feature utilizing the waterproof polygon in built-up areas to assemble, utilizes convergence technology to realize the polymerization of waterproof cutting object, obtains the aquiclude of remote sensing image.
Extraction module, extracts city outline based on obtained aquiclude.
The present invention adopts Object--oriented method to judge cutting object integrity attribute, and avoiding in classic method take pixel as the limitation of processing unit, greatly improves aquiclude and judges precision; The solution of the present invention have employed space vector analytical technology, is filled with the cavity that completed region of the city inner park, greenery patches etc. are formed, and eliminates the zone of dispersion that around small towns, scenic spot are formed, extracts purer completed region of the city scope.The method is extracted as basis with completed region of the city aquiclude, set up the completed region of the city outline bound test technology of complete set, realize the quick identification on outline border, city, extraction and analysis, for city evolvement analysis, city are implemented the application such as assessment and provided support.
Accompanying drawing explanation
Fig. 1 is Outside contour extraction method flow diagram in city in the present invention;
Fig. 2 is polygon polymerization schematic diagram in the present invention;
Fig. 3 is that in the present invention, schematic diagram is rejected in scattered region;
Fig. 4 is empty polishing schematic diagram in the present invention;
Fig. 5 is testing image schematic diagram in the present invention;
Fig. 6 is whole scape Image Segmentation schematic diagram in the present invention;
Fig. 7 is the partial enlarged drawing splitting image in the present invention;
Fig. 8 is the waterproof polygon object schematic diagram after judging in the present invention;
Fig. 9 is the waterproof polygon object schematic diagram of regional area in the present invention;
Figure 10 is the polymerization figure of full-view image in the present invention;
Figure 11 is the polymerization figure of regional area in the present invention;
Figure 12 is result schematic diagram after the zonule of full-view image in the present invention is deleted;
Figure 13 is the built-up areas profile schematic diagram in the present invention after filling cavity;
Figure 14 is the built-up areas profile schematic diagram of regional area in the present invention;
Figure 15 is outline schematic diagram in built-up areas in the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
The present invention with high score remotely-sensed data for research object, the method that satellite remote sensing date and To Airborne Data Classification all can adopt the present invention to propose.
The city Outside contour extraction method based on aquiclude detection that the present invention proposes as shown in Figure 1, specifically comprises:
Step 1, comprehensive utilization image Segmentation Technology, realize the Object Segmentation of remote sensing image, homogeneous region is divided into same polygon object;
Step 2, utilize permeable property determine method, realize the permeable attribute interpretation of cutting object, extract waterproof cutting object;
Step 3, the feature utilizing the waterproof polygon in built-up areas to assemble, utilize convergence technology to realize the polymerization of waterproof object, obtain the aquiclude of remote sensing image.
Step 4, extract city outline based on obtained aquiclude.
Wherein, in step 1, Object Segmentation specifically comprises:
High score remote sensing image is resolved into the polygon object do not overlapped each other, in object, pixel has homogeneity attribute, has heterogeneous attribute between adjacent object.The Measures compare of segmentation is many, as watershed segmentation methods, Mean-shift dividing method, based on the dividing method of neuroid, based on morphologic dividing method etc., for the feature of high score image, in the present invention, adopt the multi-scale segmentation method based on mean shift (Mean-shift).
Judge specifically to comprise to the permeable attribute of object after segmentation in step 2:
According to polygon object property determine method, each segmentation polygon object is judged, polygon object is divided into permeable polygon and waterproof polygon, permeable polygon object is mainly greenery patches, forest land, farmland, paddy field etc., and waterproof polygon object is mainly road, square, building etc.Polygon object property determine method can adopt manual observation to judge, or adopts the automatic auxiliary judgment of computing machine, and conventional computer-assisted diasnosis comprises normalized differential vegetation index, normalization building index etc.The present invention preferably adopts the method for waterproof index to extract.
In step 3, waterproof object is polymerized and specifically comprises:
Object polymerization is that the multiple polygon object within the scope of certain distance are polymerized to a polygon.Completed region of the city has the aquiclude object of very dense usually, and utilize polygon polymerization technique to realize closing on the polymerization of waterproof polygon object, form single large regions aquiclude, this region can be used as approximate completed region of the city.General GIS handling implement has polygon polymerizable functional, typical in the PolygonAggregate instrument in Arcmap.Polygon polymerization as shown in Figure 2.
Extract city outline based on obtained aquiclude in step 4 to comprise:
After waterproof object has been polymerized, therefrom reject scattered region.After waterproof polygon polymerization, output large-area built-up areas polygon, also can produce some discrete little polygons at some small towns, scenic spots etc. of built-up areas circumferential distribution.According to the definition of built-up areas, built-up areas mostly are large area and become panel region, therefore can adopt area value, filter, the polygon that Retention area is large, remove the polygon that area is little.Scattered region is rejected as shown in Figure 3.
Extract city outline based on obtained aquiclude in step 4 also to comprise:
After waterproof object has been polymerized, polishing is carried out to cavity wherein.Inside, completed region of the city has the regions such as park, meadow, lake surface usually, and these regions are judged to be permeable region usually, cause the waterproof intra-zone after polymerization to contain cavity.According to the definition of built-up areas, the regions such as park, meadow, little lake surface are still seen as built-up areas part.The quantity in these cavities is few, and artificial method can be adopted to fill.Cavity polishing as shown in Figure 4.
Built-up areas Outside contour extraction test
The High Resolution Remote Sensing Data choosing Zhejiang city in October, 2014 is tested, and resolution is 8 meters, totally four wave bands.Image as shown in Figure 5.
(1) Object Segmentation experimental result
Input remote sensing image is split, and obtains vector file.Fig. 6 shows the segmentation effect of whole scape image, and Fig. 7 shows regional area segmentation effect.Therefrom can find out, in image, characterize identical object be split into a polygon object.
(2) the permeable determined property of object
According to polygon object property determine method, each cutting object polygon is judged, polygon object is divided into permeable polygon and waterproof polygon.Fig. 8 shows and obtains waterproof polygon set to after panoramic picture process.Fig. 9 shows the waterproof polygon object set of regional area.
Therefrom, we can see, the polygon object of built-up areas is mainly waterproof polygon, contains the atural objects such as urban road, buildings, square, and meanwhile, the park in built-up areas, meadow etc. are divided into permeable polygon.
(3) object polymerization
Converging operation is carried out to the waterproof polygon extracted, the polygon closed on is polymerized to large polygon, obtains aquiclude region.Figure 10 shows the polymerization result of panoramic picture, and Figure 11 shows the polymerization result of regional area.
(4) scattered region is rejected
After waterproof polygon polymerization, output large-area built-up areas polygon, also can produce some discrete little polygons at some small towns, scenic spots etc. of built-up areas circumferential distribution.According to the definition of built-up areas, built-up areas mostly are large area and become panel region, therefore can adopt area value, filter, and the polygon that Retention area is large mostly is built-up areas, remove the polygon that area is little.Result around Figure 12 shows and rejects behind scattered region, therefrom can find out that main city zone remains.
(5) empty polishing
Inside, completed region of the city has the regions such as park, meadow, lake surface usually, and these regions are judged to be permeable region usually, cause the waterproof intra-zone after polymerization to contain cavity.According to the definition of built-up areas, the regions such as park, meadow, little lake surface are still seen as built-up areas part.The quantity in these cavities is few, and artificial method can be adopted to fill.Figure 13 shows the built-up areas result behind supplementary cavity.Figure 14 show regional area supplement cavity after result.
After above-mentioned steps operation, substantially obtain built-up areas outline.Figure 15 shows the net result of final city Outside contour extraction.Contrast with bottom remote sensing figure, basic and border, built-up areas coincide.
The solution of the present invention utilizes the built-up areas Outside contour extraction method of aquiclude object.According to the waterproof polygon object feature in built-up areas, develop the scheme of a set of completed region of the city Outside contour extraction.Utilize remote sensing image Object Segmentation technology, realize the extraction of completed region of the city polygon object, then the distinctive characteristics of the permeable attribute of built-up areas polygon and non-built-up areas is utilized, realize built-up areas polygon identification, finally, utilize vector analysis technique, realize collecting of built-up areas scope inner polygon object and making up of cavity, thus propose complete completed region of the city outline.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1., based on the city Outside contour extraction method that aquiclude detects, comprising:
Step 1, comprehensive utilization image Segmentation Technology, realize the Object Segmentation of remote sensing image, homogeneous region is divided into same polygon object;
Step 2, utilize permeable property determine method, realize the permeable attribute interpretation of cutting object, extract waterproof cutting object;
Step 3, the feature utilizing the waterproof polygon in built-up areas to assemble, utilize convergence technology to realize the polymerization of waterproof cutting object, obtain the aquiclude of remote sensing image;
Step 4, extract city outline based on obtained aquiclude.
2. the method for claim 1, wherein Object Segmentation specifically comprises in step 1:
Remote sensing image is resolved into the polygon object do not overlapped each other, in object, pixel has homogeneity attribute, has heterogeneous attribute between adjacent object.
3. the method for claim 1, wherein judge specifically to comprise to the permeable attribute of object after segmentation in step 2:
According to polygon object property determine method, each segmentation polygon object is judged, polygon object is divided into permeable polygon and waterproof polygon, permeable polygon object comprises greenery patches, forest land, farmland, paddy field, and waterproof polygon object comprises road, square, building.
4. the method for claim 1, wherein waterproof object is polymerized in step 3 and specifically comprises:
Multiple waterproof polygon object within the scope of certain distance is polymerized to a polygon.
5. the method for claim 1, wherein describedly extract city outline based on obtained aquiclude and comprise: after waterproof object has been polymerized, therefrom reject scattered region.
6. the method for claim 1, wherein describedly extract city outline based on obtained aquiclude and comprise: after waterproof object has been polymerized, polishing is carried out to cavity wherein.
7., based on the city Outside contour extraction device that aquiclude detects, comprising:
Segmentation module, comprehensive utilization image Segmentation Technology, realize the Object Segmentation of remote sensing image, homogeneous region is divided into same polygon object;
Water permeability judge module, utilizes permeable property determine method, realizes the permeable attribute interpretation of cutting object, extracts waterproof cutting object;
Determination module, the feature utilizing the waterproof polygon in built-up areas to assemble, utilizes convergence technology to realize the polymerization of waterproof cutting object, obtains the aquiclude of remote sensing image;
Extraction module, extracts city outline based on obtained aquiclude.
8. device as claimed in claim 7, wherein, in segmentation module, Object Segmentation specifically comprises:
Remote sensing image is resolved into the polygon object do not overlapped each other, in object, pixel has homogeneity attribute, has heterogeneous attribute between adjacent object.
9. device as claimed in claim 7, wherein, judges specifically to comprise to the permeable attribute of object after segmentation in water permeability judge module:
According to polygon object attribute decision maker, each segmentation polygon object is judged, polygon object is divided into permeable polygon and waterproof polygon, permeable polygon object comprises greenery patches, forest land, farmland, paddy field, and waterproof polygon object comprises road, square, building.
10. device as claimed in claim 7, wherein, is polymerized waterproof object in determination module and specifically comprises:
Multiple waterproof polygon object within the scope of certain distance is polymerized to a polygon.
11. devices as claimed in claim 7, described extraction module comprises:
Module is rejected in scattered region, for after waterproof object has been polymerized, therefrom rejects scattered region;
Cavity polishing module, for after waterproof object has been polymerized, has carried out polishing to cavity wherein.
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| CN111275631A (en) * | 2020-01-08 | 2020-06-12 | 中国科学院东北地理与农业生态研究所 | Method for eliminating shadow interference during urban water body extraction by remote sensing image |
| CN112419446A (en) * | 2021-01-21 | 2021-02-26 | 武大吉奥信息技术有限公司 | Polygonal aggregation method based on superpixel segmentation |
| CN113205042A (en) * | 2021-04-30 | 2021-08-03 | 武汉大学 | Method and system for identifying multi-level boundaries of city |
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