星載對地三維立體遙感ppt課件

1、2021-10-81;Introduction1. Why stereo remote sensing ?2. Three means of stereo remote sensing 3. 2.1 Spaceborne stereo optical imaging remote sensing 4. 2.2 Spaceborne micirowave inSAR stereo remote sensing 5. 2.2.1 Spaceborne SAR Remote Sensing Imaging 6. 2.2.2 The principle of Spaceborne InSAR7. 2.

2、3 Spaceborne Lidar ranging remote sensing8. Stereo remote sensing application9. 3.1 Spaceborne stereo optical imaging remote sensing application10.3.2 Spaceborne micirowave inSAR stereo remote sensing11.3.2.1 the SAR stereo remote sensing application and data source12.3.2.2 InSAR Application in Ster

3、eo Remote Sensing13.3.3 Spaceborne Lidar ranging remote sensing14.Conclusion and the prospect of spaceborne Lidar stereo remote sensing application ;3n To acquires the 3D stereo image of the topography of the scenenThe image acquired will be different according to the range and angle relate to scene

4、 and imager. nHuman can observe the earth by all kinds of imager from satellite above hundreds of kilometers high, so Spaceborne ones have the high efficiency.n Spaceborne stereo remote sensing is the means of the acquisition stereo information of the scene of the earth from the satellite.n Definiti

5、on of Stereo remote sensing ;Broad senseBroad senseTypes of the land overlaysTypes of the land overlays Attributes of buildings Attributes of buildingsSurface runoff Surface runoff EnvironmentsEnvironments and Atmosphere and AtmosphereStereo space scale informationStereo space scale informationandan

6、dOther attibutes can be estimated by Other attibutes can be estimated by spectral,laser or microwave remote sensing waysspectral,laser or microwave remote sensing waysNarrow senseNarrow sense Geographic Geographic Latitude Latitude Longitude LongitudeHeightHeightStereo space scale Stereo space scale

7、 informationinformationDefinition of Stereo remote sensing ;5nSpaceborne stereo optical imaging remote sensing n Spaceborne microwave InSAR stereo remote sensing nSpaceborne Lidar ranging remote sensing;6n Principlen imaging from satellite using stereo imaging cameran Stereo 3D information are from

8、at least two image from appropriate observation Anglen The present optical imager on orbit (table 1);7SatelliteDroidLaunch Time Sensor typeSwath Product resolutionRecurrence cycleSPOT5: HRSFrance2002.5.4Tw o - l i n e -array150kmAlong track：5m；across track 10m；altimetry precision：10-15m5D（26D）CartoS

9、at-1Indian2005.5.5Tw o - l i n e -array26KmLocating precision:10m;altimetry precision：5m5DALOSJapan2006.1.24Three-line-array70KmLocating precision:1m,GSD:2.5m46dWorldView-2USA2009.10.6Single-array16.4KmLocating precision:8.5-10.7m(no condition point),2m(under condition point);GSD:0.46m(panchromatic)

10、,1.8m(multi-spectral);altimetry precision：0.3m(under condition point)1.1d(under resolution higher than 1m );3.7D(Sidesway:20deg,0.52m)GeoEye-1USA2008.9.6Single-array15.2KmLocating precision:5m(no condition point),2m(under condition point);GSD:0.41m(panchromatic),1.65m(multi-spectral)altimetry precis

11、ion：2m(under condition point)3.7D(Sidesway:20deg,0.52m);8nThe synthetic aperture radar(SAR)nIn the late 1970s spaceborne imaging radars began to play an important role in remote sensing, first for investigation of planetary surfaces, and later with the NASA satellite SEASAT, which was launched in 19

12、78, for Earth observation (Allan 1983, Elachi 1991,Raney 1982b). The synthetic aperture radar(SAR) is able to reliably map the Earths surface and acquire information about its physical properties, such as topography, morphology, roughness and the dielectric characteristics of the backscattering laye

13、r. As the spaceborne SAR systems operate in the microwave (cm to dm wavelength) regime of the spectrum and provide their own illumination they can acquire information globally and almost independently of meteorological conditions and sun illumination.;9n The principle of Spaceborne InSAR Fig.1 Princ

14、iple Diagram of InSAR The Pixels of the image acquired by spacebrone SAR system contain information of the intensity of the backscattered radar wave from the ground scene,as well as the range(from the imager to the scene) concerned phase information.The interferogram can be obtained by subtraction o

15、f two radar phase images of certain scene,which imaged from slightly different position or time. By the beneficial of high sensitivity to phase difference features, we can find the elevation information of the imaging scenen Some of the present SAR on orbit (table 2);SatelliteDroitLaunch time/Ended

16、timePolarization modeSwath widthS p a t i a l Resolution Earth topicsRecurrence cycle(day)ERS1ESA1991/2000.3.10VV100km10m x 5mOcean surface temperature and wind fields3/126ERS2ESA1995/2011.9.5VV250-350km10m x 5mER1S1+atmospheric zone monitoring3/24ENVISAT ASARESA2002/2012.4.8VV, HH,VV/HH, HV/HH, or

17、VH/VV56-100km;400 x 400km;10kmx5km;5kmx5km30m ;150m ;1000m .Landscape Topography , Snow and Ice ,Ocean Currents and Topography 2/35ALOS PALSARJAXA2006.1.12/2011.6.12V V, H H , V V / H H , HV/HH, or VH/VV40 - 70km;250 -350km;20 - 65km7 - 44m,14 to 88m,100mGeological Survey 2/46TerraSAR-X German2010.6

18、/-V V, H H , V V / H H , HV/HH, or VH/VV5 - 10km (width) x 5km (length);10km x 10km ;30km x 50km ;100km x 150km .1m ; 2m ;3m; ;18.5m ; 1,650 kmcommercial users around the globe2.5 COSMO-Skymed ASI COSMO 1: 2007.6.8/-;COSMO 2: 2007.12.9-/;C O S M O 3 : 2008.10.25/-;COSMO 4: 2011.11.6/-10km x 10km;40k

19、m x 40km;30km x 30km;100km x 100km;1m;3m;15m;30m100mglobal Earth observation16Table2 Some of the characteristics of spaceborne SAR;11n 3.1 Spaceborne stereo optical imaging remote sensing applicationn 3.2 Spaceborne micirowave inSAR stereo remote sensingn 3.3 Spaceborne Lidar ranging remote sensing;

20、12. Stereo remote sensing data is applied to generate a certain precision of the topographic map, or the existing topographic map revision.Data quality directly affect the mapping accuracy of remote sensing dataSatellite images suppliers can provide the data according to the accuracy requirements,wh

21、ich can be have different costs and barriers to purchase. The useable satellite stereo images must contains at least two the image data of the corresponding navigation and attitude data, so that it can be processed based on photogrammetry theory to recover the stereo feature of the target scene; How

22、ever, the optical remote sensing imaging is unable to be operate effectively in all-weather condition such as rainy,and has no sensing ability in the night without sunlight illumination(to visible light sensor) .;13nThree types of SAR interferometers and its application;14The main application are su

23、rveying and mapping, earth science, global atmosphere, the moon, asteroids and Mar decteting, on-orbit service, space station service etc.Table 4 Several Spaceborne Lidar payloadsClementineMOLA-2NRLGLASOrbit height640km400km50km600kmLaunch year1996.121996.11.71994.1.252003.1.13Planet detectedMoonMar

24、sRros asteroid Polar ice capsVertical resolution40m1m0320.15m（冰、陸地）Horizontal resolution100m300（along track）,4km(across track)500m170mIt can be seen that the measurement precision of height of spaceborne Lidar is much higher than other spaceborne altimeter mode referred to before.;15.uLidar can meas

25、ure the height of the global surface directly;uBoth SAR remote sensing imaging and optical remote sensing imaging must use at least two different images of a scene,at the same time it requires complex solutions to get the surface height information;uFor the height measuring precision,the elevation Lidar measured is in the highest precision contrast to other current technology;uComp