From nineteen seventies, utilizing RSinformation to capture the land use information began in China and the technology of capturing land use information from RSimage developed rapidly.Authors divided the developing stage of the technology of our country into three different periods. First period, every stage of the work procedure is tiring and all the work was artificial. Second stage, the calculating of areas of every land use categories achieved automatic. Third stage, we utilized the full digital image to interpret and capture the land use information in the environment of the integration of RSand GIS. The process of digitizing was abbreviated. The precision was enhanced of course. And authors think that the technology in the near future is to develop the automatic system of image interpretation.
Ocean Primary Productivity (OPP) is defined as the photosynthetic rate of ocean plankton under sunshine. The satellite measuring for OPPis commonly known as unique way to help us understanding the time-space distribution of OPPin the globel ocean. In the paper, the key problems concerning the satellite measuring for OPPwill be discussed including the technical reguirements of ocean color satellite, primary productivity calculation, as well as calibration and validation of scientific data from satellite senor. In addition, will be given the sensors technical characteristics equipped on ocean color satellites launched in the past and near future.
In 1980s early, remote sensing technique of imaging spectrometer began to be developed as a new remote sensing technique. Recently, this technique has developed very fast, and has become one of the three development trends of remote sensing technique (imaging spectrometer, microwave and 3Ssystem). Because of these features of its high spectral resolution, hyperbands,and space image and spectra in one, developing the imaging spectrometer is not only able to more offectively and directly recognize the surface material of earth, but also it can more deeply research the component of making up material and it's structure. In this paper, the imaging spectrometer remote sensing technological development, the theoretical foundation, method and application are summarized.
Oil/gas geochemical prospecting is closely related to oil/gas remote sensing in exploration prinsiple, although they are two different techniques. Both of them are based upon the theory of hydrocarbon microseeping and supplemented to each other in oil/gas exploration. Surface geochemical anomalies coincide with remote sensing image anomalies in spatial distribution. The integration of the two makes evaluation of oil/gas indicating significance of anomalies more reliable and can raise oil/gas prospecting efficiency.
The methods of TMbands ratio and principle component analysis were used to select the characteristic vector that can stress gold alteration mineral information. Based on the characteristic vector, the color composite images were produced. The space filtering and non-supervised classification methods were further used to process the image. There were halo-shaped color abnormal areas in the image. After field verification, some color abnormal areas tally with the geochemical abnormal distribution. In three new-discovered gold ore occurrence, the tenor of gold is 2.74×10-6 , 9.61×10-6 and 9.6×10-6 . According to the color abnormal information in image and the sample analysis result, after analysis of metallogenetic conditions, three gold (silver, copper) mineralization prognostic area were given.
Hyperspectral remote sensing has great potentialities for application in geology. It can identify and extract directly the material of earth surface, especially the altered rock. And it also can quantify the composition and the abundance of material of surface using SUM (spectral unmixing method) and MGM(modified Gaussian method). But the latent texture information of hyperspectral remote sensing image was often neglected. The paper groped the method for extracting and quantity those rich texture information using the clip transformation and effective average gradient (EAG) technique in gray space and the multi-frequency transformation or the wavelet packets technique in frequency space. Aprocessing diagram of geological application of hyperspectral remotely sensing was given. It's potentialities for geological application can be imagined using Tibet Plateau as a test sample. At last, some questions, which must be resolved now or in the future, were discussed.
In the bank region of the reservoir in Ertan and Guandi hydro-electric power station,the land-use situation is successfully investigated with the spectral angle mapper classification and the visual interpretation methods by using the mosaic color infrared air-photos which are corrected by orthographic projection.
GIS and RS techniques were adopted in the development of The 3D-Stereo Terrain Displaying and Analysis System of Guilin. It uses digital topographic map as the key data source to set up the digital elevation model, and uses the digital picture of satellite remote sensing as the covering surface of strero-landscape. It possesses many new functions, such as, 3D-stereo picture can be displayed against 2D-plane map ,the observing (flying) parameter (position, altitude, direction and angle of view, etc.) can be set arbitarily. Further more, people can take a simulated flight up the sky following the scheduled arbitrary road to get a bird's-eye view, as if you are on the spot personally. Moreover, the system possesses the functions of drawing the sectional map of topography, analysing the slope of terrain, calculating the surface area of arbitrary region.