This paper has summarized the application status, existent problems and recent development trend of remote sensing technology in land and resources during the period of "the Ninth Five-Year Plan of National Economic Development ".

Characterized by short development period as well as strong function and agility, small satellites have been increasingly used in such fields as communication and remote sensing. In the construction of cyber Beijing, small satellites will serve as an important means to update fundamental geographic information and provide a new approach to practical applications such as supervising the city construction and inspecting the environmental change.

Based on color synthesis, textural analysis, image interpretation and extraction of concealed information, the authors interpreted the outcrop regions of Bayanhua Formation (K₁b), the basin-controlling NE-trending faults (F₁, F₂, F₃), the NNE-trending faults (F₂₁, F₂₀), the NW-trending faults and the nearly EW-trending faults, and updated the geological map of Bayantala basin, Inner Mongolia. An analysis of the information of paleochannels and geomorphology revealed the features of neotectonics. The recharge-flow-discharge characteristics of groundwater in relation to uranium mineralization were studied by extracting information of rock heat radiation and plant cover. On the basis of the above research, it is considered that the distribution of facies zones of Tenggeerian fan-deltas near the southeastern margin of the basin is controlled by F₃ and F₂; the pattern of Saihantalaian paleochannel is controlled by F₂, F₂₁and NW-trending faults, and the phreatic and phreatic-interlayer oxidation zone is controlled by the fault-block uplift generated by the combined action of NE-trending, NW-trending and nearly EW-trending faults.

Lying in the hinterland of the Taklimakan Desert, the Keliya River forms a mystic green corridor. Revealing the distribution features of the lower reaches of this fossil river is of great significance in the ecological construction and the groundwater source survey. Using X-band airborne SLA image as an important information source, combined with field investigation, this paper studied and analyzed the fundamental principle of this technique and the airborne SLA imagery features, stretching characteristics and changing process of the river course. By sampling data and sampling mathematical model, the authors approached the penetration effect of the airborne SLA image. The study indicates that the X-band of the airborne SLA image can penetrate a depth of 14.6cm in the region of background desert, and 10.34cm in the fossil river bed.

Based on satellite image interpretation and field investigation, combined with an analysis of the available geological data, it is held that the target strata of coal-bearing formation in Zhongdian area of Yunnan Province should be Pliocene and Pleistocene. The authors generalized the formation mechanism of the Cenozoic basin and the accumulation and deposition regularity of coal beds in this area. Five remote sensing coal-bearing prospective areas in Da Zhongdian and Xiao Zhongdian basins were delineated. This provides target domains and basic data for subsequent survey of coal resource in this area, and will be of some practical significance in relaxing the severe lack of coal resource in northwest Yunnan.

Dynamic monitoring is one of the merits of remote sensing. On the basis of different time images, this paper has discussed the method of bank dynamic monitoring in Hangzhou Bay, and found out the regularity of gradual bank changes along this bay. This provides a scientific basis for the rational development, management and protection of Hangzhou Bay.

The authors monitored dynamic changes of China's grassland by using TM datum based RS & GIS technology. The results show that the total grassland area in China was increasing from 1995 to 2000 with the increasing of high and middle cover grassland area, nevertheless, the area of low cover grassland was to some extent decreasing. Moreover, there is obvious difference in this aspect between north China and south China: the grassland area is decreasing remarkably in north China, which will exert harmful influence on the ecological environment of north China.

Using TM satellite data, the authors analyzed spectral curve features, chose the region of interest for supervising classification, vectorization and data conversion, and finally realized automatic interpretation of the rocky desertification spots on computer. This study indicates that the application of remote sensing technique to investigating rocky desertification is an effective means, which is characterized not only by short period but also by great accuracy.

This paper deals mainly with the method of dynamic DEM matching. Based on reviewing the current situation of missile guidance, the authors put forward a new idea of missile guidance-- missile guidance helped by dynamic DEM matching, with a description given concerning its idea and its implementation procedure. A lot of key problems of dynamic DEM matching are discussed, such as feature extracting, feature describing, feature matching, and solving of transform parameter. Two experiments are used to prove its effectiveness. It is thus concluded that the idea of dynamic DEM matching is feasible. The suggestion about further research is also made in this paper.

DEM (Digital Elevation Model) is the most important basis of the Digital Earth model and other digital models. There are many methods to obtain it. This paper discusses the technique and procedure of DEM extraction by using airphotoes under OEAD platform? An example of DEM extraction for Jinlong Mountain is given, and some problems existent in DEM extraction are discussed.

Many scientists have probed into using hyperspectral indexes to identify vegetation and their coverage, and created many methods. These methods, however, are based on statistics and regression analysis, and do not necessarily suit all floristics in a specific area. This paper described some of the methods, took the dominant vegetations in Yanhe drainage area as examples to compute their indexes and discuss their spectral characteristics as well as the affecting factors, and summed up the methods for identifying the dominant plants in the area with spectrum indexes. The utilization of the water absorbtion indexes controlled by water content of plants on the central bands of 970nm and 1190nm is also proposed to help identify the plants.

Using fractal theory, this paper analyses land types of Nanji Island. The complexity, fragmental degree and shape property of the polygons are described quantitatively by means of fractal dimensions and shape parameters. The results show that the fractal dimensions of the shrubbery and the meadow are very large while the fractal dimensions of the bleachery, the village and the farmland are relatively small. This indicates that the fractal dimensions are related to human activities.

Located in the middle-upper reaches of the Yangtze River, the Dongting Lake is the second largest fresh- water lake in China. In recent years, flood damage has occurred very frequently, and seriously threatened people's life and property. Through computer interpretation and area calculation based on TM images from eight different times, the area and volume of the lake were estimated and the mathematical equation of the area-level and volume-level were established. With this equation, the regulating and storing capacity of the lake was evaluated, and the results prove to be satisfactory and are of great significance in reducing damage and controlling flood.

According to the consistency of time and space in the information of policed GIS, this paper introduces the time-vector and the technology of "data-digging", and designs the system of intellectualized policed GIS software. The system inosculates the analysis of time-space with logistic consequence, and has the functions of realizing fast prediction and assisting policy decision.

As the methodology of dating is unceasingly improving and the isotopic chronologic data are becoming more and more complicated, database management technique should be introduced into geochronology. A geochronologic database system on the basis of Visual FoxPro has been founded in China in which the pre-Cambrian U-Pb, Sm-Nd, Rb-Sr isotopic chronologic dates are used. The test results show that it is an effective means to store, input, modify and renew the isotopic chronologic data.