42 results about "Variance (land use)" patented technology

The invention discloses a quantitative analysis method for river runoff change caused by climate change and human activities. The method comprises the steps of collecting hydrological and meteorological information, water resource evaluation data and human activity information in a basin, judging a mutation point of an annual runoff process, wherein the part before the mutation point is a natural stage of the basin and the part after the mutation point is an influence stage of the basin, the entire natural runoff sequence is reconstructed by using the hydrological and meteorological information of the natural stage, using hydrological model rating model parameters and then using meteorological information of the whole period, and analyzing the contribution of climate change and human activities to the river runoff change by using the difference between the reconstructed natural runoff and the actually measured runoff. By adopting the quantitative analysis method for river runoff change caused by climate change and human activities, in combination with situations such as hydrological and meteorological factor changes, land use changes and water use in the basin, the binary attribution analysis of the river runoff change caused by climate change and human activities is extended to quaternary attribution analysis of the river runoff change caused by rainfall change, climate change, land use change and water use.

The invention discloses a remote sensing change measuring method in land application / covering. The invention uses new type remote sensing change measuring method and forms land type research results compounded with history; then it uses these results to form map (generally these are vector or grille type with vector spot characters) and dose in turn detecting to the change of land application / covering.

The invention provides a biomass carbon emission estimation system and method based on life cycle analysis. The system includes: a data acquisition module for receiving the measured actual data; A knowledge base for storing vegetation carbon dynamics models, calculation formulas involved in each module, and parameter values involved in the calculation process; a Database for storing the actual data obtained from measurement, intermediate data and calculation results in the calculation process of each module; a Carbon emission estimation module, including: fossil energy carbon emission, land use change carbon emission, biomass carbon emission and biomass use carbon emission estimation sub-module; Each sub-module obtains the measured data from the database and calculates the carbon emissionwith the calculation formula in the knowledge base. The total carbon emission estimation module retrieves the calculation results of the carbon emission estimation module in the carbon emission estimation module from the database to estimate the total carbon emission. The invention fully considers the carbon emission of the whole process of the biomass in the life cycle analysis, and can truly estimate the carbon emission of the biomass.

The invention relates to an automatic updating method of a land-use map based on historical data and remote sensed data. Firstly historical data is pre-processed to obtain a land-use patch number map and a land-use mode code map which are overlapped with a remote sensed image first main component map, and various land-use mode patch feature structure arrays are obtained through calculation; changed patches are detected by adopting a cycle average value significance statistical test method; land-use unchanged regions are used as the samples of land-use interest regions; and minimum distance supervised classification is performed to land-use changed regions to obtain the land-use maps of the changed regions, and the land-use maps of the changed regions are united with the images of and-use unchanged regions to obtain new land-use maps. The automatic updating method adopts two data sources, improves the variation test precision, realizes the updating automation of the land-use maps, can be applied to the departments of land and resources to update a great amount of land-use map data, quickly test the land-use variation, and has wide market prospect and application value.

The invention provides a forestry carbon accounting method based on an ecological process model. The forestry carbon accounting method based on the ecological process model comprises the following steps of S1, determining a plant physiological parameter, S2, setting a spatial interpolation, S3, building a forestry carbon accounting model, S4, building an interference module, and S5, determining a model initial state. According to the forestry carbon accounting method based on the ecological process model, the interference module is provided for simulation of land use changes and felling, dynamic changes of forest carbon cycles of the Szechwan province and influence caused by different interferences can be truly reflected, simulation is more accurate, rapid and accurate compilation of greenhouse gas emission inventories relevant to forestry of different levels of China and provinces, and the compilation process is perfect, and meets the international requirements.