This paper describes a land cover classification method, which uses time-series and low spatial resolution satellite images, and which can discriminate the feature space with high reliability for classification from the other. The method decomposes a whole of image histogram into each component, feature distributions of pure classes and mixel class. The decomposition result gives the likelihood function for a specific land cover class, then the feature space is discriminated based on the likelihood function. Validation demonstrates that the presented method is effective to improve the representativeness of training data sets.
A method for the vicarious calibration of visible to near infrared radiometers onboard satellites based on the reflectance based method with a onsite calibration of ground based measuring instruments is proposed. It is found that approximately 39.34 [%] of improvement of the vicarious calibration accuracy can be achieved for the proposed method in comparison to the old method of reflectance based method. The error budget analysis result shows that 9.61 [%] of improvemnet on vicarious calibration accuracy can be achieved comparing to the typical reflectance based method.
As acquisition of the position coordinate data of 2 dimensions or 3 dimensions needs time and labor, recently some real time acquisition of the GIS data using electronic flat board and GPS has been introduced. However, because it is using GPS, there are many problems the system itself is quite expensive, and it is impossible to acquire data in the urban area. Therefore, to acquire the position data easily and rapidly in the urban area where the data acquisition is difficult, a simple type mobile interface system is developed. It consists of the laser, gyro, electronic compass (the magnetic azimuth sensor) and DGPS. It controls all the data with one personal computer and it acquires data.
The increase of CO2 absorption by afforestation and reforestration is regarded as the decrease of greenhouse effect gas discharge in the Kyoto protocol. Therefore, it is necessary to monitor forest change in a wide area. For the purpose of monitoring forest area change widely, two methods were developed for measuring the crown cover ratio of forest by using aerial photograph or airborne laser scanner. In the further study, the method to measure the diameter at breast height (DBH) of trees was developed by using ground-based laser scanner. We obtained good results, whereas it is necessary to improve and validate these methods.