On the Appliation of the auxilary data in the composition of the
multiple data:
An example for Wuhan City
Guan Zhe-Qun, Shu Ning
Wuhan Technical University of Surveying and Mapping
Wuhan China
Abstract
In this paper the application methods of the auxiliary data for the composition of the multiple remote sensed data are discussed
- The auxiliary data and geographical network system are encoded by sampling and quantizing with adaptive mathematical model. After digitizing the auxiliary data, a independent band is obtained, and then composite with the remote sensed data which is geometrically rectified.
- The rational filtering operators in the restructured remote sensed data by introducing the 'information raster file which is derived from auxiliary data facilitate the image analysis and features selection.
- When the geometrical and spectral resolution of remote sensed data different from each other, the problem under study is find a auxiliary data which could provided the satisfactory hierarchical relation between them.
Finally, on the basis of the landform auxiliary data some experimental have been carried in wuhan area.
Introduction
The auxiliary data is useful to the recognition of an object. There are several important reasons. The first, many images do not contain concrete objects and sometimes image features tend to be ambiguous. Edge detection techniques, for example, mark the areas where intensity changes take place. Such line segments can indicate the objects surface boundaries, and may also indicate shadow edges. As a result, interpretation of an image often requires a combination of auxiliary data. The second, many images do not directly show us the information on some natural environment factors ( such as oil) , so when we analyse image features according to the formation cause of environment, we must use auxiliary data. The third, the resolution of many images are not often high enough to recognize objects which contain contingency and complexity, so we must apply auxiliary data in enrich the information of image.
A common approach for using the auxiliary data is that they and geographical network system are encoded by sampling and quantizing with adaptive mathematical model. After digitizing the auxiliary data, a independent band is obtained, and then composited with the remote sensed data which is geometrically rectified.
In this paper, on the basis of above, we mainly discuss the following application methods of the auxiliary data.
-
The rational filtering operators in the restructured remote sensed data by introducing the information raster file' which is derived from auxiliary data facilitate the image analysis and features selection..
- When the geometrical and spectral resolution of remote sensed data are different from each other, the problem under study is to find a auxiliary data which could provide the satisfactory relation between the various kinds of remote sensed data.
Finally, on the basis of the landform auxiliary data, some studies have been carried out. And the analysis of the composition of SPOT and TM images in Wuhan area has proved the flexibility of the proposed methods.
