Abstract
The interpretation of geological structures on earth observation images involves like many other domains to both visual observation as well as specialized knowledge. To help this process and make it more objective, we propose a method to extract the components of complex shapes with a geological significance. Thus, remote sensing allows the production of digital recordings reflecting the objects’ brightness measures on the soil. These recordings are often presented as images and ready to be computer automatically processed. The numerical techniques used exploit the morphology ma- thematical transformations properties. Presentation shows the operations’ sequences with tailored properties. The example shown is a portion of an anticline fraction in which the organization shows clearly oriented entities. The results are obtained by a procedure with an interest in the geological reasoning: it is the extraction of entities involved in the observed structure and the exploration of the main direction of a set of objects striking the structure. Extraction of elementary entities is made by their physical and physiognomic characteristics recognition such as reflectance, the shadow effect, size, shape or orientation. The resulting image must then be stripped frequently of many artifacts. Another sequence has been developed to minimize the noise due to the direct identification of physical measures contained in the image. Data from different spectral bands are first filtered by an operator of grayscale morphology to remove high frequency spatial components. The image then obtained in the treatment that follows is therefore more compact and closer to the needs of the geologist. The search for significant overall direction comes from interception measures sampling a rotation from 0 to 180 degrees. The results obtained show a clear geological significance of the organization of the extracted objects.
Highlights
Photointerpretation uses the intuitive and deductive skills of photo interpreter and includes processes that allow him to define the studied object’s color as its radiometric value, optical density, grayscale, shape, size, environment and spatial and spectral relationships with other objects (Texture, Structure)
To help this process and make it more objective, we propose a method to extract the components of complex shapes with a geological significance
The results are obtained by a procedure with an interest in the geological reasoning: it is the extraction of entities involved in the observed structure and the exploration of the main direction of a set of objects striking the structure
Summary
Photointerpretation uses the intuitive and deductive skills of photo interpreter and includes processes that allow him to define the studied object’s color as its radiometric value, optical density, grayscale, shape, size, environment and spatial and spectral relationships with other objects (Texture, Structure). Geomorphologic using remote sensing, the number of spatial images to interpret becomes increasingly important. With computer aided design of geological structures and geomorphological features on many images is a goal that fits into this framework. A major difficulty for numerical simulation of a photo-geological reasoning is to preserve the interpreted properties in a continuous space by models applied to the discrete space of the digital image. Textural elements in obvious visual interpretation may be discrete entities in the image. The reasoning model must preserve this “thematic connection” of the interpreter [1]
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