Thin plate spline interpolation is a widely used approach to generate a digital elevation model (DEM) from contour lines and scattered data. In practice, contour maps are scanned and vectorized, and after resampling in the target grid resolution, interpolation is performed. In this paper we demonstrate the limited accuracy of this process, and propose a high resolution processing method (withou...

Self Organizing Maps (SOMs) have attracted the attention of many computer vision scientists, particularly when dealing with image segmentation as a contour extraction problem. The idea of utilizing the prototypes (weights) of a SOM to model an evolving contour has produced a new class of Active Contour Models (ACM s), known as SOM based ACM s. Such models have been proposed in general with the ...

Students have trouble using and interpreting topographic maps. Experienced map-users identify patterns of contour lines representing topographic structures and visualize that information in 3D. Novices struggle with both recognizing 2D patterns and visualizing 3D structures from contour lines. In this study, the Pattern Identification group received instruction focused on identifying contour pa...

A blind watermarking method for the copyright protection of sets of polygonal lines in vector graphics images and GIS data (elevation contour maps) is presented in this paper. The paper focuses mainly on the use of simple fusion rules for combining the detector outputs from each polygonal line in order to come up with a global detection result. Experimental comparison of the various fusion meth...

the trend of changes in water quality plain eyvanakey to manage shared water resources is necessary semnan and tehranprovince.for this purpose after determining the study range in the eyvanekey area, field investigation was performed to identify the geological formations and the distribution there of as well as the faults and salt domes locations using existing geological maps. afterwards throu...

The final products/maps of any synergistic geo-scientific interpretation project of an E&P company are stored as CGM (Computer Graphics Meta) files. These include (1) time and depth maps at various levels and (2) maps of sand extent and thickness in established or development fields used for reserve estimates. Normally, CGM files for maps of former type are generated in various interpretation w...

Large-scale sensor networks impose energy and communication constraints, thus it is difficult to collect data from each individual sensor node and process it at the sink. In this paper, we propose an efficient data-collection scheme that can be used for event monitoring or network-wide diagnosis. Our scheme relies on the well-known representation of data – contour maps, which trade off accuracy...

A novel method is proposed to detect multi-part objects of unknown specific shape and appearance in natural images. It consists in first extracting a strictly oversegmented map of circular arcs and straight-line segments from an edge map. Each obtained constant-curvature contour primitive has an unknown origin which may be the external boundary of an interesting object, the textured or marked r...