The all-nearest-neighbours (ANN) problem is a fundamental problem in computational geometry. In the letter a new two-dimensional triangular systolic array with mesh-connected cells is proposed for the ANN problem. Thi...
详细信息
The all-nearest-neighbours (ANN) problem is a fundamental problem in computational geometry. In the letter a new two-dimensional triangular systolic array with mesh-connected cells is proposed for the ANN problem. This array can process a queue of ANN problems at a throughput of one ANN problem per time period, with an efficiency of 100%.
Spring and summer acquired Thematic Mapper data of a spruce forest growing in southeastern Austria show the normalised differences ND1 and ND3, ratio R41, band differences BD1 and BD3, and the greenness index TMG empl...
详细信息
作者：
Kainz, WolfgangResearch Cent Joanneum
Inst for Image Processing & Computer Graphics Graz Austria Research Cent Joanneum Inst for Image Processing & Computer Graphics Graz Austria
This paper presents data structures and procedures for attribute assignment in geographical information system. Despite suggestions to apply conventional data base management systems for the manipulation of both spati...
详细信息
This paper presents data structures and procedures for attribute assignment in geographical information system. Despite suggestions to apply conventional data base management systems for the manipulation of both spatial and attribute data we take a different approach. Spatial data is stored in a way which takes into account the special nature of spatial information. Thematic information is represented hierarchically. For each subject a global theme file describes the hierarchy, data fields and types of each attribute item for each level. A copy of this structure gives the local theme file. Attributes may be assigned to spatial items, and vice versa, by an interactive process during or after digitization. Relations between corresponding items are established via a link file with pointers in either direction thus providing even multiple assignments.
The analysis of images can take advantage of existing knowledge;this may be denoted as data-driven or knowledge-based image analysis. One example is the use of topographic maps in the study of aerial imagery. We repor...
详细信息
We describe an algorithm for three-dimensional display of discrete objects in a discrete space. There are no restrictions on the objects: they may be concave or convex, have holes (including interior holes) and can co...
详细信息
暂无评论