About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 68 (1984)

Issue: 4. (April)

First Page: 486

Last Page: 486

Title: Contour Previous HitMappingNext Hit Previous HitUsingNext Hit A Microcomputer--Techniques for Improvement: ABSTRACT

Author(s): Mark A. Herkommer

Abstract:

There are 3 basic steps to contouring by microcomputer: control-point data analysis, generating a regular Previous HitgridNext Hit of estimated values, and contouring. Because each of these steps requires a significant amount of time and computer resource, techniques have been developed to improve Previous HitgridNext Hit parameter selection, speed gridding, and edit computer-generated contour maps. Previous HitGridNext Hit cell size is a critical parameter used during the gridding stage of computer Previous HitmappingNext Hit and must be selected with consideration given to control-point distribution. A histogram showing control points per Previous HitgridNext Hit cell is a simple graphical presentation that illustrates before gridding is actually performed the effectiveness of the selected Previous HitgridNext Hit increment in producing the desirable Previous HitgridNext Hit characteristics of having one co trol point per Previous HitgridNext Hit cell. Gridding is accomplished in 2 steps at every node: gathering the control points for estimating, and actual calculation. Previous HitUsingNext Hit collection and estimating techniques such as nearest-neighbor searches and inverse-distance moving weighted averaging, several thousand nodes can be calculated in a few minutes. Often, the generated Previous HitgridNext Hit (contour map) is satisfactory with exceptions in 1 or 2 areas. Previous HitUsingNext Hit an interactive computer technique known as contour editing, geologic knowledge and experience can be infused into the map. When editing contour, the computer mapper indicates the way the contours should behave. The entered values are then used to calculate back to the Previous HitgridNext Hit nodes (without regridding the whole map area) so that when the Previous HitgridTop is recontoured, the contours mi ic the contour revisions.

End_of_Article - Last_Page 486------------

Copyright 1997 American Association of Petroleum Geologists