NAME xm_wire - Well format for the xmap8 program SYNOPSIS xm_wire - Input File Format DESCRIPTION This is the format for wireframe structures in xmap8. Wire frame structures are 3D objects made up of polygonal faces. The faces must be planar, but they can contain more than 3 points each. A wire from object is a set of these planar features. Defined in this fashion, they do not have to share sides: an object may consist of numerous polygons distributed in space. This format is redundant, but it allows for objects like torn faults (not-connected) and other nice geological goodies. The format comprises a list of faces: each face may have any number (>3) nodes, and each face has its own color. Format: Format for wire-frame objects: You can have up to 10 files. Each file can have unlimited number of polygons. Each file starts with an alpha-numeric 50 character name followed by the number of polygons included in file. Each polygon starts with the integer number of verticies (must be > 3) and an integer color index (associated to the color map described in manual) Following this are the 3-vector index loci: Lat Lon Depth (Lon is always positive east, depth is always positive down) Polygons must be planar: weird results will result if this convention is not followed. The polygons do not have to touch or be contiguous. This means there is some redundancy (duplicate verticies) but provides extra flexability. For example, you can have a torn fault described by two rec- tangular, non-touching, planes. The following example file includes a a west dipping rec- tangular fault surface (white) and a south-west dipping tri- angular fault (red). Input Example (Joshua-Tree/Landers region): Prototype: name number_of faces NUmber_of vertices Color lat lon depth E.G.: JT-Land 2 4 1 34.237736 -116.475243 1.0 34.050205 -116.475243 1.0 34.050205 -116.585548 12.0 34.237736 -116.586678 12.0 3 2 34.380188 -116.839554 0.0 34.271999 -116.668556 0.0 34.201675 -116.890617 10.0 SEE ALSO xmap8 xm_color xm_hypo xm_map xm_menu xm_origin xm_points xm_raster xm_station xm_well xm_wire xm_xsec xm_ellipse
REFERENCES see article by J. M. Lees: Lees, J. M. (1995) Xmap8: Three-dimensional GIS for geology and geophysics, Seismological Research Letters: 66, 33-37.
Prof. Jonathan M. Lees Yale Geology Dept. P.O. Box 208109 New Haven, CT 06520-8109 (203)432-6947 lees@love.geology.yale.edu