xm_wire

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


 Xmap8: 
        Three-dimensional GIS for Geology and Geophysics.


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.


     

Address:
  
      Prof. Jonathan M. Lees
      Yale Geology Dept.
      P.O. Box 208109
      New Haven, CT  06520-8109
      (203)432-6947
      lees@love.geology.yale.edu