You may need to right click (or control-click) and
save or download the link to disk.
To install FOLD2DEM:
The f2d folder contains:
||Download FOLD2DEM (f2d.dmg). Click one of the
blue buttons (above).
||Launch (mount) the downloaded disk image file,
||Drag the f2d folder from the mounted disk image
to your hard disk.
||Unmount (eject) the disk image.
||Archive or dispose of the disk image file.
|Mac OS 9.1 and higher
|Mac OS 10.x
Note that FOLD2DEM is not rendering software. Models
produced by FOLD2DEM can be rendered using any TMF-capable rendering
software. The author uses 3DEM, software by Richard Horne
for Windows (95/98/ME and 2000), to render FOLD2DEM-generated
models. 3DEM is freely available from Visualization Software
Comments and inquiries regarding FOLD2DEM should be directed
to the author, J. Mies.
|FOLD2DEM is software for generating a
digital elevation model (DEM) of a surface in a simple upright
fold. The finished fold DEM is rectangular and is bounded on
opposite ends by digitally described cross sections. These end-member
sections must be of the same length and must employ the same
uniform horizontal distance between elevations in their digital
descriptions. FOLD2DEM performs linear interpolations between
corresponding values of elevation in end-member sections to fill
out the digital description of the folded surface with multiple
intermediate profiles. The number of intermediate profiles is
based on a spacing equal to that of elevations in digital descriptions
of end-member sections. The finished model is written to disc
as an ascii terrain matrix file (TMF) and can be rendered using
TMF-capable rendering software, such as 3DEM.
|Rendered DEM of Lookout and Pigeon mountains
and the McLemore Cove anticline (right). Observer is 10 km south
of Dougherty Gap (34.56°N, 85.45°W), 1,500 m above the
ground (2,000 m above sea level), and is looking north. Landscape
based on USGS 30-m DEM data for the Sulphur Springs, Cedar Grove,
LaFayette, Valley Head, Dougherty Gap, and Trion 7.5-minute quadrangles.
Geology interpreted from Cressler (1981). DEM of folded contact
between Mississippian and Pennsylvanian units (red surface) generated
with FOLD2DEM software. Both DEMs (terrain and folded surface)
rendered using 3DEM software by Richard Horne.
An 11 x 11 fold DEM matrix
The position of a particular value in the DEM matrix demarks
the position at which the elevation is modeled to occur on the
folded surface. Such a matrix can be envisioned as a series of
profiles. Appropriately oriented, columns of the matrix are longitudinal
north-south profiles; rows of the matrix are east-west profiles,
parallel to end-member sections. The DEM matrix is transposed,
north for south, due to the south-to-north ordering of the terrain
|Note positions of 190
(blue) and 274 (red) in the
matrix (above) and in the stick-and-ball model (right). Also
note the position of the longitudinal section (yellow) in the
model and in the matrix.