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Points are described by the empty-element tags <point/>
with the
following attributes:
id = "…"
is the point identification attribute (mandatory);
point identification is not limited to numbers; all printable
characters can be used in identification.
x = "…"
specifies coordinate x
y = "…"
specifies coordinate y
z = "…"
specifies coordinate z
, point height
fix = "…"
specifies coordinates that are fixed in
adjustment; acceptable values are xy
, XY
, z
,
Z
, xyz
, XYZ
, xyZ
and XYz
.
adj = "…"
specifies coordinates to be adjusted (unknown
parameters in adjustment); acceptable values are xy
, XY
,
z
, Z
, xyz
, XYZ
, xyZ
and XYz
.
With exception of the first attribute (point id), all other attributes are optional. Decimal numbers can be used as needed.
Control coordinates marked using the fix
parameter are not
changed in the adjustment. Uppercase and lowercase notation of
coordinates with the fix
parameter are interpreted the same.
Corrections are applied to the unknown parameters identified by
coordinates written in lowercase characters given in the adj
parameter. When the coordinates are written using uppercase, they are
interpreted as constrained coordinates. If coordinates are marked
with both the fix
and adj
, the fix
parameter will
take precedence.
Constrained coordinates are used for the regularization of free networks. If the network is not free (fixed network), the constrained coordinates are interpreted as other unknown parameters. In classical free networks, the constrained points define the regularization constraint
\sum dx^2_i+dy^2_i = \min.
where dx and dy are adjusted coordinate corrections and
the summation index i goes over all constrained points.
In other words, the set of the constrained points defines the
adjustment of the free network (its shape and size) with a
simultaneous transformation to the approximate coordinates of selected
points. Program gama-local
allows the definition of
constrained coordinates with 1D leveling networks, 2D and 3D local
networks.
<point id="1" y="644498.590" x="1054980.484" fix="xy" /> <point id="2" y="643654.101" x="1054933.801" adj="XY" /> <point id="403" adj="xy" /> |
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