Points are described by the empty-element tags
<point/> with the
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
y = "..."specifies coordinate
z = "..."specifies coordinate
z, point height
fix = "..."specifies coordinates that are fixed in adjustment; acceptable values are
adj = "..."specifies coordinates to be adjusted (unknown parameters in adjustment); acceptable values are
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
parameter. When the coordinates are written using uppercase, they are
interpreted as constrained coordinates. If coordinates are marked
with both the
fix parameter will
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
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
gama-local allows the definition of
constrained coordinates with 1D leveling networks, 2D and 3D local
<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" />