How to generate a Rectangular Grid
See
about Rectangular Grid in the SPRING
Generating a Rectangular Grid :
-
make sure that an IL of the numerical model was created previously
having samples (points and/or contour lines), which were edited or
imported, or a rectangular or triangular grid;
-
activate in the "Control Panel"
the Information Layer that has the data (samples or grids)
for the rectangular grid generation;
-
click on DTM - Rectangular Grid Generation...
in the main menu;
-
in Input: click on the representation that will originate the grid: Sample
(points and/or contour lines), Grid (rectangular grid) or TIN
(triangular grid). The system enables only the representation(s) associated to
the input active IL;
-
type the Output Layer name that will have the grid. By "default"
the system presents the active IL name. If desired generate a grid with an bounding
box and/or resolution different from the source layer, type
another name for the output IL;
-
click on the Bounding Box... to
generate a grid for a smaller geographical area than the active IL whole area.
In this case another IL name has to be provided (see more details about how at
changing the bounding box);
-
give the grid Resolution
in X(m) and Y(m). The resolution presented corresponds to the value defined
during the numerical IL creation or during another interpolation process. If an
active IL different resolution is desired, it will be required to change the
output IL name.
- set number of bits for the Output grid, the user can choose between 32 or 64 bits;
-
select the Interpolator. The available options will depend on the input IL representation selected above.
- If the option is Samples the available interpolators are:
Weighted Avg./Z Value/Quadrant; Weighted Average/Quadrant; Weighted Average; Simple Average; Nearest Neighbor;
Bilinear Spline; Bicubic Spline; Mitasova Spline
- If the option is rectangular Grid, the available interpolators are:
Bilinear; Bicubic
- And if the option is TIN for the rectangular grid the interpolators are:
Linear; Quintic without breaklines; Quintic with breaklines
-
click on Apply to generate the
rectangular grid.
NOTE: After generating a rectangular grid in the IL of the numerical
model, it will be available in the "Control Panel".
To visualize the grid just activate the IL that has the grid and select the Grid
representation in the panel.
To avoid the points presentation saturation in the window, the system makes the
resample, showing only part of the points. In case several scale applications
will be applied with the area cursor (
) or Zoom In (
), it is possible to see all points of the amplified area. The figures below
show the samples from a numerical IL and the samples from a grid of the same
area.
NOTE: If desired the user can change the visual aspects for the grid
presentation; click on Edit - Infolayer in the main menu,
select the Grid representation of the numerical IL and click on
Visual...
to make the changes.
See also:
DTM Products in the SPRING - What are they and how to execute
them?
Editing numerical maps
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