LanDTM: The world in your hands!

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Start-up Guide

I'll try here, in a few words, to explain how to make a first triangulation with LanDTM.

The program is divided in two main dialog boxes, first, the "graphic window" where you'll see drawn the cloud of points, the triangulation lines, the contour lines separated in 'contours' and 'directors', the boundaries, (they are limits or fences for a future use with inclusion/exclusion tools), Triangles without adjacents, (neighboring triangles) and break-lines.

And second, the "data window" where you'll see all the job numerical data, separated in groups, which they are called "DTM points", "DTM lines", "Break-lines", "Boundaries" and "Contour lines". From here I'll call to these two main dialog boxes as "graphic window" and "data window".

In the graphic window all the objects can be activated or deactivated for visualitation configuring the graphic, with the "View/Configure graphic" option in the main menu, and if you have many points you must use it to deactivate any objects so the update\regeneration of the graphic is'nt slow.

When I begin a job I open the 'data window' and I decide the data to input in. Normally, I've the data drawn in the CAD, as points, lines and polylines; and in this data window I can import points, lines or polylines easily, and too I've other ways to import them. On the rigth of the data window there is a 'combo box' with the ways which I can import the data, for drawn points in teh CAD to a coordinates file.

Then, I import my data in the data window, first the points, after the break-lines and finally, if necesary, the boundaries.

It's important to bear in mind the imported data must have elevation, Z coordinate.

When I've finished to import and check the data in the data window I go to the "graphic window", and to its main menu I select the "Edit\Create the DTM" option.

The arising dialog box has many options to calculate the DTM, but we need only to input a 'Maximum length of the lines" value; this option is here to avoid very long lines in the limits of the working zone. You can try to change it, with differents values, to go seeing the result. If you have break-lines, this option is important to optimize the calculation, but if this is'nt the case, only it's useful for the program does'nt draw very long lines and after you'll have to delete them by hand.

If you want, here you can create the contour lines, marking the 'Create, also, the contour lines' check box with which you'll be able to select a equidistance value and, too, to select 'each how many curves create the director curve'. If you don't want to create the contour lines you'll be able to create them later on with the 'Edit/Create contour lines' option in the main menu.

After, you can draw the contour lines of two ways, first, without smoothing, 'Draw/Curves without smoothing' option on graphic window main menu, with this you'll see the contour lines on the drawing as 'LWPOLYLINE's, and second, if you want to draw the smooothing contour lines, you must select the 'Draw/Smoothing curves' option on the graphic window main menu, and you'll see them as 'CurvaDeNivel' entities. These smoothing contours are necesary if you want, later on, to label them.

You can modify some parameters to the smoothing contour lines have a certain look; it can be, optimize them by distance and angle, changing the smoothed level, etc.

PProtopo always may be loaded in the CAD if you want to work with 'PPuntos' and 'CurvaDeNivel' entities.

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