Anadelta Tessera / Corridor Planning

    • Main road features

      The user can create and process an unlimited number of roads. For every road and in every stage of a project, any of the default parameters such as the design speed, initial widths, superelevation rate calculation mode, regulation types, etc. can be changed.

    • Corridor definition and editing

      The corridor can be defined in many ways: visually by using the mouse, by importing data from a text file or by typing the coordinates by hand on a table.

      When inserting the axis visually, the program's capability to snap to any design objects (lines, curves or characteristic points) can greatly assist the user. Tessera suggests initial values for the transition curve properties. The computed geometry of the road bend is continuously displayed on the screen, along with additional information such as radii, bisectors, circle centers, as well as starting and ending points for all curves (clothoids, circles, parabolas, etc). In case of overlapping curves or invalid parameters Tessera alters the shading on the problematic areas in order to alert the user. After the editing, if the problem still persists, an informative warning or error message is displayed.

    • Transition curves

      Every corridor vertex is a composite object consisting of a set of properties such as its coordinates, name, superelevation rate at the bend and type of transition (clothoid-circle-clothoid, parabola-circle-parabola, etc). For every structural element mentioned above, the program suggests default values (radii, lengths or spiral constants) as well as range limits.

    • Vertex conjunction - composite curves

      Composite curves can be constructed by joining two consecutive road vertices, which the program can then manage as a single object. This category includes the hairpin bend and the sequence clothoid-arc-clothoid-arc-clothoid. In that case the program calculates all the parameter values which the user can then modify at will. If the user chooses to edit a parameter, Tessera recalculates the rest in order to produce the unique solution. This also applies during the visual editing of composite bends. This on-the-fly calculation of the central clothoid is a very useful tool.

    • Sidelines - Widenings

      Tessera displays the corridor sidelines according to the initial widths of the carriageway, shoulders and any islands specified by the user. The user can visually modify the carriageway or the roadway width at any position along the road. Such widening or narrowing is an intrinsic property of all sidelines, which means that it is persistent with respect to any changes of the road axis. The real-time update of the road geometry during visual editing allows for an easy adjustment to the terrain layout. The program supports an extensive array of widening functions (e.g. widenings on bends, linear and cubic parabola widenings etc). They can be used for modifying the width of any road surface. Depending on the type of the function, the user can specify the width, length, or curvature radii.

    • Superelevation rates

      The road superelevation rates are displayed on a diagram along with a lot of additional information (curvature diagram, road bend cardinal points). On this subject, both the German (RAS) as well as the American (AASHTO) regulations are supported. Although the superelevation rate calculations are highly parametric, a diagram can be created by simply importing the relevant data from ASCII files. The user can define the superelevation rates along the road straights and the circular arcs, the limits of all supplemental sideline slopes, as well as other parameters such as the application threshold between any two consecutive bends with opposite direction. Any parameter modification is instantly reflected on the graphical representation of the diagram. In the same manner, the user can modify any aspect of the road geometry that the superelevation rates diagram depends on and immediately view the results.

    • Cross section setting out

      The cross sections are placed along the road according to user-specified parameters. The program offers a variety of alternative methods concerning cross section placing. In addition to the distance between cross sections on road straights and bends, the minimum distances at the end of each structural element as well as from cardinal cross sections can be defined. The definition of characteristic cross sections is optional. The program can also automatically adjust the cross section placing in order to better match the underlying terrain structure or to make it piecewise symmetrical. After each modification to the corridor plan, all cross sections are updated accordingly. Additionally, the user can visually place new cross sections as well as move existing ones to a specific position along the road axis. Finally, the positions and the names of all cross sections can be imported from external files of various types.

    • Vertical Alignment

      Right after placing the cross sections in Horizontal Alignment, we can query the TIN for the underlying natural ground data. The road profile can be either inserted visually by using the mouse, or imported from either a table or a text file. Along with the curvature radii, it can also be visually modified, while Tessera uses the display colors to alert the user on any problematic areas. In addition, it displays a wide variety of information on the editing window, such as the vertical distance from the natural ground, the slope of the road tangent curve and the natural ground, the curvature diagram, the superelevation rate diagram, etc. A notable feature of the program is the capability to automatically reform the road profile after any Horizontal Alignment modifications, thus minimizing the amount of manual changes required.

    • Drainage inspection

      After completing defining the Horizontal and Vertical alignment and fine- tuning the superelevation diagram, Tessera can calculate and display the rainwater drainage rate throughout the road surface. The user can specify a color scale that will be used for this purpose. In that way the problematic drainage areas can be identified and corrected.

    • Bruckner Diagram

      Once the quantity table has been calculated, Tessera can produce the surface diagram as well as the Bruckner diagram. By means of a specialized editing environment the user can insert distribution lines, optimize their position as well as calculate and print the earth mass moving table in order to calculate the excavation and transfer cost.

    • Visibility

      Tessera can calculate the required visibility distance according to the per-element calculated V85 speed. Based on this quantity it can compute the required roadside space and draw the visibility curves. In addition, when the existing space is smaller than required it can automatically apply any modifications needed to improve visibility. Finally the existing sight distances according to the Horizontal and Vertical alignment can be determined and a report can be produced separately for each direction, along with the percentage of the road for which the existing visibility range is larger by a factor than required.

    • Structures

      Tessera greatly simplifies structure creation and insertion. A structure can be defined either by typing its parameters, or graphically by using the mouse. Its type, position, dimensions, axis of orientation, sides and wing walls are fully customizable. Structures can be inserted while working either in the Horizontal Alignment or the Profile workspace. Upon its creation, all other views will be automatically updated.

    • Capabilities of the Professional Edition:

    • Multiple terrain models - Volumetric calculations

      Tessera supports the coexistence of many TINs in the same project. Each TIN can represent a different layer or even a set of points without elevation data (which we may wish to subsequently retrieve from a separate triangulation). Every terrain object has its own computational parameters (e.g. elevation range, contour dimension, breakline insertion, maximum triangle side length), as well as rendering settings (wireframe, relief shaded, colored, etc). Tessera can also calculate the exact volumetric difference between two terrain objects or between an object and a user-defined plane.

    • Wider range of transition curves - Composite curves

      In addition to the standard transition curves used in road construction, such as circle-clothoid-circle, the Professional Edition offers parabola curves, tailored specifically for railroad planning, as well as more complex compositions (clothoid-arc-clothoid-arc-clothoid, etc.). Tessera will automatically calculate values for all curve parameters in order to produce a solution. The user can choose to modify any of the suggested values, in which case the software will adjust the other inputs accordingly. This can also be done in real-time, while the user graphically moves any of the two bracketing PIs with the mouse. The calculation of especially the egg-shaped curve while a road PI is being moved in real-time is a very useful tool.

    • Intersections

      The Professional edition of Tessera suppports the automatic insertion and management of intersections. Their specifications include all the design parameters for left-turn lanes, decceleration lanes, central medians, isolation zones, channelizing islands and triangular entry and exit islands. Modifying any parameter (length, width, radius, calculation method, etc.) either by keyboard entry, or visually by using the mouse, will automatically lead to a complete recalculation of the entire structure. At the same time, descriptive information messages (or warnings when appropriate) will be produced and displayed. Every recalculation is followed by the automatic update of all elements related to elevation, width and slope transitions. After cross section calculation all intersection sidelines and sideslopes are drawn.

    • Interchanges - Divergences / Convergences

      The easy, user-friendly automatic creation of interchanges is one of Tessera's strong points. The user can insert a new convergence or divergence via a multitude of methods. Acceleration lanes can be automatically inserted. For each converge or divergence, Tessera selects the appropriate auxiliary lane configuration parameters (width, length, length of transition curve), entry / exit angles as well as the characteristics of all relevant branches (widths, curvature radii, transition lengths) by consulting the specifications provided by the user. The software can perform automatic main road / branch cross section synchronization, as well as width, superelevation and profile elevation adjustments. Finally, composite cross sections can be created when necessary at area of the interchange.

    • Interchanges - Loops, Direct ramps, etc.

      By combining divergence and convergence elements, connective branches of any kind and geometrical shape can be constructed between two roads. In addition, based on user preference, Tessera can also insert loops and direct ramps in the crossing areas between two roads. There is also the capability of merging two branches into a unified road, which can in turn intersect a third road, coming either from the same or from a different elevation, like in a trumpet interchange. Once again, all connective branches, no matter how they have been inserted, can be modified either by changing their parameters in the interchange specifications table, or visually by using the mouse. Any modifications are followed by superelevation and profile adjustments.

    • Side network - Composite cross sections

      Side network cross sections can be synchronized in a way that they will constitute extensions of those on the main branch, thus resulting in composite cross sections. One part of a road's cross sections can be defined based on those of a main road, a second part based on those of a third road and the rest based on its own parameters. This is automatically done for the branch cross sections near intersections.

    • Composite cross sections

      Creating composite cross sections along the entire road is something that can be done easily and efficiently with Tessera. After creating and editing the cross sections for each road independently, the composite road's cross sections are automatically created. The user can specify the road calculation order, as well as choose between creating a single, unified artificial ground or multiple ones. After this stage, the composite road can be treated as a simple one, which means that all processing, editing and printing functions are supported. This includes every drawing as well as the mass table. Finally, the constituent roads' cross sections can be retro-actively updated so that the Horizontal Alignment workspace can be kept synchronized.

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