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Import point file

Command: PIMPORT

Description

With the command PIMPORT (from file) point files that are in ASCII-format, can be imported into the drawing. In this process the Point set is generated automatically.


Procedure

  1. After starting the command specify a file from the selection dialogue.


  2. In the following dialogue the import type for the levels can be specified: in the top row the name of the selected file is displayed. With the option Point format the desired format can be selected (X-value = value to the right / Y-value = value up / Z-value = altitude / description).

    Please note that landscape gardeners usually maintain the order X, Y, Z, but surveyors on the other side use the order Y, X, Z.

  3. Because there can be files that have either points or commas as decimal point this can also be setup. For this, the content of the file is displayed.


  4. Especially, if there are point files that are very large and contain a lot of information but lie outside the area needed there are further filter options available.


  5. In the section Area there is a setting to import only point information that lies within a certain area. If the lines for the limit of works are already drawn the option Existing polyline can be useful and the area can be specified with On-Screen.
  6. In the section Reduce the point set can be reduced if it contains an unmanageable number of points (point clouds). If the distance between the points is smaller than the specified Minimal point distance the points are deleted accordingly. If the value is greater the point will be retained in the point set. Furthermore, there is the option to import any X. point from the Ascii-file.
  7. In the tab General the option visible is activated. The point information is saved to the drawing data base and becomes available for future work, e.g. for the generation of triangulations. If the points are to be set invisible at a later stage, this can be done in the Quick-DTM. If the points are visible, the program zooms automatically to the extends of the point set after it was imported.


  8. With [OK] the points are imported into the drawing and a point set is created.

Method

Before importing the points it will be checked whether double points are included in the file. These are points, with identical X- and Y-coordinates. Those entries are not permitted, because at one point of a terrain, there cannot be different heights. If there are doubled points, they will be filtered out automatically. This information is displayed in the tab Import > tab General.

If a lot of double points are listed, this also can be a hint, that a incorrect point format was chosen for this import.

If the point set provides a Point number and imported with the Free format option (see chapter Using the Free Format), these point numbers will be used in the point set.

Point label (Tab Layout): The points can also be labelled with the coordinates of the current coordinate system (UCS-Coordinates). The label is also exported when Data transfer to Excel, to an ASCII- or CSV-file. This function is required, for example, when pegging out with a Leica total station.

Next steps

Using the Free Format

In the event that the present point set file is not the specifications of the prefabricated point formats a free import format can also be defined. For this, select in the tab Import > tab General > Point format Free Format and the tab Free Format is opend.

At the first start the file will be analysed and the entries are sorted on the basis of separators (space, tabulator, comma, or semicolon) in the Mode > Columns into the respective columns depending on the selected format.

Provided the point set contains a point number and the column is allocated to the point number (e.g. Format_Standard_IXYZ) these point numbers are applied to the point set.

Another alternative can be found in the option Mode: If Symbol is selected a column can be defined through the field length. This gives the ability to import files in which separators were not used.

For this, mark the column and specify in Range to be imported in the field From Symbol the start value and To Symbol the end value within the row.

Once created format settings can be secured for the following imports.


Information on the file format of ASCII-point sets

In the point rows of the ASCII-file the point specifications have to be separated from each other (space, tabulator, comma, or semicolon). Each point is described in a text row. Each point column must contain no more than 255 characters.

The order of coordinates and additional information (e.g. a comment on the point) within the point row is free, but is has to be identical for all point rows to be imported in one process.

At the end of a coordinate row any comment text may follow.

If the comment sits not at the end of a point row, but somewhere within, it has to form a word. The separators mentioned above must not be used in the comment. Apart from that, all other characters can be used in any order.
Example: Point23, Point_23.

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