Open CAD Tools, gvSIG editing tools

It has been launched a series of interesting features, which come from the contribution of CartoLab and the University of La Coruña. gvSIG EIEL involves different extensions, very useful indeed, both for managing users from the gvSIG interface, custom forms and automatic validations.

Gvsig eiel

But what struck me most is Open CAD Tools, which in its version 0.2 seems to take up many requests from the community to concentrate and improve the routines of building and editing data.

Gvsig open cad tools If something gvSIG has, that we like to GIS users are its creation tools in the style that we usually do with CAD programs, it has practically everything that we question about specialized GIS programs. By installing this extension, extCAD is replaced by default. The user manual explains how to install only the extension, because it also comes as an executable even with an old version of gvSIG.

They are grouped in the option to insert the following 11 commands: Point, Multipoint, Arc, Polyline, Multipolline, Multitasking, Multipolygon, Regular Polygon, Rectangle, Circle, Ellipse and Autopolygon.

While in the Modify the following 16 commands: Copy, Symmetry, Rotate, Scale, Explode, Scroll, Edit vertex, Add vertex, Remove vertex, Merge, Redialize line, Cut line, Cut polygon, Redigitalize polygon, Internal polygon and Stretch .

In total 27, of which I remember Have accounted for 21 when doing a comparison of the AutoCAD commands against those of gvSIG 1.9.

Gvsig open cad toolsWhat is the most valuable thing about Open CAD Tools 0.2

For starters, I find the functionality Right mouse button, once a command is started it can work as "undo". It seems very practical, because when you are drawing a geometry, for example a polyline or polygon, it is common to make an error when placing a point; instead of canceling the work done, or continue to later edit ...

Right button, and the last point placed is erased

Also, there are some keys that help with the job, Like the "tab", which allows you to navigate to a next element. It occurs, for example when we edit a complex geometry, as in the case of a polygon that has gaps, or multiple polylines.

Tab key, and takes us to the next geometry

Then there is the space bar To finish the job and the letter C to cancel. While there are those who archaically question the use of keyboard at this point, as shortcuts in the middle of a command are still practical.

Gvsig open cad toolsThe routines to redigitize line and polygon solve this great limitation when doing maintenance to geometries already created. Although, a lot of this comes with gvSIG, the extension they have made to the routines is very good, for example, when a line or a polygon is cut, the message asking if we want to keep the remaining segment.

So, replacing the default tools with Open CAD Tools is a viable option. The only tool that is not found is the Line command, because it is created with the Polyline command, understanding that it only has one segment.

Other improvements are in the configuration of snaps properties, in order not to affect the speed of the machine. For this you can modify the number of geometries for analysis, the layers and if the tracking is done only to vertices or edges.

Then, the option to activate NavTable automatically when finishing a geometry. With this, the alphanumeric data could be completed in the same line of the production process. Although the biggest highlight of this, is that the completion of the geometry is now an event, with which the programmers can do other types of associated tasks:

  • As a review of topologies on a spatial basis,
  • Lifting a triger announcing the change to the database even though the vector layers are not on a spatial basis,
  • Or simply by notifying a database that a specific geometry already exists and that it proceeds to report integrity with respect to tabular data. As it can be the case when the card has been digitized but the mapping goes slower.

It will not be strange to see this extension in the next version of gvSIG, as we saw it with NavTable. We think it's a good example, that together Fonsagua Represent results of the work that the Foundation has been maturing in the formation of that industrial fabric that is one of the strong pillars for the sustainability of the Open Source platforms.

To follow up on this topic I suggest the following links:

And then this video to see the use of EIEL in the road layout.

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