For some time has been implementing different applications to technology LiDAR (Light Detection and Ranging) which consists of remote measurement of the ground by means of a laser system. According to the existing information in DIELMO, currently the LiDAR airborne Is the most accurate technology for the generation of digital terrain models with 1 or 2m for spatial resolution of large extensions of terrain, with a height accuracy better than 15cm and performing a real XYZ measurement for each square meter.
In the recent days gvSIG was presented a free extension called DielmoOpenLiDAR that incorporates gvSIG the ability to manage and view LIDAR files in formats .las and .bin, always with the intention of not killing the computer resources, while being able to visualize at the same time large volumes (hundreds of GigaBytes) of raw LiDAR data (cloud of irregular points in LAS and BIN format) overlaid with other geographic data in gvSIG.
DielmoOpenLIDAR allows to apply automatic symbology according to height, intensity and classification from the frame of the view. Once the extension is installed, you can configure the point size according to pixels, so that when you are far away you will not see a spot and as you get closer you will see bigger ones.
Thus When loading new layers the required extension for LIDAR files can be activated.
Classification according to height:
Here it shows this functionality, see how you can differentiate by height the tree from the building of the natural terrain according to the properties configured for symbolization.
Classification according to intensity
The graph shows the same view, but classifying by intensity according to parameters defined by the user.
This application was developed by DIELMO, from its page you can download extensions for different operating systems, user manual and source code.
By the way I take advantage to promote this company that offers in addition to its services, very good information on LIDAR technologies, some links to online resources and free products.
|Digital terrain models||Digital mapping|
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