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Technology Blog Articles

Each month, NV5 Geospatial posts new blog content across a variety of categories. Browse our latest posts below or use the menu on the right to filter posts by a specific category or author. Stay informed of the latest blog posts, news, events, technologies, and special offers by joining our email list. Sign up now!



Using (New) Graphics in an IDL widget program, part II

Using (New) Graphics in an IDL widget program, part II

4/12/2012

Last week, I demonstrated how to set up a widget interface that embeds an IDL 8 (aka New) Graphics (NG) window with the WIDGET_WINDOW function. This week, let’s see how event handling works in this program. (Get the full program here.) Start with the event handler for the slider widget: pro widget_window_ex1_index_event, event ... Read More >

Environmental Conservation and Geospatial Image Analysis

Environmental Conservation and Geospatial Image Analysis

4/10/2012

In his recent post, my colleague, Peter McIntosh wrote about the different markets where geospatial software provides solutions.   For many geospatial imagery users monitoring and quantifying change is a very important task.   Through my work with academic institutions and environmental organizations, I have noticed the same... Read More >

Converting an indexed image into an RGB image

Converting an indexed image into an RGB image

3/22/2012

Here’s an example of how to convert an indexed image into an RGB image. Though they require more memory, I often find RGB images easier to work with because I don’t have to deal with color tables: I invariably forget to read the color table of an indexed image or pass the color table to a display routine in IDL. Start by reading an indexed... Read More >

2012 ENVI User Group: COSI-Corr User Presentations

2012 ENVI User Group: COSI-Corr User Presentations

3/20/2012

At the 2012 ENVI User Group, Sebastien Leprince, California Institute of Technology, will be presenting “COSI-Corr: Principles of Sub-Pixel Correlation” and Francois Ayoub, California Institute of Technology, will be presenting “COSI-Corr: Application of Sub-pixel Correlation for Change Detection”. An orthorectified... Read More >

Using a hash as a widget state variable

Using a hash as a widget state variable

3/8/2012

The design pattern of a state variable in (procedural) IDL widget programming is used to communicate information from a widget creation routine to event handlers and other helpers. A state variable is typically implemented as a structure or as a pointer to a structure. Though both of these techniques work well, I’d like to show that a... Read More >

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