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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!



More Geospatial Terminology Confusion

More Geospatial Terminology Confusion

3/6/2012

I was recently asked to clarify the difference between a coordinate system and a map projection.  This can be confusing, especially because some geospatial software (e.g., ENVI) handles unprojected coordinate systems exactly the same way that it handles map projections, without distinguishing between the two. The geographic coordinate... Read More >

Order of operations in an expression

Order of operations in an expression

3/1/2012

Given a floating-point array x, which of these two statements: IDL> y1 = 2.0 * x / 3.0 IDL> y2 = x * (2.0 / 3.0) executes faster, the first or the second? Note that both statements produce the same result to within floating-point precision. We can test the execution time of IDL code with the built-in SYSTIME function. Here’s an example... Read More >

Aligning widgets

Aligning widgets

2/23/2012

(Note:  Today, since I’m giving a webinar, we have another guest post by Jim Pendleton, an Advisory Consultant in the Exelis VIS Professional Services Group.  I indented his code for him. –MP) Working with IDL’s widget geometry can be challenging at times. There are many platform- and font-specific issues that often need to be taken into... Read More >

Extracting Building Features from LiDAR and Optical Data

Extracting Building Features from LiDAR and Optical Data

2/21/2012

As the availability of remotely acquired data continues to grow, high quality imagery is more accessible and less expensive than it was in previous decades. As a result, the need to incorporate remotely sensed imagery into GIS-based analyses continues to increase as well.  Further, LiDAR data can be combined with spectral imagery sources... Read More >

A cool visualization with (New) Graphics

A cool visualization with (New) Graphics

2/9/2012

Matt Trawick, an associate professor of physics at the University of Richmond, develops atomic force microscopy techniques for use in studying various nanostructures. He used C++ and IDL 8 to analyze his data and produce, with (New) Graphics, this visualization: Here’s Prof. Trawick’s description: The blue and yellow surfaces are two... Read More >

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