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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!



Displaying multiple axes with (New) Graphics

Displaying multiple axes with (New) Graphics

12/15/2011

Here’s a (slight hack of an) example of displaying two time series (5-min mean wind speed and wind direction), each with their own dependent axis, on a set of two independent axes (local time and universal time) using (New) Graphics (NG). For data, I’m using a netCDF archive file from the NCAR Mesa Lab (ML) weather station. Information about... Read More >

The COMPILE_OPT statement; you should use it!

The COMPILE_OPT statement; you should use it!

12/8/2011

The COMPILE_OPT statement alters IDL’s compile-time behavior. The statement is locally scoped; i.e., it changes IDL’s behavior only within the routine in which it is declared. I use the IDL2 option (a shorthand for the DEFINT32 and STRICTARR options) in all new procedures, functions and... Read More >

On the dangers of keyword inheritance

On the dangers of keyword inheritance

12/1/2011

IDL gives you the tools to write highly efficient code very quickly. It also gives you many, many opportunities to write very, very bad code. Here's one problem: "I love _EXTRA.  I use it everywhere in my code to cut down on my typing, but my applications run more slowly and sometimes I run out of memory for reasons that I... Read More >

A small, helpful routine

A small, helpful routine

11/21/2011

A small item this week because it's Thanksgiving. In DG, you can close all open windows with a statement like this: IDL> while !d.window ne -1 do wdelete, !d.window Here's my two-line equivalent in NG, wrapped into a procedure: pro windowdeleteall compile_opt idl2 w = getwindows() if n_elements(w) gt 0 then foreach i, w... Read More >

A cool visualization with Direct Graphics

A cool visualization with Direct Graphics

11/17/2011

Owen Kelley, a research scientist at NASA Goddard Space Flight Center and George Mason University, made this visualization of Hurricane Irene with programs he wrote using IDL Direct Graphics: Dr. Kelley explains that he’s created: “...an image of Hurricane Irene a few days before it hit North Carolina, using IDL to... Read More >

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