Each week, Harris 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.



2 Feb

Base 60 encoding of positive floating point numbers in IDL

Atle Borsholm | Comments (0) | Number of views (534) | Article rating: No rating

Here is an example of representing numbers efficiently using a restricted set of symbols. I am using a set of 60 symbols (or characters) to encode floating point numbers as strings of any... Read More >

1 Dec

Optimizing Max Kernel Operation in IDL

Atle Borsholm | Comments (0) | Number of views (989) | Article rating: No rating

I found this optimization question on the comp.lang.idl-pvwave, and decided to give it a try. The question was to implement an algorithm that replaces every element in a 2-D array with its... Read More >

6 Oct

Minimizing Rounding Errors with IDL's TOTAL function

Atle Borsholm | Comments (0) | Number of views (1051) | Article rating: No rating

The idea for my blog topic this week came from a question from Ron Kneusel about the loss of precision using IDL’s TOTAL function. IDL functions are often implemented in a... Read More >

28 Aug

Upsampling images using a Lagrange polynomial method

Atle Borsholm | Comments (0) | Number of views (1137) | Article rating: 4.0

A few weeks ago I posted about using the Lanczos kernel for resampling images to a higher resolution. This week I am continuing with the same example, but adding in the Lagrange resampling... Read More >

7 Jul

Upsampling images with Lanczos kernel

Atle Borsholm | Comments (0) | Number of views (1311) | Article rating: No rating

Resampling images is a very common operation in IDL, and it can happen both implicitly as well explicitly. Implicit resampling happens with IDLgrImage rendering. When the destination rendering... Read More >

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