A Tale of Two Pixels: Nodata and Transparency in GeoExpress

GeoExpress is a software package that provides image compression technology for converting raw imagery into the compressed MrSID format. Not all MrSID files are created equally, however, which makes understanding the differences between them very important. MrSID Generation 3 (MG3) files are a legacy format still used by many GIS applications. MrSID Generation 4 (MG4) is the newest file format available in GeoExpress. MG4 files offer many benefits when using…

Why are Pixels Missing in my Image?

When I convert raw data to a MrSID file there are many areas within the image that are the wrong color. Here is the raw image: And here is the compressed MrSID: Some explanation of how GeoExpress and ArcMap handle nodata is in order. To learn more about missing pixels in your MrSID image, visit the LizardTech Knowledge Base. To find out more about GeoExpress and MrSID, click here.

MrSID Compression and Despeckling

Despeckling in MrSID Compressed Images

Speckling artifacts happen because compressing images to MrSID at high compression ratios requires approximating colors. In other words, “black” becomes “almost black.” While the human eye doesn’t ordinarily notice the difference, this can make it difficult (not to mention ugly) to mosaic images together. Speckling also happens with other background colors depending on the nodata value. To learn more about despeckling and why this happens, click here to visit the…

National Security Depends on Useful Information in the Hands of Diverse End Users

The term ‘National Defense’ conjures up notions of an army, navy and air force ready to protect the homeland from organized military or loosely affiliated rebel aggressors. In today’s complex world, however, this term has widely been replaced with the blanket title of ‘National Security’ due to the many activities that national governments now undertake to protect their homeland, citizens and critical infrastructure, not to mention their agriculture, energy, economic…

Express Server 9.0.7 Now Available

LizardTech issued a patch for Express Server this week, the fast and simple image-delivery server for MrSID. Express Server 9.0.7 is now available! This patch release addresses two main things: 1. Users can now install to the website of their choice (not just the default website) 2. Fixed a bug that was causing a server crash in some cases You can learn more about the patch release on the LizardTech…

As UAS Technology Evolves, MrSID Playing a Key Role

In case you’ve somehow missed the news, the mapping business is undergoing one of its biggest disruptions since Landsat thanks to the proliferation of those little unmanned airplanes and helicopters that are probably flying over your house right now. Depending on who you ask, there are literally hundreds of legitimate commercial companies building and selling those products around the world. The mapping sector of the geospatial industry isn’t the only…

In Energy Sector, Compression Helps Keep the Hydrocarbons Flowing

Here’s a shocker – Industries that use a lot of raster data are also big users of LizardTech products. And oil & gas extraction and other energy-related industries definitely fall into that category. A subset of the overall energy sector, oil & gas clients rely on our compression technology in just about every phase of their work from exploration and production to transmission and distribution and eventually operation closure. We…

Transportation Agencies Compress, Manipulate and Serve Immense Data Sets with LizardTech Products

The agencies responsible for building and maintaining transportation infrastructure are difficult to define. There are vast differences from agency to agency in terms of reliance on design engineers and construction contractors. There is no ‘typical’ transportation department. A quick review of our LizardTech transportation clients in the US and Canada finds most reside at the state and provincial levels. Some deal only with roads and highways, while others manage maritime…