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Product Review: GeoExpress 5.0 with MrSID by LIZARDTECH

Tuesday, February 1st 2005
Classified Ads:
Distributor
LIZARDTECH
1008 Western Ave.
Suite 200
Seattle, WA 98104
www.lizardtech.com/products/ geo
206-902-2839

Pricing
GeoExpress Unlimited Standalone* $7,900
Unlimited MrSID and JPEG 2000 encoding and powerful image manipulation tools

GeoExpress Encoding Bundles*
Level 1 - 100GB of annual encoding $2,900
Level 2 - 500GB of annual encoding $3,900
Level 3 - 1TB of annual encoding $4,900

GeoExpress Lite $1,500
Powerful image manipulation tools for existing MrSID or JPEG 2000 imagery
No encode capabilities for a low cost, high power edit-only station

*Includes 1 year support/maintenance

System Requirements
Minimum System Requirements
  • 500 MHz Intel Pentium 3 CPU
  • 128 MB RAM
  • CD-ROM Drive
  • Windows systems require .NET framework installed running GeoExpress

Introduction
GeoExpress 5.0 with MrSID from LIZARDTECH is a digital image manipulation program for viewing, extracting, and compressing large raster files. GeoExpress includes the Multi-resolution Seamless Image Database, MrSID, a wavelet-based image encoder. What is a wavelet-based image encoder? Basically, "wavelet-based coding provides substantial improvements in picture quality at higher compression ratios." Encoders such as JPEG "degrade at low bit-rates mainly because of the underlying block-based Discrete Cosine Transform (DCT)," according to this report published by the Association for Computing Machinery. The purpose of the software is to:
  • Prepare imagery to be compressed and viewed by others (GeoExpress View is a program for sharing images)
  • Create mosaics of a common projection
  • Create images to be used to be imported by geographic information system or image processing software.

Background
LIZARDTECH released GeoExpress 5.0 on January 10th citing several new enhancements to the product including:
  • Image reprojection that enables users to reproject imagery from one coordinate reference system to another.
  • Area of interest encoding is also available which allows users to specify different compression ratios within one image or mosaic to highlight a particular area in rich detail or obscure, a particularly sensitive area while preserving the surrounding area in vivid detail.
  • Pre-defined image profiles (NPJE, EPJE) that ensure compliance with Department of Defense image standards.
  • User-defined JPEG 2000 image profiles can be created to ensure consistent results across a project.
  • Multi-band support.
GeoExpress 5.0 with MrSID Product Functionality

GeoExpress' interface allows the user to open several raster file formats including .TIF, GeoTIFF, band interleaved (.BIL), ERDAS, JPEG and JPEG 2000, Sun Raster, DOQs, and of course MrSID as well as a few others. Upon recognition of the file format, the image properties are displayed (See Figure 1). To encode non-MrSID images using the wavelet compression technology, a user would select the output encoding format (MrSID Generation 2 or 3, or JPEG 2000) as well as several other options for the encoding ratio. The image can also be encoded "losslessly." According to the report cited above, "In lossless compression schemes, the reconstructed image, after compression, is numerically identical to the original image. However lossless compression can only a achieve a modest amount of compression. An image reconstructed following lossy compression contains degradation relative to the original. Often this is because the compression scheme completely discards redundant information."


Prior to encoding, GeoExpress 5.0 contains a Preview window to view the image, which can be cropped to user specifications (See Figure 2). This allows the user to only select a those areas of greatest interest to be shared with others. Alternatively, several images of varying projections can be loaded so that a mosaic can be created and output to a compressed format. Figure 3 is an example mosaic from the Seattle Washington area.


A very useful feature of GeoExpress 5.0 is the ability to degrade certain areas of the output image in order to conserve space (See Figure 4). Where a specific region of the image is of importance only, that area can be preserved in its full resolution. LIZARDTECH believes this features is of great interest to certain military and intelligence applications where "classified" areas can be obscured from view.

For users looking to decide which version of GeoExpress to acquire, a table of product functionality is provided below:


GeoExpress Product Family GeoExpress GeoExpress Lite
MrSID Encoding Yes No
JPEG 2000 Encoding Yes No
Image Cropping Yes Yes
Image Reprojection Yes Yes
Multi-resolution Mosaicking Yes Yes
Highlight areas of interest Yes Yes
Standard and User-Defined JPEG2000 Image Profiles Yes Yes
Tile Updating
Yes Yes

Reviewer Comments
The product performed as stated in the documentation and the processing time on 70 megabyte image to isolate an area compressed to 3 megabytes was relatively speedy with a 3 GHz Pentium 4 processor. The product is not entirely intuitive and an intermediate understanding of image processing is recommended. The preview and crop features were excellent and the user interface to perform the necessary encoding options were straightforward. Reprojection of a 15 Mb cropped image from a mosaic of Seattle (182 Mb total file size) took 34 seconds; the resulting, encoded MrSID image was 768K.

Trial Version
Users wishing a trial version of this product can download a copy here.

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Recent Comments

Journal News Removes Interactive Gun Permit Map

The Lower Hudson Journal News has been under fire for publishing a map of gun permit holders in two counties in New York State  before Christma. (APB coverage 1, 2, podcast). On Friday January 18 the paper removed the interactive map. Why? Publisher Janet Hasson gave answers in a media statement and in a letter to readers.

In a statement in response to The Poynter Institute (a journalism school) she argued:

With the passage this week of the NYSAFE gun law, which allows permit holders to request their names and addresses be removed from the public record, we decided to remove the gun permit data from lohud.com at 5 pm today. While the new law does not require us to remove the data, we believe that doing so complies with its spirit. For the past four weeks, there has been vigorous debate over our publication of the permit data, which has been viewed nearly 1.2 million times by readers. One of our core missions as a newspaper is to empower our readers with as much information as possible on the critical issues they face, and guns have certainly become a top issue since the massacre in nearby Newtown, Conn. Sharing as much public information as possible provides our readers with the ability to contribute to the discussion, in any way they wish, on how to make their communities safer. We remain committed to our mission of providing the critical public service of championing free speech and open records.

In a letter to readers published on Friday she wrote:

So intense was the opposition to our publication of the names and addresses that legislation passed earlier this week in Albany included a provision allowing permit holders to request confidentiality and imposing a 120-day moratorium on the release of permit holder data.

She goes on to say that during the 27 days the map was online any one interested would have seen it and that the data would eventually be out of date. She also noted that the paper does not endorse the way the state chose to limit availability of the data.

The original map/article still includes a graphic - but it's a snapshot, a raster image, with no interactivity. Says Hasson in the letter to readers:

 And we will keep a snapshot of our map — with all its red dots — on our website to remind the community that guns are a fact of life we should never forget.

I continue to applaud the paper for requesting the data via a Freedom on Informat request, mapping it, keeping the map up despite threats and criticism and now responding to state law. I think the paper did a service to the state, to citizens and to journalism.

- via reader Jim and Poynter


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