We are starting of a series of benchmarks with the new version of IWS. A long with this, were are also doing some testing with other server software, to compare the performance.
I will be publishing the results on this blog over the next two weeks.
For the first test, a loop was setup off through a pre-built CSV file with 2000 sample BBOX' of varying scale. Each HTTP request is randomised between 256x256px up to 1024x768px to reproduce real world settings. A ....
In Image Web Server documentation, for bounding boxes or coordinate references, we often refer to TLX, BRX, TLY, BRY. TLX stands for "Top Left X-coordinate". "BRX", refers to "Bottom Right X-coordinate.
Other applications may instead use different terms, such as MINX and MINY.
How do the two systems relate? Well, very easily, the mapping is found below:
MAXX = BRX
MAXY = TLY
MINX = TLX
MINY = BRY
So, yo....
If you didn't manage to attend the "Throw Away Your Tile Cache" webinar, here are the powerpoint slides i used, as well as a video recording.
It was a real pleasure to show off the hard work of the IWS engineers in this webinar. The team constantly impress with their mantra "performance".
Hardware resources and hardware speed are just like money. There is never enough! You always want faster! Even with the multi-core systems that are out today, you still want m....
Image Web Server can now serve your vector data at the same blazing fast speed it serves image data!
Next Tuesday, 25th of August, Richard Orchard, Product Manager of Image Web Server, will be hosting a webinar previewing this exciting, upcoming feature of Image Web Server.
The webinar will show you how you can effectively serve both image and feature data with Image Web Server at unbelievably fast speeds. In particular, new features of the "opt....
Google and Microsoft Virtual Earth both use a Spherical Mercator projection for their geospatial data. This is represented by the EPSG code of 900913. This particular coordinate system converts the earth into a perfect square. This fits perfectly with the square image tiles that are delivered by the Google and Microsoft Systems....
Our development team, on top of getting ready for a big release in the fourth quarter, has released an update to our popular ECW Plug-in for AutoCAD. The plug-in allows massive images to be viewed with ease in an AutoCAD environment. The images can be accessed locally (in ECW or JPEG 2000 format), or even better, via ECWP from Image Web Server.
The new version resolves some issues with AutoCAD 2009, when it had the latest service pack applied to it.
At the same ti....
J2i files speed up the delivery of JPEG 2000 files.
J2i files are an "index" of the JPEG 2000 file. Indexes of JPEG 2000 files can be many hundreds of megabytes in size. J2i files are automatically created by Image Web Server and used to speed up decoding and lower the memory overhead....
You may have noticed that over the past few years the sizes of hard-disk drives has grown tremendously. If I look on Amazon.com today, i can see 1.5 Terabyte hard-drives for around $150. Wow! That is pretty cheap.
So, you may ask yourself, do I still need to compress imagery? I have got these massive hard-disks, maybe I don't have to worry about it. But there is something you need to be aware of....
Disk speed is pretty much the same as it was 1....
WMS or Web Mapping Service is a popular way of distributing geospatial data.
However, something that has been showing up more recently is that people may overlook the performance gains they get with simply using client-side asychronous access. Instead, they make one of their server components work really hard and subsequently slow down their entire application. Cascading Services through a single server.
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Server-side use of ECW technology requires a valid, paid license that is issued by ERDAS.
This is true of any type of server product, whether it be commercial, proprietary or "open source".
Typically, the software company that made the product would have purchased a "Software Development Toolkit" from us to allow them to use ECW in their server.
If you have a paid license, you are able, from a legal and licensing stand point, use ECW files and techn....
I would like to explain, in "plain English", what is required when using the ECW technology in your applications. The ECW technology is contained within a "software development kit", the ECW JPEG 2000 SDK. This kit provides read and write ability for both ECW and JPEG 2000 files.
There is no difference in the license use terms between "code-closed" or "open source" applications. Both types of applications are treated the same under the ECW technology use agreement (the End-User....
If you create web-based GIS websites without using the browser plug-in that provides ECWP ability you need to be aware of something very important.
All modern web browsers impose a security restriction that prevents a script or application from making a connection to any web server other than the one the web page originally came from.
So, if your JavaScript file comes from http://iws.erdas.com/ it can only talk t....
If you are wondering how to create a website using Optimized Tile Delivery, or OTD, I have some very good news for you.
OTD sites are created using the same website API that are used to create other Image Web Server sites. It is exactly the same as when you are creating DHTML sites, and only marginally different from creating ECWP high-speed streaming sites.
The only real difference is that the file you are passing is a .OTDF file.
So, to create yo....
Imagery can be stored, and served, from anywhere on your network.
You do need to be aware of some simple network and security considerations.
Just like you "login" to your computer, so does the applications that you use. Sometimes they just "borrow" your login, but other times they use any number of system defined "user details". This is particularly the case for any server application.
Image Web Server operates under a defined user account. This ....
For Windows based installations, before installing Image Web Server you will want to check that you have Internet Information Services installed.
Internet Information Services is the free web server that is packaged with the windows operating systems....
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