Tag Archives: ArcGIS Server. Image Server

Publishing ECW Imagery with ArcGIS for Server

Being in Australia one of our most popular image formats is ECW. In other countries ECW is not as prevalent. This is geographic anomaly as the ECW format came from ER Mapper, developed out of Perth. ER Mapper was a cost effect Image processing product which provided very good image processing capabilities at a good price point. This led to wide market penetration in Australia but not other parts of the world. One of the by products of this legacy is the ECW image format. Based on the wavelet compression technology it provides for very good image compression and provides good speed to display. Hence it’s wide use here in Australia..

In other parts of the world the same compression is achieved using either the MrSID format or JPEG 2000. Both are wavelet compression technologies and both also provide good speed to display. The fundamental difference between all three formats is that MrSID and ECW are licensed formats while JPEG 2000 is an open format.

What does this mean to ArcGIS users?

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Replacing Rasters in an Image Service

In some cases it might be necessary to replace a source image in an Image Server service (.ISDef) and then to rebuild the overviews for the affected area. This might be in situations where new imagery has become available or where there were problems with an original. This blog details the steps required for doing this (without having to rebuild the service from scratch):

– First make a back up of your image service (.ISDef).

– Using the ArcMap selection tools, select the source image to replace (this should select all associated overviews at the same time). You might need to zoom to the source image to achieve this.

– Remove the selected images from the service: Image Service > Advanced > Remove Raster Dataset. In the dialogue box that comes up, tick ‘Remove raster data set’, ‘Delete raster process definition files’ (as long as the selected files are not being used by another service) and ‘Delete derived images’.

– Once the images are removed, build the service: Image Service > Advanced > Build. In the dialogue box, tick on the ‘Compute pixel size’ and ‘Create service boundary tick’ options.

– On completion of the build, add in the replacement source image: Image Service > Advanced > Add Raster Data Set.

– Build the overviews once more: Image Service > Advanced > Build. Again tick on the ‘Compute pixel size’ and ‘Create service boundary tick’ options.

– Next define the overviews: Image Service > Advanced > Optimise > Service Overviews > Define (accept default options)

– Make sure the overviews look correct and then build overviews a final time: Image Service > Advanced > Build. This time in the dialogue box, tick on the ‘Generate derived image’ and ‘Compile service’ options.

– Your image service is now updated

John H

ESRI Global Content – How to Publish a Mosaic Dataset to ArcGIS Server

This blog aims to highlight the fact that ESRI Australia staff are actively contributing to the content of the main ESRI Inc (US) web site, as well as our own. In fact ESRI Inc is pushing for all local distributors, across the globe to ramp up the amount of  ‘ESRI Global Content’ they submit.

Well, here is a link to our first contribution (of many…) to get the official sign off: http://support.esri.com/en/knowledgebase/techarticles/detail/39660.

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