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Tiling of large raster maps for ArcIMS

June 01 2011 | 0 comments
Categories: ArcGIS Methods

Dear Cartographer,

I have to create a map for a customer project that has a total uncompressed raster size of 46 GByte. The map will cover a complete country on an overview layer and dedicated city areas on a detail layer.
The detail maps of the city level provided by the customer consist of .TIF map tiles that have an uncompressed size between 130 MByte and 480 MByte. Map tiles will be stored in directory on the hard disk. I will be using ArcIMS 10.

Now to my question: Should I divide/split the large map tiles into smaller pieces before building the map? I've heard (can't remember where) that map tiles should not be larger than 10 MByte each for ArcIMS.

I have searched the internet and the available ESRI ressources for an answer, but no luck. It would be great if you have links to any information that covers my topic.

Thank you.

Mapping Center Answer:

We asked our raster team for some help on this one -- here is what they told us:

The default memory limit is an image 1024 by 1024 pixels, which represents about 4 MB of memory usage. You can have ArcIMS automatically resize images that exceed this limit by adjusting the autoresize attribute in the GET_IMAGE request for the map view and GET_LAYOUT request for the layout view.

Ideally, you should use ArcGIS Server and the Image extension, if you can migrate, as 10.0 was the last release of ArcIMS, so I would not recommend putting much effort there. Mosaic datasets are the best way to store, manage, view and query raster data and to serve as Image services.

Here are few resources that might help:

If you need additional help, please contact Esri Technical Support -- there is a link to Tech Support from here on the Ask a Cartographer page on the fourth tab.

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