2004 UC Proceedings Abstract
 Managing Large Collections of NGA Raster Data Track: Defense and Intelligence Author(s): Bernard Traphan, DJ Bauch NGA (formerly NIMA) raster data presents a unique set of challenges and opportunities. This paper will discuss how these challenges are being addressed at the Joint Information Operations Center to provide easy and efficient access to multiple terabytes of raster map data and imagery. NGA data is provided as discrete map images at a variety of scales but with a common projection scheme. It is possible to take advantage of the characteristics of this scheme (the Equal Arc Second Digitized Raster Graphics, or ADRG scheme) to produce bands of raster data. This results in reduced round-trip traffic and thus increased performance between ArcGIS/ArcIMS and the ArcSDE server. The ADRG scheme divides the globe into eighteen latitudinal bands (nine in the northern hemisphere and nine in the southern hemisphere). Map products at any particular scale within each of these bands share common projection parameters and may be combined into a mosaic for that band and scale. ArcObjects programming is necessary to create these raster bands because ArcSDE doesn't support the ADRG product format. The purpose of this presentation will be to present the steps necessary to create these raster mosaics and to analyze the performance benefits that accrue. Bernard Traphan JIOC PO Box 769178 San Antonio , TX 78245 US Phone: 210-414-5226 E-mail: Bernard.Traphan@jioc.osis.gov DJ Bauch JIOC/J62 2 Hall Blvd, Ste 217 San Antonio , TX 78243-7008 US Phone: 210-977-4771 E-mail: Danny.Bauch@jioc.osis.gov |
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