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ARC Digitized Raster Graphics (ADRG)

Arc digitized raster graphics (ADRG) data is distributed on CD-ROM by the United States Defense Mapping Agency. ADRG is geographically referenced using the equal arc-second raster chart/map (ARC) system in which the globe is divided into 18 latitudinal bands or zones. The data consists of raster images and other graphics generated by scanning source documents. Images in non-polar regions will be in a geographic (lat/long) reference system with units in decimal degrees. The datum is WGS84. Images in polar regions will have an Azimuthal Equidistant projection with units in meters. The datum is WGS84.

The ADRG image format is defined by U.S. DoD Mil-Spec No. MIL-A-89007: Arc Digitized Raster Graphics (ADRG), 1990.

To use ADRG images with ArcView you must first load the ADRG Image Support extension.

By default, ArcView looks for ADRG images when they have these file extensions:

 .ovr

 .img

To modify the extensions list, use the ISrc.SetExtensions request.

There are many images within the ADRG directory structure that can be used with ArcView. The following is a discussion of this directory structure.

 Transmittal header file (.THF) - contains data describing the contents of the CD-ROM. This file is needed to display the test patch image file.

 Test patch image file (.CPH) - image derived from a standard graphic arts color control patch. Cannot be displayed with ArcView.

 General information file (.GEN) - general information to support the overview and ZDR images. This file is needed to display the overview image file or the geo data file.

 Quality file (.QAL) - contains the horizontal and vertical accuracies of the images. This file is not used by ArcView.

 Overview image file (.OVR) - reduced resolution image of a distribution rectangle (DR). Can be displayed with ArcView.

 Geo data file (.IMG) - full resolution image of a zone within the distribution rectangle (ZDR). Can be displayed with ArcView.

 Source file (.SOU) - contains information on the source graphic for the ZDR image. This file is needed to convert or display a legend image file.

 Legend image file (.Lgg, where gg are numbers) - zero or more images of selected margin information. Can be displayed with ArcView. Before you can display these images in ArcView, you should turn extension checking off with ISrc.SetExtensionChecking(FALSE).


Compressed ARC Digitized Raster Graphics (CADRG)

Compressed ARC Digitized Raster Graphics (CADRG) data is distributed on CD-ROM by the United States Defense Mapping Agency. CADRG is geographically referenced using the equal arc-second raster chart/map (ARC) system in which the globe is divided into 18 latitudinal bands or zones. The data consists of raster images and other graphics generated by scanning source documents. CADRG achieves a nominal compression ratio of 55:1.

The CADRG image format is defined by U.S. DoD Mil-Spec No. MIL-C-89038 (6-Oct-94). See the NIMF (formerly DMA) WWW page at http://164.214.2.59/publications/guides/dtf/cadrg.html for details and up-to-date information. CIB images are compressed, and are compliant with the Raster Product Format (RPF) and National Imagery Transmission Format Standard (NITFS). RPF is defined by U.S. DoD Mil-Specs No. MIL-STD-2411 (6-Oct-94), MIL-STD-2411-1 (30-Aug-94), and MIL-STD-2411-2 (26-Aug-94). NITFS is defined by U.S. DoD Mil-Specs No. MIL-HDBK-1300A (12-Oct-94), MIL-STD-2500A (12-Oct-94), and MIL-STD-188-198A (15-Dec-93).

To use CADRG images with ArcView you must first load the CADRG Image Support extension.

By default, ArcView looks for CADRG images with any file extension. This means that the Add Theme dialog will show all files in a directory when browsing for image data sources. It is up to the user to select the correct image data sources to be added as image themes to a view.


Controlled Image Base (CIB)

Controlled Image Base (CIB) images are panchromatic (grayscale) images which have been georeferenced and corrected for distortion due to topographic relief. Thus, they are similar to digital orthophoto quads, and have similar applications, such as serving as a base or backdrop for other data, or as a simple map.

The CIB image format is defined by U.S. DoD Mil-Spec No. MIL-C-89041 (15-May-95). CIB images are compressed, and are compliant with the Raster Product Format (RPF) and National Imagery Transmission Format Standard (NITFS). RPF is defined by U.S. DoD Mil-Specs No. MIL-STD-2411 (6-Oct-94), MIL-STD-2411-1 (30-Aug-94), and MIL-STD-2411-2 (26-Aug-94). NITFS is defined by U.S. DoD Mil-Specs No. MIL-HDBK-1300A (12-Oct-94), MIL-STD-2500A (12-Oct-94), and MIL-STD-188-198A (15-Dec-93).

To use CIB images with ArcView you must first load the CIB Image Support extension.

By default, ArcView looks for CIB images with any file extension. This means that the Add Theme dialog will show all files in a directory when browsing for image data sources. It is up to the user to select the correct image data sources to be added as image themes to a view.


Military Data Reader extensions (description)
Military Data Reader extensions

This ArcView extension provides direct access to ARC Digitized Raster Graphics (ADRG), Compressed ARC Digitized Raster Graphics (CADRG), Controlled Image Base (CIB), and National Image Transfer Format (NITF) images as image themes.

To load the Military Data Reader extensions, make the ArcView Project window active and then choose Extensions from the File menu. You can load one or more of the above image formats.

If you don’t see the ADRG Image Support, CADRG Image Support, CIB Image Support, or NITF Image Support extensions in the list, it’s possible that you may not have installed the extension.


Loading the Military Data Readers
To load the Military Data Reader extensions

1	Activate the ArcView Project window.

2	From the File menu, choose Extensions. This will bring up the Extensions dialog.

3	Check the box next to ADRG Image Support, CADRG Image Support, CIB Image Support, or NITF Image Support in the Extensions dialog. You can load any combination of these extensions at the same time. If you want any of these extensions to load automatically every time you start ArcView, press the Make Default button after checking the box next to the extensions. The next time you start ArcView the extensions selected will automatically load.

4	Press OK in the Extensions dialog.


National Image Transfer Format (NITF)

The National Image Transfer Format (NITF) was developed by the U.S. Department of Defense as a standardized format for images and supporting data. Only uncompressed and 8-bit JPEG compressed NITF Version 2.0 images are supported.

The NITF image format is defined by U.S. DoD Mil-Specs No. MIL-HDBK-1300A (12-Oct-94), MIL-STD-2500A (12-Oct-94), and MIL-STD-188-198A (15-Dec-93).

To use NITF images with ArcView you must first load the NITF Image Support extension.

By default, ArcView looks for NITF images when they have these file extensions:

 .ntf

To modify the extensions list, use the ISrc.SetExtensions request.

ArcView’s NITF Image Support extension is based in part on the work of the Independent JPEG Group. Copyright © 1991-1996 Thomas G. Lane. All rights reserved.


 Using the Military Data Reader extensions

The Military Data Reader extensions add support for ADRG, CADRG, CIB, and NITF images. Once the proper extension for each image format is loaded, you are able to use these image data sources with ArcView like you would use any other supported image data source.

What do you want to know about using images with ArcView?

Image overview

Adding an image theme to a view

Editing an image's legend

Setting the extent of an image

How images are registered to a map

Resampling

Image catalogs

Adding an image catalog to a view

Other supported image formats


What are the Military Data Reader extensions?

The Military Data Reader extensions are designed to enable ArcView to recognize a variety of image data formats, typically of interest to the defense/intelligence community, as direct read image data sources. No translation is required to use these image data sources. Once the data is represented as an image theme in a view, any appropriate functionality of ArcView can be applied to the theme. The Military Data Reader consists of multiple extensions. You may use any combination of these extensions at any time. The extensions include:

 ADRG Image Support - Adds support for ARC Digitized Raster Graphics (ADRG) images.

 CADRG Image Support - Adds support for Compressed ARC Digitized Raster Graphics (CADRG) images.

 CIB Image Support - Adds support for Controlled Image Base (CIB) images.

 NITF Image Support - Adds support for National Image Transfer Format (NITF) images.