# GRASS Help System

## INTRODUCTION: GRASS IMAGE PROCESSING CAPABILITIES

The Geographic Resource Analysis Support System (GRASS) integrates a geographic information system (GIS) with an image processing system. A GIS has four components: a data input system, a data storage and retrieval system, a data manipulation and analysis system, and a data reporting system. Data inputs may include spatial and thematic data derived from a a combination of existing maps, aerial photographs and manual interpretations of remotely sensed imagery.

Remotely sensed imagery is imagery acquired at some distance using a camera or a sensor. With a GIS, an analyst can define spatial procedures to generate new information such as the best location to build a road, preserve a wildlife habitat or harvest timber.

An image processing system has at least five elements: image input, image storage, image analysis, accuracy assessment, and information reporting. Note the similarity of these two systems.

When geographic information systems and image processing systems are integrated, not only can the remote sensing data be used to update the GIS, but the GIS thematic data and attributes can be used to guide image classification.

To access information on specific imagery commands available in GRASS, return to the Image Processing Menu and select an area of interest.

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Automatically created on: Wed Oct 12 14:08:41 2005