In this topic
- About processing raster data
- Performing raster processing using geoprocessing and ArcMap toolbars
- Performing raster processing using ArcObjects
About processing raster data
Processing raster data is a very important step in bringing imagery and raster data into geographic information system (GIS) applications. Generally, ArcGIS provides two types of raster processing capabilities: geometric processing, which transforms raster data into a correct map coordinate system; and radiometric processing, which transforms the pixel values to enhance display and provide meaningful pixel information for further analysis.
Raster processing handles the following typical situations:
- Transforms (georeferences) your imagery into the correct coordinate system so you can overlay your raster data with other GIS layers
- Automatic image-to-image registration
- Reads the sensor model in the raster data and transforms imagery into map space and orthorectifies the imagery using elevation models
- Projects raster data to your specified projection
- Resamples raster data into the pixel resolution of your choice
- Mosaics and clips raster data
- Pan-sharpens RGB data with high resolution panchromatic imagery to enhance spatial resolution
- Applies various filtering algorithms to enhance raster display
- Creates hillshade and slope from elevation data for further raster analysis
For more information on processing raster data, see Image Analysis window: Processing section.
Processing raster data using geoprocessing tools and ArcMap toolbars
ArcGIS provides a set of easy-to-use geoprocessing tools and ArcMap toolbars. The geoprocessing tools for processing raster data are located in the Raster Processing toolset of the Raster toolset and in the Projections and Transformations toolset in the Data Management toolbox. The Georeferencing toolbar in ArcMap allows you to georeference raster data by interactively setting the source and target control points. A dynamic raster processing capability was introduced at ArcGIS 10 whereby you can access dynamic raster processing capabilities through the Image Analysis window or by editing function chains, described in the ArcGIS Desktop Help topic Editing function chains in a mosaic dataset.
Processing raster data using ArcObjects
Although many raster processing capabilities have been exposed to the end user through geoprocessing tools and ArcMap toolbars, you may still need to develop applications using ArcObjects to meet your specific requirements. To extend processing capabilities, such as writing your own geodata transform, raster function, pixel filter, and so on, you can use the ArcObjects application programming interface (API).