GEOREFERENCING IN ERDAS PDF

Persist the georeferencing information Raster data is obtained from many sources, such as satellite images, aerial cameras, and scanned maps. Modern satellite images and aerial cameras tend to have relatively accurate location information, but might need slight adjustments to line up all your GIS data. Scanned maps and historical data usually do not contain spatial reference information. In these cases you will need to use accurate location data to align or georeference your raster data to a map coordinate system.

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To overlay raster data with real world vector data, images must be georeferenced to the same coordinate system. For example the header of the image myimage. Procedure If the image does not contain header information, it can be georeferenced using a world file. An image world file provides coordinates and dimensions for the upper left pixel of the image, considered the origin of the image.

ArcView will draw the remaining pixels of the image based on this origin. Question: What is the format of the world file used for georeferencing images? Answer: The world file is an ASCII text file associated with an image and contains the following lines: Line 1: x-dimension of a pixel in map units Line 2: rotation parameter Line 4: NEGATIVE of y-dimension of a pixel in map units Line 5: x-coordinate of center of upper left pixel Line 6: y-coordinate of center of upper left pixel If your image lacks a world file, you can create your own world file, using a text editor.

This is generally practical only when the image does not require any rotation or rectification to be properly georeferenced, meaning lines 2 and 3 should be zero.

Line 4 is negative to convert from image row numbering increasing from the top down to map coordinates increasing from the bottom up. For a rectified image, line 4 must be equal to line 1 and of opposite sign. The world file must follow this naming convention. If the image file name has a 3-character extension image1.

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Fundamentals of georeferencing a raster dataset

To overlay raster data with real world vector data, images must be georeferenced to the same coordinate system. For example the header of the image myimage. Procedure If the image does not contain header information, it can be georeferenced using a world file. An image world file provides coordinates and dimensions for the upper left pixel of the image, considered the origin of the image.

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Aragore Discussions General discussions Smart M. Apps Smart Cities Smart M. Thanks for your help and support, I had the chance to look at the documentation, then I come up with the following procedure, Please have a look at it and correct me if I am wrong. Apps Georeferencig Smart M.

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