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Assigning Raster Coordinates

June 22 2011 | 0 comments
Categories: Map Data

This may not be the right place to ask this. I wonder if it is even possible. I have some raster images taken from a helicopter. They are shot at an angle and are of no particular bearing or orientation. They have no spatial reference, but I have a point shapefile of the locations where they were shot from which I can derive coordinates. How can I assign my single set of coordinates to a raster image as if the image is a single point feature? Once assigned can I still build a raster catalog? I guess I could develop the extents and grid once the photos are spatially oriented, although many of them would overlap. I could do this one at a time, zoom to the point, and update the georeferencing of the image, but there are 7,000 images. I would prefer to automate and I am not a heavy script writer. I am using 9.3.1. Thanks!

Mapping Center Answer:

It seems as though you are asking about two different things, 1) how to assign map the coordinates of the location that the images were taken from, and 2) how to mosaic the images to make a single image. You can do the first pretty easily but the second will be a challenge.

If you have a table of the x,y coordinates that the images were taken from, and if that table also includes a unique ID that can be linked to each image, then you can use the XY to Point tool to make geographic point features from the table with the coordinates. Once you he done that, then you might want to link the images to their locations using a hyperlink.

If you want to make a single image from all the images taken from the helicopter, you will have a challenge because you will first need to register and rectify the images – this could be a daunting and time consuming task if you have not done it before and if you have thousands of images, as you noted was the situation in your case.

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