A few days ago, I posted about Favorite Uses for Raster Design: Cropping Aerial Imagery. Jason asked the question:
The aerial image I often use is .sid format. A high resolution image that I bring into Civil 3D through the Map 3D data connect. Do you know how i can crop this image in Civil 3D or perhaps with raster? The image covers the entire city so I would like to crop it to my work area.
I have had this problem often myself! I am happy to report that the answer is YES. You can make those lovely, giant MrSID (*.sid) files more manageable with the help of Raster Design. (Which, if I haven’t already mentioned, is now part of the Infrastructure Design Suite. Eventually, I’ll stop saying that.)
One thing to note- in his question, Jason said he is using the Map 3D data connect for his .SID. In order to crop the image, you’ll have to either use Map Image Insert (MAPIINSERT) or the Insert button on the Raster Tools > Insert panel (IINSERT). For more information on different ways to insert images into Map 3D and Civil 3D, check out Connecting to a Raster Image through the FDO.
Here is a *.sid file that I have. It covers an entire small city in North Dakota called Grand Forks. When I lived in Canada, my colleagues in Manitoba used to talk about their big weekends hitting the mall in Grand Forks, so of course I was interested to check out this short interview on youtube: City of Grand Forks Interview on Autodesk Technology and Expectation of Changes. I was disappointed that they didn’t show the mall, but I am sure it is spectacular.
Anyway, here is the image. It’s a black and white 1’ resolution *.sid.
I made a rectangular region:
And cropped it down to a smaller corner of the city. I could have cropped it down to just the neighborhood or site I was working on if I wanted.
Using the Image Export tool, I get the choice to export the image to a few different formats, including bitmap (.bmp), tagged image file format (.tif. .tiff), Portable Network Graphics File (*.png), JPEG (.jpeg), and JPEG2000 (.jp2, .jp2K).
I get some choices on export quality, which could help you if the image file is large and you don’t need it to be quite as fine as the original.
As I mentioned in the post about georeferencing scanned images, I can export the image along with a world file. This way, I am making the image more manageable without losing that geographic intelligence.
Not hard, eh? That’s how you convert a MrSID (.sid) to JPEG (or one of many other) image formats using Raster Design.
Check out the other posts in this series: