Answering your questions may fill a book, please read below for some hints.
Quoting Khaled Mahmoud <[email protected]>: > > No replies yet :( > > I need help in beginning. > > --- On Thu, 2/10/11, Khaled Mahmoud <[email protected]> wrote: > > From: Khaled Mahmoud <[email protected]> > Subject: New to Geotools and GIS > To: [email protected] > Date: Thursday, February 10, 2011, 11:51 PM > > Hi, > > I am new to the world of GIS and GeoTool. However I have the > following question in mind about the capabilities of the API and GIS. > > 1- As far as I understand, is that most GIS images, maps ... etc, > all deal with objects location (ie coordinates of the object with > respect to longitude and magnitude). So a raster image of the > United States would contain an binary data pictures of the US along > with the location information associated with these pictures. Is > this true Images are georeferenced. Look here to get an idea http://en.wikipedia.org/wiki/World_file The coordinates belong to a Coordinate System, WGS84 is an example. Also try to understand affine transformations http://en.wikipedia.org/wiki/Affine_transformation > > 2- As understood from the Image Lab tutorial is that I can add shape > file into to a raster image file. For example if I have a map image > (Raster data) of the USA, I can embed a > a shape file to it ,to for example, to specify universities and > dorms since all systems deal with the same location (Longitude, > Latitude). A final image is constructed using layers. You may have an image layer, a vector layer showing streets and a vector layer showing railways. Drawing them in the correct order gives you a result image. All layers must have the same coordinate system. > > 3- I still don't understand how zooming > and out are handled in GIS. This depends on the pictures (Amount of > binary digital data available, right? Advanced topic,Keywords: nearest neighbor, bipolar, cubic image pyramids vector generalization > > 4- Does geo tool provide a capability that if a clicked somewhere on > the displayed image, it will get to me the coordinate clicked, and > then I can query database to display certain information or maybe > display a video. Yep, again an affine transform is your friend here (calculating world coordinates from pixel coordinates and world coordinates from pixel coordinates). T > > It's a long list of question :) > > Appreciate your answers and support, > > Cheers Christian ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
