Thanks again, Ed. I need to clear up some things that I guess I didn't make clear.
I know that a world file provides georeferencing. I meant to say that I had a .gif that had no georeferencing info associated with it, and then added one. From there I got my initial app to work (displaying the big map). One thing I omitted was that the little .gifs (tiles), when assembled, make up a different big map pic then the one where mentioned : “it uses one .gif (the big map pic), attaches the big map to the globe via a world file. That big map .gif had no georeferencing info attached to it."Before I had a pic of a large section of a college campus. Now I have a pic of the entire campus, but in little tiles. I know Mapserver makes maps and not pics too. I probably just worded something wrong. "So – what do you know about these images? Do you really have a world file that correctly describes your big GIF image? Do you know exactly how the little images were created from the big image? If so, you should be able to figure out how to generate world files for each individual image. If not, you’ll need to get that information for your big image." Yes, I have a world file, but it's for the pic that shows a large section of the campus - not for the big pic that is the sum of the little pics. Ok, so then I have to have a world file for every little tile, but before that I need to correctly set up the world file for the big pic, which I guess I'll need to assemble in Photoshop. Does that sound right? I can do it, it's just a bit tedious lining up the tiles and such. Also, how do you correctly align a pic of some map on the globe. I've been using Google Maps to do it. I'll sit there and study where the pic's corners should approximately be, then get the lat/lon from that (clicking directions to or from will yield the lat/lons). Thank you. - Chris Subject: RE: [UMN_MAPSERVER-USERS] Rasters, TileIndex and Shapefiles - Oh My! Really Confused Date: Wed, 26 Sep 2007 13:36:42 -0400 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED]; [email protected] Chris – Let me suggest you try to get unconfused just one step at a time! “it uses one .gif (the big map pic), attaches the big map to the globe via a world file. That big map .gif had no georeferencing info attached to it.” That’s a bit of a contradiction. A world file is one way of providing georeferencing. If you’ve got an image “attached” to the Earth via a world file, you’ve georeferenced it. MapServer makes maps, not pictures. One of the chief differences is that a map has geographic location information associated with it. When you ask MapServer to generate a map for you, you need to tell it the location of the map you want in some coordinate system. In order for MapServer to know which of your GIF images to use in making the output map, it needs to know the geographic location of each of those images. Otherwise it couldn’t figure out which ones to use. A TILEINDEX is step two in the process. Once you have a set of more than 1 properly georeferenced images that you’d like to use like a single logical image, you can create a TILEINDEX to do that. But you have to completely and correctly make it through step one first. Once you get the individual images properly georeferenced, gdaltindex will just work. So – what do you know about these images? Do you really have a world file that correctly describes your big GIF image? Do you know exactly how the little images were created from the big image? If so, you should be able to figure out how to generate world files for each individual image. If not, you’ll need to get that information for your big image. If you do have that world file and know how the tiles were created, let us know (you can post the world file in your reply – it’s just six lines of text). - Ed Ed McNierney TopoZone.com From: UMN MapServer Users List [mailto:[EMAIL PROTECTED] On Behalf Of Christopher Harris Sent: Wednesday, September 26, 2007 10:02 AM To: [email protected] Subject: [UMN_MAPSERVER-USERS] Rasters, TileIndex and Shapefiles - Oh My! Really Confused Hi. I have a map that is broken up into a bunch of .gif tiles. I want to display them on a layer in Mapserver. I have working version of what I want to accomplish, but it uses one .gif (the big map pic), attaches the big map to the globe via a world file. That big map .gif had no georeferencing info attached to it. These .gifs have no georeferencing information included or attached as well. I read Section 4 (and Section 9 too) on the mapserver site page: http://mapserver.gis.umn.edu/docs/howto/raster_data >From this I learned that I need a tile index shapefile. I noticed the snippet at the bottom of Section 4 about gdaltindex and creating a tile index shapefile. I tried that. Here's what I typed: gdaltindex u_of_ill.shp ~/Desktop/UofImapSquares/*.gif Here's what was returned to me: It appears no georeferencing is available for `/home/jimbo/Desktop/UofImapSquares/A0.gif', skipping. It appears no georeferencing is available for `/home/jimbo/Desktop/UofImapSquares/A12.gif', skipping. and so on......... Ok. Yes. I know. There's no georeferencing info attached. But, how do I go about attaching georeferencing info? And how do I create, edit, and view a shapefile? And lastly, do I need a world file to determine a global position for every tile? I tried using a text editor Gedit (I figured What the Hey?) to open them and nope - wasn't in UTF-8 encoding. I did some digging Google and noticed that you can use ArcView GIS, ArcMap, ArcGIS, and ArcCatalog to create, edit, and view shapefiles. I also stumbled across posting that talked about ShapeLib created by Eduardo Patto Kanegae and maintained by Frank Warmerdam. I don't have money to spend on buying some GIS program, and ShapeLib seems like the answer. Could anyone help? - Chris Get news, entertainment and everything you care about at Live.com. Check it out! _________________________________________________________________ Explore the seven wonders of the world http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE
