There's this as well: http://gis.washington.edu/phurvitz/gis_data/projection_exercise/index.html
Basically the drill is to get a set of layers in various different common geodetic systems, and add them to a data frame along with the one whose system is unknown ("orphan"). Make sure to "clear" the coordsys on the data frame so all objects are placed on a generic coordinate plane. Then see if the orphan data set lines up correctly with one of the reference data sets. If it does, bingo, that will be the coordsys used to define the coordsys of the orphan. If the orphan does not line up properly with any of the reference data sets, the conclusion is that the orphan is stored in some non-standard coordsys. If there are only simple XY shifts one could presumably fidget with the offsets. If there is warping or rotation things could get a bit more complicated.
-P. ************************************************************** Philip M. Hurvitz, PhD Urban Form Lab | 1107 NE 45th Street, Suite 535 | Box 354802 University of Washington, Seattle, Washington 98195-4802, USA [email protected] | http://gis.washington.edu/phurvitz "What is essential is invisible to the eye." -de Saint-Exupéry ************************************************************** On 1/28/2011 5:11 PM, Steven Garrett wrote:
Chris, I have no choice about the dataset. It is not basemap data that can be substituted. For now, I have georeferenced the raster to the other layers and made a decent looking map. I have time to try other ideas that you'all throw my way. Steven ------------------------------------------------------------------------ *From:* Chris Gardner <[email protected]> *To:* "[email protected]" <[email protected]>; "[email protected]" <[email protected]> *Sent:* Fri, January 28, 2011 5:06:27 PM *Subject:* RE: Fw: [UW-GIS-L] Projecting raster Steven, Are you required to use the netCDF raster or are you free to use another file in its place to serve the same purpose? If it’s an orthophoto, there are several portals that might offer you free backdrop imagery of high-quality like the USGS Seamless data server. Probably the easiest route is to stream Bing maps directly into your ArcGIS project though. Just add in the layer from ArcGIS online. I have experienced excellent results and performance draping data having a NAD 83, WA State Plane spatial reference over native Bing Maps imagery that is in the WGS84, Mercator Auxiliary Sphere system. If you can’t substitute another raster for the netCDF one I would echo Lisa’s suggestion though. Good luck! Chris *From:*[email protected] [mailto:[email protected]] *On Behalf Of *Lisa Sturdivant *Sent:* Friday, January 28, 2011 4:38 PM *To:* [email protected]; [email protected] *Subject:* Re: Fw: [UW-GIS-L] Projecting raster Steven, Since this is a time-sensitive project, have you considered re-projecting the other features in your map to match the raster dataset? If the layers still do not match up that may point to an underlying problem with the datasets, which you should explain in your map sample. -lisa sturdivant Michael, That is not really an option. I have been given a dataset which I know little about (both the data content and the dataset format) and have been asked to make a sample map. Steven Steven M. Garrett, MA, MS, RD Sustainability Consultant Project management. Policy analysis. GIS Tacoma, WA 253.988.3654 [email protected] <mailto:[email protected]> ------------------------------------------------------------------------ *From:*Michael August <[email protected] <mailto:[email protected]>> *To:* Steven Garrett <[email protected] <mailto:[email protected]>>; UW - GIS Discussion and Support <[email protected] <mailto:[email protected]>> *Sent:* Fri, January 28, 2011 3:08:30 PM *Subject:* RE: [UW-GIS-L] Projecting raster I’ve had some strange results in the past with ArcMap trying to project things on the fly when adding datasets with different projections into the same .mxd. I would start fresh with two datasets that you know are in the same projection and add them to a new .mxd file, if you haven’t tried that already. Michael *From:*[email protected] <mailto:[email protected]> [mailto:[email protected] <mailto:[email protected]>] *On Behalf Of *Steven Garrett *Sent:* Friday, January 28, 2011 2:44 PM *To:* UW - GIS Discussion and Support *Subject:* Re: [UW-GIS-L] Projecting raster Harvey, Thanks, I found the tool using the search window. I projected the netCDF raster file to State Plane and a ERDAS Imagine copy to NAD83 Harn and neither worked. If I cannot get it just georeference it. Not as clean or technically correct, though. Steven ------------------------------------------------------------------------ *From:*Harvey Greenberg <[email protected] <mailto:[email protected]>> *To:* Steven Garrett <[email protected] <mailto:[email protected]>>; UW - GIS Discussion and Support <[email protected] <mailto:[email protected]>> *Sent:* Fri, January 28, 2011 2:25:06 PM *Subject:* Re: [UW-GIS-L] Projecting raster I never had much luck browsing the toolboxes. I used to use the index, but that has been replaced in version 10 with the search window. You may find that window docked to the right of arcmap, or you can find the icon in the toolbars in under the "Windows" pulldown. In the search window, type project raster, and it will search for possible tools, with links provided. harvey On 1/28/2011 2:08 PM, Steven Garrett wrote: > Hi all, > I am trying to get a netCDF raster with a WGS coordinate system to align on my map with State Plane features, but it is slightly off. I have tried all kinds of things, but none have worked. I am using ArcGIS 10 for the first time, I have never used this type of dataset before, and have not done GIS for months, which may explain my problems. When I to go the help menu, it says to use the "Project Raster" tool under "Data Management Tools," but that tool is not there. > > It is critical that I get this done today. The map is a job test for an interview on Monday. I am kinda freaking out and need what may appear to be some pretty basic assistance. > > Steven > Steven M. Garrett, MA, MS > Sustainability Consultant > Project management. Policy analysis. GIS > Tacoma, WA > 253.988.3654 > [email protected] <mailto:[email protected]> > > > > > > _______________________________________________ > Uw-gis-l mailing list > [email protected] <mailto:[email protected]> > http://mailman2.u.washington.edu/mailman/listinfo/uw-gis-l -- http://gis.ess.washington.edu/ [email protected] <mailto:[email protected]> 374 Johnson Hall 206-685-7981 Harvey Greenberg University of Washington Department of Earth and Space Sciences College of the Environment Box 351310 Seattle WA 98195-1310 _______________________________________________ Uw-gis-l mailing list [email protected] <mailto:[email protected]> http://mailman2.u.washington.edu/mailman/listinfo/uw-gis-l _______________________________________________ Uw-gis-l mailing list [email protected] http://mailman2.u.washington.edu/mailman/listinfo/uw-gis-l
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