问题
I need to convert latitude/longitude coordinates into Easting/Northing coordinates in the Alberta 10 TM Projection.
The 10 TM projection is similar to UTM, but it is a custom projection for the province of Alberta, Canada. I think (with some effort) I could code it myself but would rather not reinvent the wheel if it's been done already.
回答1:
Grab PROJ.4 Cartographic Projections library - open source library.
Suggested parameters for 10TM:
+proj=tmerc +lon_0=-115 +k_0=0.9992 +x_0=500000 +datum=NAD27
According to this post you may need to:
change the ellps to GRS80 if your 10TM data is referenced to the NAD83 datum (instead of NAD27/clrk66). You may also need to change the false northing (y_0) to be -5000000 if your 10TM coordinates for Alberta are less than 5,000,000 (an AltaLIS "standard").
I should mention that proj.4 is the library to get for any kind of geographic coordinate system transformation. There's pretty much no transformation it can't do.
I also recommend reading Map Projections-A Working Manual (Paperback) by John Snyder if you are into these kinds of things.. it's a classic. :) (fixed the link)
回答2:
I've used GDAL (http://www.gdal.org) to do this. It supports bindings for many different languages as well.
回答3:
For free GIS libraries, take a look here: http://www.freegis.org/database/?cat=12. Hopefully you can find something that fits your needs.
回答4:
I would seriously consider using a third party dll to do this rather than code it yourself.
I don't know the full details of the 10 TM projection, but I worked on a project that required coordinate conversions between many different coordinate systems to a high degree of accuracy, including UTM and Lat/Long. We found that the maths involved was way too complicated.
Perhaps take a look at the open source PROJ.4: http://trac.osgeo.org/proj/
They seems to support a huge range of conversions, and so I hope Alberta 10 TM will be covered.
回答5:
Download the opensource GIS application MapWindow
Open the GIS Tools menu
And use their shapefile reprojection tool. Under "National Grids Canada" you can select this Alberta projection.
-Jeff Tiemann jefftiemann@gmail.com
回答6:
You can also use http://code.google.com/p/android-openmap-framework/ which can convert an Android Location to a LatLonPoint, UTMPoint, or MGRSPoint.
回答7:
You can insert your coordinates pairs to Coordinate System Transformation - online service where you can set appropriate input and desired output coordinate system. There are hundreds of coordinate systems - it is possible to simply find appropriate coordinate system using any keyword. You can see editable proj4 text definition for each coordinate system so if you need to modify any projection parametr, you can do it there. Or you can define your own custom projection...
来源：https://stackoverflow.com/questions/41937/converting-latitude-longitude-to-alberta-10-tm-projection