Changeset 4450

Timestamp:

May 16, 2007, 12:06:04 PM (17 years ago)

Author:

duncan

Message:

comments

File:

• anuga_core/source/anuga/coordinate_transforms/lat_long_UTM_conversion.py (modified) (1 diff)

anuga_core/source/anuga/coordinate_transforms/lat_long_UTM_conversion.py

@@ -172 +172 @@
 
     FIXME: This is set up to work for the Southern Hemisphere.
+
+Using
+http://www.ga.gov.au/geodesy/datums/redfearn_geo_to_grid.jsp
+
+    Site Name:    GDA-MGA: (UTM with GRS80 ellipsoid) 
+Zone:   36    
+Easting:  511669.521  Northing: 19328195.112 
+Latitude:   84  0 ' 0.00000 ''  Longitude: 34  0 ' 0.00000 '' 
+Grid Convergence:  0  -59 ' 40.28 ''  Point Scale: 0.99960166
+
+____________
+Site Name:    GDA-MGA: (UTM with GRS80 ellipsoid) 
+Zone:   36    
+Easting:  519384.803  Northing: 1118247.585 
+Latitude:   -80  0 ' 0.00000 ''  Longitude: 34  0 ' 0.00000 '' 
+Grid Convergence:  0  59 ' 5.32 ''  Point Scale: 0.99960459 
+___________
+Site Name:    GDA-MGA: (UTM with GRS80 ellipsoid) 
+Zone:   36    
+Easting:  611263.812  Northing: 10110547.106 
+Latitude:   1  0 ' 0.00000 ''  Longitude: 34  0 ' 0.00000 '' 
+Grid Convergence:  0  -1 ' 2.84 ''  Point Scale: 0.99975325 
+______________
+Site Name:    GDA-MGA: (UTM with GRS80 ellipsoid) 
+Zone:   36    
+Easting:  611263.812  Northing: 9889452.894 
+Latitude:   -1  0 ' 0.00000 ''  Longitude: 34  0 ' 0.00000 '' 
+Grid Convergence:  0  1 ' 2.84 ''  Point Scale: 0.99975325 
+
+So this uses a false northing of 10000000 in the both hemispheres.
+ArcGIS used a false northing of 0 in the northern hem though.
+Therefore it is difficult to actually know what hemisphere you are in.
     """
     k0 = 0.9996