[OSGeo Africa] Problem displaying both Google earth image and farm boundary layers on map canvass

Jeffery Hlongwane jeffhlongs at gmail.com
Thu Oct 10 04:46:41 PDT 2013


Hi

I am trying to align google image (georeferenced) with the farm
boundaries layer on QGIS. However, my challenge is only one layer
appears on map canvas and can only see the other via zoom to extent
option which automatically removes previously displayed layer from map
canvas. Can you please assist me? For now I can provide the following
further details.

>>>The software I am using on my machine windows 7 machine is QGIS 1.8 Lisboa.  Georeferencing was based on the following coordinates control points from Google Map.

Points	X	                  Y	
p1	­ - 25°40'40.58"S	 25°40'40.58"S	
p2	 -28°23'58.19"E	 25°40'41.81"S	
p3	 -28°23'32.75"E	 25°40'57.56"S	

>>>When comes to transformation settings I used linear type, resampling method was nearest neighbour and lastly the target srs was EPSG 4326.

-Google georeferenced image's Spatial Layer extent :
28.3874623288009538,25.6655111594936081  :
28.4012727306202954,25.6753215312726546
Google image spatial reference system : +proj=longlat +datum=WGS84 +no_defs
Farm boundaries layer extents:
On QGIS  : Spatial reference system units : xMin,yMin 26.6218,-27.0627
: xMax,yMax 29.8673,-25.1096   Spatial Reference System: +proj=longlat
+ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +no_defs
Original projection details :
GEOGCS["GCS_Hartebeesthoek_1994",DATUM["D_Hartebeesthoek_1994",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
>>> I also used checked the box for on the fly option and used WGS84. I've trying for several times and now feel I can give a shout for help. Thank you in advance.


Yours Sincerely

Jeffery Hlongwane


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