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

[Gavin Fleming]

Jeffery

Why are you trying to georeference a google image when you say it is 
already georeferenced? Is the Google image coming in via the OpenLayers 
plugin? If so then it is already in EPSG:3857.

If both layers have the correct CRS defined in their properties, they 
will overlay properly when on-the-fly CRS projection is switched on. So 
check what the native geometries (coordinates) of your datasets are and 
make sure they have the appropriate CRS defined.

Gavin

On 10/10/2013 13:46, Jeffery Hlongwane wrote:
> 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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-- 
Gavin Fleming
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Paarl
South Africa
18°59'19.6"E 33°44'46.1"S