[Qgis-user] How do I register a Google Map?

[Mike Keelan]

OK, I installed the Open Layers plugin and it works very nice but it 
won't do what I need, so let me be more specific and see if there might 
be a remedy.

The contour lines that I want were actually obtained using a hand held 
Garman GPS.  The Garman data was overlaid on the Google map, (with water 
depths),  special integration,  then that map was exported as a Jpeg, 
then imported to PowerPoint where a visual interpolation was done to 
make the final set of contour lines for the various lake water depths.

My desire is the _digitize_ these contour lines as a set of separate 
layers. ie 5' deep, 10' deep, etc.  There are many good uses for these 
layers,  but they must be accurate as to location and size.  I don't 
think I necessarily need spacial info on the "map"/Jpeg if I can get the 
whole map in the right position, and size, so I can do the digitizing 
(which would then have the spacial info).  Then I can discard the Jpeg.

Is it hopeless?

Mike K



  2/3/2014 4:09 PM, Alex Mandel wrote:
> On 02/03/2014 01:07 PM, Etienne Tourigny wrote:
>> Simple jpeg files do not have any spatial information.
>>
>> you should use the Open Layers plugin - you need to install it with the
>> Plugin Manager(Plugins->Manage and install plugins) and then add a Google
>> maps layer through the Plugins->Open layers menu item.
>>
>>
>>
>>
>> On Mon, Feb 3, 2014 at 6:28 PM, Mike Keelan <tmike.elhoa at comcast.net> wrote:
>>
>>>   Hi all.
>>>
>>> I am new to this program use.  I have the following setup.
>>>
>>>     - I'm trying to use Qgis 2.0
>>>     - My PC is with Windows 8 OS
>>>
>>> The program downloaded successfully and I'm able to load my .shp and Ortho
>>> layers, all well and good.  Still learning, but ..........  Here is my
>>> current problem.
>>>
>>> I need to overlay a Google map containing some lake bottom contour lines.
>>> The file I pulled in as a layer is a .jpg.  I'm able to view this layer if
>>> I zoom to its extent seperatly from the other layers, so I know it is there.
>>>
>>>     1. How do I get this layer in the location I need it to be in relative
>>>     to my other layers?  Looking at the coordinates for this layer extent it
>>>     has defaulted to 0.0 at the upper-left hand corner.  From the properties
>>>     box it will not let me change this info?
>>>     2. If there is a way the register this layer, it looks like the scale
>>>     is about 50% of the size of my other layers.  I got this from using the
>>>     linear measurement tool on both layers.  Is there a way to adjust the size
>>>     of the jpg layer?
>>>      3. In making the above measurements I noticed that the units were
>>>     given in meters even though the coordinate system selected is indicated in
>>>     FT for both layers.  ??
>>>
>>> Hope some one can point me in the right direction.
>>>
>>> Mike K
>>>
> If it's really from Google Maps, try the OpenLayers plugin which will
> live overlay maps from the web as a layer, then you don't need to
> georegister the image yourself.
>
> Enjoy,
> Alex
>
>

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