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I am relatively new to QGIS and using it on windows vista. Problem:

  1. I have to digitalise an aerial map and then extract the coordinates.
  2. I have absolutely no idea how to start

Thanking you in advance for any help shown towards me.

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which QGIS version are you using?. – rashad May 5 '13 at 14:42
What information do you hope to digitize from the aerial map? What format is the aerial map in? – Aaron May 5 '13 at 16:11
hii I am using Qgis desktop 1.8.0 – Zay May 5 '13 at 18:33
HI aaron,I hope to extract coordinates of buildings in a city. the aerial map is from google earth. – Zay May 5 '13 at 18:34
There is another problem, if you want to digitize from aerial photographs, everything will be distorted since this kind of material does no have a constant scale. On the other hand if you are usin already orthorectified material you can do it without a problem, since this kinf of material comes already with a Coordinate system. – Gerardo Jimenez May 6 '13 at 14:27

Although i hate giving link-only answers your question literally calls for it. If you have absolutely no idea how to start you should definitely read some tutorials first. The purpose of this site is to help you with GIS problems and not to teach you how to work with GIS-software! IMHO this requires to take ether a professional course or a lot of spare time for reading/practice.
Here are some tutorials to get you started.

For basic and advanced tutorials:

For applied tutorials including digitalization:

Click through the tutorials and if you still stumble upon any problems during a specific problem than post the details of your problem in a new question (mentioning the software you used).

share|improve this answer
Hello Curlew, Thanks a lot for your answer, i am going to check the links. Problem is in my country there is no QGis course available...:( – Zay May 5 '13 at 18:35

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