I suggest you to choose the camera that gives you the requested performance, then use its weight to choose the suited drone.

Dear Hayder,

You may find these references useful:

http://myfirstdrone.com/tutorials/buying-guides/best-drones-for-sale/

http://heavy.com/tech/2014/10/rc-best-drones-for-sale-aerial-photography-camera-surveillance-unmanned-aerial-systems-helicopters-remote-quadcopter/

10 x 10km is a lot of land to cover with a drone. Have you thought about using a satellite picture?

http://www.satsig.net/maps/satellite-photo-image-viewer.htm

With that area, you may be better to use a winged drone (as the flight time will be longer) rather than the vertical lift variety.

How often do you want to update the photographs? If you choose to run the drone at 100m high you can probably photograph a 150m wide strip of land. At 4096 line resolution ((16Mpix resolution) You could see objects greater than 40mm wide with the appropriate lens. At a speed of 15m/s (30mph) it would take around 11 minutes per 10km strip. (then you would have to change the battery) and 67 trips (at 150m per strip) to look at the whole area; about 20 hours in total (when taking time to change batteries)

Hope this helps

Paul

I agree with most of what was already mentioned. Just to give you a structured approach:

1. Start by clearly defining the task, properly selecting measurable objectives that you can quantify in terms of sensor, craft and support equipment performance (e.g. what coverage, what resolution [spatial & temporal], what type information [e.g. topographical, vegetation, obstacle/construction, etc..], what degree of navigation/georeferencing, etc..), what data treatment requirements - btw, in this step it may also pay to compare to other than UAS means to collect the data; maybe you even find out that driving out there might be cheaper/faster...)

2. Select a sensor/combination of sensors that can provide the required data based on objectives (e.g. visual, IR, multispectral, SAR, LiDAR, etc..; but also position sensors e.g. GPS, radar altimeter, doppler/IN, etc...)

3. Select a craft that can carry the selected sensors while at the same time providing performance IAW your task criteria (e.g. enough speed, enough endurance, proper launch and recovery, etc...) and select required support structures

4. Based on previous selections, sketch a plan of operation and evaluate feasibility in terms of fulfillment of task (are the objectives met), requirements and limitations of operation (under which conditions [e.g. day/VFR only, less than XY wind, etc..] can be operated), legal and regulatory compliance (e.g. is the selected solution legal and what has to be done to get operating approval), and contingencies

5. With the evaluation results from 4. repeat and fine-tune the entire cycle until optimal solution is achieved

Also, if cost/time/man-hour requirements are factors, they may be reflected in some objectives in 1. or also be evaluated in 4.

Somewhat mission planning in a nutshell (;)), but I hope that helps...

Stefan

Really i am very appreciated from all of you for your priceless advises.

My best wishes