Can any one tell me from where I can buy commercial High resolution Satellite images for Biodiversity research ? I need some websites that sells these kind of images ?
Two of the best commercial high resolution multispectral products available are Worldview-2 and Worldview-3. These sensors are commonly used for natural resources and biodiversity applications. You can learn more about these products here. Another more cost efficient option is to use RapidEye medium resolution imagery (details). Of course, if your budget allows you can acquire LiDAR data for your study area. LiDAR in combination with multispectral data will allow you to make predictions based on structural and spectral properties.
Here it is the list of some high resolution imagery providers and resellers:
The biggest data provider is DigitalGlobe. They also have the arguably best satellite (WorldView-3). You can buy directly from them, or you can go through one of the many resellers. A price of around 16$ per sqkm is usual for 4 spectral bands and 20$ for 8-bands - link to list with prices.
A slightly cheaper option is Pleiades and SPOT data from Airbus D&S. Only 4 bands available.
Furthermore, you can also go for RapidEye. A 5 meter resolution is still good for many projects, but the level of detail is not near that available from DigitalGlobe or Airbus.