I guess, the homepage of Satellite Imaging Corporation (http://www.satimagingcorp.com) with information on SPOT (time series, spatial resolution, pricing etc.) would be helpful for you.

Thanks a lot Sarah. Can u pls hint me on the difference(s) between SPOT 5 and SPOT 6? And which will be most suitable for my research intention?

As I can see it, the differences (despite launch date) between SPOT5 and SPOT6 are mainly in the panchromatic and multispectral resolution. Despite this, SPOT6 offers the same service continuity as SPOT5 and 4 before. However, you should base your decision on which satellite images to use on the research questions such as what spatial and temporal resolution you want to use to relate land use with deterioration of water quality and what water quality indicators or indices you want to detect and analyze etc., what is the area of your study site etc.? See Usali, N., Ismail M.H., 2010. Use of Remote Sensing and GIS in Monitoring Water Quality. J Sust Develop 3

Hi, if you have some good links with the French research teams, many it is possible to acquire archive and programmation for little prices (100 to 250 euros by image) under the ISIS support projec if you are developping some common research projectst. You will find here all the prices and products: http://www.astrium-geo.com/fr/

Thanks Sebastien. The astrium site contained quite alot of products and options. i'm currently reviewing my proposal to narrow down my study area so that i wont have too large an archive to acquire. Thanks again.

Hi Sarah, just wanted to ask if u could please post the link to the Usali and Ismail, 2010 publication. Tanx

Hi. Here it is. I hope it will work. http://www.ccsenet.org/journal/index.php/jsd/article/view/7338/5716

Thanks a lot Sarah, the journal was really insightful and educative. Thanks again.

Ok Richard. Thanks for the link, it should be worth exploring.

I'm curious to know what the concept of multispectral and hyperspectral imagery is all about and whether it is applicable to my line of study and the accuracy of results that will be obtained?