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Me, I would use WorldView-2. Because it has 8 multispectral bands, especialy the Red edge and 2 NIR bands. It also have 1 pancromatic band of 0.5 m spatial resolution. So you can pansharp the multispectral bands. WorldView-2 also has a much better temporal coverage. And there are also many research papers and studies about vegetation and WorldView-2 topic. See here more details about WorldView-2 here: http://www.digitalglobe.com/downloads/WorldView2-DS-WV2-Web.pdf

Here, you can see a model of LST estimation using ERDAS : http://giswin.geo.tsukuba.ac.jp/sis/tutorial/koko/SurfaceTemp/SurfaceTemperature.pdf This is a simple model, assuming that Emissivity is uniform (=1) and no atmospheric correction is done (no corrections for atmospheric transmission, upwelling and downwelling radiances). So, if you apply this example, you can obtain a relative LST, witch is not the real-ground LST, but is very used in most literature. For more details about LST algorithm, search for http://www.sciencedirect.com/science/article/pii/S0034425712004749

Hey Mostafa, You can try to use ATCOR software http://www.geosystems.de/atcor/index.html this is free module for ERDAS 2011.