Hello, pls another question I have has to do with Landsat 7 ETM imagery L1T. Before I can use it for change detection, what are the preprocessing steps required? or can I omit preprocessing since its been radiometrically and geometrically corrected according to the L1T specifications?
Thank you in advance
Hello pls you tell me the steps required to conduct NDVI on landsat imageries from 2000 to 2009. I am using Erdas and am new to everything. thank you
just following up to the above. i want to map mosquito breeding habitats using an ndvi stratification. from literature ndvi values of 0.54 and above re associated with potential mosquito habitats. i want to see how these habitats change over the years for the period 2000 to 2009. i have chosen to use landsat instead of modis cos of the spatial resolution which is too coarse and will make me miss identifying almost all habitats.
i have downloaded landsat for this period with L1T correction and also with imageries that are slc-off. i am using erdas software to achieve this huge task. where do i start from.
do i need to do any further correction on the landsat imageries since they are multi temporal though they are all landsat 7 etm+ and they are L1T status?
how do i go about correcting for the slc off issues?
how do i derive ndvi using erdas? I saw an ndvi tool in erdas and it asks me for the imagery type and it doesn't have landsat etm+ only landsat 7 option. do they mean same imagery? I then tried to do it with the model maker but I cannot even figure it out and how to build the model.
thank you