Tag Archives: image processing

A first look at ENVI 5

Excelisvis, the clumsily named successor to ITTVIS, successor to RSI ( I may have missed a few iterations here), has released a new version of ENVI, ENVI 5! I’ve installed the new version and am ready to give my first … Continue reading

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Image classification versus manual mapping

Classification is a common tool for deriving thematic information, such as maps, ¬†from satellite imagery. A range of algorithms have been developed over the years; these are typically broken down into supervised and unsupervised methods. Supervised classification requires the user … Continue reading

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Why ENVI?

There are lots of factors to consider before investing large-ish amounts of money in software. Freeware is increasingly viable for many users. I use ENVI primarily because it is used in teaching at my place of work. ENVI is, I … Continue reading

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SAR freeware: NEST

The European Space Agency (ESA) is a leading provider of free and open software tools. Amongst the packages available are: – BEAM: for processing MERIS and other VIS-IR imagery -NEST: a SAR processing package -PolSARPro: polarimetric SAR tools Here I … Continue reading

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Landsat data processing (in ENVI)

I’ve been asked for advice on processing Landsat data a few times in the last couple of weeks. So, here are a few tips. Accessing data¬† Data can be acquired from a number of sources: http://www.Landsat.org has orthorectified data from … Continue reading

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