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Apart from NDBI, could you name a few indices for urban expansion? I have done some search on google but haven't found anything that could help me. Perhaps,

What I'm interested is also: road/infrastructure, parks, parking lots, commercial areas development in the urban environment.

Edit:

I need to analyze some orthophotos of a city and to do that I need to apply some indices to my analysis. As for software, I'm going to have at my disposal: ERDAS, ArcGIS, Open Source.

  • What sensor are you working with? – Aaron Jan 3 '15 at 22:17
  • Ok, maybe I haven't expressed myself properly. I need to analyze some orthophotos of a city and to do that I need to apply some indices to my analysis. As for software, I'm going to have at my disposal: ERDAS, ArcGIS, Open Source. – Geosphere Jan 4 '15 at 11:31
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I assume then you are working with the Red, Green, Blue and nIR bands if you have orthophotos. I would start investigating land cover classification using supervised maximum likelihood classification (MLC). Both ArcGIS and Erdas have a variety of tools for image classification, including MLC. If needed, you can include indices as essentially another "band", which allows for more information during the classification. You can add the index to the raster stack in ArcGIS using Composite Bands or in Erdas using the Raster Stack tool.

If you have only 4 spectral bands (R,G,B,nIR), you are fairly limited in the variety of indices available to you. However, I would recommend using NDVI as additional information for your land cover classification. This index is typically used to assess vegetation, although it can also be used to provide information about where vegetation is absent, as would be the case for urban or developed areas.

  • Hey Aaron. Thank you, I'll be using ERDAS for the analysis, but I'll also rely on ArcGIS if something doesn't work in the other software. That is a good way to use NDVI. – Geosphere Jan 4 '15 at 20:46
  • I've looking at ERDAS's documentation and found more about DeltaCue, I wonder if that would help me since it is for change detection. I guess it will. – Geosphere Jan 4 '15 at 22:04

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