Raster Band type info about node-gdal HOT 7 CLOSED

@brandonreavis and @brandonreavis will know more, but I think the bindings to get at this info should be in place. I just updated an example to work with latest master: 417c566

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Oh, and I'll add that until formal docs are available don't hesistate to look in the c++ code to see what is available: https://github.com/naturalatlas/node-gdal/blob/master/src/gdal_rasterband.cpp#L24-L57. The NODE_SET_PROTOTYPE_METHOD entries add methods you can call like band.toString() and the ATTR entries add properties like band.maximum.

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Ah, thats what GDAL's GetColorInterpretation() function is for (details). I haven't done much with rasters personally, so I only added bindings for the functions that sounded important haha. I haven't touched that method but that should be easy to add. I'll get on that shortly.

Once I add it I think you should be able to do what you want with something like:

console.log("# of bands: "+dataset.bands.count());
dataset.bands.forEach(function(band){
     console.log("band["+band.id+"] color: "+band.colorInterpretation);
})

This also reminds me of another thing I have been thinking about... Do we want to convert all GDAL enums into their string names instead of integers? It would be easier to understand when printed out to the console.

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Also, sorry for the commit that screwed up everything last night hah. I have been trying to keep a crude method/attribute list here, but I havent updated it to reflect last night's change yet. I'll update that today as well.

It can be tricky to understand how to use each function by just glancing at the code sometimes - especially with methods like gdal.open() which is implemented half in JS and half in C++

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Awesome @brandonreavis , thanks for the custom addition! And no worries about the commit yesterday, I had no idea.

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I just updated the list of methods and attributes so its more current and easier to follow. Here it is: (link)

I still need to add the colorInterpretation attribute.

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Alright now you should be able to do what you need!

> var gdal = require('./lib/gdal')
undefined
> var ds = gdal.open('examples/sample.tif')
undefined
> var band = ds.bands.get(1)
undefined
> band.colorInterpretation
'Gray'

The list of all the possible strings is here: (link)

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