A(n incomplete and growing) list of Map Algebra operations that would be nice to support

[moradology]

Local Operations

• [x] localAdd
• [x] localSubtract
• [x] localDivide
• [x] localMultiply
• [x] reclassify
• [x] mask
• [x] localSqrt
• [x] localRound
• [x] localLog
• [x] localLog10
• [x] localFloor
• [x] localCeil
• [x] localNegate
• [x] unary_- (multiply by -1)
• [x] localNot
• [x] localAbs
• [x] localAcos
• [x] localAsin
• [x] localAtan2
• [x] localAtan
• [x] localCos
• [x] localCosh
• [x] localSin
• [x] localSinh
• [x] localTan
• [x] localTanh

Focal Operations

• [x] focalMin
• [x] focalMax
• [x] focalMode
• [x] focalMedian
• [x] focalMean
• [x] focalSum
• [ ] slope
• [ ] aspect

Zonal Operations

• [ ] Zonal Statistics

Global Operations

• [ ] Distance / Proximity
• [ ] Cost Distance
• [ ] Viewshed
• [ ] Max
• [ ] Min

[rossbernet]

• Zonal operations, Distance, Cost Distance, and Viewshed. These four are part of the ML SBIR scope of work.

Also. I have made this point in conversation, but I'd like to get it down here in the event of discussion

I do not think there should be separate tools/nodes for the majority of the local and focal operations. There can be one tool called Calculator where you can just type in any of the operators (layer1 + layer2 / layer1 - layer2**2) + cos(layer3) etc etc.

Just to do an NDVI would otherwise take 3 nodes of tools. (localAdd, localSubtract, localDivision) versus one tool - calculator

Same for focal - I imagine one tool. With on option to select from [min, max, mean, median, std, etc]