RasterMosaicker -- have more control as to which value wins

Question

Hi FME'ers,

Is there any way during using RasterMosaicker to use the maximum or minimum value of the entering ratser for the overlapping area instead of the value of the last raster which enters on top

Many Thanks

Abiy

GIS-Analyst

Answer 1 · 2016-03-14T23:14:46Z

Best Answer

Answer by daleatsafe · Mar 14, 2016 at 11:14 PM

This will be in FME 2017.0 -- it is in the internal betas now. The commit comments say:

Added a new Overlapping Values option, which specifies how output cell values will be calculated when multiple rasters overlap. The choices are:

Last

Minimum

Maximum

Average

Sum

Composite Using Alpha Band

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Answer 2 · 2016-02-09T04:26:59Z

Answer by daleatsafe · Feb 09, 2016 at 04:26 AM

We are tracking this internally via PR 54236

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Answer 3 · 2016-01-06T18:49:40Z

Answer by jdh · Jan 06, 2016 at 06:49 PM

If I needed to do this within the current functionality, I would determine the area of overlap, clip the rasters to that area, then use a RasterExpressionEvaluator with a conditional statement to determine the max/min value and send the result of that to the RasterMosaiker on top of the original images.

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Answer 4 · 2016-01-06T17:56:46Z

Answer by daleatsafe · Jan 06, 2016 at 05:56 PM

This is a shortcoming in FME and we plan to add additional modes for merging the values when there is an overlap while mosaiking. The issue is that the pure order of the rasters is not sufficient because you may want to make the decision pixel-by-pixel.

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jdh · Jan 06, 2016 at 06:50 PM 0

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It would be great if we could control the resolution too (max of inputs, min of inputs) rather than 1st feature in sets it.

Answer 5 · 2014-01-13T15:43:20Z

Answer by 1spatialdave · Jan 13, 2014 at 03:43 PM

I don't think so, I believe you'll need to sort the rasters before they enter the mosaicker so they are in the correct order before being conflated.

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RasterMosaicker -- have more control as to which value wins

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