topic Interpolate a certain range of values in a raster dataset in Elevation Data Questions

Interpolate a certain range of values in a raster dataset

MonaLütjens — Tue, 24 Oct 2017 11:51:29 GMT

Hello everybody,

I am encountering the following problem:

I have an ASTER raster dataset and a bathymetry dataset from a fjord landscape.

My problem is that the bathymetry dataset does not cover values higher than -60 and the ASTER raster does not cover values below 0. Therefore I have the range between 0 and -60 only entered with one single value which gives a very harsh transition.

Is there a workflow/tool in which I can interpolate the range 0--60 with new values so I get a smooth transition?

I have been looking for quite a while and could not find any answers. Thanks in advance for any suggestions that you might have.

Best regards,

Mona

Re: Interpolate a certain range of values in a raster dataset

DanPatterson_Retired — Tue, 24 Oct 2017 11:57:50 GMT

are two separate images? that you are trying to merge? or two separate data sets that you are trying to interpolate

Re: Interpolate a certain range of values in a raster dataset

MonaLütjens — Tue, 24 Oct 2017 12:23:14 GMT

Thanks for you reply. I had two different raster datasets which I have already merged to one. Within this one raster dataset I have this harsh transition I would like to smooth.

Re: Interpolate a certain range of values in a raster dataset

DanPatterson_Retired — Tue, 24 Oct 2017 14:02:42 GMT

You could always export the raster back out to points and reattempt an interpolation from there, but I suspect the results will be less than satisfactory given your description.

Alternately... again, perhaps less than satisfactory... is to run a focal mean over the combined raster to 'smooth' out the transition. Perhaps a larger window size than the default 3x3 (perhaps 5x5, 7x7) will make it look better.

Smoothing should only be considered a 'look nice' operation in this case

Focal Statistics help topic