DEMリコンディショニングを実行すると、一部のセルがNoDataになってしまいます。

Question

<\/HEAD>最初に水域を平坦化しましたが、特に問題はありませんでした。しかし、その後DEMリコンディショニングを実行すると、一部のセルがNoDataになってしまいます。なぜでしょうか？これは大きな問題です。プロセスのソースコードを入手して確認し、必要に応じて再コーディングする方法はありますか？ <\/P><\/BODY><\/HTML>

KirstenHazler · Answer

Glad to know it's not just me having the issue.  I have since abandoned the DEM Reconditioning tool and wrote my own algorithm in Python, which runs a modified AGREE procedure.  If anyone wants it, feel free to contact me.

BenjaminJackson · Answer

Hi,

I also encountered this problem and I too noticed that it only changed values of 0 to nodata. So I used a workaround that you might find useful: I ran raster calculator on my DEM and added 0.0000001 to all cells in the raster, this in effect removes 0s whilst effectively retaining them. Then I ran reconditioning on the result successfully.

In effect what I actually achieved was simply to convert the raster, since the precision required to add 0.0000001 is not available. I was using an Integer DEM and the resulting layer is Double precision 64bit. So I would suggest trying to convert the raster first and if that does not work, apply raster calculator with a very small number. Hopefully this will be fixed soon.

KirstenHazler · Answer

Update:  I have figured out that anywhere the input DEM is exactly 0, the reconditioning process returns NoData.  Clearly something is wrong with the algorithm.