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appended answer 293330 as supplemental
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whuber
whuber
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I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a slope map with line shaped artefacts (see pic).

enter image description here

After reading other posts regarding this topic I tried: WARP, (bilinear)RESAMPLING, REPROJECT and changing the DEM from .asc to .tif format. The extention of the DEM is about 4x4 km; the resolution 1x1 m.

@FelixIP Yes, the conversation is with float. What made you think that it could alter the output? @lambertj The crosshatching is "bigger" than the cell size as you can see in the pics.

enter image description here

enter image description here

I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a slope map with line shaped artefacts (see pic).

enter image description here

After reading other posts regarding this topic I tried: WARP, (bilinear)RESAMPLING, REPROJECT and changing the DEM from .asc to .tif format. The extention of the DEM is about 4x4 km; the resolution 1x1 m.

I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a slope map with line shaped artefacts (see pic).

enter image description here

After reading other posts regarding this topic I tried: WARP, (bilinear)RESAMPLING, REPROJECT and changing the DEM from .asc to .tif format. The extention of the DEM is about 4x4 km; the resolution 1x1 m.

@FelixIP Yes, the conversation is with float. What made you think that it could alter the output? @lambertj The crosshatching is "bigger" than the cell size as you can see in the pics.

enter image description here

enter image description here

deleted 20 characters in body; edited tags
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Quarantäne
Quarantäne
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I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a slope map with line shaped artefacts (see pic).

enter image description here

After reading other posts regarding this topic I tried: WARP, (bilinear)RESAMPLING, REPROJECT, putting it in different CRS and changing the DEM from .asc to .tif format. The extention of the DEM is about 4x4 km; the resolution 1x1 m.

I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a slope map with line shaped artefacts (see pic).

enter image description here

After reading other posts regarding this topic I tried: WARP, (bilinear)RESAMPLING, REPROJECT, putting it in different CRS and changing the DEM from .asc to .tif The extention of the DEM is about 4x4 km; the resolution 1x1 m.

I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a slope map with line shaped artefacts (see pic).

enter image description here

After reading other posts regarding this topic I tried: WARP, (bilinear)RESAMPLING, REPROJECT and changing the DEM from .asc to .tif format. The extention of the DEM is about 4x4 km; the resolution 1x1 m.

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Quarantäne
Quarantäne
  • 547
  • 1
  • 3
  • 15

Unwanted artefacts working with Raster analysis

I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a slope map with line shaped artefacts (see pic).

enter image description here

After reading other posts regarding this topic I tried: WARP, (bilinear)RESAMPLING, REPROJECT, putting it in different CRS and changing the DEM from .asc to .tif The extention of the DEM is about 4x4 km; the resolution 1x1 m.