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Editing specific portions of DEM using ArcGIS Desktop?

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1

I currently have a DEM for an east coast city. Unfortunately, the elevation of an area containing a Dam is not accurate. I have the correct elevations as reported by the city. How would I go about editing the elevation values of a specific group of cells so that they accurately reflect the elevation difference of the dam?

For example, here is a portion of the DEM, where the point is the dam:

I need to find a way to select a subset of the nearby DEM cells and edit them so they are accurate with the dam heights.

How do I do this using ArcGIS Desktop?

arcgis-desktop dem

share|improve this question

edited 5 hours ago

PolyGeo♦

54.7k1717 gold badges8686 silver badges257257 bronze badges

asked 9 hours ago

JaredJared

14588 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you looking for a way to manually set the pixel values (e.g. as if it were an Excel spreadsheet) or to replace determined pixels with values from another raster? Where are the correct elevations stored?
  
  – Marcelo Villa
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @MarceloVilla The former; looking to manually change pixel values
  
  – Jared
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And do you have a point for each pixel you want to replace? Or are you looking to manually replace arbitrary pixels around that point?
  
  – Marcelo Villa
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @MarceloVilla Ideally, I'd select a group of pixels in a certain area, and raise their values to a static amount, or just add X to all selected.
  
  – Jared
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you may use a filter expression like "where 2nd_correct_layer is not null 1st_wrong_layer == 2nd_correct_layer", i don't know how to in arc, but in r or qgis it's really simple
  
  – Elio Diaz
  7 hours ago
  

  
  
  
  

 | 
show 1 more comment

1

I currently have a DEM for an east coast city. Unfortunately, the elevation of an area containing a Dam is not accurate. I have the correct elevations as reported by the city. How would I go about editing the elevation values of a specific group of cells so that they accurately reflect the elevation difference of the dam?

For example, here is a portion of the DEM, where the point is the dam:

I need to find a way to select a subset of the nearby DEM cells and edit them so they are accurate with the dam heights.

How do I do this using ArcGIS Desktop?

arcgis-desktop dem

share|improve this question

edited 5 hours ago

PolyGeo♦

54.7k1717 gold badges8686 silver badges257257 bronze badges

asked 9 hours ago

JaredJared

14588 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you looking for a way to manually set the pixel values (e.g. as if it were an Excel spreadsheet) or to replace determined pixels with values from another raster? Where are the correct elevations stored?
  
  – Marcelo Villa
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @MarceloVilla The former; looking to manually change pixel values
  
  – Jared
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And do you have a point for each pixel you want to replace? Or are you looking to manually replace arbitrary pixels around that point?
  
  – Marcelo Villa
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @MarceloVilla Ideally, I'd select a group of pixels in a certain area, and raise their values to a static amount, or just add X to all selected.
  
  – Jared
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you may use a filter expression like "where 2nd_correct_layer is not null 1st_wrong_layer == 2nd_correct_layer", i don't know how to in arc, but in r or qgis it's really simple
  
  – Elio Diaz
  7 hours ago
  

  
  
  
  

 | 
show 1 more comment

I currently have a DEM for an east coast city. Unfortunately, the elevation of an area containing a Dam is not accurate. I have the correct elevations as reported by the city. How would I go about editing the elevation values of a specific group of cells so that they accurately reflect the elevation difference of the dam?

For example, here is a portion of the DEM, where the point is the dam:

I need to find a way to select a subset of the nearby DEM cells and edit them so they are accurate with the dam heights.

How do I do this using ArcGIS Desktop?

arcgis-desktop dem

share|improve this question

edited 5 hours ago

PolyGeo♦

54.7k1717 gold badges8686 silver badges257257 bronze badges

asked 9 hours ago

JaredJared

14588 bronze badges

share|improve this question

edited 5 hours ago

PolyGeo♦

54.7k1717 gold badges8686 silver badges257257 bronze badges

asked 9 hours ago

JaredJared

14588 bronze badges

share|improve this question

edited 5 hours ago

PolyGeo♦

54.7k1717 gold badges8686 silver badges257257 bronze badges

asked 9 hours ago

JaredJared

14588 bronze badges

edited 5 hours ago

PolyGeo♦

54.7k1717 gold badges8686 silver badges257257 bronze badges

edited 5 hours ago

PolyGeo♦

54.7k1717 gold badges8686 silver badges257257 bronze badges

asked 9 hours ago

JaredJared

14588 bronze badges

asked 9 hours ago

JaredJared

14588 bronze badges

1 Answer
1

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3

The filter expression Elio Diaz is describing in the comments can be done via the Con (conditional) tool, either the standalone version or as part of Map Algebra. You would want to follow the examples for complex expressions described here, doing something like this:

Con(dam_layer == NULL, DEM, dam_layer)

(Where there are no dams use DEM, otherwise use the dam values)

This does require the dam values to be in a raster layer, which you could achieve via either Feature to Raster or Point to Raster, using the same environment settings as your DEM (specifically same projection, cell size, and extent).

EDIT: @Marcelo Villa pointed out that Jared wants to adjust the height of multiple pixels around the DEM, in which case you might want to manually create a polygon layer around each dam covering all the pixels to be updated, and then use Feature to Raster (or Polygon to Raster) on this layer instead of the dam points.

share|improve this answer

edited 6 hours ago

answered 7 hours ago

ycartwhelenycartwhelen

56811 silver badge1313 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This would work for just one pixel value (i.e. the pixel where the point representing the dam is). However, @Jared wants to select an arbitrary group of pixels around that point.
  
  – Marcelo Villa
  6 hours ago
  
  

  
  
  
  

add a comment | 

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3

The filter expression Elio Diaz is describing in the comments can be done via the Con (conditional) tool, either the standalone version or as part of Map Algebra. You would want to follow the examples for complex expressions described here, doing something like this:

Con(dam_layer == NULL, DEM, dam_layer)

(Where there are no dams use DEM, otherwise use the dam values)

This does require the dam values to be in a raster layer, which you could achieve via either Feature to Raster or Point to Raster, using the same environment settings as your DEM (specifically same projection, cell size, and extent).

EDIT: @Marcelo Villa pointed out that Jared wants to adjust the height of multiple pixels around the DEM, in which case you might want to manually create a polygon layer around each dam covering all the pixels to be updated, and then use Feature to Raster (or Polygon to Raster) on this layer instead of the dam points.

share|improve this answer

edited 6 hours ago

answered 7 hours ago

ycartwhelenycartwhelen

56811 silver badge1313 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This would work for just one pixel value (i.e. the pixel where the point representing the dam is). However, @Jared wants to select an arbitrary group of pixels around that point.
  
  – Marcelo Villa
  6 hours ago
  
  

  
  
  
  

add a comment | 

3

The filter expression Elio Diaz is describing in the comments can be done via the Con (conditional) tool, either the standalone version or as part of Map Algebra. You would want to follow the examples for complex expressions described here, doing something like this:

Con(dam_layer == NULL, DEM, dam_layer)

(Where there are no dams use DEM, otherwise use the dam values)

This does require the dam values to be in a raster layer, which you could achieve via either Feature to Raster or Point to Raster, using the same environment settings as your DEM (specifically same projection, cell size, and extent).

EDIT: @Marcelo Villa pointed out that Jared wants to adjust the height of multiple pixels around the DEM, in which case you might want to manually create a polygon layer around each dam covering all the pixels to be updated, and then use Feature to Raster (or Polygon to Raster) on this layer instead of the dam points.

share|improve this answer

edited 6 hours ago

answered 7 hours ago

ycartwhelenycartwhelen

56811 silver badge1313 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This would work for just one pixel value (i.e. the pixel where the point representing the dam is). However, @Jared wants to select an arbitrary group of pixels around that point.
  
  – Marcelo Villa
  6 hours ago
  
  

  
  
  
  

add a comment | 

The filter expression Elio Diaz is describing in the comments can be done via the Con (conditional) tool, either the standalone version or as part of Map Algebra. You would want to follow the examples for complex expressions described here, doing something like this:

Con(dam_layer == NULL, DEM, dam_layer)

(Where there are no dams use DEM, otherwise use the dam values)

This does require the dam values to be in a raster layer, which you could achieve via either Feature to Raster or Point to Raster, using the same environment settings as your DEM (specifically same projection, cell size, and extent).

EDIT: @Marcelo Villa pointed out that Jared wants to adjust the height of multiple pixels around the DEM, in which case you might want to manually create a polygon layer around each dam covering all the pixels to be updated, and then use Feature to Raster (or Polygon to Raster) on this layer instead of the dam points.

share|improve this answer

edited 6 hours ago

answered 7 hours ago

ycartwhelenycartwhelen

56811 silver badge1313 bronze badges

share|improve this answer

edited 6 hours ago

answered 7 hours ago

ycartwhelenycartwhelen

56811 silver badge1313 bronze badges

answered 7 hours ago

ycartwhelenycartwhelen

56811 silver badge1313 bronze badges

answered 7 hours ago

ycartwhelenycartwhelen

56811 silver badge1313 bronze badges