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Visibility analysis with mask for non visible areas?

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0

I have LiDAR data and I've made a Digital Surface Model (DSM):

I've made a visibility analysis for 3 buildings with this model:

My goal is to know from where the buildings are visible, not what do you see from them. But as you can see in the orthophoto, there are a few forest areas where the trees block the view of the buildings from the ground level and yet, they appear as visible (from the top of the trees I guess). The same happens with the roof of another building:

Is there any way to use a layer (vector or raster) as a mask for non-visible areas when you run a visibility analysis?

I'm currently working with ArcMap 10.3 but I'm open to suggestions with QGIS 3 as well.

arcgis-desktop arcgis-10.3 dem masking visibility

share|improve this question

edited 6 mins ago

Andre Silva

7,565113682

asked Feb 20 at 9:52

Francesc Cañas SolerFrancesc Cañas Soler

66

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've thought to isolate the buildings and vegetation and make a raster with all the others values as non-data and make a difference with visibility, but it is not accurate either because behind the buildings or vegetation remain as visible and it's not true.
  
  – Francesc Cañas Soler
  Feb 20 at 11:10
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I would be happy to vote to reopen if you update your post with pictures, drawings, screenshots or some other way to clarify what you're asking.
  
  – csk
  Feb 20 at 20:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I hope now is more clear, thanks
  
  – Francesc Cañas Soler
  Feb 22 at 9:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, I mean DSM, sorry for that, translation issues. I used the 3 buildings as observers but my goal is to know from where are they visible, not what do you see from them. From them you see the top of the trees, indeed, but from the ground level of this trees you don't see the Buildings.
  
  – Francesc Cañas Soler
  3 hours ago
  

  
  
  
  

add a comment | 

0

I have LiDAR data and I've made a Digital Surface Model (DSM):

I've made a visibility analysis for 3 buildings with this model:

My goal is to know from where the buildings are visible, not what do you see from them. But as you can see in the orthophoto, there are a few forest areas where the trees block the view of the buildings from the ground level and yet, they appear as visible (from the top of the trees I guess). The same happens with the roof of another building:

Is there any way to use a layer (vector or raster) as a mask for non-visible areas when you run a visibility analysis?

I'm currently working with ArcMap 10.3 but I'm open to suggestions with QGIS 3 as well.

arcgis-desktop arcgis-10.3 dem masking visibility

share|improve this question

edited 6 mins ago

Andre Silva

7,565113682

asked Feb 20 at 9:52

Francesc Cañas SolerFrancesc Cañas Soler

66

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've thought to isolate the buildings and vegetation and make a raster with all the others values as non-data and make a difference with visibility, but it is not accurate either because behind the buildings or vegetation remain as visible and it's not true.
  
  – Francesc Cañas Soler
  Feb 20 at 11:10
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I would be happy to vote to reopen if you update your post with pictures, drawings, screenshots or some other way to clarify what you're asking.
  
  – csk
  Feb 20 at 20:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I hope now is more clear, thanks
  
  – Francesc Cañas Soler
  Feb 22 at 9:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, I mean DSM, sorry for that, translation issues. I used the 3 buildings as observers but my goal is to know from where are they visible, not what do you see from them. From them you see the top of the trees, indeed, but from the ground level of this trees you don't see the Buildings.
  
  – Francesc Cañas Soler
  3 hours ago
  

  
  
  
  

add a comment | 

I have LiDAR data and I've made a Digital Surface Model (DSM):

I've made a visibility analysis for 3 buildings with this model:

My goal is to know from where the buildings are visible, not what do you see from them. But as you can see in the orthophoto, there are a few forest areas where the trees block the view of the buildings from the ground level and yet, they appear as visible (from the top of the trees I guess). The same happens with the roof of another building:

Is there any way to use a layer (vector or raster) as a mask for non-visible areas when you run a visibility analysis?

I'm currently working with ArcMap 10.3 but I'm open to suggestions with QGIS 3 as well.

arcgis-desktop arcgis-10.3 dem masking visibility

share|improve this question

edited 6 mins ago

Andre Silva

7,565113682

asked Feb 20 at 9:52

Francesc Cañas SolerFrancesc Cañas Soler

66

share|improve this question

edited 6 mins ago

Andre Silva

7,565113682

asked Feb 20 at 9:52

Francesc Cañas SolerFrancesc Cañas Soler

66

share|improve this question

edited 6 mins ago

Andre Silva

7,565113682

asked Feb 20 at 9:52

Francesc Cañas SolerFrancesc Cañas Soler

66

edited 6 mins ago

Andre Silva

7,565113682

edited 6 mins ago

Andre Silva

7,565113682

asked Feb 20 at 9:52

Francesc Cañas SolerFrancesc Cañas Soler

66

asked Feb 20 at 9:52

Francesc Cañas SolerFrancesc Cañas Soler

66

2 Answers
2

active

oldest

votes

0

with a dsm, observer will be considered on the surface (top of trees), which is indeed unrealistic. My suggested workaround is to only keep the boundaries of your forest and set the ground level in the middle. You can do this by, e.g.,

1. computing DSM - DEM (which gives you the Digital height model)


2. using focal stat to compute the local minimum of your DHM (in a 3by
   3 window)


3. computing DSM- local min of DHM

share|improve this answer

answered Feb 20 at 14:55

radouxjuradouxju

40.8k143119

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the suggestion. I've tried this and it only improves slightly the result. I guess it depends of the complexity of the area, and may work better in other sites.
  
  – Francesc Cañas Soler
  3 hours ago
  

  
  
  
  

add a comment | 

0

The Visibility tool allows to identify which observer points are visible from each raster surface location, and do support a Mask environment setting:

Tools that honor the Mask environment will only consider those cells that fall within the analysis mask in the operation.

The mask can be a raster or a feature dataset (if feature dataset, it will be converted to raster on the fly). The analysis occur within the mask, so the forest must be left out of it.

share|improve this answer

answered 11 mins ago

Andre SilvaAndre Silva

7,565113682

add a comment | 

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0

with a dsm, observer will be considered on the surface (top of trees), which is indeed unrealistic. My suggested workaround is to only keep the boundaries of your forest and set the ground level in the middle. You can do this by, e.g.,

1. computing DSM - DEM (which gives you the Digital height model)


2. using focal stat to compute the local minimum of your DHM (in a 3by
   3 window)


3. computing DSM- local min of DHM

share|improve this answer

answered Feb 20 at 14:55

radouxjuradouxju

40.8k143119

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the suggestion. I've tried this and it only improves slightly the result. I guess it depends of the complexity of the area, and may work better in other sites.
  
  – Francesc Cañas Soler
  3 hours ago
  

  
  
  
  

add a comment | 

0

with a dsm, observer will be considered on the surface (top of trees), which is indeed unrealistic. My suggested workaround is to only keep the boundaries of your forest and set the ground level in the middle. You can do this by, e.g.,

1. computing DSM - DEM (which gives you the Digital height model)


2. using focal stat to compute the local minimum of your DHM (in a 3by
   3 window)


3. computing DSM- local min of DHM

share|improve this answer

answered Feb 20 at 14:55

radouxjuradouxju

40.8k143119

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the suggestion. I've tried this and it only improves slightly the result. I guess it depends of the complexity of the area, and may work better in other sites.
  
  – Francesc Cañas Soler
  3 hours ago
  

  
  
  
  

add a comment | 

with a dsm, observer will be considered on the surface (top of trees), which is indeed unrealistic. My suggested workaround is to only keep the boundaries of your forest and set the ground level in the middle. You can do this by, e.g.,

1. computing DSM - DEM (which gives you the Digital height model)


2. using focal stat to compute the local minimum of your DHM (in a 3by
   3 window)


3. computing DSM- local min of DHM

share|improve this answer

answered Feb 20 at 14:55

radouxjuradouxju

40.8k143119

share|improve this answer

answered Feb 20 at 14:55

radouxjuradouxju

40.8k143119

answered Feb 20 at 14:55

radouxjuradouxju

40.8k143119

answered Feb 20 at 14:55

radouxjuradouxju

40.8k143119

0

The Visibility tool allows to identify which observer points are visible from each raster surface location, and do support a Mask environment setting:

Tools that honor the Mask environment will only consider those cells that fall within the analysis mask in the operation.

The mask can be a raster or a feature dataset (if feature dataset, it will be converted to raster on the fly). The analysis occur within the mask, so the forest must be left out of it.

share|improve this answer

answered 11 mins ago

Andre SilvaAndre Silva

7,565113682

add a comment | 

0

The Visibility tool allows to identify which observer points are visible from each raster surface location, and do support a Mask environment setting:

Tools that honor the Mask environment will only consider those cells that fall within the analysis mask in the operation.

The mask can be a raster or a feature dataset (if feature dataset, it will be converted to raster on the fly). The analysis occur within the mask, so the forest must be left out of it.

share|improve this answer

answered 11 mins ago

Andre SilvaAndre Silva

7,565113682

add a comment | 

The Visibility tool allows to identify which observer points are visible from each raster surface location, and do support a Mask environment setting:

Tools that honor the Mask environment will only consider those cells that fall within the analysis mask in the operation.

The mask can be a raster or a feature dataset (if feature dataset, it will be converted to raster on the fly). The analysis occur within the mask, so the forest must be left out of it.

share|improve this answer

answered 11 mins ago

Andre SilvaAndre Silva

7,565113682

share|improve this answer

answered 11 mins ago

Andre SilvaAndre Silva

7,565113682

answered 11 mins ago

Andre SilvaAndre Silva

7,565113682

answered 11 mins ago

Andre SilvaAndre Silva

7,565113682