How to rasterize walls for grid calculations - Revision history

Frank@tygron.nl at 15:54, 30 January 2024

2024-01-30T15:54:16Z

← Older revision		Revision as of 15:54, 30 January 2024
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	* The formula of the [[Combo Overlay]] checks whether the localized average [[DSM]] exceeds the absolute height by at least 1 meter, which generally means that the height of a wall should be at least 2 meters high. By changing the "1" into a lower or higher number, the approximation can be made more or less sensitive respectively.		* The formula of the [[Combo Overlay]] checks whether the localized average [[DSM]] exceeds the absolute height by at least 1 meter, which generally means that the height of a wall should be at least 2 meters high. By changing the "1" into a lower or higher number, the approximation can be made more or less sensitive respectively.
	}}		}}

			[[Category:How-to's]]

Frank@tygron.nl at 11:22, 28 September 2023

2023-09-28T11:22:00Z

← Older revision		Revision as of 11:22, 28 September 2023
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	{{article end		{{article end
	\|notes=		\|notes=
	* This calculations performs an estimation of the locations of walls, and may miss spots. This calculation should therefor not be taken at absolute value, but can be used as a valid estimation in other calculations, such as the percentage of walls which also overlaps with specific [[Distance ~~Sight~~ Overlay\|~~sightlines~~]].		* This calculations performs an estimation of the locations of walls, and may miss spots. This calculation should therefor not be taken at absolute value, but can be used as a valid estimation in other calculations, such as the percentage of walls which also overlaps with specific [[Sight Distance Overlay\|sight-lines]].
	* The formula of the [[Combo Overlay]] checks whether the localized average [[DSM]] exceeds the absolute height by at least 1 meter, which generally means that the height of a wall should be at least 2 meters high. By changing the "1" into a lower or higher number, the approximation can be made more or less sensitive respectively.		* The formula of the [[Combo Overlay]] checks whether the localized average [[DSM]] exceeds the absolute height by at least 1 meter, which generally means that the height of a wall should be at least 2 meters high. By changing the "1" into a lower or higher number, the approximation can be made more or less sensitive respectively.
	}}		}}

Rudolf@tygron.nl at 10:56, 19 September 2023

2023-09-19T10:56:09Z

← Older revision		Revision as of 10:56, 19 September 2023
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	\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)
	\| {{howtoblock \| image=dsm averaging.jpg		\| {{howtoblock \| image=dsm averaging.jpg
	\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: ~~Average~~ DSM \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}		\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: DSM Smoothing \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}
	\| {{howtoblock \| image=wall combo overlay.jpg		\| {{howtoblock \| image=wall combo overlay.jpg
	\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"~~Average~~ DSM" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}		\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"DSM Smoothing" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}
	\| {{howtoblock \| image=wall combo overlay legend.jpg		\| {{howtoblock \| image=wall combo overlay legend.jpg
	\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}		\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}

Rudolf@tygron.nl at 12:00, 18 September 2023

2023-09-18T12:00:18Z

← Older revision		Revision as of 12:00, 18 September 2023
Line 6:		Line 6:
	\| Add a [[Heightmap Overlay]], configured as [[DTM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DTM]], to the [[Project]] (if it does not exist yet)
	\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)
	\| {{howtoblock \| image=		\| {{howtoblock \| image=dsm averaging.jpg
	\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: Average DSM \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}		\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: Average DSM \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}
	\| {{howtoblock \| image=		\| {{howtoblock \| image=wall combo overlay.jpg
	\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"Average DSM" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}		\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"Average DSM" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}
	\| {{howtoblock \| image=		\| {{howtoblock \| image=wall combo overlay legend.jpg
	\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}		\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}
	}}		}}

Rudolf@tygron.nl at 11:55, 18 September 2023

2023-09-18T11:55:45Z

← Older revision		Revision as of 11:55, 18 September 2023
Line 6:		Line 6:
	\| Add a [[Heightmap Overlay]], configured as [[DTM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DTM]], to the [[Project]] (if it does not exist yet)
	\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)
	\| Add an [[Average Overlay]] to the [[Project]]~~.<br>~~Set the averaging to the [[DSM]] [[Heightmap Overlay]].~~<br>~~Set the averaging distance to approximately 2.5 times the [[grid cell size]].		\| {{howtoblock \| image=
	\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration:~~<br>~~A: [[DTM]] Overlay~~<br>~~B:[[DSM]] Overlay~~<br>~~C:[[Average Overlay~~]] of [[DSM]]<br>~~Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1))		\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: Average DSM \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}
	\| Modify the legend of the [[Combo Overlay]] to have only the following values:~~<br>~~Value 0: No wall~~<br>~~Value 1: Wall		\| {{howtoblock \| image=
	~~\| Rename the [[Combo Overlay]] to "Walls"~~		\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"Average DSM" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}
			\| {{howtoblock \| image=
			\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}
	}}		}}

Rudolf@tygron.nl at 09:28, 15 August 2023

2023-08-15T09:28:57Z

← Older revision		Revision as of 09:28, 15 August 2023
Line 10:		Line 10:
	\| Modify the legend of the [[Combo Overlay]] to have only the following values:<br>Value 0: No wall<br>Value 1: Wall		\| Modify the legend of the [[Combo Overlay]] to have only the following values:<br>Value 0: No wall<br>Value 1: Wall
	\| Rename the [[Combo Overlay]] to "Walls"		\| Rename the [[Combo Overlay]] to "Walls"
			}}

			{{article end
			\|notes=
			* This calculations performs an estimation of the locations of walls, and may miss spots. This calculation should therefor not be taken at absolute value, but can be used as a valid estimation in other calculations, such as the percentage of walls which also overlaps with specific [[Distance Sight Overlay\|sightlines]].
			* The formula of the [[Combo Overlay]] checks whether the localized average [[DSM]] exceeds the absolute height by at least 1 meter, which generally means that the height of a wall should be at least 2 meters high. By changing the "1" into a lower or higher number, the approximation can be made more or less sensitive respectively.
	}}		}}

Rudolf@tygron.nl: Created page with "For some calculations, it may be relevant to know where the walls of structures exist. This is a trivial consideration, but a bit more complex to implement in a geographical calculation. However, by using some localized checks on the behavior and local changes of elevation models, it is possible to create a spatial calculation which can find the locations of walls of structures. {{editor location|Overlays}} {{editor steps|title=rasterize walls for grid calculations | A..."

2023-08-15T09:24:53Z

Created page with "For some calculations, it may be relevant to know where the walls of structures exist. This is a trivial consideration, but a bit more complex to implement in a geographical calculation. However, by using some localized checks on the behavior and local changes of elevation models, it is possible to create a spatial calculation which can find the locations of walls of structures. {{editor location|Overlays}} {{editor steps|title=rasterize walls for grid calculations | A..."

New page

For some calculations, it may be relevant to know where the walls of structures exist. This is a trivial consideration, but a bit more complex to implement in a geographical calculation. However, by using some localized checks on the behavior and local changes of elevation models, it is possible to create a spatial calculation which can find the locations of walls of structures.

{{editor location|Overlays}}

{{editor steps|title=rasterize walls for grid calculations
| Add a [[Heightmap Overlay]], configured as [[DTM]], to the [[Project]] (if it does not exist yet)
| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)
| Add an [[Average Overlay]] to the [[Project]]. Set the averaging to the [[DSM]] [[Heightmap Overlay]]. Set the averaging distance to approximately 2.5 times the [[grid cell size]].
| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: A: [[DTM]] Overlay B:[[DSM]] Overlay C:[[Average Overlay]] of [[DSM]] Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1))
| Modify the legend of the [[Combo Overlay]] to have only the following values: Value 0: No wall Value 1: Wall
| Rename the [[Combo Overlay]] to "Walls"
}}

← Older revision		Revision as of 10:56, 19 September 2023
Line 7:		Line 7:
	\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)
	\| {{howtoblock \| image=dsm averaging.jpg		\| {{howtoblock \| image=dsm averaging.jpg
	\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: ~~Average~~ DSM \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}		\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: DSM Smoothing \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}
	\| {{howtoblock \| image=wall combo overlay.jpg		\| {{howtoblock \| image=wall combo overlay.jpg
	\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"~~Average~~ DSM" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}		\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"DSM Smoothing" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}
	\| {{howtoblock \| image=wall combo overlay legend.jpg		\| {{howtoblock \| image=wall combo overlay legend.jpg
	\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}		\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}

← Older revision		Revision as of 12:00, 18 September 2023
Line 6:		Line 6:
	\| Add a [[Heightmap Overlay]], configured as [[DTM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DTM]], to the [[Project]] (if it does not exist yet)
	\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)		\| Add a [[Heightmap Overlay]], configured as [[DSM]], to the [[Project]] (if it does not exist yet)
	\| {{howtoblock \| image=		\| {{howtoblock \| image=dsm averaging.jpg
	\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: Average DSM \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}		\| Add an [[Average Overlay]] to the [[Project]] with the following configuration \| Name: Average DSM \| Set the averaging to the [[DSM]] [[Heightmap Overlay]]. \| Set the averaging distance to approximately 2.5 times the [[grid cell size]]. }}
	\| {{howtoblock \| image=		\| {{howtoblock \| image=wall combo overlay.jpg
	\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"Average DSM" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}		\| Add a [[Combo Overlay]] to the [[Project]] with the following configuration: \| Name: Walls \| Input A: [[DTM]] Overlay \| Input B:[[DSM]] Overlay \| Input C:"Average DSM" Overlay \| Formula: AND(GT(SUB(C, A), 1), GT(SUB(C, B), 1)) }}
	\| {{howtoblock \| image=		\| {{howtoblock \| image=wall combo overlay legend.jpg
	\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}		\| Modify the legend of the [[Combo Overlay]] to have only the following values: \| Value 0: No wall \| Value 1: Wall }}
	}}		}}