Combo Overlay tutorial - Revision history

Frank@tygron.nl at 13:41, 5 March 2026

2026-03-05T13:41:57Z

← Older revision		Revision as of 13:41, 5 March 2026
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	Then, click on ""Update now" to recalculate the [[Overlay]]s.		Then, click on ""Update now" to recalculate the [[Overlay]]s.

	The result is that for each [[~~Grid Cell~~]], the value of the input Overlay A, which is set to the [[Traffic Noise Overlay]], is used directly as the result.		The result is that for each [[grid cell]], the value of the input Overlay A, which is set to the [[Traffic Noise Overlay]], is used directly as the result.

	Notice that the [[legend]] of the [[Traffic Noise Overlay]] is directly applied as well. ~~this~~ is because the legend of the first input is automatically read out by the [[Combo Overlay]] as the default legend for the [[Combo Overlay]] itself.		Notice that the legend of the [[Traffic Noise Overlay]] is directly applied as well. This is because the legend of the first input is automatically read out by the [[Combo Overlay]] as the default legend for the [[Combo Overlay]] itself.

	[[File:combo-overlay-tutorial-combo-2-small.jpg\|350px\|frame\|center\|The results of the [[Combo Overlay]] directly outputting the results of the [[Traffic Noise Overlay]].]]		[[File:combo-overlay-tutorial-combo-2-small.jpg\|350px\|frame\|center\|The results of the [[Combo Overlay]] directly outputting the results of the [[Traffic Noise Overlay]].]]

Frank@tygron.nl: /* Creating a simple masking calculation */

2025-10-10T14:29:47Z

Creating a simple masking calculation

← Older revision		Revision as of 14:29, 10 October 2025
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	{{editor location\|Overlays\|dropdown=Custom\|3=Combo}}		{{editor location\|Overlays\|dropdown=Custom\|3=Combo}}

	[[File:~~combo-overlay-tutorial-combo-add-small~~.~~jpg~~\|350px\|frame\|center\|Adding the [[Combo Overlay]] from the ribbon.]]		[[File:ComboOverlay_addNew.png\|350px\|frame\|center\|Adding the [[Combo Overlay]] from the ribbon.]]

	{{page break}}		{{page break}}
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	{{page break}}		{{page break}}

	==Rasterizing and combining data==		==Rasterizing and combining data==
	[[Combo Overlay]]s are, in and of themselves, effective tools for manipulating data. However, their effectiveness only goes as far as the input which can be provided to them. Therefor, it is also important to know how to turn other data in the {{software}} into [[Grid Overlay]]s as well.		[[Combo Overlay]]s are, in and of themselves, effective tools for manipulating data. However, their effectiveness only goes as far as the input which can be provided to them. Therefor, it is also important to know how to turn other data in the {{software}} into [[Grid Overlay]]s as well.

Frank@tygron.nl: Undo revision 63197 by Frank@tygron.nl (talk)

2025-10-10T14:29:32Z

Undo revision 63197 by Frank@tygron.nl (talk)

← Older revision		Revision as of 14:29, 10 October 2025
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	{{editor location\|Overlays\|dropdown=Environmental\|3=Traffic Noise}}		{{editor location\|Overlays\|dropdown=Environmental\|3=Traffic Noise}}

	[[File:~~ComboOverlay_addNew~~.~~png~~\|350px\|frame\|center\|Adding the [[Traffic Noise Overlay]] from the ribbon.]]		[[File:combo-overlay-tutorial-traffic-noise-add-small.jpg\|350px\|frame\|center\|Adding the [[Traffic Noise Overlay]] from the ribbon.]]

	{{page break}}		{{page break}}
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	{{page break}}		{{page break}}

	==Rasterizing and combining data==		==Rasterizing and combining data==
	[[Combo Overlay]]s are, in and of themselves, effective tools for manipulating data. However, their effectiveness only goes as far as the input which can be provided to them. Therefor, it is also important to know how to turn other data in the {{software}} into [[Grid Overlay]]s as well.		[[Combo Overlay]]s are, in and of themselves, effective tools for manipulating data. However, their effectiveness only goes as far as the input which can be provided to them. Therefor, it is also important to know how to turn other data in the {{software}} into [[Grid Overlay]]s as well.

Frank@tygron.nl: /* Creating a simple masking calculation */

2025-10-10T14:28:17Z

Creating a simple masking calculation

← Older revision		Revision as of 14:28, 10 October 2025
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	{{editor location\|Overlays\|dropdown=Environmental\|3=Traffic Noise}}		{{editor location\|Overlays\|dropdown=Environmental\|3=Traffic Noise}}

	[[File:~~combo-overlay-tutorial-traffic-noise-add-small~~.~~jpg~~\|350px\|frame\|center\|Adding the [[Traffic Noise Overlay]] from the ribbon.]]		[[File:ComboOverlay_addNew.png\|350px\|frame\|center\|Adding the [[Traffic Noise Overlay]] from the ribbon.]]

	{{page break}}		{{page break}}
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	{{page break}}		{{page break}}

	==Rasterizing and combining data==		==Rasterizing and combining data==
	[[Combo Overlay]]s are, in and of themselves, effective tools for manipulating data. However, their effectiveness only goes as far as the input which can be provided to them. Therefor, it is also important to know how to turn other data in the {{software}} into [[Grid Overlay]]s as well.		[[Combo Overlay]]s are, in and of themselves, effective tools for manipulating data. However, their effectiveness only goes as far as the input which can be provided to them. Therefor, it is also important to know how to turn other data in the {{software}} into [[Grid Overlay]]s as well.

Rudolf@tygron.nl: /* Introduction to the Combo Overlay */

2023-10-18T07:21:22Z

Introduction to the Combo Overlay

← Older revision		Revision as of 07:21, 18 October 2023
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	==Introduction to the Combo Overlay==		==Introduction to the Combo Overlay==
	The [[Combo Overlay]] is a [[Grid Overlay]] which allows for the creation of custom spatial calculation models. It is comparable to raster calculators which can be found in other GIS packages such as ~~QGIs~~. The principle on which it operates is that for each [[grid cell]], other [[Grid Overlay]]s may provide values, and the [[combo Overlay]] uniformly applies a (simple or complex) formula to compute a new resulting value for that [[grid cell]], and does so for all [[grid cell]]s.		The [[Combo Overlay]] is a [[Grid Overlay]] which allows for the creation of custom spatial calculation models. It is comparable to raster calculators which can be found in other GIS packages such as [[QGIS]]. The principle on which it operates is that for each [[grid cell]], other [[Grid Overlay]]s may provide values, and the [[combo Overlay]] uniformly applies a (simple or complex) formula to compute a new resulting value for that [[grid cell]], and does so for all [[grid cell]]s.

	{{page break}}		{{page break}}

	==Creating a simple masking calculation==		==Creating a simple masking calculation==
	To get started with a [[Combo Overlay]], it is basically always neccesary to have some other [[Grid Overlay]] in the same [[Project]] to run a calculation on.		To get started with a [[Combo Overlay]], it is basically always neccesary to have some other [[Grid Overlay]] in the same [[Project]] to run a calculation on.

Rudolf@tygron.nl at 06:44, 5 October 2023

2023-10-05T06:44:57Z

← Older revision		Revision as of 06:44, 5 October 2023
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	The masking clause has been removed, leaving only the traffic noise and conditional addition of the noise from the trains.		The masking clause has been removed, leaving only the traffic noise and conditional addition of the noise from the trains.

	Recalculate, and the results will again cover the entire [[3D ~~visualization~~]].		Recalculate, and the results will again cover the entire [[3D Visualization]].

	[[File:combo-overlay-tutorial-combo-5-small.jpg\|350px\|frame\|center\|The results of just computing the cumulative noise, rather than masking the results.]]		[[File:combo-overlay-tutorial-combo-5-small.jpg\|350px\|frame\|center\|The results of just computing the cumulative noise, rather than masking the results.]]

Rudolf@tygron.nl at 06:44, 5 October 2023

2023-10-05T06:44:30Z

← Older revision		Revision as of 06:44, 5 October 2023
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	{{page break}}		{{page break}}
	Just like with the [[Traffic Noise Overlay]] itself, it is possible to click on any location in the [[~~3d visualization~~]] and see the exact value calculated there.		Just like with the [[Traffic Noise Overlay]] itself, it is possible to click on any location in the [[3D Visualization]] and see the exact value calculated there.

	[[File:combo-overlay-tutorial-combo-2hover.jpg\|350px\|frame\|center\|The hover panel will display the name of the [[Combo Overlay]], and the value of that location.]]		[[File:combo-overlay-tutorial-combo-2hover.jpg\|350px\|frame\|center\|The hover panel will display the name of the [[Combo Overlay]], and the value of that location.]]

Rudolf@tygron.nl: /* Presentation */

2023-05-23T14:06:14Z

Presentation

← Older revision		Revision as of 14:06, 23 May 2023
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	[[File:combo-overlay-tutorial-name3.jpg\|350px\|frame\|center\|Renamed Overlay for noise if the noise is significant.]]		[[File:combo-overlay-tutorial-name3.jpg\|350px\|frame\|center\|Renamed Overlay for noise if the noise is significant.]]

			{{page break}}
	Select the "Train Track vicinity" Overlay (the created Average Overlay), and in the right panel switch to the "Legend" tab.		Select the "Train Track vicinity" Overlay (the created Average Overlay), and in the right panel switch to the "Legend" tab.

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	[[File:combo-overlay-tutorial-legend3.jpg\|350px\|frame\|center\|Select the entries, then click remove at the bottom of the [[right panel]].]]		[[File:combo-overlay-tutorial-legend3.jpg\|350px\|frame\|center\|Select the entries, then click remove at the bottom of the [[right panel]].]]

			{{page break}}
	Change the first entry's color to a dark-grey or black, set the name to "No", and ensure the value is 0.		Change the first entry's color to a dark-grey or black, set the name to "No", and ensure the value is 0.

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	[[File:combo-overlay-tutorial-legend5.jpg\|350px\|frame\|center\|The changed entry, and the fully changed visualization to match.]]		[[File:combo-overlay-tutorial-legend5.jpg\|350px\|frame\|center\|The changed entry, and the fully changed visualization to match.]]

			{{page break}}
	Notice the Overlay now does not show a progressive coloring, but more of a hard-line yes-or-no indication of what is or isn't near the tracks. This is both the only relevant information that can reasonably be read out of the Overlay, and also the way the information is used by the Combo Overlay. This makes the Overlay clearer and more useful to the user who eventually inspects and uses the Overlay or the [[Project]] it is part of.		Notice the Overlay now does not show a progressive coloring, but more of a hard-line yes-or-no indication of what is or isn't near the tracks. This is both the only relevant information that can reasonably be read out of the Overlay, and also the way the information is used by the Combo Overlay. This makes the Overlay clearer and more useful to the user who eventually inspects and uses the Overlay or the [[Project]] it is part of.

Rudolf@tygron.nl: /* Improving operations */

2023-05-23T14:05:45Z

Improving operations

← Older revision		Revision as of 14:05, 23 May 2023
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	[[File:combo-overlay-tutorial-combo-5-small.jpg\|350px\|frame\|center\|The results of just computing the cumulative noise, rather than masking the results.]]		[[File:combo-overlay-tutorial-combo-5-small.jpg\|350px\|frame\|center\|The results of just computing the cumulative noise, rather than masking the results.]]

			{{page break}}
	Add another [[Combo Overlay]].		Add another [[Combo Overlay]].

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	{{page break}}		{{page break}}

	==Presentation==		==Presentation==
	When creating custom [[Overlay]]s, be it with [[Average Overlay]]s or [[Combo Overlay]]s, it is very important to provide information on what the user is looking at. Especially for the relevant results but where possible also for intermediate steps.		When creating custom [[Overlay]]s, be it with [[Average Overlay]]s or [[Combo Overlay]]s, it is very important to provide information on what the user is looking at. Especially for the relevant results but where possible also for intermediate steps.

Rudolf@tygron.nl: /* Rasterizing and combining data */

2023-05-23T14:05:24Z

Rasterizing and combining data

← Older revision		Revision as of 14:05, 23 May 2023
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	[[File:combo-overlay-tutorial-avg-add-small.jpg\|350px\|frame\|center\|Adding an [[Average Overlay]] from the ribbon.]]		[[File:combo-overlay-tutorial-avg-add-small.jpg\|350px\|frame\|center\|Adding an [[Average Overlay]] from the ribbon.]]

			{{page break}}
	Set the "Input" to "Attribute: Specific Layer", and the layer to "BUILDINGS". This will ensure the [[Average Overlay]] is specifically geared towards consululting data from [[Building]]s.		Set the "Input" to "Attribute: Specific Layer", and the layer to "BUILDINGS". This will ensure the [[Average Overlay]] is specifically geared towards consululting data from [[Building]]s.

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	The "Cell averaging distance", which is set to 100m by default, can be left as-is.		The "Cell averaging distance", which is set to 100m by default, can be left as-is.

			{{page break}}
	Finally, click on "Update now" to have the [[Average Overlay]] recalculate.		Finally, click on "Update now" to have the [[Average Overlay]] recalculate.

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	[[File:combo-overlay-tutorial-select-combo.jpg\|350px\|frame\|center\|Re-select the [[Combo Overlay]].]]		[[File:combo-overlay-tutorial-select-combo.jpg\|350px\|frame\|center\|Re-select the [[Combo Overlay]].]]

			{{page break}}
	Add a second input for the calculation. For Grid Overlay B, select the added [[Average Overlay]].		Add a second input for the calculation. For Grid Overlay B, select the added [[Average Overlay]].

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	Instead of simply resuling in the value of A, instead the calculation will result in the combined values of A and either 5 or 0, depending on whether B has a value greater than 0. Since B will have a value slightly more than 0 when near a train track, this formula will now add an additional 5dB to the total result when near a train track.		Instead of simply resuling in the value of A, instead the calculation will result in the combined values of A and either 5 or 0, depending on whether B has a value greater than 0. Since B will have a value slightly more than 0 when near a train track, this formula will now add an additional 5dB to the total result when near a train track.

			{{page break}}
	Click on "Update now" to recalculate the [[Overlay]]s.		Click on "Update now" to recalculate the [[Overlay]]s.

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	{{page break}}		{{page break}}

	==Improving operations==		==Improving operations==
	There is now also a subtle error in this formula. The noise is only increased when the traffic noise in-and-of itself was already at a level of 55 dB. If that level was not reached before taking into consideration the train's noise, the results are already discarded. It would make more sense to first add the train's noise assumption to the calculated noise levels, and then test whether it exceeds some threshold.		There is now also a subtle error in this formula. The noise is only increased when the traffic noise in-and-of itself was already at a level of 55 dB. If that level was not reached before taking into consideration the train's noise, the results are already discarded. It would make more sense to first add the train's noise assumption to the calculated noise levels, and then test whether it exceeds some threshold.