WMS Overlay: Difference between revisions

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The main intent of the WMS Overlay is to offer the ability to expose the color channels of the image data as rasterized data. Each color channel is available as a separate result type. This means the WMS Overlay allows the images to serve as [[prequel|input for other Overlays]] such as the [[Combo Overlay]].
The main intent of the WMS Overlay is to offer the ability to expose the color channels of the image data as rasterized data. Each color channel is available as a separate result type. This means the WMS Overlay allows the images to serve as [[prequel|input for other Overlays]] such as the [[Combo Overlay]].
However, the WMS Overlay can also be used to interpret floating point data of [[GeoTiff]]s hosted by [[GeoShare Viewer]]s on the [[GeoShare]], by accessing its WMS endpoint.
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==Additional information displayed in hover panel==
==Additional information displayed in hover panel==
When clicking on a specific location in the map of the WMS Overlay, the hover panel gives additional information on the color (channel) value in that specific grid cell, depending on the result type.
When clicking on a specific location in the map of the WMS Overlay, the hover panel gives additional information on the color (channel) value in that specific grid cell, depending on the result type.
==Source==
A WMS Overlay obtains its data using the [[Source]] that is configured for it. If this source is a Web Map Service, it can communicate with it. Currently only OGC Web Map Services are supported, ArcGIS Map services are not. Follow this [[How to select a Web Map Service for a WMS Overlay|how-to to configure a source for a WMS Overlay]].
==Layers==
A Web Map Service often provides more than one layer. A WMS Overlay can be configured to obtain data from more than one layer. Each configured layer will be stored in a separate timeframe. Web Map Service layers can be inspected using the Get_Capabilities request. The {{software}} client provides easier means to inspect and add available layers to a WMS Overlay. 


==Result Types==
==Result Types==
The WMS Overlay allows the ARGB color channels of the image data to be accessed as separate grids of data.
The WMS Overlay allows the ARGB color channels of the image data to be accessed as separate grids of data.


{|class=wikitable
{{result types|
! Name
{{:Red result type (WMS Overlay)}}
! Data
{{:Green result type (WMS Overlay)}}
! Value range
{{:Blue result type (WMS Overlay)}}
|-
{{:Alpha result type (WMS Overlay)}}
| Red
{{:Color result type (WMS Overlay)}}
| Value of the red color channel
{{:Float32 result type (WMS Overlay)}}
| 0-255 (0 is no red, 255 is maximum red)
}}
|-
| Green
| Value of the green color channel
| 0-255 (0 is no green, 255 is maximum green)
|-
| Blue
| Value of the blue color channel
| 0-255 (0 is no blue, 255 is maximum blue)
|-
| Alpha
| Value of the opacity channel
| 0-255 (0 is transparent, 255 is fully opaque)
|-
| Color
| Float representation of the ARGB Integer color value
| n/a
|-
| Float32
| Float representation of an integer value. 
| -3.4028235e+38 to 3.4028235e+38
|}


{{article end
{{article end
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* [[How to select a Web Map Service for a WMS Overlay]]
* [[How to select a Web Map Service for a WMS Overlay]]
* [[How to use a WMS to estimate foliage (Heat Overlay)]]
* [[How to use a WMS to estimate foliage (Heat Overlay)]]
* [[How to load grid values from a GeoShare WMS]]
}}
}}


{{WMSOverlay nav}}
{{Overlay nav}}
{{Overlay nav}}
[[Category:WMS]]
[[Category:WMS]]

Latest revision as of 15:11, 2 February 2024

A WMS Overlay, where image data from a Web Map Service is displayed.

The WMS Overlay is a Grid overlay which can display an image result of a Web Map Service query of the project area. Because a Web Map service provides image data, this image data can be displayed as an Overlay in the 3D Visualization.

The main intent of the WMS Overlay is to offer the ability to expose the color channels of the image data as rasterized data. Each color channel is available as a separate result type. This means the WMS Overlay allows the images to serve as input for other Overlays such as the Combo Overlay.

However, the WMS Overlay can also be used to interpret floating point data of GeoTiffs hosted by GeoShare Viewers on the GeoShare, by accessing its WMS endpoint.

Additional information displayed in hover panel

When clicking on a specific location in the map of the WMS Overlay, the hover panel gives additional information on the color (channel) value in that specific grid cell, depending on the result type.

Source

A WMS Overlay obtains its data using the Source that is configured for it. If this source is a Web Map Service, it can communicate with it. Currently only OGC Web Map Services are supported, ArcGIS Map services are not. Follow this how-to to configure a source for a WMS Overlay.

Layers

A Web Map Service often provides more than one layer. A WMS Overlay can be configured to obtain data from more than one layer. Each configured layer will be stored in a separate timeframe. Web Map Service layers can be inspected using the Get_Capabilities request. The Tygron Platform client provides easier means to inspect and add available layers to a WMS Overlay.

Result Types

The WMS Overlay allows the ARGB color channels of the image data to be accessed as separate grids of data.

Icon Result type Unit Mode Description
Overlay icon wms red.png RED byte 0-255 (0 is no red, 255 is maximum red) Value of the red color channel.
Overlay icon wms green.png GREEN byte 0-255 (0 is no red, 255 is maximum green) Value of the green color channel.
Overlay icon wms blue.png BLUE byte 0-255 (0 is no red, 255 is maximum blue) Value of the blue color channel.
Overlay icon wms alpha.png ALPHA byte 0-255 (0 is transparent, 255 is fully opaque) Value of the opacity channel.
Overlay icon wms color.png COLOR byte (0,0,0,0) to (255,255,255,255) Float representation of the ARGB Integer color value.
Overlay icon wms float32.png FLOAT32 byte -3.4028235e+38 to 3.4028235e+38 Float represented by integer bits.

Notes

  • A WMS hosted by the GeoShare for a GeoTIFF can provide float value rasters as WMS images. By using the Float32 format, the WMS images of these rasters are correctly interpreted and converted to float values and ready to use as prequels for other Grid Overlays.
  • When set to use the Color result type, the Overlay's colors are not derived from the Grid Overlay legend. Instead, the float values are converted to ARGB Integer color values.
  • Although the Color result type outputs numerical values, these values are not intended to be re-interpreted in further calculations.
  • The WMS must conform to the following requirement before it can be loaded properly into the Tygron Platform: the WMS must have PNG as output format.
  • When recalculating, the WMS is queried for the latest version of the data. This occurs with each recalculation.

How-to's

See also

WMS Overlay
Result types
Color • Red • Green • Blue • Alpha • Float32


Overlays
Categorization
Grid • Parent • Result Child • Result Parent • Result type
Default
City
Administrative
Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Vacancy
Environmental
Heat Stress • Traffic Density • Traffic Noise • Traffic NO2 • Livability
Water
Rainfall • Flooding • Groundwater • Subsidence • Watershed
Grid Calculation
Average • Combo • Distance • Sight Distance • Travel Distance • Inference • Iteration
Geo Data
GeoTIFF • WCS • WMS • Image • Area • Attribute • Function
Topography
Satellite • Digital Surface Model • Digital Terrain Model • Underground • Source
Network
Network Distance • Network Overview • Network Ownership
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