Template:VRT from Rasters: Difference between revisions

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(Created page with "__NOINDEX__ __NOTOC__ ===Merge Elevation Rasters=== <!--====Tool description====--> The ''Merge Elevation Rasters'' tool creates a new raster by merging two or more elevation rasters with priority into a new raster. The resolution of the resulting raster will be the resolution of the principal raster (raster 1). The extents of the resulting raster be expanded from the base of the extent defined by raster 1 to include all other rasters. It should be noted that this opera...")
 
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===Merge Elevation Rasters===
===VRT from Rasters===
<!--====Tool description====-->
<!--====Tool description====-->
The ''Merge Elevation Rasters'' tool creates a new raster by merging two or more elevation rasters with priority into a new raster.
The ''VRT from Rasters'' tool creates a VRT from multiple rasters according to a user specified priority. Each source is added to the VRT in priority order.
The resolution of the resulting raster will be the resolution of the principal raster (raster 1). The extents of the resulting raster be expanded from the base of the extent defined by raster 1 to include all other rasters.


It should be noted that this operation can result in very large rasters. If a low priority raster has a coarser resolution than the primary raster, it will be super sampled to match the resolution of the primary raster in the areas where this raster extends the domain. This super sampling does not provide new data. For this reason, the [[Template:Interpolate Priority Rasters|Interpolate Priority Rasters]] tool is recommended ahead of using this operation.
It should be noted that rasters from different sources may have errors or differences from one another for a variety of  reasons. Principal causes of incompatibilities between rasters include the changes between the times when each source was gathered, differences in survey methods, and slight adjustments to datums. Large raster differences can result in discontinuities in the surface. These discontinuities can have ramifications on the hydraulic results for simulations of flow over the combined surface.


====Input parameters====
====Input parameters====
*''Raster 1'' &ndash; Select the first elevation raster to be merged. This raster will be given the highest priority during the merge.
*''Resample algorithm'' &ndash; Select the method that will be used for interpolation.
*''Blend distance'' &ndash; Enter a distance for the edges of the raster to be blended when merged with another raster. This option can be set for each raster being merged.
**"bilinear" &ndash; Select to use the cubic resampling method when warping a raster's projection.
*''Raster 2'' &ndash; Select second raster to be merged. This raster will have the next highest priority.
**"nearest_neighbor" &ndash; Select to use the nearest neighbor resampling method when warping a raster's projection.
*''Raster n'' &ndash; Additional rasters can be added to the merge with lowering priority. These parameters appear as needed. The last field should be left blank
*''Raster 1 (highest priority)'' &ndash; Select the raster that will be given highest priority during the VRT creation.
*''Raster 2'' &ndash; Select the raster that will be given the next highest priority during the VRT creation.
*''Raster n'' &ndash; Additional rasters may be selected and given priority in the order they are selected.


====Output parameters====
====Output parameters====
*''Merged raster'' &ndash; Enter a name for the new merged raster.
*''Virtual Raster Table (VRT) file'' &ndash; The base name of the VRT file to be created and loaded into SMS.


====Current Location in toolbox====  
====Current Location in toolbox====  
Rasters/Merge Elevation Rasters
Rasters/VRT from Rasters


====Related Tools====
====Related Tools====
* [[Template:Interpolate Priority Rasters|Interpolate Priority Rasters]]
* [[Template:Interpolate Priority Rasters|Interpolate Priority Rasters]]
* [[Template:Merge Elevation Rasters|Merge Elevation Rasters]]


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<noinclude>[[Category:Toolbox Rasters]] </noinclude>
<noinclude>[[Category:Toolbox Rasters]]</noinclude>

Revision as of 05:45, 13 March 2025


VRT from Rasters

The VRT from Rasters tool creates a VRT from multiple rasters according to a user specified priority. Each source is added to the VRT in priority order.

It should be noted that rasters from different sources may have errors or differences from one another for a variety of reasons. Principal causes of incompatibilities between rasters include the changes between the times when each source was gathered, differences in survey methods, and slight adjustments to datums. Large raster differences can result in discontinuities in the surface. These discontinuities can have ramifications on the hydraulic results for simulations of flow over the combined surface.

Input parameters

  • Resample algorithm – Select the method that will be used for interpolation.
    • "bilinear" – Select to use the cubic resampling method when warping a raster's projection.
    • "nearest_neighbor" – Select to use the nearest neighbor resampling method when warping a raster's projection.
  • Raster 1 (highest priority) – Select the raster that will be given highest priority during the VRT creation.
  • Raster 2 – Select the raster that will be given the next highest priority during the VRT creation.
  • Raster n – Additional rasters may be selected and given priority in the order they are selected.

Output parameters

  • Virtual Raster Table (VRT) file – The base name of the VRT file to be created and loaded into SMS.

Current Location in toolbox

Rasters/VRT from Rasters

Related Tools


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