Creates a virtual raster with random pixel values that can be used in raster function templates or mosaic datasets.
A random value is generated for every pixel in the raster.
The Raster Info parameter includes raster dataset properties, such as the number of columns and rows, the number of bands, the pixel type, the extent, and the spatial reference. You can use the current raster information, or select a raster dataset to use as a template.
To select a raster dataset to use as a template, click the Load template raster button next to the Raster Info parameter. Browse to the raster dataset you want to use and select it. This opens the Raster Information table on the dialog box, which allows you to see information about the data source you selected. You can also specify certain parameters (such as the number of bands, the cell size, the pixel depth, and the NoData value) by editing the fields enabled in the table.
While many functions work on one or more input rasters, the Random function does not require an input raster. This means that it behaves more like a raster dataset than a function, so particular care must be taken when adding it to or removing it from the function chain.
The chaining of functions takes place by using the raster created from one function as the input raster for the next one in the chain. Since the Random function requires no input raster, if it is added within a chain, everything that could have been an input to a previous function is no longer required and thus disappears. This makes it possible for your mosaic dataset to become corrupted. Safeguards are in place to prevent adding a Random function before a Mosaic function, thereby protecting the mosaic dataset. Removing the Random function requires some additional steps because of the safeguards. You cannot remove a Random function from a function chain by right-clicking the function and clicking Remove. This is because the function preceding it in the chain (the function that uses it as an input) needs to have a replacement input raster. Removing a Random function uses the same steps as removing or replacing an input raster. Right-click the function that uses the Random function as an input and click Properties. Then change the source of the input raster in the function to use a raster and not the output of the Random function.
Specify the random value distribution method to use.
The seed is an integer value and is used to initiate the random number generator. The default value is 1.
Random Number Generator
Specify the random generator algorithm that uses the seed and distribution to produce a sequence of random numbers. The available options are as follows:
The default value is Mersenne Twister.
Use the Load template raster button to load a template from a directory or portal.