How does SET NULL in ArcGIS Pro work?

How does SET NULL in ArcGIS Pro work?

Set Null sets identified cell locations to NoData based on a specified criteria. It returns NoData if a conditional evaluation is true, and returns the value specified by another raster if it is false. If the evaluation of the where clause is true, the cell location on the output raster will be assigned NoData.

Why does the output raster have nodata if no where is specified?

If no where clause is specified, the output raster will have NoData wherever the conditional raster is not 0. The input conditional raster does not affect whether the output data type is integer or floating point. If the input false raster (or constant value) contains floating-point values, the output raster will be floating point.

What happens when the where clause is false in ArcGIS?

If the evaluation of the where clause is true, the cell location on the output raster will be assigned NoData. If the evaluation is false, the output raster will be defined by the input false raster or constant value. If no where clause is specified, the output raster will have NoData wherever the conditional raster is not 0.

When do you set a cell to nodata in ArcGIS?

In this example, any input cell with a value less than 0 will be set to NoData in the output raster, and the remaining cells will retain their original value. In this example, any input cell with a value other than 7 will be set to NoData, and cells that are 7 will be set to value 1 on the output.

How can I change a raster value to zero?

For example, some values might need to be changed to zero. ArcGIS offers a couple options to convert a particular value of a raster dataset to zero. One option is to use the Spatial Analyst Reclassify (reclass) tool to convert a particular value to zero. However, sometimes this might be cumbersome, if a raster has a large range of values.

What happens to the second raster in ArcGIS?

If false, the value of the second input raster is returned. In this example, any input cell with a value less than 0 will be set to NoData in the output raster, and the remaining cells will retain their original value.

What is the input raster in ArcGIS Pro?

Input raster representing the true or false result of the desired condition. It can be of integer or floating point type. The input whose values will be used as the output cell values if the condition is false. It can be an integer or a floating point raster, or a constant value.

What can be used as an output cell in ArcGIS?

The input whose values will be used as the output cell values if the condition is false. It can be an integer or a floating point raster, or a constant value. A logical expression that determines which of the input cells are to be true or false. The expression follows the general form of an SQL expression.

Where do I find null values in ArcMap?

In ArcMap, click the Editor drop-down menu on the Editor toolbar, and select Start Editing. In the Table Of Contents, right-click the selected layer, and select Open Attribute Table. Right-click the field with null values, and click Field Calculator.

How can I check for NULL values in the field?

Starting at ArcGIS for Desktop 10.1, null values in an attribute table are returned as the string ‘None’ in the Field Calculator using Python. Knowing this, an if/elif statement can be used to find whether values are null or not. Here is an example script that checks if a field contains null values: findNulls (!fieldA!)

How to replace null values in a field in Python?

Replace the null values in a single field using the Field Calculator and Python parser In ArcMap, click the Editor drop-down menu on the Editor toolbar, and select Start Editing. In the Table Of Contents, right-click the selected layer, and select Open Attribute Table.

How to set raster values to nodata easily?

1. Run the Spatial Analyst -> Conditional -> Set Null tool 2. Set the input conditional raster to be the raster dataset which you want to change 3. Set the expression to VALUE = 9999 where 9999 is the value that you want to replace with NoData.

When to use 0 as a default value in raster?

For example, 0 may be used as a default value for cells that don’t have a valid value, but 0 may also be used to define valid values in the raster dataset. If this is the case you may need to define a mask. For more information, see the Mask environment setting or the Mask function.

How to remove a nodata value from a raster dataset?

You can also remove a value from being NoData using the raster dataset’s Properties dialog box. NoData values can also be assigned for a mosaic dataset using the Define Mosaic Dataset NoData tool.

What happens to the output raster if the evaluation is false?

If the evaluation is false, the output raster will be defined by the input false raster or constant value. If no where clause is specified, the output raster will have NoData wherever the conditional raster is not 0. The input conditional raster does not affect whether the output data type is integer or floating point.

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