Remap function

Overview

Allows you to change or reclassify the pixel values of the raster data. This can be done by either of the following:

• Specifying a range of pixel values to map to an output pixel value
• Using a table to map the pixel values to output pixel values

Notes

The output pixel value can be a valid value or a NoData value. There is also an option to map any unspecified values to NoData.

When using the Table option, you can add any table supported by ArcGIS. This option maps a single value to a new value. The table must contain an input and output value field, which you will identify on the dialog box after you add the table.

When using the List option, you enter a range of values by specifying a minimum and maximum value, and assign the range to an output value or to a NoData value. The minimum value in the range is inclusive and the maximum value is exclusive as shown in the following table:

Inclusive-exclusive example

Minimum (inclusive)	Maximum (exclusive)	Actual values converted to output value
1	10	1–9
10	20	10–19
50	51	50

The order of the ranges in the table is also considered. The top row is processed first, and each row below it is processed in order as shown in the following tables:

Example of the effect of order

Minimum (inclusive)	Maximum (exclusive)	Actual values converted to output value
1	15	1–14
10	30	15–29
30	40	30–39

Example of the effect of order

Minimum (inclusive)	Maximum (exclusive)	Actual values converted to output value
10	30	10–29
1	15	1–9
30	40	30–39

Parameters

Parameter	Description
Input Raster	The input raster.
Remap Definition	Choose the option you want to use to set the remap values: List—Specify a range of pixel values to map to an output pixel value Table—Use an input table to map the pixel values to output pixel values
List	Specify the map values and specify the minimum and maximum value range and the new remap values. In addition, the value range can be set as NoData pixels.
Remap Table	Browse to the table that sets your remap values.
Input Field	Choose the field that specifies the input pixel value that will be remapped. If your table has a value range, this will be the minimum value field, and the Input Max Field parameter needs to be specified as well.
Output Field	Choose the field that will be used as the output remapped value.
Input Max Field	Choose the maximum value field if your table specifies a value range.
Remap Table Type	Choose the type of table you'll use to remap your input raster: Simple—Uses the Remap Table input to remap the Input Field pixel values to the corresponding value in the Output Field parameter. This method caches the remap table so that it can perform faster. Dynamic—This method does not cache the remap table and will make a query each time a request is made (pan, zoom, or refresh). If the table changes, the next request can dynamically remap the values accordingly. Reassignment—A specific table used for the reclassification process, where each row in the table will only remap based on each feature boundary.
Change missing values to NoData	Missing values in the reclass table can retain their value or be remapped to NoData. Unchecked—Any pixel from the input raster that does not get reclassed in a remap table will retain its value and be written for its location to the output raster. This is the default. Checked—Any pixel from the input raster that does not get reclassed in a remap table will have its value remapped to NoData for its location to the output raster.