Where to find the nodata value in a raster dataset?

Where to find the nodata value in a raster dataset?

Editing a raster dataset’s NoData value. In the ArcCatalog or the Catalog window, right-click the raster dataset and click Properties. On the General tab, under Raster Information is the NoData Value.

Where do I find the nodata value in ArcGIS?

In the ArcCatalog or the Catalog window, right-click the raster dataset and click Properties. On the General tab, under Raster Information is the NoData Value. Click the Edit button. The NoData Editor dialog box is opened.

Why are there homogeneous areas in a raster dataset?

Sometimes there are homogeneous areas in a raster dataset that the you do not want to display. These can include borders, backgrounds, or other data considered to not have valid values. Sometimes these are expressed as NoData values, although other times they may have real values.

How do you assign a cell to a nodata?

There are two ways to assign the cell value in a raster dataset to be NoData—using the Set Null tool or through the raster dataset’s Properties dialog box. You can also remove a value from being NoData using the raster dataset’s Properties dialog box.

How are features represented in a raster dataset?

As a result, when representing geographic features in a raster dataset, they become collections of cells with the same attribute values but lose their unique identities. Raster data is best used when your primary concern is with the locational relationships of the phenomena represented by geographic features and not the features themselves.

What’s the difference between vector and raster data?

In raster data, the cell typically represents the predominant feature or phenomenon of the area covered by a cell, whereas vector data can accurately delineate or identify individual features. As a result, when representing geographic features in a raster dataset, they become collections…

How is nodata stored in a geodatabase?

For example, -9999 is a common value for storing NoData. In ArcSDE and file geodatabases, if the original raster data contains NoData cells, a bit mask will be generated when loading the raster, and it will be stored in the database. The bit mask will be read, and NoData areas will be extracted at the time of retrieval.

How to assign nodata to a mosaic dataset?

NoData values can also be assigned for a mosaic dataset using the Define Mosaic Dataset NoData tool. This tool allows you to specify more than one NoData value. In the ArcCatalog or the Catalog window, right-click the raster dataset and click Properties. On the General tab, under Raster Information is the NoData Value.

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 change a polygon to a raster?

Use “Polygon to Raster” to change the polygon to a raster. The cells inside the polygon become 1 and the points outside of the polygon are nodata. Use Con (IsNull (Raster),0,NULL) and assign it to Raster2 Add Raster1 and Raster2 to get nodata inside the polygon

How to extract area from a polygon in ESRI?

The Extract by Polygon tool has an extraction area parameter with an outside option which allows cells outside the input polygon to be selected and written to the output raster. All cells inside the polygon receive NoData values on the output raster.

How to set a value to nodata in Map Algebra?

The equivalent using an expression in Map Algebra is as follows: The image below uses an input raster ( InRas1) as the condition. When the value for a cell on InRas1 is true (not 0 or NoData), NoData is assigned to that cell location; otherwise, the value in InRas2 is written as the output value.