Extracting pixels with value in one raster but NoData in other raster?

What is the NoData value for raster?

NoData is stored as a mask that is part of the raster dataset, or using a pixel value in the dataset that is not used as a valid value elsewhere in the dataset. For example, -9999 is a common value for storing NoData.

How do I change a NoData cell to a value?

How to change NoData cells to a value

1. Identify the NoData locations with the IsNull tool: Input raster : InRas1. Output raster : OutNullRas.
2. Use Con on the results to give the original NoData areas a value: Input conditional raster : OutNullRas. Expression : “Value = 1” Input true raster or constant value : 100.

How do I remove no data values from raster in ArcGIS?

You can convert no data to zero by using the “Reclassify Tool”. This tool also requires the spatial analyst extension in ArcGIS. This tool allows you to change old raster values to new raster values. The best part is that you can reclassify a range of values.
 

How do I remove no data values from raster Qgis?

Step 1: Right-click on the raster layer and select Properties. Step 2: Go to the Transparency tab, and add “0” as an Additional no data value, since in our case the unnecessary portion of the image is black. That is it!
 

What are null values in GIS?

Null values are a particular type of values that are used to indicate cells where the value for a given layer is not defined.

How do you subtract rasters?

Procedure

1. In ArcMap, navigate to ArcToolbox > Spatial Analyst Tools > Map Algebra > Raster Calculator.
2. In the Raster Calculator window, double-click one of the rasters to be analysed, click the minus sign (-), and double-click the second raster.
3. Specify the name and location for the output raster.
4. Click OK.

How do I remove cells from a certain value?

You can highlight only the range that contains the values you want to remove. Then use the shortcut Ctrl + – (minus on the main keyboard) to get the standard Excel Delete dialog box allowing you to select the Entire row radio button, or any other deleting option you may need.
 

How do I change Nodata value in Qgis?

The other useful step is right-click/export. in this step, you can set pixel values to nodata (Tick the nodata option: add a nodata category: leave ‘from’ blank, and set ‘to’ to 0). this does work with values like -3.40282e+38.

How do I remove a specific value from a cell?

How to remove specific character in Excel

1. Select a range of cells where you want to remove a specific character.
2. Press Ctrl + H to open the Find and Replace dialog.
3. In the Find what box, type the character.
4. Leave the Replace with box empty.
5. Click Replace all.

What are raster values?

Rasters are stored as an ordered list of cell values, for example, 80, 74, 62, 45, 45, 34, and so on. The area (or surface) represented by each cell consists of the same width and height and is an equal portion of the entire surface represented by the raster.

What does raster value mean?

Raster data is stored as a grid of values which are rendered on a map as pixels. Each pixel value represents an area on the Earth’s surface. Vector data structures represent specific features on the Earth’s surface, and assign attributes to those features.

What does a null value in a raster cell represent when it is the result of a map algebra operation?

What does a null value in a raster cell represent when it is the result of a map algebra operation? A null value results when there is no data value in one of the input raster layers at the specified output cell location.