Raster Calculator in QGIS returning ‘nan’ values

How to fill NoData in raster?

With a bit of trial and error, we’ve found the most effective way to fill in NoData cells is using the Close Gaps tool. You can find the Close Gaps tool in the Grid toolbox. Change the input raster to your DEM or any raster data set with holes. Click the Okay button and you’re done.
 

How do I use raster calculator in Qgis?

To add a raster to the raster calculator expression field, double click its name in the Fields list. You can then use the operators to construct calculation expressions, or you can just type them into the box. In the Result layer section, you will need to define an output layer.

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 change raster values in Qgis?

Editing DEM pixels values in QGIS using Serval Plugin

1. Probe button allows you to check the cell values in the raster.
2. Drawing button activate the ability to modify the values of a raster cell.
3. Clicking on the Set raster cell values to NoData button and then in the raster file will set the clicked raster cells to NoData.

How do I fill no data values in Qgis?

Fill raster regions with no data values by interpolation from edges. The values for the no-data regions are calculated by the sourrounding pixel values using inverse distance weighting. After the interpolation a smoothing of the results takes placce. Input can be any GDAL-supported raster layer.

How do I assign a no data value to raster in Qgis?

Quote from video: Set in the raster menu go to extraction. And clip raster by extend. And there you choose the layer for which you want to indicate the node data value and you choose the same layer here for the extent.

How to extract pixel values from raster QGIS?

In QGIS, go to your Processing Toolbox and look for “Raster statistics for polygons”. Then, you set your raster files (yes, you can do more than one at a time, ideal for time series) and your shapefile (polygons). Finally, you choose how to aggregate the extract data, let’s say, the mean pixel values within a polygon.
 

How does raster calculator work?

Raster Calculator is designed to execute a single-line algebraic expression using multiple tools and operators. When multiple tools or operators are used in one expression, the performance of this equation will generally be faster than executing each of the operators or tools individually.

How do you use a raster calculator?

To access the Raster Calculator, select it from the Spatial Analyst toolbar menu. In the dialog box, you can enter Map Algebra in the expression box. The available rasters will be displayed in the Layers list.
 

How do I fill a hole in raster Qgis?

Fixing Data Gaps in QGIS



Set the value 0 for Assign a specified nodata value to output bands option and enter a filename for the converted raster. This tool works on 1 band at a time. Select Band 1 (Red). Set the Maximum distance to search out for values to interpolate to 1, since we have only 1 pixel gap.
 

How do I change the NoData value in Arcgis?

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.

What does the value NoData represent in a raster grid?

Cell values can be either positive or negative, integer, or floating point. Cells can also have a NoData value to represent the absence of data. Sometimes there are homogeneous areas in a raster dataset that the you do not want to display.