Arcengle the processing of a hollow value (Null \ Nodata) value

One, Arcengle value assignment

There are no intrinsic functions found in the engine and can only be handled with GP tools.

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Null value processing Author:allenrobin http://gisrsman.cnblogs.com
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Private Static voidNull2number (Igeodataset Praster,stringoutpath,double number) {            //Check out empty location (NULL location 1, non-null zone is 0)            stringIsnullpath = System.IO.Path.Combine (Application.startuppath,"isnull.tif"); Geoprocessor GP=NewGeoprocessor ();//Initialize GeoprocessorGp. Overwriteoutput =true;//allow the result of an operation to overwrite an existing fileESRI. ArcGIS.SpatialAnalystTools.IsNull ISNULLGP =NewESRI.            ArcGIS.SpatialAnalystTools.IsNull (); Isnullgp.in_raster=Praster; Isnullgp.out_raster=Isnullpath; Gp. Execute (ISNULLGP,NULL); //Set the empty (that is, 1) to 0 and the rest to the original valueGeoprocessor GP1 =Newgeoprocessor (); Gp1. Overwriteoutput=true; ESRI. ArcGIS.SpatialAnalystTools.Con CONGP=NewESRI.            ArcGIS.SpatialAnalystTools.Con (); Congp.in_conditional_raster=Isnullpath; Congp.out_raster=Outpath; Congp.where_clause="Value = 1";//The place where the value=1 is the null to be queried .Congp.in_false_raster_or_constant =Praster; Congp.in_true_raster_or_constant=number;//change NULL to 0 or another value 
Gp1. Execute (CONGP,NULL);
}

Second, the ArcGIS raster data null value processing

Refer to Handling in ArcMap

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When two rasters are superimposed, sometimes there is no data, value is nodata,nodata+ any number =nodata, so when you need to assign values to the raster null values, the conditional query function is used to assign the place of NoData.

1. Null value (Nodata) Assignment:

In the raster calculator, enter the function expression CON (ISNULL ([raster]), 0,[raster]). Where [raster] is the input raster name. A raster image is automatically generated with an external rectangle of the input raster image, where the grid value is not empty and where NoData is 0.

2. A specific value is converted to a null value

Use the function expression SetNull to assign a value of a specific raster value to a null value.

SetNull ([Raster==1],[raster]), the data in the raster value of 1 is empty, and the other retains the original value.

Citation: ArcGIS Raster data null processing

Arcengle the processing of a hollow value (Null \ Nodata) value