[GIS] Counting number of pixels/cells with particular value in raster using ArcPy

arcpyraster

I have a raster image containing values ranging from 1 to 10 in Integer format.

I want to count the number of pixel with value = 1.

Is there any method in Arcpy which returns the pixel count if given raster and value as input?

Best Answer

Use the Build Raster Attribute Table tool, then a SearchCursor.

values = {}
arcpy.BuildRasterAttributeTable_management(your_raster, "Overwrite")
with arcpy.da.SearchCursor(your_raster, ['VALUE', 'COUNT']) as rows:
    for row in rows:
        values[row[0]] = row[1]
print values.get(12345, 0)

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[GIS] Counting number of fields in table (or feature class) using ArcPy

To count the number of items in any list (including a list of fields) you can use the Python len function.

For example:

print len(fields)
count = len(fields)

print len(arcpy.ListFields(<table>))
count = len(arcpy.ListFields(<table>))

ArcGIS Desktop – Counting Raster Cells Within a Polygon

You can do this in two steps. First, use Con (Spatial Analyst) to convert cells > 50 to 1 and all other cells to 0. Then use Zonal Statistics as Table (Spatial Analyst) to count the number of "1" cells within your polygon.

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Best Answer

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ArcGIS Desktop – Counting Raster Cells Within a Polygon

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