Extracting minimum pixel value from multiple rasters

Question

I am trying to extract minimum values from about 300 raster files (GeoTIFF) - for example an output table containing raster names against their minimum values. I would like to automate the process. I have searched this and found most results use ArcGIS Pro. Is it is possible to replicate the processes in ArcGIS Desktop (and Model Builder)?

I have tried following python code but got error message.

import arcpy

#Get the geoprocessing result object

Result = arcpy.GetRasterProperties_management("D:\New folder\LOSasc.tif", "MINIMUM")

minresult= Result.getOutput(0)`

error message:

Runtime error Traceback (most recent call last): File "", line 3, in File "c:\program files (x86)\arcgis\desktop10.4\arcpy\arcpy\management.py", line 14996, in GetRasterProperties raise e ExecuteError: ERROR 001100: Failed because no statistics are available. Failed to execute (GetRasterProperties)

Is this command correct for what I want? Can it be used for extracting min values from all 300 Geotif? Why am I getting such error?

Answer 1

You can iterate the process in ModelBuilder using raster iterator. You may need two models: one for iteration and another for final output.

First, using raster iterator you can access all rasters stored in a GDB/folder one by one. Run zonal statistics to calculate min value for each iteration and save it to a table by joining. This is a sub-model. You model would look something similar.

In step-2, you call the created sub-model. Direct this main-model to raster data source(GDB/folder), vector file containing boundary, and the field based on the joining would take place. Finally, you can export the result as table or excel file. As you can see, I called sub-model "loop" to iterate all raster images.

A model can be added, as sub-model, to another model by simply clicking on "Add data or tool" button and direct it insite toolbox where the model is saved (or created). I mention this, as I had to spent few good minutes to figure it out when I started using modelBuilder - not many resources dictating step-by-step process to add sub-model.

Answer 2

hi finally I solved it .thank you so much can I answer my question ?