topic Re: Getting zmin zmax of a raster parameter in a tool validation in ArcGIS Desktop 10.7 toolbox Python script in Python Questions

Getting zmin zmax of a raster parameter in a tool validation in ArcGIS Desktop 10.7 toolbox Python script

MarcoBelotti — Thu, 14 Jan 2021 12:43:27 GMT

I am developing a python script tool (my first one). The tool has 3 input parameters:

a raster
z min
z max

I am trying to get automatically z min and z max after the user specify the raster using the validation script but I got this error: TypeError: expected a raster or layer

This is my code (commented lines are other attempts I tried without results):

def updateParameters(self😞
"""Modify the values and properties of parameters before internal
validation is performed.  This method is called whenever a parameter
has been changed."""

if self.params[0].altered:
  if self.params[0].value:
    #rst_ds = self.params[0]
    rst_ds = self.params[0].value
    self.params[1].value = arcpy.Raster(rst_ds).minimum

    #self.params[2].value = arcpy.Raster(rst_ds.replace('\\','/')).maximum
    #arcpy.MakeRasterLayer_management(rst_ds, "rst_lyr")
    #self.params[1].value = arcpy.Raster("rst_lyr").minimum

return

Re: Getting zmin zmax of a raster parameter in a tool validation in ArcGIS Desktop 10.7 toolbox Python script

DanPatterson — Thu, 14 Jan 2021 13:06:05 GMT

Code formatting ... the Community Version - GeoNet, The Esri Community

def updateParameters(self):

Use python for the language... It will make your def happy again

def updateParameters(self):

The parameter type would be "any" and you have to deal with either a raster or a number being added

Re: Getting zmin zmax of a raster parameter in a tool validation in ArcGIS Desktop 10.7 toolbox Python script

DuncanHornby — Sat, 16 Jan 2021 00:52:56 GMT

This question is a cross forum post and has been answered here:

https://gis.stackexchange.com/questions/384285/getting-zmin-zmax-of-a-raster-parameter-in-a-tool-validation-in-arcgis-desktop-1/384310#384310