For the record, the PowerShell code is:
Get-WmiObject -Class Win32_DesktopMonitor | Select-Object ScreenWidth,ScreenHeight
I get the same values in Landscape or in Portrait mode.
UPDATE:
In a multi monitor environment you can get the info for all monitors with:
PS> Add-Type -AssemblyName System.Windows.Forms
PS> [System.Windows.Forms.Screen]::AllScreens
BitsPerPixel : 32
Bounds : {X=0,Y=0,Width=1280,Height=800}
DeviceName : \.DISPLAY1
Primary : True
WorkingArea : {X=0,Y=0,Width=1280,Height=770}
BitsPerPixel : 32
Bounds : {X=1280,Y=0,Width=1920,Height=1200}
DeviceName : \.DISPLAY2
Primary : False
WorkingArea : {X=1280,Y=0,Width=1920,Height=1170}
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