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Geocoordinates to pixel value in GDAL?

Such a program "gdallocationinfo" exists already and it is one of the standard GDAL utilities. The usage is documented in https://gdal.org/programs/gdallocationinfo.html and the source code ...
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Extracting the pixel value of a geocoordinate from a GeoTIFF

First inspect the EXIF tags of geoTiff file using gdal info <geotiff_file> and get the coordinates of the corners of your GeoTiff. In case you want to do this programatically read this thread ...
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Invalid JSON When loading Hosted FeatureLayer from ESRI Portal via ArcGISRuntime C#

Looking at the JSON service metadata, it defines the range domains as a small integer, but it declares the values as strings. So bottom line the service metadata looks invalid.
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