NODATAvalue
NODATAvalue refers to a designated data value used in raster datasets to represent missing or undefined data within a grid. It serves as a sentinel that is not a real measurement, enabling GIS and remote sensing software to distinguish valid grid cells from gaps, masked areas, or areas outside the sensing extent. The term appears in variations such as NoData and missing_value, and is used across multiple formats and tools.
Implementation and formats vary, but the core idea is consistent. In GeoTIFF and other raster formats, a
Practical considerations include choosing a sentinel that does not occur in valid data, ensuring consistent usage