function::set_user_long - Linux
Overview
function::set_user_long
is a powerful command used to set the user data associated with a GDAL raster band. This allows developers to store custom information or metadata in a structured and accessible manner.
Syntax
gdal_err set_user_long(Band nBand, int name, long nValue)
Options/Flags
- nBand: The band index for which the user data will be set.
- name: The name of the user data item.
- nValue: The new value to be stored.
Examples
// Set user data named "elevation" with a value of 1000
gdal_err err = set_user_long(band, "elevation", 1000);
// Check if user data named "description" exists
if (band->GetUserLong("description", nullptr) != nullptr) {
// Do something
}
Common Issues
- Name collisions: User data names should be unique within a band to avoid overwriting or ambiguity.
- Type safety: Verify that the value being stored is of type
long
.
Integration
function::set_user_long
can be used in conjunction with other GDAL functions to create complex geospatial applications. For example, it can be combined with function::GetRasterBand()
to access raster bands, and with function::GetRasterCount()
to iterate through all bands in a dataset.