Photogrammetry generates information about physical objects through the analysis of photographs. It is used in 3D modeling to generate models and textures in a workflow that can involve Blender. Use this tag for questions about photogrammetry that relate to Blender and not other parts of the workflow.
Photogrammetry is the science and technology of obtaining reliable information about physical objects and the environment through the process of recording, measuring and interpreting photographic images and patterns of electromagnetic radiant imagery and other phenomena. -- Wikipedia
Blender is used in a photogrammetry workflow along with other tools that generate meshes and textures from photographs. Blender is used for editing these meshes or creating shaders for the textures.
Use this tag for questions about photogrammetry that relate to Blender and not other parts of the workflow.