Pixelmaßstab

Pixelmaßstab refers to the representation of real-world dimensions within a digital image, specifically in terms of pixels. It establishes a conversion factor between the number of pixels in an image and a corresponding physical measurement, such as meters or inches. Understanding pixelmaßstab is crucial in various fields, including digital imaging, remote sensing, and computer vision, where accurate spatial information is required.

For instance, in aerial photography or satellite imagery, the pixelmaßstab determines how much ground is covered by each pixel. A smaller pixelmaßstab means a higher resolution, where each pixel represents a smaller area on the ground, allowing for more detailed analysis. Conversely, a larger pixelmaßstab indicates a lower resolution. This concept is often expressed as Ground Sample Distance (GSD) or spatial resolution.

In practical applications, knowing the pixelmaßstab allows for measurements to be taken directly from digital images. This can be used for calculating the size of objects, distances between points, or areas of features. Calibration is essential to establish an accurate pixelmaßstab, often achieved by using known reference objects or by understanding the sensor's characteristics and the geometry of image acquisition. Without a defined pixelmaßstab, digital images are merely collections of colored dots, lacking quantitative spatial meaning.