Photogrammetry is the art, science, and technology of information acquisition about physical objects and the environment through the process of recording, measuring, and interpreting aerial photographs (Thomson and Gruner, 1980). Source
Previously aerial photo mapping was very expensive due to the process of recording photos using airplanes, helicopters, hot air balloons and using cameras that were quite large as the times evolved and the huge cost of technology could be overcome by switching to using drone technology / UAV aerial mapping is increasingly because it provides the latest and complete information, according to user needs.
Stages in doing aerial photo mapping
Types of photos
In the process of recording oblique photo images often occur due to several factors
The scale of the photo is compared to the distance of two objects in the photo with the actual distance above the ground. The difference, on a map, the scale will be the same at each point because the map is an orthogonal projection of an appearance on the ground surface. Conversely, an aerial photograph is the result of a central projection which results in a scale varying according to the height of the point concerning a particular reference plane. Source
Pixels are the smallest parts of a digital image. Monitors display images by dividing the screen into thousands (even millions) of pixels, arranged in many rows and columns. These pixels are so close to one another that they look like they are connected. Source
basically the smaller the size of a pixel, the smoother the resulting image
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