THE DRONE COLLAB JOURNAL
Explore practical photogrammetry, GNSS, IMU, GIS and remote sensing methods. Technical explanations, worked examples and field checks for the people turning aerial photographs into usable maps.
A digital surface model generally represents visible upper surfaces such as roofs and vegetation, while a digital terrain model aims to describe ground.
Ground classification assigns observations to a terrain interpretation using geometric rules or a model.
An outlier filter identifies points that appear inconsistent with a chosen neighborhood model.
Point density describes how observations are distributed over an area or volume, but its definition must be stated.
A point cloud stores more than a list of visible dots.
A shapefile dataset consists of several related files and carries practical schema limitations.
A GeoPackage can organize spatial layers and attribute tables in a portable database container.
GeoJSON represents features using explicit geometry types and properties.
Resampling estimates output cell values from input samples during reprojection, resizing, or grid alignment.
Two rasters can share a CRS and pixel size while having different grid origins or rotations.
NoData marks an undefined or unavailable sample, while zero can be a legitimate measured value.
Compression changes storage representation, and some methods also change reconstructed values.
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