What Janome JEF is: header, threads, stitches and hoop. How a map becomes a running stitch: a 200×200 mm hoop, 4 stitches per mm and a stitch length limit.
How the hypsometric file is built: a height-to-colour ramp, gdaldem color-relief, transparent voids, multiply-blended shading and GeoTIFF, PNG or JPEG output.
A ROS occupancy grid: an image plus YAML, resolution and origin, three cell states, occupied and free thresholds, and a sanity check before navigation.
What the heightmap archive holds: a square 16-bit PNG, raw R16, georeferencing and a passport with min, max and side length. How to turn that into a Z scale.
What the MP format is: IMG ID, POLYLINE, POLYGON and POI sections, object types, detail levels, label codepages and the road from a text file to a compiled img.
An elevation matrix as text: what the XYZ, CSV or ASCII Grid archive holds, the step and precision, why there is a README and why large frames get coarser.
Inside the HTML map: Leaflet from a CDN, GeoJSON data inline, a layer switcher and attribute popups. What it needs to open and where its limits are.
Inside the elevation GeoTIFF: one Float32 band in metres, declared NoData, compression, your chosen CRS and honest warnings about coarse grids and voids.
Inside QGIS project files: the XML of QGS, the ZIP with QGD in QGZ, relative layer paths, styles, layouts and a project built from a GeoPackage.
Inside DWF 6: the version prefix, the ZIP package, the W2D stream, an A3 sheet and layers. How our map file is built, where to open it, how it differs from DWG.
How to turn KMZ into KML (and back) online or by hand in a minute: KMZ is a ZIP with KML inside. Plus — a converter for OSM data to KML/KMZ and downloading an area straight in the right format.
Got a .rvt file and nothing opens it? RVT is Autodesk Revit's closed format — you need Revit or the free Revit Viewer. And get the city site context for BIM in IFC, DWG or DXF — Revit links them.