Topic: datos
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Files a land surveyor delivers: DWG, GML, PDF and more
What each file you receive after a topographic survey is, what it is for and who uses it: points in TXT or CSV, plans in DWG or DXF, SHP, GML, IVGA, ICUC and PDF.
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Shadow and slope analysis before you design
How we calculate the shadow cast by terrain, buildings and trees at each hour and season, and how a slope map shows where you can build on a plot.
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Drainage networks: why point density changes the result
How the drainage network of a hillside is calculated from the terrain model, and what changes from 0.5 to 5 points per m², with an example in Xàbia (Jávea).
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Why a 3D model: the digital twin of a historic façade
Photogrammetry with a metric camera and classical land surveying to obtain the 3D model and the plan of a historic façade before designing its restoration.
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Vegetation volume with LiDAR: how many lorries are needed
How a drone and LiDAR gave the vegetation volume of a 10,113 m² plot in Xàbia (Jávea) before development, and how many lorries it would take to clear.
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Earthworks volume with drone and LiDAR: the calculation
How excavated volume is calculated by subtracting two terrain models, with the case of an opencast site in the Vall d'Albaida surveyed with drone and LiDAR.
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Orthophoto, DTM, DEM and contour lines explained
What makes an orthophoto different from an aerial photo, a DTM from a DSM, and what contour lines are for, with a large hillside site in Xàbia (Jávea).
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Topographic data sources: imagery, orthophotos, open data
An overview of the main sources of geopositioning and topographic data: satellite imagery, orthophotos, spatial data infrastructures and open data.
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