Questions tagged [building-heights]

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1answer
57 views

CHM (Canopy height model) = DSM (Digital surface model) - DTM (Digital terrain model)

I want to create a canopy height model (CHM) which has the height of objects (trees, building, etc.) from DSM and DTM. Below is the step by step procedures which I did so far. I use open source s2p ...
4
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2answers
117 views

Creating building shadows in QGIS?

Can anyone think of a simple way to create a polygon to represent building shadows? I have a shapefile with height information for the buildings and I want to create a simple plan looking like the ...
6
votes
1answer
107 views

Using Z-Values instead of attribute Z?

To locate any vertex, it is spatially described with x and y coordinates - of course. You can also add Z and M values - but what is the advantage to use the Z in the vector instead of a attribute Z in ...
0
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0answers
157 views

Extract multiple building height from Google Earth (not DEM)

I'm looking for the height of the Chicago buildings but I can not find them. so I thought to approximate the height using the building:levels field of OSM, multiplying it by 3.5m. But there are ...
1
vote
1answer
63 views

Estimating building and vegetation volume with unclassified LiDAR datasets?

I'm trying to determine the ratio of building to vegetation change (i.e. how has the volume of built structures changed in proportion to the volume of vegetation) in a city over a period of five years....
0
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1answer
124 views

Add building height as obstructions to viewshed analysis in ArcGIS Desktop?

I have LAS data. I have made a DEM from the LAS points. I have a Z-enabled polygon feature representing building footprints. Somehow I need to incorporate the height of the buildings into my DEM so ...
1
vote
1answer
128 views

EMU Building Heights Layer and QGIS

I am new to using QGIS and for a recent project I am looking at the building heights for London. I have managed to download the free EMU Building Heights Layer and added into my existing file, through ...
1
vote
1answer
442 views

Getting buildings multipatch from LiDAR data without building footprints?

I have a 3D LiDAR data and aerial images. Is there a way to obtain the buildings multipatch (.shp), given that I don't actually have the buildings' footprints?
1
vote
1answer
66 views

Know the shadows of a house before building it

Imagine a house/building, seen from outside, at sunrise. As the the sun moves in the horizon, a) the shadow of the house is displaced/deformed, and b) some faces of the house have more/less sunlight ...
1
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2answers
197 views

Mapzen / Tangram topojson building data alternatives

I'm using Vizicities to visualise 3d building data on a map. Vizicities uses Mapzen vector tiles: http://tile.mapzen.com/mapzen/vector/v1/buildings/{z}/{x}/{y}.topojson?api_key=[key] With Mapzen ...
1
vote
1answer
275 views

Buildings height extraction

I am a QGIS new user and I want to extract the buildings height of a territory. I clipped the raster with the LiDar informations with the buildings polygons; after I have extract the contours level ...
4
votes
1answer
164 views

Summing attributes of different shapes into another (height of contours + height of buildings)

I'm using QGIS 2.18. I need to calculate the height of the rooftop of each building in a neighborhood. I have a vector shape of the buildings, with the building height attribute (from the ground to ...
1
vote
1answer
613 views

Heights of buildings using QGIS

I need to display the heights of the buildings from a given map using QGIS. I do have OS vector map district data from ordnance survey (https://www.ordnancesurvey.co.uk/) web site that is supposed to ...
2
votes
1answer
410 views

Extruding building heights from 3D terrain model creates sloped buildings

How can i prevent sloped buildings when I extrude building footprints over sloped terrain? I am using FME to drape 2D features over terrain (SurfaceDraper), then using the Extruder transformer to ...