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Results tagged with lidar
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user 25070
LIDAR (Light Detection and Ranging or Laser Imaging, Detection and Ranging) is an active optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target.
1
vote
Integer vs Non-Integer LiDAR
In "discrete" LiDAR, one pulse coming back to the sensor is recorded as a set of "individual returns", while with full waveform the returning intensité is recorder in one graph with a very short time step …
- 49.9k
4
votes
What is NIR LiDAR?
LiDAR sensors are not "coupled" with NIR sensors. Most LiDAR devices are NIR sensors. … Topographic LiDAR use wavelength in the NIR (most of the time 1550 or 1064 nm) for eye safety reasons. …
- 49.9k
1
vote
Accepted
LIDAR scans of the same location give very different values
I don't know your dataset, but LIDAR DSM are made of point observation in a given field of view, which are resampled in a grid in your case. … A LIDAR also has several returns, so maybe your DSM correspond to the first, second and third returns, hence another difference in height. …
- 49.9k
8
votes
Explaining laser scanning distortions on water surfaces?
In some cases, water will reflect the LIDAR beam away from the sensor (specular effect at some incidence angle) or absorb all its energy (water has a low reflectance in near Infrared.) …
- 49.9k
2
votes
Accepted
Expression into the raster calculator to invert DEM
I would subtact the last pass and the first pass elevation if you want the height. You could also possibly add a constant (e.g. 100) in order to have positive values but this is more an esthetic consi …
- 49.9k
2
votes
Which raster resolution (DEM) can I get out of lidar data with variable grid width?
Make sure that you use an exact interpolator to preserve the elevation at known points, because LIDAR is precise and accurate. …
- 49.9k
5
votes
How to create NDVI map From LiDAR intensity and RGB image
There is no specific GIS software for doing this: most will handle the RGB image and the Lidar data.
Basically, NDVI is (NIR - RED)/(NIR + RED). … As a remark, Lidar does not always provide the intensity information. Sometimes only the distance information is available. …
- 49.9k
1
vote
Setting colour on point cloud data from raster
I suggest that you create a TIN based on your LIDAR data, and use the TIN as base height for your high res aerial photograph (in ArcScene, add the image, right click on it, properties > base height). …
- 49.9k