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Terrain and hydrological analysis based on LiDAR-derived digital elevation models (DEM)

Project description

lidar Documentation Status

Author: Qiusheng Wu ( |

lidar is a toolset for terrain and hydrological analysis using digital elevation models (DEMs). It is particularly useful for analyzing high-resolution topographic data, such as DEMs derived from Light Detection and Ranging (LiDAR) data.


  • Smoothing DEMs using mean, median, and Gaussian filters (see
  • Extracting depressions from DEMs (see
  • Filtering out small artifact depressions based on user-specified minimum depression size (see
  • Generating refined DEMs with small depressions filled but larger depressions kept intact (see
  • Delineating depression nested hierarchy using the level-set method (see
  • Delineating mount nested hierarchy using the level-set method (see
  • Computing topological and geometric properties of depressions, including size, volume, mean depth, maximum depth, lowest elevation, spill elevation, perimeter, major axis length, minor axis length, elongatedness, eccentricity, orientation, and area-bbox-ratio (see
  • Exporting depression properties as a csv file (see

Using It

Install the Python package using the following command:

pip install lidar

And use:

import os
import pkg_resources
import lidar

# identify the sample data directory of the package
package_name = 'lidar'
data_dir = pkg_resources.resource_filename(package_name, 'data/')

# use the sample dem. Change it to your own dem if needed
in_dem = os.path.join(data_dir, 'dem.tif')
# set output directory. By default, use the temp directory under user's home directory
out_dir = os.path.join(os.path.expanduser("~"), "temp")

# parameters for identifying sinks and delineating nested depressions
min_size = 1000      # minimum number of pixels as a depression
min_depth = 0.5      # minimum depth as a depression
interval = 0.3       # slicing interval for the level-set method
bool_shp = False     # output shapefiles for each individual level

# extracting sinks based on user-defined minimum depression size
out_dem = os.path.join(out_dir, "median.tif")
in_dem = MedianFilter(in_dem, kernel_size=3, out_file=out_dem)
sink_path = lidar.ExtractSinks(in_dem, min_size, out_dir)
dep_id_path, dep_level_path = lidar.DelineateDepressions(sink_path, min_size, min_depth, interval, out_dir, bool_shp)

Check the for more details.


The images below show working examples of the level set method for delineating nested depressions in the Cottonwood Lake Study Area (CLSA), North Dakota. More test datasets (e.g., the Pipestem watershed in the Prairie Pothole Region of North Dakota) can be downloaded from

The following example was conducted on a 64-bit Linux machine with a quad-core Intel i7-7700 CPU and 16 GB RAM. The average running time of the algorithm for this DEM was 0.75 seconds.


The level-set algorithm used in the lidar package has been published in the following articles.

  • Wu, Q., Lane, C.R., Wang, L., Vanderhoof, M.K., Christensen, J.R., & Liu, H. (2018). Efficient Delineation of Nested Depression Hierarchy in Digital Elevation Models for Hydrological Analysis Using Level-Set Methods. Journal of the American Water Resources Association. (forthcoming)



0.1.5 (2018-05-16)

0.1.3 (2018-05-15)

0.1.0 (2018-05-14)

  • First release on PyPI.

Project details

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