Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

242
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
242
Plotting of Topographic Maps01:29

Plotting of Topographic Maps

256
Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
256
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

173
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
173
Methods of Obtaining Topography01:25

Methods of Obtaining Topography

176
Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
176
Differential Leveling01:12

Differential Leveling

448
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
448
Energy Line and Hydraulic Gradient Line01:27

Energy Line and Hydraulic Gradient Line

1.6K
Based on Bernoulli's equation, the energy line (EL) and hydraulic grade line (HGL) provide graphical representations of energy distribution in a fluid flow system. For steady, incompressible, inviscid flows, Bernoulli's equation is expressed as:
1.6K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Dynamic Metabolic Profiling and Diagnostic Biomarkers of Acute Graft-Versus-Host Disease Based on Metabolomics.

Biomedical chromatography : BMC·2026
Same author

Identifying Headwater Streams across the Conterminous United States.

Ecosystems (New York, N.Y.)·2026
Same author

Streamflow and Surface-Water Presence Data Availability Across the Conterminous United States: A Review for Headwater Systems.

Hydrological processes·2026
Same author

Novel tripartite <i>CPSF7</i>::<i>RARG</i>::<i>CPSF7</i> fusion confers primary ATRA resistance in atypical acute promyelocytic leukemia.

Haematologica·2026
Same author

Response to Comment on: "Novel ligand-binding domain truncated <i>CPSF7::RARA::CPSF7</i> tripartite fusion confers primary ATRA resistance in atypical acute promyelocytic leukemia".

Haematologica·2026
Same author

Bipartite <i>NUP98</i>::<i>RARA</i>-E412* fusion with a <i>cis</i>-aligned ligand binding domain truncation mutation in atypical acute promyelocytic leukemia.

Haematologica·2026

Related Experiment Video

Updated: Nov 11, 2025

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
09:44

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon

Published on: October 16, 2018

10.5K

Efficient Delineation of Nested Depression Hierarchy in Digital Elevation Models for Hydrological Analysis Using

Qiusheng Wu1, Charles R Lane2, Lei Wang3

  • 1Department of Geography, Binghamton University, Binghamton, New York, USA.

Journal of the American Water Resources Association
|March 29, 2021
PubMed
Summary

This study introduces a novel algorithm for mapping nested surface depressions in digital elevation models (DEMs). The method efficiently quantifies depression hierarchies, crucial for hydrological modeling and understanding water flow.

More Related Videos

Reefshape: A System for the Efficient Collection and Automated Processing of Time-Series Underwater Photogrammetry Data for Benthic Habitat Monitoring
13:35

Reefshape: A System for the Efficient Collection and Automated Processing of Time-Series Underwater Photogrammetry Data for Benthic Habitat Monitoring

Published on: June 13, 2025

928
Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
09:49

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation

Published on: November 18, 2015

12.5K

Related Experiment Videos

Last Updated: Nov 11, 2025

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
09:44

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon

Published on: October 16, 2018

10.5K
Reefshape: A System for the Efficient Collection and Automated Processing of Time-Series Underwater Photogrammetry Data for Benthic Habitat Monitoring
13:35

Reefshape: A System for the Efficient Collection and Automated Processing of Time-Series Underwater Photogrammetry Data for Benthic Habitat Monitoring

Published on: June 13, 2025

928
Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
09:49

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation

Published on: November 18, 2015

12.5K

Area of Science:

  • Geosciences
  • Hydrology
  • Computer Science

Background:

  • Surface depressions in digital elevation models (DEMs) are often removed, hindering detailed hydrological analysis.
  • Existing methods struggle to delineate the complex, nested structures of natural depressions.
  • Understanding depression hierarchy is vital for simulating fill-merge-spill processes and surface connectivity.

Purpose of the Study:

  • To develop an efficient algorithm for delineating and quantifying nested depressions in DEMs.
  • To utilize graph theory and the level-set method for topological analysis of depressions.
  • To provide a robust tool for ecohydrological analysis and watershed modeling.

Main Methods:

  • A novel raster-based level-set algorithm using graph theory.
  • Emulation of decreasing water levels from spill points to depression bottoms.
  • Tracing dynamic topological changes (merging/splitting) within compound depressions.

Main Results:

  • The algorithm successfully delineates and quantifies nested depression hierarchies.
  • Demonstrated significant efficiency gains (~150x faster) compared to vector-based contour tree methods.
  • Generated topological graphs and geometric properties of nested depressions.

Conclusions:

  • The proposed level-set algorithm offers an efficient and accurate method for analyzing nested depressions in DEMs.
  • This approach enhances hydrological connectivity assessment and fill-merge-spill simulations.
  • The algorithm shows strong potential for large-scale ecohydrological and watershed modeling applications.