NDLI: A system for 3D error visualization and assessment of digital elevation models

Content Provider	IEEE Xplore Digital Library
Author	Gousie, M.B. Milewski, S.
Copyright Year	2007
Description	Author affiliation: Wheaton Coll., Norton (Gousie, M.B.; Milewski, S.)
Abstract	A digital elevation model (DEM) can be created using a variety of interpolation or approximation methods, any of which may yield errors in the final result. We present DEMEV (DEM Error viewer), a visualization system that displays a DEM and possible errors in 3D, along with its associated contour or sparse data and/or a comparison DEM. The system incorporates several error visualizations. One method compares the test DEM to source data and highlights discrepancies (difference error) beyond a user-variable threshold. A novel, vertical cutting tool can slice the DEM to create a profile view that shows the surface of the test and comparison DEMs simultaneously, allowing the user to discern small errors between the two files in minute detail. The cutting tool is semi-transparent so that the profile is seen in the context of the 3D surface. Another novel error visualization uses height classes to display possible problems with slope in a DEM computed from contours. Other features of the system include visualizations for local curvature and slope, a display of computed statistics such as RMSE, total squared curvature, etc., in addition to typical GIS tools. The system is designed as an error-visualization tool; the above functions are displayed and readily available on the user interface. The system has been tested with USGS data files to show its efficacy.
Starting Page	4064
Ending Page	4067
File Size	1207794
Page Count	4
File Format	PDF
ISBN	9781424412112
DOI	10.1109/IGARSS.2007.4423742
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-23
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital elevation models Data visualization Testing Cutting tools Computer displays Interpolation Approximation methods Three dimensional displays Statistics Geographic Information Systems
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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