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Call for papers on Global DEM Interoperability for the 2016 ISPRS Congress in Prague

Conference announcement and call for papers for the ISPRS Congress to be held in July, 2016 in Prague. http://www.isprs2016-prague.com Working Group IV/3 will be hosting several sessions on Global DEM interoperability and invite your participation in the sessions. All topics related to digital elevation models are welcome including DEM production activities, DEM evaluation/validation methods and results, coastal bathymetry and topography fusion, bare earth retrieval methods, and software for DEM assessment. For further information on topics of interest see the terms of reference for Working Group IV/3 at http://www2.isprs.org/commissions/comm4/wg3.html. Abstract submission is now open on the Congress web site (see: http://www.isprs2016-prague.com/). The deadline for abstract submission is December 13, 2015. Please feel free to forward the call for papers to interested colleagues.

MDEM250m

Available layers:

Download land surface model per Equi7 region:

  • AF(49)
  • AN(23)
  • AS(56)
  • EU(43)
  • NA(30)
  • SA(28)
  • OC(57)

Grid definition:

Projection system: Equi7 grid
Spatial resolution: 250m
Total size: 3.3 GB
proj4:+proj=aeqd

Lineage:

The DEM presented below (projected in equi-distance system hence ready forDEM analysis / flow modelling) was produced as a weighted average between three sources of global DEMs:

The processing steps are explained in detail via the Github repository on WorldGrids. Read more about global DEM data sources: DEM data sources (a review).

Data owner: Public
Reference: Optimisation of global grids for high-resolution remote sensing data


Attachment:

Equi7t3_shp.zip

Fig_Equi7t3_tiling.png

Github repository

Geomorphometry 2015 - Programme

Programme

DAY 1: Monday 22.06.2015

09:00-10:00 REGISTRATION  
10:00-10:30 Welcoming remarks and technical information
(Conference hosts, Chair and Vice-chair)
 
  Session 1: DEM data sources
Chair: Zbigniew Zwoliński
 
10:30-11:00 Invited lecture: Manfred Zink, Alberto Moreira
TanDEM-X: A Challenging Radar Mission for Generating a New Earth’s Topography
 
11:00-11:15 Christopher Wecklich, Carolina Gonzalez, Benjamin Bräutigam
Height Accuracy for the First Part of the Global TanDEM-X DEM Data
 
11:15-11:30 Carlos Grohmann
‘Radiography of the Amazon’ DSM/DTM data: comparative analysis with SRTM, ASTER GDEM
 
11:30-11:45 Piotr Wozniak
High resolution elevation data in Poland
 
11:45-12:00 Shangmin Zhao, Li Wang and Wenjiao Wu
Vertical error distribution of ASTER GDEM V2 data based on ICESat/GLA14 data:taking Shanxi Plateau of China as an example
 
12:00-12:15 COFFEE BREAK  
12:15-12:45 Keynote: Lucian Dragut
Object-oriented geomorphometry
 
12:45-14:00 LUNCH BREAK  
  Session 2: General Problems of Geomorphometry
Chair: Guoan Tang
 
14:00-14:30 Invited lecture: Christopher Crosby
OpenTopography: Enabling Online and On-Demand Access to High-Resolution Topography Data for Natural Hazards
 
14:30-14:45 Zbigniew Zwoliński and Joanna Gudowicz
Geomorphometric analysis of morphoclimatic zones on the Earth
 
14:45-15:00 Vincent Lecours, Vanessa Lucieer, Margaret Dolan and Aaron Micallef
An Ocean of Possibilities: Applications and Challenges of Marine Geomorphometry
 
15:00-15:15 Jozef Minar, Jozef Minar and Ian S. Evans
Towards exactness in geomorphometry
 
15:15-15:30 Karin Ebert, Jerker Jarsjö and Karin Ekstedt
Effects of future sea level rise – the example of the island of Gotland, Sweden
 
15:30-15:45 COFFEE BREAK  
  Session 3: Geomorphometry in Geology and Geomorphology
Chair: Ian Evans
 
15:45-16:00 Liyang Xiong and Guoan Tang
Pre-Quaternary paleotopography reconstruction in the Ordos platform and its integration in the loess landform evolution modeling
 
16:00-16:15 Peter Guth
Geomorphometry of Normal Faults: Abyssal Hills and Continental Rifts
 
16:15-16:30 Marco Bacenetti, Luca Ghiraldi, Marco Giardino and Luigi Perotti
Analysis of morphometric index to evaluate the tectonic activity: case study from Germanasca valley (NW Italy)
 
16:30-16:45 Peter Bandura, Jozef Minár, Tatiana Harciníková and Lucian Drăguţ
Towards delineation of the morphostructural division of the Western Carpathians using object-based image analysis
 
16:45-17:00 Yuichi S. Hayakawa, Hidetsugu Yoshida, Lucian Dragut and Takashi Oguchi
Comparative analysis of manual and automatic extractions of hummock landforms in Mt. Gassan, northwestern Japan
 
17:00-17:15 Domenico Guida, Antonello Cestari, Alba Cuomo, Francesco Dramis, Vincenzo Palmieri and Vincenzo Siervo
The Salerno University Geomorphological Informative Mapping System: the Licosa polygenetic case study (Cilento European geopark, southern Italy)
 
17:30-19:00 Poster Session
Chairs: Jarosław Jasiewicz and Carlos Grohmann
 
19:00-… Geomorphometry society meeting (elections)  

Poster Session

Day 1 Poster Session
Chairs: Jarosław Jasiewicz and Carlos Grohmann
Cheng-Zhi Qin, Xue-Wei Wu, Yanjun Lu, Jing-Chao Jiang and A-Xing Zhu
Case-based formalization of knowledge on digital terrain analysis
Magdy Torab and Nora Dalal
Natural hazards mapping of mega waves on the NW coast of Egypt
Piotr Kłapyta and Natalia Kolecka
Combining laser scanning with field mapping and Schmidt-hammer relative age dating - examples from the Babia Góra range (Westen Carpathians, Poland)
Aleksander Adamczyk, Marcin Sobiech, Agata Urbańska and Wojciech Wysota
Geomorphometric analysis of glacial curvilineations (GCL) in Dobrzyń Lakeland, Central Poland
Lucas Ruiz and Xavier Bodin
Analysis and improvement of surface representativeness of high resolution Pléiades DEMs: Examples from glaciers and rock glaciers in two areas of the Andes
Ruqiao Jiang and Guoan Tang
A Method of Depression Filling with Consideration of Local Micro-relief Features
Marcin Brach and Jarosław Chormański
Comparison of digital elevation models of riparian wetland generated from airborne laser scanning of different accuracy
Edina Józsa
Extracting possible terrace surfaces from digital elevation models – methodological issues and case study from Hungary
Ângelo Moura Araújo, Paulo Pereira, Renato Henriques and Diamantino Pereira
Water resources assessment using GIS procedures: application in Ceará State (Brazil)
Adriana Sărășan and Lucian Drăguț
Assessing contextual information from SRTM data as abasis for classifying landform types. Case study: dune fields
Maciej Hajdukiewicz
The potential accuracy of the survey of landform changes using archival orthophotos: case study of the Białka River valley
Milena Różycka, Aleksandra Michniewicz, Piotr Migoń and Marek Kasprzak
Identification and morphometric properties of landslides in the Bystrzyckie Mountains (Sudetes, SW Poland) based on data derived from airborne LiDAR
Małgorzata Mazurek
Geomorphometric attributes of channel heads initiated by seepage erosion in a postglacial zone (NW Poland)
Virginia Ruiz-Villanueva, Markus Stoffel and Hanna Hajdukiewicz
Understanding large wood deposition during floods: a modelling approach
Cezary Kaźmierowski, Jakub Ceglarek,Jerzy Cierniewski, Jarosław Jasiewicz, Sławomir Królewicz, Michał Wyczałek
Soil surface roughness quantification using DEM obtained from UAV photogrammetry
Barbara Czajka, Adam Łajczak and Ryszard J. Kaczka
The influence of asymmetrical slopes on timberline course at Babia Gora Mountain (Western Carpathians)
Joanna Gudowicz
Effects of DEM quality on SWAT model stream flow and sediment simulation
Ling Jiang, Guoan Tang and Chun Wang
Extraction and analysis of loess gully heads based on grid terrain datasets
Mateusz Kędzior and Jarosław Zawadzki
Comparison of three Topographic Wetness Indices against soil moisture estimates over Vistula basin
Ryszard J. Kaczka, Michał Lempa, Katarzyna Stachniak, Barbara Czajka and Zofia Rączkowska
The geometry of timberline as an indicator of active and inactive avalanche paths
Zbigniew Zwoliński and Estera Stefańska
Relevance of moving window size in landform classification by TPI
Zbigniew Zwoliński and Ewa Sznigir
Spatial distribution of hypsometric curves within the Parsęta River drainage basin (Poland) as a geoindicator of geomorphological hazards

DAY 2: Tuesday 23.06.2015

  Session 4: Processing of High-resolution digital elevation data
Chair: Tomasz Stepinski
9:00-9:30 Invited lecture: Piotr Wezyk
Making the invisible visible – the DTM modelling in complex environments
9:30-9:45 Waldemar Kociuba
Geometrical parameters of TLS-based DEM acquisition for a small Arctic catchment (Svalbard SW)
9:45-10:00 Marjan Temovski and Ivica Milevski
DEM based geomorphometric analyses of karst surface in the Republic of Macedonia
10:00-10:15 Michal Gallay, Ján Kaňuk, Jaroslav Hofierka, Zdenko Hochmuth and John Meneely
Mapping and geomorphometric analysis of 3-D cave surfaces: a case study of the Domica Cave, Slovakia
10:15-10:30 Marek Kasprzak, Artur Sobczyk, Szymon Kostka and Anna Haczek
Surface geophysical surveys and LiDAR DTM analysis combined with underground cave mapping – an efficient tool for karst system exploration: Jaskinia Niedźwiedzia case study (Sudetes, SW Poland)
10:30-10:45 COFFEE BREAK
  Session 5: Landscape modeling using DEM
Chair: Tomislav Hengl
10:45-11:00 Ian Evans and Nicholas J. Cox
Size and shape of glacial cirques
11:00-11:15 Andrea Mandarino, Francesca Ferraris and Marco Firpo
Understanding landscape evolution by using DEM analysis, low order channels gradient and Asymmetry Factor: the case study of the upper Scrivia river basin (Northern Apennines, Italy)
11:15-11:30 Fayuan Li and Mingwei Zhao
Slope landscape change in a simulated watershed
11:30-11:45 Ivica Milevski and Anita Milevska
Improvement of slope angle models derived from medium to fine-scale DEM’s Key study: Skopje area
11:45-12:00 COFFEE BREAK
12:00-12:30 Invited lecture: Tomasz Niedzielski, Bartlomiej Mizinski, Dapeng Yu
Hydrological forecasting in real time: an experimental integrated approach
  Keynote: Markus Metz
Searching for water: hydrological modelling concepts in GRASS GIS
12:30-13:45 LUNCH BREAK
  Session 6: Hydrological Modeling using DEM
Chair: Josef Minar
14:00-14:15 Jarosław Jasiewicz, Jolanta Czerniawska
Conditional hydrological simulations as a tool for analysis of denudational transformation of post-glacial plains
14:15-14:30 Laura Coco, Viviana Cestrone and Marcello Buccolini
Geomorphometry for studying the evolution of small basins: an example in the Italian Adriatic foredeep
14:30-14:45 Libor Burian, Andrey Mitusov and Poesen
Relationships of attributes of gullies with morphometric variables
14:45-15:00 Adam Łajczak, Barbara Czajka and Ryszard Kaczka
Reinterpretation of morphometry of headwater areas using LiDAR data in homoclinal flysch mountain ridge modelled by landslides. Case study of the Babia Góra Mt., the Western Carpathians
15:00-15:30 COFFEE BREAK
  Session 7: Morphometric parameters
Chair: Helena Mitasova
15:30-15:45 Ovidiu Csillik, Ian S. Evans and Lucian Drăguț
Automated transformation of slope and surface curvatures to avoid long tails in frequency distributions
15:45-16:00 Xiaoli Huang, Kai Liu and Liyang Xiong
The Influence of DEM Resolution on the Extraction of Terrain Texture
16:00-16:15 Bartlomiej Szypula
Relief Index (RI) as a simple tool for geomorphometry
16:15-16:30 Shuanglin Liu, Fayuan Li, Ruqiao Jiang, Ruixue Chang and Wei Liu
A Method of Automatic Topographic Recognition Based on Slope Spectrum
16:30-16:45 Vincent Lecours, Alvin Simms, Rodolphe Devillers, Vanessa Lucieer and Evan Edinger
Finding the Best Combinations of Terrain Attributes and GIS software for Meaningful Terrain Analysis
16:45-17:00 Scott Peckham
Longitudinal Elevation Profiles of Rivers: Curve Fitting with Functions Predicted by Theory
19:00– Conference dinner

DAY 3: Wednesday 24.06.2015

  Session 8: Novel approches in geomorphometry
Chair: Steve Kopp
9:00-9:30 Invited lecture: Tomasz F. Stepinski, Jaroslaw Jasiewicz, Pawel Netzel and Jacek Niesterowicz
Doing Geomorphometry with Pattern Analysis
9:30-9:45 Przemysław Stpiczyński, Dominik Szałkowski, Leszek Gawrysiak and Łukasz Chabudziński
Hybrid implementation of evaluation of primary topographic parameters using GPU-accelerated clusters
9:45-10:00 Sergio Camiz and Maurizio Poscolieri
Geomorfo: a program for the classification of terrain units
10:00-10:15 Jarosław Jasiewicz, Alfred Stach, Jakub Nowosad
Terrain misclassification problem – analysis using pattern simulation approach
10:15-10:30 Anita Bernatek
Visualizing morphometric changes in a piping system using DEM and GIS analysis: the Bieszczady Mts., Poland
10:30-10:45 COFFEE BREAK
  Session 9: Monitoring of natural hazards I
Chair: Marco Giardino
10:45-11:00 Charles Jackson
Caution: dust storms may do exist (and so do mountains): Modeling dust source suitability within an object-oriented geoecology
11:00-11:15 Viktor Kaufmann and Andreas Kellerer-Pirklbauer
Regional quantification of rock glacier movement in Central Austria using governmental GIS data
11:15-11:30 Rafal Wawer and Artur Lopatka
Thermal satellite scenes in single event modelling of wind erosion
11:30-11:45 Vaclav Petras, Helena Mitasova and Anna Petrasova
Mapping gradient fields of landform migration
11:45-12:00 COFFEE BREAK
12:00-12:30 Keynote: Marco Giardino, Luigi Perotti, Walter Alberto, Sara Ratto
Multidimensional approach to natural instabilities in mountain areas: how geomorphometry can improve both hazard modelling and risk perception
12:30-13:45 LUNCH BREAK
  Session 10: Monitoring of natural hazards II
Chair: Marco Giardino
13:45-14:15 Invited lecture: Steve Kopp
[Expanding the reach of Geomorphometry through Web GIS
14:15-14:30 Janusz Wasowski, Fabio Bovenga, Raffaele Nutricato, Davide Oscar Nitti and Maria Teresa Chiaradia
High resolution satellite SAR multi temporal interferometry for regional scale detection of landslide and subsidence hazards
14:30-14:45 François Clapuyt, Veerle Vanacker, Kristof Van Oost and Fritz Schlunegger
Very-high resolution monitoring of movement of surface material within a landslide
14:45-15:00 Xavier Bodin, Dario Trombotto and Alvaro Soruco
Evaluation of a terrestrial photogrammetry method for the study of high mountain dynamics. Quebrada del Medio rock glacier, Mendoza, Argentina
15:00-15:15 COFFEE BREAK
  Session 11: Geomorphometry for natural hazards geomodeling
Chair: Piotr Weżyk
15:15-15:30 Mario Kummert and Reynald Delaloye
Quantifying sediment transfer between the front of an active alpine rock glacier and a torrential gully
15:30-15:45 Rafał Kroczak and Tomasz Bryndal
An attempt to assess the influence of road network on flash flood wave parameters. The case study of the Carpathian Foothills
15:45-16:00 Mihai Niculita
Automatic extraction of landslide flow direction using geometric processing and DEMs
16:00-16:15 Daniele Strigaro, Massimiliano Moretti, Matteo Mattavelli, Mattia De Amicis, Valter Maggi and Antonello Provenzale
Development of GIS methods to assess glaciers response to climatic fluctuations: a Minimal Model approach
16:30-17:15 Life achievement awards / Best paper awards
Towards Geomorphometry 2017
17:15– Short Trip: Meteorite crater Morasko

DAY 4: Thursday 25.06.2015

Parrallel workshops

Room Morning
9:00-12.30
Afternoon
13:30-17:00
  Jarek Jasiewicz
GRASS GIS and R as a tool for large-scale geomorphometric mapping
Jarek Jasiewicz, Markus Metz
Hydrological modeling in GRASS GIS
  Jonathan de Ferranti/Jacek Niesterowicz
World-wide DEM
Tom Hengl
Automated DEM data analysis using R + SAGA + Google Earth
  ESRI
ESRI ArcGIS Pro – new desktop application from Esri
ESRI
ESRI ArcGIS Pro – new desktop application from Esri
  Martin Isenburg
Hands-on intro to LiDAR processing with LAS tools
Fabio Bovenga, Janusz Wasowski
Radar interferometry for ground motion analysis

DAY 5: Friday, 8:00 A.M 26.06.2015

All-day conference trip

Adam Mickiewicz Square, City Centre near Adam Mickiewicz Monument

Mirosław Makohonienko, Małgorzata Mazurek

Transformation (normalization) tool

Short title: transform

Inputs: Slope raster or curvature raster; any other variables with skewed or long-tailed distributions
Outputs: Normalized slope or curvature raster; a text file informing about transformation used and new skewness/kurtosis.

For INSTRUCTIONS, please visit: http://research.enjoymaps.ro/downloads/

Reference:
Csillik, O., Evans, I.S., Drăguţ, L., 2015. Transformation (normalization) of slope gradient and surface curvatures, automated for statistical analyses from DEMs. Geomorphology 232(0): 65-77.

Purpose and use:

Automated procedures are developed to alleviate long tails in frequency distributions of morphometric variables. They minimize the skewness of slope gradient frequency distributions, and modify the kurtosis of profile and plan curvature distributions towards that of the Gaussian (normal) model. Box-Cox (for slope) and arctangent (for curvature) transformations are used. The transforms are applicable to morphometric variables and many others with skewed or long-tailed distributions. It is suggested that such transformations should be routinely applied in all parametric analyses of long-tailed variables. Our Box-Cox and curvature automated transformations are based on a Python script, implemented as an easy-to-use script tool in ArcGIS.

Programming environment: Python
Status of work: Public Domain

Transformation-Tools.zip

Geomorphometry Newsletter November 2014

This is to remind all our members that the submission deadline for the Geomorphometry.org/2015 is due in 5 days i.e. on 28th of November. If you plan to participate in the Geomorphometry.org/2015 conference next year in Poznan, this is your last chance to submit an extended abstract and compete for one of the oral talks. Please note that there will be no extensions of this deadline! For more information please feel free to contact the organizing committee.

Instructions: To submit a 2-4 pages summary papers for the Geomorphometry 2015 use the EasyChair conference system. Do not submit your work by e-mail. Do not submit MS word documents but only PDF versions of your paper. Detailed instructions on how to preprare you extended abstract and how to submit it are available here. Each submission will go through a peer-review process and will be rated by the members of the scientific committee. Revisions and final acceptance of the extended abstracts will be closed in February 2015. After that we will publish the working programme of the conference and open the full registrations. We look forward to seeing you in Poznan!!

Important dates:

  • Extended abstracts due: 28 November 2014
  • Notification of acceptance (revisions): 1 February 2015
  • Workshop proposals due: 1 February 2015
  • Final camera-ready digital manuscripts due: 1 May 2015
  • Early registration deadline: 1 May 2015
  • Conference date: 22-26 June 2015

At Geomorphometry.org/2015 We are expecting a number of exciting keynotes, invited lectures and workshops. Here is one more time the complete list:

  • Marco Giardino, School of Natural Sciences, University of Torino, Italy: “Multidimensional approach to natural instabilities in mountain areas: how geomorphometry can improve both hazard modelling and risk perception”
  • Markus Metz, GRASS Development Team, Fondazione Edmund Mach, Trento, Italy: “Searching for water: hydrological modelling concepts in GRASS GIS”
  • Lucian Drăguţ, West University of Timisoara, Romania: “Object-oriented geomorphometry”
  • Tomasz Stepinski, Space Informatics Lab, University of Cincinnati, Ohio, United States: “Doing Geomorphometry with Pattern Analysis”
  • Piotr Wężyk, Laboratory of Geomatics, University of Agriculture in Krakow, Poland: “Making the invisible visible – the DTM modelling in complex environment”
  • Alberto Moreira, Microwaves and Radar Institute, German Aerospace Center, Oberpfaffenhofen, Germany: “TanDEM-X: A Challenging Radar Mission for Generating a New Earth’s Topography”
  • Christopher Crosby, Open Topography Group, United States: “OpenTopography: Enabling Online and On-Demand Access to High-Resolution Topography Data for Natural Hazards”
  • Tomasz Niedzielski, Institue of Geography and Regional Development, University of Wrocław, Poland: “Hydrological forecasting in real time: an experimental integrated approach”
  • Steve Kopp, Environmental System Research Institute, Redlands, CA, United States: “Expanding the reach of Geomorphometry through Web GIS”

WorldDEM, the new global elevation data set with resolution of 12 m and amazing vertical accuracy of <±2 m (http://www.astrium-geo.com/worlddem/) is now available for pre-order. See availability of the finished tiles at http://worlddem-database.infoterra.de/

If you are looking for high resolution global full coverage DEM data (based on the SRTM DEM), Christoph Hormann and Jonathan de Ferranti have prepared a public repository where you can download 3’’ arcsec resolution data (http://www.viewfinderpanoramas.org/dem3.html) at no cost. The authors claim that these tiles have been filled and corrected from the best available alternative sources. See also external links to an independent review, and some photographic comparisons.

Geomorphometry community is now also on G+. Join this community and post opinions, announcements and short stories and follow up the work of your colleagues…

Latest Posts

Whitebox Workflows Next Gen released

Whitebox Workflows Next Gen, a complete rewrite of the Whitebox geospatial analysis platform, is now publicly available for Python, R, and QGIS.

Built from the ground up in pure Rust, Whitebox Next Gen provides more than 700 geospatial analysis tools for geomorphometry, terrain analysis, spatial hydrology, LiDAR processing, remote sensing, vector GIS, and spatial statistics. All three interfaces run on the same high-performance backend, allowing users to work in scripts, notebooks, statistical workflows, or a familiar desktop GIS environment.

Whitebox Next Gen is not an incremental update to the previous Whitebox architecture. It replaces the earlier monolithic system with a modular, full-stack geospatial platform. Core capabilities for raster and vector I/O, coordinate systems and reprojection, vector topology, spatial indexing, LiDAR processing, and other foundational operations are implemented directly within the Whitebox codebase rather than delegated to external C or C++ GIS libraries. This approach provides consistent cross-platform behaviour, fewer system-level dependencies, tighter control over performance and correctness, and greater flexibility for continued research and development

Highlights

  • More than 700 tools for geomorphometry, hydrology, LiDAR, remote sensing, vector analysis, spatial statistics, and general geospatial processing
  • Publicly available interfaces for Python, R, and QGIS
  • A modular, high-performance backend written entirely in Rust, including wbprojection, wbraster, wbvector, wblidar, wbspatialstats, and wbtopology open-source (MIT/Apache licensed) backend libraries
  • Most of the 80+ tools that existed within the previous extension product have been migrated to the new Whitebox open core, including the tools for advanced surface curvature analysis and DEM processing
  • Native coordinate-reference-system handling and reprojection workflows via wbprojection
  • Expanded raster support (19 formats), including GeoTIFF, Cloud-Optimized GeoTIFF (COGs), GeoPackage Raster, and JPEG2000
  • Expanded vector support (12 formats), including Shapefile, GeoPackage, FlatGeobuf, GeoParquet, GeoJSON, TopoJSON, and GML
  • Modern point-cloud support, including LAS, LAZ, COPC, E57, and PLY
  • A dedicated topology engine supporting robust vector analysis, network analysis, route-event workflows, and linear referencing
  • Local-first processing on Windows, macOS, and Linux
  • A consistent analysis platform across Python scripts and R workflows
  • A newly updated and more advanced QGIS Processing toolbox

Whitebox has particular strengths in terrain analysis, geomorphometry, spatial hydrology, and LiDAR processing. Whitebox Next Gen carries these areas forward while substantially expanding the project’s capabilities for vector analysis, remote sensing, modern spatial data formats, and reproducible geospatial workflows.

Get started

The geomorphometry community is invited to explore Whitebox Next Gen, test its tools and workflows, report issues, and contribute to the continued development of the project.

DEMIX reveals which DEMs perform best

First round of the DEMIX exercise published final report

Global digital elevation models (DEMs) have become routine operational inputs across mapping, environmental monitoring, modelling and Earth-observation workflows. Their broad coverage and global availability have made them data that many practitioners simply take for granted. But knowledge of the terrain and topography of Earth’s surface is fundamental for monitoring and understanding terrestrial ecosystems and the planet’s habitability. For that reason, the CEOS Working Group on Calibration and Validation (WGCV) maintains a subgroup dedicated to digital topography and the quality of DEMs, the ‘Terrain Mapping Sub-Group (TMSG).

DEMs are representations of elevation in the form of a georectified grid, at global scale commonly derived from space-based interferometric synthetic aperture radar (InSAR) or stereoscopic optical observations, while regionally and locally airborne Laser induced detection and ranging (LIDAR) has become the primary source. DEMs can be classified as digital surface models (DSMs) when depicting the lower surface of the atmosphere or digital terrain models (DTMs) when depicting the top of the lithosphere (the Earth’s crust).

A wide variety of DEM products exist – each having different characteristics which suit different applications. It can be challenging to understand which of the available DEM products are fit for purpose for certain applications or regions. That is the practical gap addressed by the Digital Elevation Model Intercomparison Exercise (DEMIX) undertaken by TMSG. By exposing where widely used global DEMs agree, where they differ and how those differences affect rankings, the exercise delivered evidence to users for selecting a DEM rather than defaulting to one by habit.

DEM products were compared through a ‘wine contest,’ which identified requirements of openness, reproducibility, adaptability, and statistical rigour. The characteristics, evaluations, and ranking for each DEM were collected in a GIS database with over 50,000 entries. A quantitative assessment was carried out for each global DEM based on pixel-by-pixel differences of geomorphometric parameters against finer spatial resolution (1-5 m resolution) reference DEMs.

The study incorporates an unprecedented amount of high quality reference data covering a broad range of landforms and surface types, comparing their characteristics without resampling or interpolation. Users are invited to consult the results of DEMIX in order to make informed choices when needing to use a DEM, or in some cases a combination of the most relevant DEMs for their applications.

The final rankings of the wine contest, presented below, compared the six DEMs based on land cover (forest, urban, or barren), slope (cliff, steep, gentle, or flat), differences in elevation, slope and roughness, and statistical metrics.

Led by the European Commission’s Joint Research Centre (JRC), the CEOS Working Group on Calibration and Validation (WGCV) Terrain Mapping Subgroup (TMSG) established DEMIX in partnership with the International Society for Geomorphometry. Several members of the International Society of the Geomorphometry contributed significantly and we hosted various secssions at our latest conference. The exercise was performed over a three-year period starting in 2020, with community-wide calls for participation and an assembly of experts producing a number of peer-reviewed publications, culminating with a JRC reference report published in July 2026.

The objective of DEMIX was to propose a procedure to rank the available free and open global DEMs, taking into consideration user needs while promoting the implementation of FAIR (Findable, Accessible, Interoperable and Reusable) principles. The exercise compared DEMs based on criteria for land cover and terrain slope categories, representative testing, and a statistically sound ranking approach. The report outputs tailored recommendations regarding available DEM products that are not limited to one domain, geographic area, or landscape type, with flexibility for different user needs and applications.

A major challenge in the comparison of the global DEMs were the varying formats, data, and metadata contents. The adoption of a common set of standards would enhance the quality and interoperability of global DEMs and streamline the exchange and utilisation of DEM data for both providers and users. DEMIX makes the following recommendations for data providers:

● Adopt a standardised grid layout, with complete grid definitions and encodings following ISO/OGC rules.

● Include vertical datum information as part of raster DEM files.

● Clearly indicate the product version in the file names.

● Participate in future DEMIX rounds, which serve as a neutral platform for independently evaluating products before their release.

● Provide high quality, finer resolution, accurate, and multi-temporal elevation data to be used as a reference alongside DEM products.

Global DEMs are indispensable operational geospatial datasets, but they should not be treated as error-free or interchangeable. DEMIX delivered to the global community a systematic and transparent method to help choose elevation products more intelligently and help define what better elevation measurements should look like in the future.

Further Reading:

Read more in the DEMIX Final Report, or see other DEMIX publications below - mainly by our ISG members:

  • Benchmarking Elevation Plus Land Surface Parameters Finds FathomDEM and Copernicus DEM Win as Best Global DEMs (2025) and subsequent discussion (2026a, 2026b)
  • Ranking of 10 Global One-Arc-Second DEMs Reveals Limitations in Terrain Morphology Representation 2025
  • Novel Approach for Ranking DEMs: Copernicus DEM Improves One Arc Second Open Global Topography (2024)
  • Digital Elevation Models: Terminology and Definitions (2021)
  • The Digital Elevation Model Intercomparison eXperiment DEMIX, a community-based approach at global DEM benchmarking (2021)

Coffee Talk - GeoNadir

Building the world’s largest repository of FAIR drone mapping data

Paul Mead GeoNadir

September 2nd, 2026
11:30 (UTC)

Bio: Paul Mead is Co-founder and Head of Business & Strategy at GeoNadir, a platform building the world’s largest repository of FAIR drone mapping data to support environmental decision-making. A non-technical co-founder, Paul focuses on strategy, commercial development, and building high-performing teams — a discipline shaped by 11 years in the New Zealand Army, including leading a bomb disposal team in Lebanon and service in Afghanistan and the Asia-Pacific region. Since 2013 he has built and led several small businesses and start-ups, with drones as a central technology since 2016. Alongside GeoNadir, Paul co-founded She Maps, an internationally recognised drone and geospatial STEM education organisation, and has helped raise over $7M in equity and non-equity funding across his ventures. He holds a Master of Philosophy from the University of Queensland and is a Chartered Manager.

Abstract: GeoNadir set out to build the world’s largest repository of FAIR drone mapping data, and ended up building something more powerful. Drones have democratised data capture, but the same democratised ability to generate decision-grade insights from the data is lacking. I’ll walk through how we’re closing that gap: the data infrastructure behind hosting large volumes of UAV imagery and derived products, and how we’re moving from manual analysis toward automated, repeatable geospatial analytics.