Results 71 to 80 of about 977,590 (212)

Countywide Vertical Datum Conversion Factors in Illinois [PDF]

, 2007
"Countywide Vertical Datum Conversion Factors in Illinois - This map displays countywide, conversion values to adjust elevations from the National Geodetic Vertical Datum 1929 (NGVD 29) to the North American Vertical Datum 1988 (NAVD 88).
Illinois State Water Survey
core  

The united geodetic vertical network of Latvia and Lithuania

Geodesy and Cartography, 2012
A unified and continuous national vertical network is the back-bone for geodesy, cartography, civil engineering and global positioning. International institutions are working to reach homogenous and unified vertical datum all around the globe.
Ivars Aleksejenko, Janis Sakne, Maris Kalinka, Martins Reiniks, Ausra Kalantaite, Boleslovas Krikstaponis, Eimuntas Kazimieras Parseliunas, Petras Petroskevicius, Povilas Viskontas   +8 more
doaj   +1 more source

Utilizing Airborne LiDAR and UAV Photogrammetry Techniques in Local Geoid Model Determination and Validation

ISPRS International Journal of Geo-Information, 2020
This investigation evaluates the performance of digital terrain models (DTMs) generated in different vertical datums by aerial LiDAR and unmanned aerial vehicle (UAV) photogrammetry techniques, for the determination and validation of local geoid models ...
Serdar Erol, Emrah Özögel, Ramazan Alper Kuçak, Bihter Erol   +3 more
doaj   +1 more source

Morphometric Relationships, Condition Indices and Size‐Dependent Morphometric Shifts in Four Lobster Species From Southeastern Brazil

Aquaculture, Fish and Fisheries, Volume 6, Issue 5, October 2026.
ABSTRACT Reliable morphometric relationships are essential for integrating fisheries datasets collected under different sampling protocols, yet regional information remains scarce for several commercially exploited Brazilian lobsters. We quantified species‐ and sex‐specific morphometric relationships for four commercially important lobster species ...
Rodrigo Barreto, Andressa Carolina Mendes de Melo, Rayana Brandão Santos, Lucas Galdino Caseiro, Mariana Herpet Salvador, Nadia Ortolan da Vitória, Jones Santander‐Neto   +6 more
wiley   +1 more source

A Methodological Case Study for Integrating Virtual Reality and 3D Photogrammetry: A Pilot Digital Platform for Exploring Mangrove Environments

Ecology and Evolution, Volume 16, Issue 10, October 2026.
This study presents a methodological prototype that demonstrates the potential of integrating virtual reality and 3D photogrammetry to address the logistical and safety challenges inherent in exploration within sensitive habitats, with particular focus on mangrove ecosystems.
Terence Pun Tung Ng, Kenny Zhi Hao Li, Cheryl Wood Yee Shum, Kian Ka Ki Tam, Yiu Man Chan, Flora Siu Yan Mok, David Tai Wai Lau   +6 more
wiley   +1 more source

Intercontinental height datum connection with GOCE and GPS-levelling data

Journal of Geodetic Science, 2012
In this study an attempt is made to establish height system datum connections based upon a gravity field and steady-state ocean circulation explorer (GOCE) gravity field model and a set of global positioning system (GPS) and levelling data. The procedure
Gruber T., Gerlach C., Haagmans R.
doaj   +1 more source

Análisis de la evolución temporal del datum vertical brasileño de Imbituba

Revista Cartográfica, 2019
Actualmente, los temas más centrales de Geodesia se vinculan a la provisión de un Sistema de Referencia Global único, al que puedan vincularse de forma unívoca y con exactitud los cambios globales de carácter geométrico y físico.
Luciana Maria Da Silva, Sílvio Rogério Correia de Freitas   +1 more
doaj   +1 more source

A quality investigation of global vertical datum connection [PDF]

Geophysical Journal International, 1992
SUMMARY Vertical datum connection is investigated from the viewpoint of quality, i.e. accuracy and reliability, based on the method originally proposed by Rummel & Teunissen (1988). Three simulations are carried out. The levelling accuracy is assumed to be 1 mmkm-1 and the position accuracy of space stations 5 cm. The three error models of the geoid
openaire   +1 more source

The Canadian Geodetic Vertical Datum of 2013 (CGVD2013)

Geomatica, 2016
The Canadian Geodetic Vertical Datum of 2013 (CGVD2013) is the first major update to the vertical datum in Canada in almost 100 years. Canada is not only moving to a new vertical datum, but it is also using a modernized approach to realize it. The modernization of the height reference system is necessary to make it compatible with Global Navigation ...
Marc Véronneau, Jianliang Huang
openaire   +1 more source

Seasonality, Storms and Soil Properties Drive Groundwater and Salinity Dynamics in Retreating Coastal Forests

Ecohydrology, Volume 19, Issue 7, October/November 2026.
ABSTRACT Sea level rise is causing the rapid conversion of upland habitats to salt marshes in low‐sloping areas due to increasing groundwater salinity and soil saturation. Despite this being a widespread phenomenon, questions remain about the factors shaping groundwater hydrology and salinity in these transitioning systems, particularly in the US ...
Andrew R. Payne, Franco Montalto, Elizabeth Watson   +2 more
wiley   +1 more source