Martin Mokros

Martin Mokros
Czech University of Life Sciences Prague | CULS · Faculty of Forestry and Wood Sciences

PhD
Chair of the 3DForEcoTech COST Action

About

54
Publications
28,394
Reads
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835
Citations
Introduction
My current focus is on terrestrial laser scanning, terrestrial and UAV photogrammetry. We are working on data collection and data processing of point clouds where the main object is tree within a forest. The most important product from our group is DendroCloud software (available here: http://gis.tuzvo.sk/dendrocloud/). Furthemore, I am focusing on script developing in R for climate change prediction within whole Europe (https://www.researchgate.net/lab/Global-Change-Research-Group-Tomas-Hlasny).
Additional affiliations
February 2018 - present
April 2015 - June 2015
Finnish Geodetic Institute
Position
  • Visiting PhD student
February 2015 - present
Technical University in Zvolen
Position
  • Researcher
Education
September 2012 - September 2015
Technical University in Zvolen
Field of study
  • Forest management
September 2010 - August 2012
Technical University in Zvolen
Field of study
  • Geoinformation and mapping techniques in forestry

Publications

Publications (54)
Conference Paper
Full-text available
Unmanned Aerial Vehicles (UAVs) are used as stand-alone systems for a variety of purposes from agriculture, and environmental monitoring through architecture, and construction to humanitarian missions. The advantage of UAV is high spatial and temporal resolution but on the other hand, the disadvantage is the small area of cover and time demanding d...
Article
Full-text available
The positional accuracy derived from the outputs of carried integrated devices was evaluated in this study. For data collection, the inertial navigation system (INS) SPAN NovAtel and a handheld mobile laser scanner GeoSLAM ZEB Horizon which uses simultaneous localization and mapping technology (SLAM) were utilized for data collection. The accuracy...
Article
Full-text available
Remote sensing of forest landscape is sometimes quite challenging, considering the rugged terrain, remote areas and presence of dense canopy. LiDAR is capable of generating dense three-dimensional (3D) structure of the forest. But when research is focused on a small area that needs dense information Terrestrial Laser Scanner (TLS) proves to be an e...
Article
Full-text available
Deadwood is an important component of forests that fulfils many ecosystem functions. The occurrence, amount and spatial distribution of deadwood in forest ecosystems depend on tree species composition, historical development and past management. In this presented study, we assessed the total amount of deadwood, including fine and coarse woody debri...
Article
Full-text available
The development of devices capable of generating three-dimensional (3D) point clouds of the forest is flourishing in recent years. It is possible to generate relatively dense and accurate 3D data not only by terrestrial laser scanning but also mobile laser scanning, personal laser scanning (hand-held or in a backpack), photogrammetry, or even using...
Article
Full-text available
Remote Sensing (RS) techniques are increasingly used in urban tree inventory measurements for their improved accuracy and promptness over the conventional methods. The focus of this study is to evaluate the application of iPad Pro 2020 and its LiDAR sensor for urban trees reconstruction and Diameter at Breast Height (DBH) measurements. Altogether,...
Article
Full-text available
Ecosystem complexity is among the important drivers of biodiversity and ecosystem functioning, and unmanned aerial systems (UASs) are becoming an important tool for characterizing vegetation patterns and processes. The variety of UASs applications is immense, and so are the procedures to process UASs data described in the literature. Optimizing the...
Article
Full-text available
Climate change is a major threat to global biodiversity, although projected changes show remarkable geographical and temporal variability. Understanding this variability allows for the identification of regions where the present-day conservation objectives may be at risk or where opportunities for biodiversity conservation emerge. We use a multi-mo...
Article
Full-text available
SfM can produce image-based point clouds with high accuracy and quality only by consumer cameras. In this paper, we evaluated the urban trees reconstruction and Diameter at Breast Height(DBH) measurements by SfM based on a circular urban forest plot(radius = 6 m) to verify the feasibility for urban forest inventory. Furthermore, hand-held laser sca...
Preprint
Full-text available
Climate change is a major threat to global biodiversity, although projected changes show remarkable geographical and temporal variability. Understanding this variability allows for the identification of regions where the present-day conservation objectives may be at risk or where opportunities for biodiversity conservation emerge. We use a multi-mo...
Article
Full-text available
Circle-fitting methods are commonly used to estimate diameter at breast height (DBH) of trees from horizontal cross-section of point clouds. In this paper, we addressed the problem of cross-section thickness optimization regarding DBH estimation bias and accuracy. DBH of 121 European beeches (Fagus sylvatica L.) and 43 Sessile oaks (Quercus petraea...
Article
Full-text available
Nowadays it is important to shift positional accuracy of object measurements under the forest canopy closer to the accuracy standards for land surveys due to the requirements in the field of ecosystem protection, sustainable forest management, property relations, and land register. Simultaneously, it is desirable to use the technology of environmen...
Article
Full-text available
Annual trunk increments are essential for short-term analyses of the response of trees to various factors. For instance, based on annual trunk increments, it is possible to develop and calibrate forest growth models. We investigated the possibility of estimating annual trunk increments from the terrestrial structure from motion (SfM) photogrammetry...
Article
Full-text available
Strong winds may uproot and break trees and represent a major natural disturbance for European forests. Wind disturbances have intensified over the last decades globally and are expected to further rise in view of the effects of climate change. Despite the importance of such natural disturbances, there are currently no spatially explicit databases...
Article
Strong winds may uproot and break trees and represent a major natural disturbance for European forests. Wind disturbances have intensified over the last decades globally and are expected to further rise in view of the effects of climate change. Despite the importance of such natural disturbances, there are currently no spatially explicit databases...
Article
Full-text available
Strong winds may uproot and break trees and represent one of the major natural disturbances for European forests. Wind disturbances have intensified over the last decades globally and are expected to further rise in view of the climate change effects. Despite the importance of such natural disturbances, there are currently no spatially-explicit dat...
Preprint
Full-text available
Strong winds may uproot and break trees and represent one of the major natural disturbances for European forests. Wind disturbances have intensified over the last decades globally and are expected to further rise in view of the climate change effects. Despite the importance of such natural disturbances, there are currently no spatially-explicit dat...
Article
Full-text available
The forest inventory is an important instrument for sustainable forest management. Canopy Height Model (CHM) and Digital Surface Model (DSM) created from high-resolution UAV (unmanned aerial vehicle) imagery provide possibility to determine tree crown diameters for the whole stand at fast. The goal of this paper is to identify the influence of tree...
Article
Full-text available
The measurements of tree attributes required for forest monitoring and management planning, e.g., National Forest Inventories, are derived by rather time-consuming field measurements on sample plots, using calipers and measurement tapes. Therefore, forest managers and researchers are looking for alternative methods. Currently, terrestrial laser sca...
Poster
Full-text available
Is fixed-wing unmanned aerial vehicle with RTK/PPK great deal for forestry? Yes, it is.
Article
Full-text available
Mapping hard-to-access and hazardous parts of forests by terrestrial surveying methods is a challenging task. Remote sensing techniques can provide an alternative solution to such cases. Unmanned aerial vehicles (UAVs) can provide on-demand data and higher flexibility in comparison to other remote sensing techniques. However, traditional georeferen...
Article
Full-text available
Mobile laser scanning (MLS) is a progressive technology that has already demonstrated its ability to provide highly accurate measurements of road networks. Mobile innovation of the laser scanning has also found its use in forest mapping over the last decade. In most cases, existing methods for forest data acquisition using MLS result in misaligned...
Article
Full-text available
An active gully-related landslide system is located in a deep valley under forest canopy cover. Generally, point clouds from forested areas have a lack of data connectivity, and optical parameters of scanning cameras lead to different densities of point clouds. Data noise or systematic errors (missing data) make the automatic identification of land...
Article
Full-text available
Close-range photogrammetry (CRP) can be used to provide precise and detailed three-dimensional data of objects. For several years, CRP has been a subject of research in forestry. Several studies have focused on tree reconstruction at the forest stand, plot, and tree levels. In our study, we focused on the reconstruction of trees separately within t...
Article
Full-text available
The last two decades have witnessed increasing awareness of the potential of terrestrial laser scanning (TLS) in forest applications in both public and commercial sectors, along with tremendous research efforts and progress. It is time to inspect the achievements of and the remaining barriers to TLS-based forest investigations, so further research...
Conference Paper
Full-text available
The close-range photogrammetry (CRP) is a robust tool for point clouds generation. We can see a huge usage spread of the CRP in all different sectors. In our research, we are focusing on the use of CRP for forestry. Especially , for forest inventory with focus on trunk diameter. The main advantage of CRP is lower hardware costs with a comparison to...
Conference Paper
Full-text available
A wide demand on 3d data useful for environmental documentation has inducted the need of evaluation of various techniques applicable. In forestry, the 3d data are used mainly for determination of forest inventory parameters (e.g. heights and diameters of trees.. .). Many studies have been conducted recently, aimed especially on LIDAR and photogramm...
Article
Full-text available
The potential of close-range photogrammetry (CRP) to compete with terrestrial laser scanning (TLS) to produce dense and accurate point clouds has increased in recent years. The use of CRP for estimating tree diameter at breast height (DBH) has multiple advantages over TLS. For example, point clouds from CRP are similar to TLS, but hardware costs ar...
Article
Full-text available
This study compares the accuracies of diameter at breast height (DBH) estimations by three initial (minimum bounding box, centroid, and maximum distance) and two refining (Monte Carlo and optimal circle) circle-fitting methods The circle-fitting algorithms were evaluated in multi-scan mode and a simulated single-scan mode on 157 European beech tree...
Conference Paper
Full-text available
Close-range photogrammetry (CRP) represents very perspective technology for many fields. It can provide results comparable to terrestrial laser scanning, and the hardware is still much cheaper. Our research group is developing low-cost CRP device based on Raspberry Pi 3 computer. Raspberry Pi 3 is a single-board computer with relatively high comput...
Article
Full-text available
Mobile laser scanning (MLS) is time-efficient technology of geospatial data collection that proved its ability to provide accurate measurements in many fields. Mobile innovation of the terrestrial laser scanning has a potential to collect forest inventory data on a tree level from large plots in a short time. Valuable data, collected using mobile m...
Article
Full-text available
Strong wind disturbances can affect large forested areas and often occur irregularly within a forest. Due to this, identifying damaged sites and estimating the extent of these losses are crucial for the harvesting management of salvage logging. Furthermore, the location should be surveyed as soon as possible after the disturbance to prevent the deg...
Article
Full-text available
This study focuses on the horizontal and vertical accuracy of point-clouds based on unmanned aerial vehicle (UAV) imagery. The DJI Phantom 3 Professional unmanned aerial vehicle and Agisoft PhotoScan Professional software were used for the evaluation. Three test sites with differing conditions (canopy openness, slope, terrain complexity, etc.) were...
Conference Paper
Full-text available
In recent years unmanned aircraft systems (UAS) are objects of research in many areas. This trend can be seen also in forest research where researchers are focusing on height, diameter and tree crown measurements, monitoring of forest fire, forest gaps and health condition. Our research is focusing on the use of UAS for detecting areas disturbed by...
Poster
Full-text available
The rapid development of unmanned aerial vehicles is a challenge for applied research. Many technologies are developed and then researcher are looking up for their application in different sectors. Therefore, we decided to verify the use of the unmanned aerial vehicle for wood chips pile monitoring. We compared the use of GNSS device and unmanned a...
Conference Paper
Full-text available
Terrestrial photogrammetry nowadays offers a reasonably cheap, intuitive and effective approach to 3D-modelling. However, the important choice, which sensor and which software to use is not straight forward and needs consideration as the choice will have effects on the resulting 3D point cloud and its derivatives. We compare five different sensors...
Article
Full-text available
Terrestrial photogrammetry nowadays offers a reasonably cheap, intuitive and effective approach to 3D-modelling. However, the important choice, which sensor and which software to use is not straight forward and needs consideration as the choice will have effects on the resulting 3D point cloud and its derivatives. We compare five different sensor...
Conference Paper
Full-text available
The rapid development of unmanned aerial vehicles is a challenge for applied research. Many technologies are developed and then researcher are looking up for their application in different sectors. Therefore, we decided to verify the use of the unmanned aerial vehicle for wood chips pile monitoring. We compared the use of GNSS device and unmanned...
Article
Full-text available
The rapid development of unmanned aerial vehicles is a challenge for applied research. Many technologies are developed and then researcher are looking up for their application in different sectors. Therefore, we decided to verify the use of the unmanned aerial vehicle for wood chips pile monitoring. We compared the use of GNSS device and unmanned...

Questions

Questions (6)
Question
Within the 3DForEcoTech COST Action, we want to create a workflow database of all solutions for processing detailed point clouds of forest ecosystems. Currently, we are collecting all solutions out there.
So if you are a developer, tester or user do not hesitate to submit the solution/algorithm here: https://forms.gle/xmeKtW3fJJMaa7DXA
You can follow the project here: https://twitter.com/3DForEcoTech
Question
I am looking for hyperspectral images from UAV that captured forest or forest plantation. Do you know about some source where I can download some examples?
Thank you
Martin
Question
I came accross some studies and the settings of camera differ and also the opinion on it. So when I set the camera in manual mode. I will set shutter speed, ISO, F-number in combination where I will avoid blurry images but still I will get enough light. But do you think if I will use auto-focus setting it can lead to failing the aligning process? In the case of terrestrial photogrammetry the focus can differ greatly but also in some case of UAV photogrammetry. And what if I use auto ISO or shutterspeed. What is your opinion?
Question
Hi RG comunity,
I have got this mail yesterday about "citing for money". Is this real? Is this legal? Is it possible to do something with this? What do you think?
My name is Zhang, I am from China. I am a businessman, my business is about Citing for Money.
Please let me introduce the nature of this business:
As you know, the IF(Impact Factor)of a journal is very important, if a journal has a high Impact Factor, the journal will be very significant and famous. So many journals published in English ask my company to improve their Impact Factors. And the only way to improve the Impact Factors is to cite papers from the journals.
So now I invite you to cooperate into this business, the cooperation method is as follows:
1.The price is : 50 USD for each citation, that is, if you cite 1 paper in one of your papers, you will get 50USD, and if you cite 8 papers in one of your papers, you will get 400 USD...
Question
Dear all,
I am searching for some excellent book for scientific writing that is focusing on English. Especially on grammar with the parts of manuscripts (abstract, introduction and so on). I have used google of course, but I would like to get some suggestions from experience researchers (:
Thank you
Question
I have a circle polygons spread randomly within the area. I want to test the occlusion/vissibility. Is there some easy way to do it? Best in R or some GIS software. Also to use multiple points. But there want be any digital elevation model or so. I just want to identify which polygons I see and which don't. Just simple in 2D.
Thank you

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Projects

Projects (10)
Project
The aim of the project is to evaluate different approaches to laser scanning and photogrammetry in different forest conditions. Considered technologies: terrestrial laser scanning. handheld laser scanning, mobile photogrammetry, smartphone laser scanning.
Project
3DForEcoTech project aims to establish a strong network of scientists and stakeholders (i.e. practitioners) and sensor manufacturers to synchronise the knowledge, to develop general protocols and algorithms for forest ecosystem state survey and forest functioning, and to make close-range novel technologies available to a broad audience. Specifically, 3DForEcoTech will develop protocols for data acquisition, processing, fusion for forest inventory and ecological applications, and will establish open-data and open-source algorithm databases.
Project
This study program addresses an increasing recognition of the importance of modern technologies for acquisition and analyses of spatial data (including data on forest ecosystems), increasing demands on processing of such data and their use in practical forest management and research. The program strives to prepare experts who are able to use extensive data and knowledge bases to heighten the quality of forestry decision-making and improve, for example, our capacities for crises management related to forest disturbances or forest adaptation to environmental changes. The program emphasises remote sensing-based approaches, including novel tools based on laser scanning and drone operation, spatial optimization of forest landscapes or use of complex ecosystem models. Students are provided with the most-recent technical equipment and diverse software products, and have good opportunities to work in international teams as well as collaborate with forestry practice. For more details visit: https://www.fld.czu.cz/en/r-9414-study/r-9500-study-now/r-10418-phd-degree-programmes/r-14315-applied-geoinformatics-and-remote-sensing-in-forestry