Alen Berta

Alen Berta
CGI · Space

PhD in Forestry (Remote Sensing and Forest Management)

About

35
Publications
11,231
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46
Citations
Introduction
With more than 12 years of experience in environmental consulting, I have a wide range of experience in various themes related to remote sensing, forestry, agriculture, biomass, ecology, carbon sequestration, land use/land cover and habitat mapping on national and local level. All of these projects where accomplished with extensive use of GIS, remote sensing and statistical modelling (machine learning, data mining, regression analysis, DSS, etc) in many different forms.

Publications

Publications (35)
Conference Paper
Full-text available
High resolution spatial information on forest tree species composition can provide valuable information that can help during forest management or monitoring. This is especially the case in European continental vegetation area where biodiversity is high, creating many different forest types with wide range of composition ratio in small areas. As of...
Presentation
Full-text available
Advantages of remote sensing (RS) for obtaining information from inaccessible areas or just as a mean that enables decreasement in the extent of the expensive field research, are well known. By technology evolution, sensors used for RS are constantly improved in terms of precision, variety and availability. Nowadays, ESA (European Space Agency) has...
Article
Full-text available
Background and Purpose: Unmanned aerial vehicles (UAVs) are flexible to solve various surveying tasks which make them useful in many disciplines, including forestry. The main goal of this research is to evaluate the quality of photogrammetry-based digital surface model (DSM) from low-cost UAV’s images collected in non-optimal weather (windy and clo...
Article
Full-text available
This paper shows a procedure of processing Light Detection and Ranging (LiDAR) data collected by airborne laser scanning (ALS) for the urban vegetation area of Zagreb (Nikola Šubić Zrinski Square). Furthermore, the comparison between tree heights obtained from LiDAR data and field survey was conducted. For each tree in the research area, tree speci...
Conference Paper
Full-text available
Private owned forests in Croatia covers approximately one third of the afforested land (cca. 720.000 ha of 2.5 million hectares). These forests were not actively managed in the past although they had to adhere to certain laws and regulations through history, but owners had a possibility to decide what and when to do with their ownership. This resul...
Poster
Full-text available
European continental forests are areas with very high biodiversity creating many different forest types with wide range of composition ratio in small areas. This could impose problem when precise mapping is needed. Sometimes, it could be hard to delineate different forest types even with the field research due to species mixture range. In this res...
Presentation
Full-text available
Within the Laboratory for Remote Sensing and GIS (LADIGIS) and Laboratory for Fish and Aquatic Ecosystems the research of the possibility of using satellite imagery in the monitoring of eutrophication in water bodies – lakes, has been tested. For this research, we used Sentinel 2 satellite imagery data provided by the European Space Agency (ESA) a...
Presentation
Full-text available
LIDAR systems are giving us an enormous amount of data with unprecedented quality and precision in a form of point cloud. Its main characteristic is that it can penetrate even dense vegetation giving us a view under the trees which was impossible with previous remote sensing sensors. Although this technology is still rather expensive, LIDAR systems...
Presentation
Full-text available
From the year 2000, as a part of the research in the Environmental Impact Assessment of the planned Danube-Sava Multipurpose Channel, complex forestry-ecological surveys were undertaken in the area of the Spačva forest basin. Initially, conventional methods of forest ecosystem monitoring were used. Those methods included the use of manual dendromet...
Presentation
Full-text available
The LPIS (Land Parcel Identification System) quality can be roughly defined as the ability of the system to have two necessities. First, the system needs to provide an unambiguous and direct reference for the localization of all declared agricultural parcels by involved parties (farmers and other users with direct interest) and the control measurem...
Poster
U sklopu izrade Programa gospodarenja za Gospodarsku jedinicu Park šuma Marjan (2019. –2029.) sakupljeno je 16 fitocenoloških snimki na području sedam gospodarskih odsjeka Gospodarske jedinice Park šuma Marjan. Fitocenološke snimke sakupljene su sukladno BraunBlanquet metodi. Površine snimki bile su 400 m 2 . U većini snimaka u sloju drveća prevlad...
Conference Paper
Full-text available
Various remote sensing techniques have been actively applied in Croatia within forestry, land and topographic surveying over the past decades. Such an approach has never been applied in the agricultural field of study. With our approach, we wanted to apply Remote Sensing data and machine learning techniques to test its feasibility for our project n...
Article
Full-text available
Background and Purpose: Although organized forestry has existed in Croatia for more than 250 years, this mostly entailed state forests. During the last decade, Extension Services have started to support the development of forest management plans for privately owned forests. Lately, FMPs have been developed for nearly 3/4 of privately owned forests...
Conference Paper
Full-text available
Oak lace bug Corythucha arcuata (Heteroptera: Tingidae), is an alien invasive insect in Europe that originates from North America. It produces three to four generations per year. As it has no natural enemies in Europe and insecticides are mostly ineffective, it spreads quickly. It was recorded for the first time near the eastern Croatian border in...
Conference Paper
Remote sensing technology offers a pragmatic and efficient way of forest monitoring and inventorying. Remote sensing analysis have been applied in forestry for last several decades, but there is no single standard procedure used for biomass assessment. Also, there is no quorum whether is it more appropriate to create models with data averaged on se...
Poster
Full-text available
This study aims to test the influence of different DTMs (ALS and PHM), in the combination with UAV DSM, on the quality of CHM (normalized point clouds) and tree height estimates at the plot-level.
Conference Paper
Full-text available
Mapping of burnt forest areas is essential step towards damage assessment and mitigation activities planning. Field mapping can be time-consuming, especially in remote and inaccessible areas. Recognizing and classification of burned areas via remote sensing can be a useful method which generates quick and near real-time results and saves resources....
Conference Paper
As part of the mandatory reports Croatia has committed to (regarding National Inventory Report (NIR), Agriculture, Forestry and Other Land Use (AFOLU) and Land use, Land Use Change and Forestry (LULUCF)), biomass data of the continental first age class forests and (sub-) Mediterranean thickets and maquis is required. Since biomass estimations of th...
Conference Paper
More than a half of Croatian Mediterranean and sub-Mediterranean ie. circa 800,000 ha are covered with forest vegetation. Further, more than 95 % of it are consisting of Holm oak (Quercus ilex L.) or Pubescent oak (Quercus pubescens Willd.) forests in mainly degraded forms (coppice or shrubs/maquis). Regarding ownership, half of those forests are p...
Article
Full-text available
Digital terrain models (DTMs) present important data source for different applications in environmental disciplines including forestry. At regional level, DTMs are commonly created using airborne digital photogrammetry or airborne laser scanning (ALS) technology. This study aims to evaluate the vertical accuracy of DTMs of different spatial resolut...
Preprint
Full-text available
Digital terrain models (DTMs) present important data source for different applications in environmental disciplines including forestry. At regional level, DTMs are commonly created using airborne digital photogrammetry or airborne laser scanning (ALS) technology. This study aims to evaluate the vertical accuracy of DTMs of different spatial resolut...
Presentation
Full-text available
As part of the project Upgrade and development of the environmental protection information system and improvement of the monitoring and reporting system on the environment in the Republic of Croatia was planned to assess the wood stock in maquis and scrublands. Major goal was to fill the knowledge gap about present woodstock in these stands since t...
Poster
Full-text available
Croatia has long experience in CLC mapping. There were three CLC projects for Croatia. In 2000, the first mapping according to CORINE methodology was performed. In the same project, changes dating back to 1990 and 1980 were also performed and CLC 1980 and CLC 1990 were produced. In 2006, the second project included mapping of changes 2000 – 2006, u...
Article
Privatne šume prema Šumskogospodarskoj osnovi RH 2006-2015 zauzimaju 22 % ukupne površine šuma i šumskog zemljišta u RH tj. oko 600.000 ha. Neke od značajki privatnih šuma su: da se radi o sitnim česticama i posjedima, na istoj površini nalazi se veći broj posjednika te iznimna nesređenost podataka u katastru. U ovom radu obrađeni su podaci o česti...
Article
Full-text available
Private owned forests occupy 22 % of the total forest and forest land area i.e. approximately 600,000 ha, according to Forest Management Plan for the area of the Republic of Croatia. Some of the private owned forest characteristics are as follows: small cadastral plots and estates, large number of landlords for the same area and great discrepancy o...
Conference Paper
Full-text available
If we strive towards sustainable management, forest management is a challenge because it requires expertise, timeliness and moderation. This also means that this type of management needs to be in line with the forest stand capability. In order to achieve influence and impact, these terms have to be implemented on the stand level, not the cadastral...
Presentation
Full-text available
Prezentacija održana u sklopu 5. Hrvatskog botaničkog simpozija s međunarodnim sudjelovanjem / Presentation held on the 5th Croatian Botanical Symposium with international participation
Presentation
Full-text available
Key words: motorway, risk asessment, landslides, GIS Preklapanjem različitih prostornih podataka upotrebom GIS tehnologije procjenjene su potencijalno najugroženije zone odnosno mjesta na kojima se mogu pojaviti klizišta. Za procjenu rizika od pojave klizišta kao prirodni čimbenici koji utječu na pojavu klizišta u obzir su uzeti nagib terena, geol...
Presentation
Full-text available
Projects regarding nature and environment protection usually require evaluation of the area’s importance for biodiversity conservation. When the actual data about the area’s biodiversity are insufficient, evaluation is often based on the evaluation of present habitats. There are numerous methods for habitat evaluation based on detailed information...
Conference Paper
Full-text available
Due to the complex role of areas under vegetation in landscape and landscape perception, it was necessary to develop a methodology for the evaluation of such areas during the landscape study for Veli Brijun island, a part of the Brijuni National park. NP Brijuni is situated in the Istrian County, Croatia and has extraordinary natural, cultural, his...
Conference Paper
Full-text available
The greenhouse effect is undoubtedly one of the most difficult modern day environmental problems, and the biggest culprit for it, in terms of emitted quantities, is CO2 – carbon dioxide. Its current concentration is higher than ever in the history of Earth. Forests, as one of the carbon sinks (along with seas and soil) may play a decisive role in m...
Conference Paper
Full-text available
Observing forest management through history, it is quite obvious that purpose of wood as the main forest product has transformed together with the evolution of society. At first, wood was used for personal needs, then as building material, and with the arrival of the Industrial Revolution it became a source of energy. Development of science led to...
Conference Paper
Wind powerplants, as renewable energy sources, can be observed as carbon sinks if anticipated energy production is put in relation with CO2 emission of fossil-fuel power plant for producing same amount of energy. On the other hand, forest ecosystem trough photosynthesis is binding atmospheric CO2 in wood mass. Thus, question relating carbon balance...

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Projects

Projects (9)
Project
Within this project we plan to use available satellite imagery (Sentinel 1 and Sentinel 2) data provided by European Space Agency (ESA) to automatically map predefined agricultural land cover classes for the area of the Republic of Croatia. The main aim is to use Random Forest (RF) classifier to classify different agricultural crops, explore best vegetation periods for each crop to get seasonal pattern and to find most suitable vegetation indices for crop mapping.
Project
With this research, we will first determine woodstock/standing biomass with field research and high density LIDAR point cloud. Also, we will map the dieback of the trees in last few years with a help of SENTINEL2 imagery and establish the „near-real time“ monitoring/early warning system on almost a tree level.
Project
Comprehensive research of forest health, growth, yield and forest hydrological processes on 10 permanent field plot established more than 10 year ago. Area is Spačva basin, the largest and the most valuable forest complex of pedunculate oak (Quercus robur) in Europe (app. 70.000 ha). Until now, dendrochronology research is done and constant monitoring of tree growth with manual dendrometers. Also, underground water depth and soil moisture is measured regularly. This year we expanded the research with remote sensing (MODIS and LANDSAT8) for forest health and production monitoring, analysing also historical data. We also installed small meteo stations of 4 plots with automatic soil temperature and moisture monitoring and sap flow measurement systems (EMS BRNO) on 20 trees with automatic dendrometers. With this we will have all data to cover whole hydrological circle in these forests. Next year we will do a research on soils (and its physiological-chemical characteristics) and hydrological modelling with historical data.