Projects / Programmes
HARMONIZACIJA DOLOčITVE PREDMETOV NA OPTIčNIH SATELITSKIH POSNETKIH (Slovene)
| Code |
Science |
Field |
Subfield |
| 2.17.00 |
Engineering sciences and technologies |
Geodesy |
|
Researchers (1)
| no. |
Code |
Name and surname |
Research area |
Role |
Period |
No. of publicationsNo. of publications |
| 1. |
20005 |
PhD Tatjana Veljanovski |
Geodesy |
Head |
2009 - 2011 |
0 |
Organisations (1)
Significance for science
Object-oriented approach is a method that offers a selection of setting the parameters in every step. Effectiveness of algorithms combined in complex software is usually poorly known. Evaluation is then essential to understand their (in)stability and reliability, the quality of results (geometric and thematic accuracy), and to find proposals to improve the procedures. The results of systematic tests have shown that (given minor changes in conditions) the method of calculation in object-based procedures is not necessarily an objective (i.e. gives non-uniform solutions). Its transferability is due to the low and limited. We found certain approaches and decisions in the process can improve the consistency of identification of surface structures, but the geometric properties of objects determined in time-sequential image analysis is still variable, which complicates the object-oriented temporal analysis (tracking). Object-oriented technical support currently well responds to individual, specific-oriented issues, such as a unique satellite image classification. Worse supports object based change analysis, and lacks support to tracing change events on objects over time. With research we have come to the conclusion best potential for the progress of object-based image analysis is:
- implementing the multi-level (multi-scale) object-oriented approach,
- integration of sub-object properties in the phase of object-based classification (i.e. spectral signature of the segment, the degree of segment divisibility),
- upgrading of working practices in the phase of post-classification (i.e. contextual analysis of the object surroundings).
Taking into account these improvements object-oriented analysis of remote sensing data can reach a higher level of automation and can contribute to more consistent understanding of the structures in the environment and their representation in the remotely sensed images - no matter what input data we have and which software is used. Research results and insights obtained show existing tools in using up-to-date technology for evaluating the parametric methods are lacking, both in theoretical and practical domain. So, the fundamental and in-depth studies, as those conducted in this project, are relevant.
Research showed the use of object-oriented approach to classification of remotely sensed data is reasonable and promising, although not yet operationally ideal. Important advantage is it allows addressing the geographical reality more intuitively and closer to human perception. It overcomes restrictions known for pixel-oriented approach: change pattern is characterised, better facilitates the interpretation of change pattern, less dependent on radiometric inconsistencies in the imagery time series. Knowledge obtained offers a chance to reduce the lack of the current software support for object-oriented change analysis with remotely sensed data. This also improves transfer of knowledge from professionals to users in obtaining information from the satellite imagery, which is one of the aims of remote sensing community.
The study makes an important contribution to methodological development and advancement of monitoring changes with remote sensing data. The lessons learned both from biophysical (spectral) properties analysis of the surface and testing the object-oriented techniques are significantly important for:
- studies of continuous monitoring and change observation with satellite systems data (applicative aspect) and
- understanding of current technological capabilities supporting object-oriented studies and the direction of their upgrades (research aspect).
Completed survey is relevant contribution to international research activities and discussions on the evaluation of satellite imagery products at a variety of natural, technological and methodological circumstances. With knowledge obtained we will continue research on the appropriate use of satellite imagery for continuous monitoring applications.
Significance for the country
Observations from the satellites are both for the time-critical operations such as monitoring the effects of disaster events, and for the monitoring surface changes over time, an increasingly important way of studying the environment. Assessment of damage caused by disasters is difficult, in large part it could be improved with better knowledge and permanent monitoring (reference conditions) of spectral properties of the surface, exposed to different conditions and circumstances. Like many countries, also in Slovenia this has not yet developed. In this respect the research done is very relevant, as it strives to establish a starting point for the reference base of spectral (bio-physical) properties of the surface, oriented to the characteristics of the surface of Slovenia. Reference database would be useful for vegetation, urban development, disaster damage assessment and mitigation, and related studies and assessments of numerous institutions in Slovenia, as well as to help justify constantly evolving changes in the region. Object-oriented approach, we have thoroughly examined in the context of this research, may offer relevant support. Above all, this knowledge is crucial for proper understanding and interpretation of remotely sensed imagery.
For Slovenia, the results of research are also important for the successful informing of different disciplines on: the ability to acquire data of the Earth's surface state with satellite and aerial systems and sensors, the methods of their analysis and the understanding of the results obtained. In the case of events associated with flooding in September 2010 the results of research completed measurements, observations and analysis of numerous professional bodies (hydrological profession, administration office for disaster relief, other parties involved in disaster protection and prevention). The results of research also increased basic knowledge, and helped in strengthening the cooperation and interest among different institutions and professions in Slovenia with main aim to improve preparedness for similar events.
Most important scientific results
Annual report
2010,
final report,
complete report on dLib.si
Most important socioeconomically and culturally relevant results
Annual report
2010,
final report,
complete report on dLib.si
