3D GeoInfo

• 3D/4D data acquisition, sensing technologies and laser scanning
• BIM, Digital Twins, Smart Cities, Smart Infrastructure
• Smart cities and Industry-Academia-Government Collaboration
• 3D/4D data processing and analysis, geospatial big data, and AI/Machine Learning
• 3D/4D data management - data quality, metadata, provenance, and trust
• Data integration, information fusion, multi-modal data analysis
• 3D/4D building/ infrastructure/ city modelling
• 3D/4D visualization, including gamification, virtual, augmented, and mixed reality
• Geo-information standards and GIS-BIM interoperability
• Applications of 3D/4D Geoinformation such as simulations and analyses (3D indoor and outdoor navigation, urban planning, land administration, disaster and risk management, energy modelling, facilities management, mobility, and accessibility, etc.)

SDSC

• GIS, urban informatics, ICT and smart cities
• Data science, visualization and City Analytics
• People flow data, mobility data and visualization
• Participation and empowerment
• Privacy, data security challenges in digital twins and smart cities
• Blockchain technology for municipal management
• Open data and open urban platforms
• Crowdsourcing data collection and analytics
• Monitoring systems
• Disaster management/warning systems
• Application of Artificial Intelligence (AI) and machine learning in smart cities
• Drones for monitoring/inspecting cities and construction sites
• Smart homes
• Real-time/web-based/interactive data visualization
• Cities' dashboards
• Smart Energy efficiency solutions, Net-zero-emission cities
• Data and analytics for circular economy in cities
• Smart transportation, automated driving and manned drone transportation
• Smart logistics
• Spatio-temporal patterns
• Big data/big spatial data analysis and management

LADM & 3D LA

• 3D LAS cost-effective workflow for new / updated 3D parcels = 4D (part of whole spatial development lifecycle: from planning/design / permit in 3D, to registration/use in 3D)
• Legal aspects for 3D LAS, best legal practices in various legislation systems
• BIM/IFC use and guidelines for design sources (LA_DesignSource)
• Remote sensing (including LiDAR) and artificial intelligence (AI) for efficient 3D cadastral boundary extraction in the survey sources (LA_SurveySource)
• Proposals for (and evaluations of) LA (remote) sensing information models and data processing workflows
• 3D LAS web-based dissemination (usability, man-machine interfaces, including mobile/AR)
• Focus on large cities, including developing countries
• LADM specializations for customary RRRs, such as STDM, SOLA/Open Tenure, MAST (possibly with attention for 3D and valuation)
• 3D in the revision of ISO 19152, the Land Administration Domain Model

You are invited to submit your contribution as full papers or abstract papers via the Conftool online submission system. These will be selected through a double-blind review process and should not be published elsewhere.

Accepted papers will be published in the ISPRS Annals or the ISPRS Archives. Both types of publications are listed in the ISI Conference Proceedings Citation Index (CPCI) of the Web of Science, SCOPUS, the E/I Compendex, and the Directory of Open Access Journals (DOAJ).

Submissions should be prepared according to the ISPRS guidelines. All accepted contributions must be presented at the conference.

• Accepted full papers (min 6 - max 8 pages) will be published in the ISPRS Annals (full paper double-blind peer review). Submissions must be anonymized. Papers not accepted for ISPRS Annals might be considered for the ISPRS Archives.
• Accepted extended abstracts (2 pages, 800–1000 words) will be requested to submit a final paper (min 6 - max 8 pages) and will be published in the ISPRS Archives (abstract double-blind peer review). The extended abstracts on their own will not be published.

Papers should be submitted via Conftool.

Sofia Airport

Sofia Airport is the largest airport in Bulgaria and is only 20 minutes away by metro from the city center. Sofia Airport has two terminals – T1 and T2. Sofia Airport provides direct free-of-charge transportation between the two terminal buildings.

The airport can be accessed easily form Sofia city by metro or bus.

Sofia Airport Metro Station

Sofia Airport Metro Station is located in the eastern part of Terminal 2. You can reach it by following the blue markings on the floor of the public area of Terminal 2. M4 Line of Sofia Metro connects Sofia Airport with the city center – at Sofia University Metro Station and at Serdika Metro Station. The trip takes about 30 minutes. By changing lines at Serdika Metro Station you can go to Sofia Central Bus Station and Sofia Central Railway Station. The metro trains from and to the airport run from 5:30 to 24:00 on weekdays and holidays. There are travel cards vending machines at Sofia Airport Metro Station. You can use Bulgarian banknotes or coins or a credit card to purchase a travel card. It costs 0.80 EUR. The single-trip travel card for the metro has to be validated at the validators at the entrance to the metro stations. Each travel card can be used up to 30 minutes after being purchased. A single travel card for metro you can buy also from the metro cash-desks located next to the metro's entrance. You should keep your travel card till the end of the trip.

Bus lines E84, E184, 384

Bus line E84 runs from Sofia city center – bus stop Gen. Gurko Str. (bus stop № 1903), to Sofia Airport Terminal 2. From Terminal 2 it runs to Sofia Airport Terminal 1 and then back to Sofia city center.

Bus line E184 runs from Sofia city center - bus stop Gen. Gurko Str. (bus stop № 1903), to Sofia Airport Terminal 1. From Terminal 1 it runs to Terminal 2 and then back to Sofia city center.

Bus line 384 runs to Sofia Airport – Terminal 2 from Druzhba 2 district. The bus service starts from Druzhba 2, goes along Christopher Columbus Blvd. through Druzhba 1 to Terminal 2 and then goes back following the same route.

The bus lines operate under an all-day timetable. The exact times, including the first and last buses, are published on the website of Sofia Urban Mobility Centre. The journey with buss lines E84 and E184 takes around 45 minutes to reach the airport from the city center. The journey time from the first to the final stops of bus line 384 bus route is about 25-30 min on weekdays and weekends/holidays.

Public transport tickets in Sofia can be purchased via contactless bank card/phone, official mobile app (MPass), vending machines at metro stations, or from kiosks, costing 0.80 EUR (30 min) or 1.10 EUR (60 min). Contactless validation is mandatory on all buses, trams, and metro gates.

Tip: Tap your Visa/MasterCard, phone, or smartwatch directly on the blue Validators (card readers) located on all buses, trams, and trolleybuses. If you tap the same card 3+ times in a single day, it will automatically charge a daily cap of 2 EUR. You must tap every time you enter a vehicle, even when transferring.

Requirements when entering the country

The Republic of Bulgaria is part of the Schengen area.

A foreigner may enter the Republic of Bulgaria if he/ she is a holder of a regular foreign travel document or another equivalent document as well as a visa if required.

Visa issuing

A foreign citizen wishing to apply for a Bulgarian visa shall hold a regular travel document that meets the following requirements:

• its validity expires at least 3 months after the intended date of departure from the territory of the Republic of Bulgaria or in case of multiple visits - after the last scheduled date of departure from the territory of the Republic of Bulgaria;
• contains at least 2 blank pages for visa purposes;
• has been issued within the last 10 years.

Visas are issued by the diplomatic and consular representations of the Republic of Bulgaria.

Visa applications

Visa applications forms are submitted not earlier than 3 months before the date of the intended travel, personally or through an authorized agent, with the exception of humanitarian cases.

Register as soon as you can for the event and request a Letter of Invitation during the registration process.

Visitors can find further information on the application procedures and required documents for the issuance of visas, as well as the address of consular offices, on the website of the Ministry of Foreign Affairs.