11 th International Scientific and Technical Conference September 19–22, 2011, Tossa de Mar, Spain...

11th International Scientific and Technical Conference

September 19–22, 2011, Tossa de Mar, Spain From imagery to map: digital photogrammetric technologies

[email protected]

UPDATING OF BULGARIAN LARGE SCALE UPDATING OF BULGARIAN LARGE SCALE TOPOGRAPHIC MAPTOPOGRAPHIC MAP BY DIGITAL BY DIGITAL

PHOTOGRAMMETRIC SOFTWARE PHOTOMOD 5.1PHOTOGRAMMETRIC SOFTWARE PHOTOMOD 5.1

GIS-SOFIA Ltd.,GIS-SOFIA Ltd., BulgariaBulgaria

Vanya Petrova, M. Sc.

INTRODUCTION

• 1920 - 1930 – Start application of large scale topographic mapping

by aerial photogrammetry in Russia and USA• 1939 – 1945 – During the Second World War large scale mapping

became common occurrence for all countries,

participated in the war• After 1945 – All European countries started topographic mapping

by aerial photogrammetry

Updating of Bulgarian large scale topographic map by digital photogrammetric software PHOTOMOD 5.1 , Vanya Petrova

September 19–22, 2011, Tossa de Mar, Spain

From imagery to map: digital photogrammetric technologies11th International Scientific and Technical Conference

PHOTOGRAMMETRY IN BULGARIA

• 1942 - Start application of aerial stereophotogrammetry for production of

topographic map at 1:25 000 scale• 1955 - Start application of aerial stereophotogrammetry for production of

topographic maps at 1:5000 and 1: 10 000 scale

All maps periodically are revised• 1983 - 1996 - Orthophotoplans at 1:5000 and 1:10 000 scale are prodused

over 85% of Bulgarian territory, intended for rural cadastre• 2006, 2010, 2011 - Orthophotoplans at 1:10 000 scale are made for the

Ministry of Agriculture and Food over the 98% of the territory

of Bulgaria (111 000 sq. km)• 2008 - Digital aerial photogrammetry is used for production of

orthophotoplans at 1:1000 and 1:2000 scale over territory of 1467 sq. km

Sofia Municipality, as well as generation of DTM




DIGITAL PHOTOGRAMMETRY AND GEO DATA

Aerial photogrammetry

Satellite photogrammetry




WHY DIGITAL PHOTOGRAMMETRY?

• High accuracy, good visualization with high pixel resolution and quick results over the large territories (thuss updating topographic maps will compensate the loss of time)

• Satellite sensors may soon replace the aerial photography• These images would be captured and transmitted as digital data, which could be

processed by computers

• There are enormous fields where digital photogrammetry can be used, for example

creation of 3D models, etc.




THE PILOT PROJECT

PURPOSE

TECHNICAL REQUIREMENTS

• To create new technical specifications according to the modern standards and technologies and to meet user needs

• For identification of main activities and rules for creating digital large scale topographic maps (1:5000, 1:10 000), map content, technical processes

• To serve as a solid basis for current technical specifications, regulating the requirements and guidance of technology for creating and updating digital topographic database collection and use of topographic information

• Bulgarian Geodetic System - BGS 2005• Digital model• Accuracy - according existing technical specification• Classification of map symbols• Filling in database from various sources of information




THE PILOT PROJECT

SCOPE OF THE PROJECT

• Photogrammetric processing• Interpretation and stereovectorization• Determination of metric characteristics of the terrain, landforms and vegetation,

as well as determination of roads, rivers, streams etc. width • Creating a database• Using the elements of digital cadastral map• Database of geographical names• Printing the map




THE PILOT PROJECT

WORK FLOW

• Photogrammetric processing and stereovectorization Terrain forms Railways Rivers and water areas Pipelins and equipment Supporting walls Buildings and other features• Field inspection• Adding the information after inspection• Creating a database• Cartography process• Printing the map




GENERAL INFORMATION

• Area: 1467 sq. km • Terrain: flat, lightly hilly and hilly low houses• Average height of the terrain above sea level: 750 m

AREA CHARACTERISTICS




• Blocks of aerial pictures…………………....……………......……........ 36• Strips of aerial pictures……....…....................................................... 58

• Aerial pictures………………....………..............…….......................5669 • Ground pixel size (GSD).....10 cm (urban area) and 20 cm (rural area)• Average flight height…...1000 m (urban area) and 2000 m (rural area)• Pre-marked points on the terrain………..……………….……….…. 393• Pictures per 1 pre-marked point…………..……………………………14

CONFIGURATION OF PHOTOMOD 5.1

• PHOTOMOD Core• PHOTOMOD AT• PHOTOMOD SolverA• PHOTOMOD SteroVector• PHOTOMOD Mosaic

OTHER SOFTWARE PRODUCTS USED

• ArcView• AutoCAD low houses• ArcGIS• Adobe Illustrator• CorelDraw







CREATING OF DIGITAL MODEL OF DATA




CREATING OF DTM




CREATING OF DATABASE

• Geodetic data - triangulation and working networks• Topographic data - points, lines, polygons Structure of geospatial data Sources and methods for acquisition of geospatial data Requirements of minimum attribute information for graphic data and

metadata Technical specification for quality of geospatial data

Vector Data Format ESRI Feature Class – points, lines, polygons

Raster Data Format Raster Catalog - JPG

Resolution of raster data 0,10 m

Scale 1:5 000

Language Bulgarian

DATA FORMAT

CONCLUSIONS AND RECOMMENDATIONS

• Concerning the modern digital technology and the steady increase urban territories, it is necessary to create and update the entire topographic information

• For the new method of mapping i.e. new technologies, technical means and software it is needed to create new ordinances or to update the old ones

• The digital technology significantly reduce the time required for producing or updating maps and will improve the overall accuracy

• Classical mapping is supplemented by new types of visualization systems from different platforms

• The pictures themselves represent huge opportunities for visualization and analysis of 2D, 3D and 4D data

• These capabilities must be integrated into e-government and e-commerce development

• Internet provides more efficient means of communication than printed media

especially when it comes to rapidly developing technology




THANK YOU FOR YOUR ATTENTION !THANK YOU FOR YOUR ATTENTION !




11 th International Scientific and Technical Conference September 19–22, 2011, Tossa de Mar, Spain...

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