ASPECTS OF DATA MODELING OF FUSED SURFACES WITH PLANIMETRIC 
DATA IN A TOPOGRAPHIC GEODATABASE 
Hussein M. Abdulmuttalib 
GIS Engineer, GIS Center, Dubai Municipality,Ph.D. Student Budapest University of Tecnology and Economics, Department of 
Photogrammetry and GIS, 
Hungary,(1111)Budapest Karinthy Frigyes Utca 14, I em. 3, 
enghussein_h@hotmail.com, hmabdulmutalib@dm.gov.ae 
Commission IV, Working Group VL1 
KEY WORDS: GIS , Photogrammetry, Modeling, Surface, Contour, Raster, TIN, Accuracy 
ABSTRACT: 
discuses the investigation of modeling 3D 
in a geodatabase, maintaining the special 
ts of the surface data, its 
As a result of building a topological surfaced geodatabase for the test area, the paper 
surface data, and its fusion with other planinmetric modeled data, and storing it 
relationships of the data, its retrieval and representation methods, taking into consideration the quality aspec 
validity, and its structured properties. 
In older days geographic, topographic, cadastral and thematic map 
these maps in many cases contained surface information, using fo 
collected with a special accuracy, coinciding with the grade of goodness of extracting these elements from the maps. 
Now a days maps still play an important roll in the information technology world, with an exceptional event of form and nature 
variation, altogether with its flexibility they became dynamically created by the GIS user from a distance through networks, to suit 
her/his or the client's requirements, thus creating digital thematic maps and reports, which means the source of this information 
(Geodatabase) has to be prepared with an up to date information , composing planimetric data and surface data altogether with their 
relationships stored, which shall regulate the way of retrieval, presentation and updating of the data and information, as well as 
quality aspects. 
s where produced to represent special information to the user, 
r example contour lines with specific thickness, interval, and 
which uses an internet GIS application software that provides the user with online 
A particular example is chosen for investigation, 
data selected from the map composer or using the inquiry system, retrieved from a 
raster images, combined with the particular vector 
Geodatabase. 
So what happens when the users requires surface information to be combinec 
investigation facts, and others: 
What kind of data categories complies with which surface style it can be shown. 
(Vector, Raster, contours, spot heights, 3D modeled surface, ..etc ) 
What are the viewing aspects that shall be considered when adding these surfaces. 
(Scales, transparency, colors, thickness, interactions with other data, ete ) 
Should the quality of the surface be indicated. 
(In many cases the accurate height information demanded, the quality may deceive) 
What is the validity of the information. 
(time of acquisition, changes happened in a particular area, ..etc) 
What are the relationships of the data, the surfaces should maintain in the 
Geodatabase 
| with their maps; this shall rise up the following 
1. INTRODUCTION: 
planimetric data within GIS platforms are of importance for 
showing the accurate information for decision making and 
should be taken care of through modeling rules and tools of 
geodatabases. 
These rules should be designed and invented to solve the 
representation of the surfaced data, taking into consideration 
the type of data, its accuracy, its degree of goodness to 
express the surfacc when combined with different categories 
of planimetric data, and the cartographic rules such as 
exaggeration, generalization and other rendering rules. 
Different data structure types of surfaces contribute to a 
certain accuracy, depending on the sources of the data and its 
accumulating errors due to processing and interpolation. This 
accuracy can not be realized by the end user just by looking 
Maps of a particular scale fouls under a category of 
geographic, topographic or cadastral, each of which has its 
own way of representing and showing surface topography on 
there margins which was traditionally expressed by the 
isometric curved lines (contours), The height difference 
between successive contour lines depends on the scale of the 
map among other factors; which limitations is a function of 
the smallest readable element from the map and the steepness 
of the surface. In comparison with conventional mapping 
techniques GIS presents surfaces in many ways one of which 
is the contour lines, which is unique among other surface 
presenting formats due to its capability to be contributed to 
final digital two dimensional planimetric details without 
covering it, but the rules of representing the surface upon the 
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