Accurate Basemap for
Urban Projects using
H.R. Stereo Satellite Imagery
Mohtassam Zahra
Co- G. Manager
FugroMAPS sarl
11 November 2014
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
Building Accurate GIS basemap for Urban Projects
Steps required to build accurate GIS basemap for Urban Planning Projects:
• Stereo collection of the satellite imagery
• GPS Ground Control
• Aerial Triangulation Adjustment
• 3D Topographic Feature data collection
• Topological Data Cleaning
• 3D Building Creation
• Digital Terrain Model Stereo editing
• Digital Surface Model Generation
• Geodatabase creation
• Field data collection with attributes
• Geodatabase attributes Linkage
• Utility Collection and GIS conversion.
• 3D Model presentation.
• Recommendations
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
H.R. Stereo Satellite Sensors
Various sources of high resolution Stereo Satellite Images and their spatial resolutions:
World View3 30 cm ….starting from February 2015
Geo Eye - 0.50m Resolution
World View-1 / World View-2 - 0.50m Resolution
IKONOS - 1 m Resolution
Quick bird - 0.60m Resolution
Pleiades – 0.50m Resolution
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
Stereo Satellite Acquisition Parameters
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Advantages of the Stereo Satellite Acquisition
Cost Effective
GSD =< 50 cm available
Eliminates all flying security permits & clearances
Removes all flying risks
High Agility of Sensors (RPC)
Fewer Ground Control Points
Complete Digital workflows
Accurate detailed map
Data Repetitively
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
Ground GPS Control Selection
The figure above shows;
Observation of Ground Control Points by
specialized surveyors in the field using latest
High accurate survey techniques which is the
GPS to provide accurate coordinates for the
Rectification of the stereo satellite imagery.
Based on extend of the area the definition
of the number of GCPs will be determined
To provide maximum accuracy with minimum
Ground Points for rectification.
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Ground Survey Report
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Satellite Triangulation
Using the most advanced commercial Remote Sensing software in the Triangulation
Inputs: RPCs (Sensor geometric parameter) of both images + GPS Ground Control Points in
addition to the generation of the Tie points spread over the stereo Model in the AT.
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Aerial Triangulation
Stereo control points measurement plus Tie-points in stereo / Block adjustment
After observation Block Adjustment is carried.
Achieved accuracy in xy& z in kirkuk block better than
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
3D Feature Collection
After the Block Adjustment, Stereo
model will be ready for 3D data
collection:
3D Topographic feature including
3D terrain breaks & spaced DTM for
the accurate generation of DTM
generation
Where the following products will be
produced:
GIS Topographic mapping
2meter Digital Terrain Model
1meter Digital Interpolated Contours
1meter Digital Surface Model (merged 3D Buildings & DTM)
0.5m orthorectified satellite imagery
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Digital Terrain Model Generation (DTM)
The Digital Terrain Model is automatically generated using the 3D Software
This DTM is edited in stereo in addition to the observation of the 3d breaklines to
provide accurate terrain heights
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1m Digital interpolated Contour Lines
The Digital Elevation Model is automatically generated using the 3D Software
This DEM is edited in stereo in addition to the observation of the 3d breaklines
to provide accurate terrain heights
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1m Digital Surface Model
The Digital Surface Model is generated through the merging of the DTM and the
3D Buildings
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1m Digital Surface Model
The Digital Surface Model is generated through the merging of the DTM and the
3D Buildings
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
0.5m Orthorectified Satellite Imagery
Using the aerial triangulation adjustment parameters of the imagery, in the
orthorectification process in addition with measured DTM & the enhanced 0.5m
imagery as input to produce the 0.5m orthorectified satellite imagery.
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
3D Topographic Feature Collection
The 3D Topographic features means; mapping all Landuse layers found on stereo image
such as: Buildings, Roads, Street furniture, Green areas, Water Bodies, Bridges, Open
areas, Vacant Lands, Boundaries, Walls, Fences…etc
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
Topology Cleaning prior GIS conversion
MicroMAPS is an in-house Fugro MAPS development; it has been developed to exploit the
new capabilities of digital stereo workstations, the constructive power of CAD, the
automation facilities provided by GIS and the management of databases. MicroMAPS
enables collection and editing of structured digital mapping within quality assurance and
quality control procedures.
Topology Cleaning in carried out inside MicroMAPS prior the conversion to GIS “MMPW
Geodatabase” for the Master Plan projects
The cleaning involves;
Removal of dangles (over shots and under shoot), overlapping of segments, duplications
of data, missing or multiple centroids, voids…etc
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Geodatabase Design
Geodatabase design was
commenced for the
project based on the client
requirement “Ministry of
Municipalities & Public
Works – Urban Planning
departments” where:
• Feature Datasets were
created for the Landuse
with
• Topographic Landuse
Feature Classes including
Domains and Subtypes
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Field data Preparation for Field Collection
GIS basemap was prepared for the field Surveyors:
1. The Landuse layers (Parcel Boundaries, Buildings and Landuse feature classes)
were overlaid on top of the orthorectified corrected imagery.
2. Using the extension “Hawths Tool” in ArcGIS , Hawth's Analysis Tools is an
extension for ESRI's ArcGIS to generate random points (or stratified random point)
for the demographic data collection in addition to the full survey of the built up
boundaries.
3. Field Templates were generated to meet the project requirement for the full
attributes
4. Centroids point generation of the digitized boundaries were performed and fed
into the handheld GPSs’ of the survey crew for field data collection
5. Project area was divided into sectors and spread among the field crews for
speeding up the data collection.
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Field Attributes Data Collection
Hawth’s sampled output
Field Data Collected No. of
Attributes Units
Sampled Survey 3,662
Full Survey 8,798
Total Field 12,460
Collected Attributes
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
Field Attributes Data Collection
The Mapped data as
well as the extracted
sampled and full
survey points were
sectorized and
distributed over 10
survey crews for field
attribute data
collection
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
GIS Basemap (Stage-1) for Field data collection
The topographic mapped Landuse features were imported into the designed Geodatabase
after topological cleaning stage. This GIS basemap was sent to the field for data attributes
collection.
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Field data Preparation for Collection
Field Survey Templates were prepared for the data collection:
1. Family-SurveyTemplate
2. Labor-SurveyTemplate
3. Urban-Landuse-Status-SurveyTemplate
4. Medical-SurveyTemplate
5. Social-Security-Institutions-SurveyTemplate
6. Other-Social-Institutions-SurveyTemplate
7. Educational-Service-SurveyTemplate
8. Educational-Sportive-Institute-SurveyTemplate
9. Transportation-SurveyTemplate
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GIS Basemap Linked with Field Attributes
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GIS basemap Linked with Field Attributes
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
GIS Utility Data
Utility maps were
collected from the
various department
within the city and
were converted in GIS
layer within the
Geodatabase such as:
• Water
• Telecom
• Power
• Sewer
• Solid Waste
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3D perspective view
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3D perspective view
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Fly Through
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Advantages of Stereo Mapping verses Mono
Below table shows the importance of carrying out base mapping from Stereo Satellite
imagery verses the usage of Mono ortho-satellite
3D Mapping from Stereo Satellite 2D Mapping from Mono Ortho-Satellite
3D data collection (XY & Z) 2D Data collection only (XY)
Generate accurate DTM & Contours Not possible.
High positional accuracy of Building prints Less accurate due to inclination .
Generalization of features is minimal More Generalization is considered
Determine well the boundaries of small & sometimes is missing leading
Dense features / Objects
Easier in feature classification Sometimes harder, where skilled staff are
required.
Serves Multi-user segments Limitations on Multi-user usage
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
Recommendations
For establishing accurate basemap, we recommend the
use of
“Stereo Digital Mapping Techniques“
to provide various 3D-products that serve
Multi-user segments
Seventh Conference of Arab Experts on Geographical Names - Jordan www.fugrogeospatial .com
Thank You
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