Topographical mapping and generating digital surface model ...
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Topographical mapping and generating digital surface model
using remote sensing
Hiroaki TANAKA
Technology Development Office,Topograhic Department
Geographical Survey Institute of Japan(GSI)
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IKONOS image�resolution:1m��Shizuoka Prefecture�
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High resolution satellitesGround resolution (m) / Band width (km) chart of operational satellite image products
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Required evaluation of satellite image products for topographic
mapping
• Evaluation of geometric accuracy – Geometric accuracy of 2D/3D measurement
using satellite images with/without GCPs
• Interpretation test from satellite images– Image reading test– On-site verification
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Permissible accuracyPermissible accuracy of 1/25,000 scale map
(Maximum permissible errors)
�Mapping : 7.5m
�Updating : 12.5m
• Horizontal
• Vertical
�Both mapping and updating : 2.5m
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Evaluation of satellite image for topographic mapping
compared the result of drawing with a topographical map
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Observation Date of images : April 22, 2003Off-nadir angle : 28.7 degree (forward view)
27.2 degree (backward view)���� : checkpoints (60pts)
Yokosuka city and its surroundings nearby TokyoElevation : 0 – 241m
Distribution of checkpointsLocation of test field
������������ �Test Field
Tokyo
Bay
Tokyo
Yokosuka
Evaluation of QuickBird stereo image
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Evaluation of QuickBird stereo image
Coordinates measurement from imagery �RPC-model�
Measurement by GPS(Fast-static GPS)
Measurement of check points
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Comparison of coordinates (Horizontal component of error vectors)
3km
N
3km
N
After correction with one GCPRMSE:1.37m
Before correctionRMSE:13.47m
Evaluation of QuickBird stereo image
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Comparison of coordinates (Vertical errors)
After correction with 3 GCPs taken from coastline
RMSE:0.44m
Before correctionRMSE:1.42m
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Evaluation of QuickBird stereo image
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Extraction of features using Digital Photogrammetry Workstation
�hilly area� �urban area�
�Susono city in Shizuoka Prefecture
������������ �� ��������������Interpretation test ������������
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Mission�����������•� �������� ������•������ ���������•� ����� ���� ���
PRISM2.5m-spatial resolutionthree optical systemPanchromatic sensor
AVNIR-210m-spatial resolutionMulti-band(BGRNIR�sensor
PALSAR10m-spatial resolutionL-band SAR
From JAXA HP
Advanced Land Observing Satellite�ALOS"Daichi"�
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Topographical Mapping using "Daichi" ImagesObservation: 8times/year
Collect changed features
Efficient revision of
topographic maps
1/25,000Topographic
mapping
Generate Ortho satellite images
Generate a 3D model by a stereo pair
forward backward
Revision of maps overlaying ortho images
Precise mapping and measurement
by a Digital Photogrammetry
Workstation
"Daichi"/PRISM triple line sensor
2.5m Ground Resolution nadir images
Automatic DSMgeneration
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Evaluation of "Daichi"/PRISM image quality
• Evaluation of geometric accuracy – Geometric accuracy of generic pushbroom
sensor model applied to PRISM images using GCPs
• Interpretation of PRISM image– Image reading test– On-site verification
• Evaluation of DSM generation– Accuracy of DSM generated by
"Daichi"/PRISM stereo pairs
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Evaluation of geometric accuracy
• Used geometric models
• Test areas and data
• Method
� Generic Pushbroom sensor model� Orientation parameters were calculated by conventional
triangulation method using some GCPs
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� Comparison using 30�50 GCPs as check points
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10 m
Fukuoka
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Horizontal error vector
©JAXA
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Image interpretation
• On-site verification
• Image reading test� Identification of features included in 1/25,000 scale map
� An experiment of feature change extraction
� Comparison of extracted changes with ground truth data
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PRISM�Panchromatic�
PRISM-AVNIR2�Pan sharpen�
Reading test : Road(5.5�13m width)
Evaluation�������� �� ���� � ��� � � � � �� �� �� �� � �� � �
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©JAXA©JAXA
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Evaluation of DSM generationTest Aria
Image Specification
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Fukuoka City
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Effect of filtering
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Before filtering After filtering
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Evaluation of DSM generation
Lidar DEM
"Daichi"/PRISM DSM
Height range ���� 0����359m����Total grids ����3149304
Errors (height) on reference points (98 pts.����
Discrepancies between "Daichi" DSM and Lidar DEM
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Evaluation of DSM generation
0-50 50-30 3010-10
Num
ber
of p
ts.
500000
Discrepancy(m)
Num
ber
of p
ts.
Discrepancy(m)
5000
0-25 45-15 255-5 15
Distribution of discrepancies (City center)
Distribution of discrepancies
(Total)
"Daichi" DSM-Lidar DEM�� �� ��� ��
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Conclusion
• High resolution satellite image with several GCPs has enough accuracy to make 25000 topographical map
• It is possible Daichi/PRISM image generate DSM automatically and constantly.