slide building generalizated tool for road data of big scale topographic map

BUILDING GENERALIZATED TOOL FOR ROAD DATA OF BIG SCALE TOPOGRAPHIC MAP The 14th Conference on Science and Technology HCMC University of TechnologySection of Geomatics Engineering... Gen

BUILDING GENERALIZATED

TOOL FOR ROAD DATA OF BIG

SCALE TOPOGRAPHIC MAP

The 14th Conference on Science and Technology

HCMC University of TechnologySection of Geomatics Engineering

Why do we generalizate?

Satellite image Map

What is generalization?

generalization of objects that are displayed

on the map to suit the purpose of use, scale, subject map and characteristics of territories.

Some softwares have generalizated tools

Generalizated tools

in ARCGIS software

In ArcToolbox of ArcGIS, generalizated tools are organized into Generalization toolset

Generalization:

complicated

Use ARCGIS software Not easy!

Knownledge About quota generalization Know how to use software

Process of generalization

Solution for road data

Generalizated form Objects

Keep (maintain) Railroad in Station ; Notes; Past; Bridges; Street under water;

Harbour; Dock; Lighthouse; Dangerous areas

Eleminate

reject

Float bridge past railroad; Intersection of street and railroad;Beacon; Milestones; road sign, Pavement, Roadside; lane,park…

Change symbols Types of railroad

Solution for road data

Count width of objects and collapse dual

lines to centerlines

Land road ; Gravel road; concrete, asphalt paved road; Deep slit road, …

Reject depend on length, density

Then collapse dual lines to centerlines

Big land road

Reject depend on length, density

Simplification

Change symbols

Land road, trail, foot path

Solution for residential data

Generalizated form Objects

Aggregate blocks of house

If distance between buildings < 0,3mm 

gather to block

Fire – resistant housesBlock of fire – resistant housesLess fire – resistant housesBlock of fire – resistant housesReject Unexpected house A map only has less 5 ones

Reject If area < 1mm2 Houses that don’t have wall

Reject If area < 2mm2 Broken houses

Reject Eaves, Steps, Outdoor stairs, Tanks

Solution for river data

Generalizated forms Objects

Reject If area < 2mm2 Ponds, lakes

Simplification Road edge of river

Reject if area < 15mm2 Coral beach, Seaweed beach, riverside

beachReject if length <5mm Dike

Collapse dual lines to centerlines Channel, drain

Project for road data

Project for residential data

Project for river data

Design function

Data

Function after generalizated

- Displacement

- Update attribute

- Evaluate result of

Building menu

Building tools:

 Tool for importing quota of generalization

Tools after generalization

 Tool for finding overlapping error

Building tools for data

conversion

Building tool for merge maps

Building tool for selecting coordinate system map tool

Generalizated map tool

Tool for finding overlapping

error

Displacement tool

Tool for evaluating result of

generalization

Thử nghiệm

Before

After

Review results

Review results

Asphalt paved road before and after

generalization

Review results

Review results

Causeway before and after generalization

Review results

Drain before and after generalization

Review results

 After generalizating, there are some error:

Find overlapping error between foot path and drain Error at the top

of the roads

 More studying about generalized operators to diversify map generalization tools for road data as well as residential data and river data.

 Building intelligent database or data geodatabase (the type of behavior) is much more complex case.

 B Books, Technical Reports, Doctoral thesis, Websites,…

 5 Lee, D., Hardy, P.,-Automating Generalization–Tools and Models In 22nd ICA Conference Proceedings, A Coruña, Spain (2005).

 6 Nhữ Thị Xuân ,- Bản đồ địa hình Hà Nội: Nhà xuất bản đại học Quốc gia Hà Nội (2003)

 7 Quyết định số 70/2000/QĐ-ĐC của Tổng cục địa chính ngày 25 tháng 02 năm 2000 về việc Ban hành Quy định kỹ thuật Số hóa bản đồ địa hình tỷ lệ 1:10000, 1:25000, 1:50000 và 1:100000 (2000).