Map symbols for 1:10,000 scale Digital Topographic Map
Survey Department
7.2 Topographic Features_Control Points
No. Feature Class
Data
Class
Feature Name
Trigonometric
Topographic Control
Station
Feature
Point
三角点
Primary
Topographic Control Triangulation
Feature
Point
Point
一等三角点
Data Type
Definition
Acquisition criterion
Topographic Control Spot Height
Feature
Point
図化標高点
Symbol (Shape and Size)
The existed trigonometrical
station should be plotted.
The data will be acquired in
Colour : Black (0.15mm)
SDSL.
The result of trigonometric
station data will be provided by
USSAGALA 1.0 mm
2.5
mm
SDSL.
x 225.56 1.0 mm
The centre of trigonometrical
origin
0.4mm in diameter
station shall be plotted based
on the coordinates of point.
The existed primary
triangulation point should be
plotted.
The data will be acquired in
SDSL.
The result of primary
triangulation point will be
provided by SDSL.
The centre of primary
triangulation point shall be
plotted based on the
coordinates of point.
point
point
The existed fundamental
benchmark should be plotted.
Fundamental
Topographic Control
Benchmark
Feature
Point
水準点
Data Acquisition method
point
Colour : Black (0.15mm), Red
MANDAGALA 1.0 mm
2.5 mm
x
123.75 1.0 mm
0.4mm in
The data will be acquired by the Colour : Black (0.2mm)
field verification and in SDSL.
The result of fundamental
0.4mm in diameter
x A-21 1.0 mm
benchmark will be provided by
2.5 mm
225.56 1.0 mm
SDSL.
origin
2.5 mm
The centre of fundamental
benchmark shall be plotted.
The point whose has a height The spot height is located in the A photogrammetric
Colour : Brown
value by photogrammetric
following area, top of mountain, measurement will be applied as
measurement.
saddle, road crossing, etc.
a acquisition method.
0.5
10.1
point
The density is 9 points per 10cm
x10cm including other elevation
point and contour height value.
1/1
origin
1.0 mm