TOPOGRAPHIC SURVEY

Question 1

A survey made to secure important
data from which a topographic map
could be made

Answer 1

TOPOGRAPHIC SURVEY`

Question 2

Establishment of a horizontal control by measuring angular
and linear

Answer 2

Topographic Survey

Question 3

Establishment of the vertical control by determining the
elevation control points by leveling or using plane table.

Answer 3

Topographic Survey

Question 4

Determining the elevations and location of some important
features as many deem necessary for the preparation of
the topographic map.

Answer 4

Topographic Survey

Question 5

Computations of elevation, distances and angles as
obtained from the previous field work undertaken

Answer 5

Topographic Survey

Question 6

• Preparation of the Topographic map, or a representation of
  terrestrial relief.

Answer 6

Topographic Survey

Question 7

Methods of Representation of Relief

Answer 7

Shading
* Hachures
* Relief models
* Form lines
* Contour lines

Question 8

Types of Contours

Answer 8

Index contours
Intermediate contours

Question 9

All points on any one contour have the ______ elevation.

Answer 9

SAME

Question 10

Every contour ____ on itself, either within or beyond the limits of the map. The closure may occur within the mapped area, but often happens outside the area and hence will not appear on the map sheet.

Answer 10

closes

Question 11

A contour which closes within the limits of the map indicates either a ________. Contours which increase in elevation represent ____; those which decrease in elevation portray ________.

Answer 11

summit or a depression
hills
valleys or excavations.

Question 12

Contours on the ground cannot cross one another except where an ___________ is represented on a map.

Answer 12

overhanging cliff, a vertical ledge or
wall

Question 13

Contours are __________ on a uniform slope.

Answer 13

spaced evenly

Question 14

Contours are ________ to each other on a plane surface.

Answer 14

straight and parallel

Question 15

_______ contours signify rough, rugged terrain.

Answer 15

Irregular

Question 16

The horizontal distance between adjacent contours indicates the ______ of the slope of the ground. Where the contours are relatively close together, the slope is comparatively ____-; where the contours are far apart, the slope is ______.

Answer 16

steepness
steep
gentle

Question 17

Contours cross curbs and a crowned sloping street in typical ________ curves.

Answer 17

U-shaped

Question 18

As a contour approaches a stream, the contour turns ____ until it intersects the shore line. It then crosses the stream at right angles to the center of the bed, and turns back along the opposite bank of the stream. If the stream has an appreciable width, the contours are not drawn across the stream but are discontinued at the shore, with which
it merges.

Answer 18

upstream

Question 19

vertical distance between two adjacent contour
lines

Answer 19

CONTOUR INTERVAL

Question 20

SR = MD/GD

Answer 20

SR: scaled ratio (unitless)
MD: map distance
GD: ground distance

Question 21

____ = 𝒅𝒊𝒇𝒇𝒆𝒓𝒆𝒏𝒄𝒆 𝒐𝒇 𝒊𝒏𝒅𝒆𝒙 𝒊𝒏𝒕𝒆𝒓𝒗𝒂𝒍/
𝒏𝒖𝒎𝒃𝒆𝒓 𝒐𝒇 𝒊𝒏𝒕𝒆𝒓𝒗𝒂𝒍

Answer 21

𝑪𝑰

Question 22

ANALYTICAL METHOD

Answer 22

Hsubm/de = H/DE

Question 23

Two major classifications of obtaining contours

Answer 23

Direct method
Indirect method

Question 24

contours to be plotted are actually
traced out in the field.

Answer 24

Direct method

Question 25

points located as regards position
and elevation are not necessarily situated on the contours to be shown, but serve, on being plotted, as a basis for the interpolation of the required contours.

Answer 25

Indirect method:

Question 26

STEPS IN COORDINATE METHOD

Answer 26

1. On a grid system, lay out the area by establishing corner and perimeter stakes.
2. At the intersections of the grid lines, determine the elevations.
3. Plot the points of known elevation to the desired scale in plan.
4. Draw the contour lines by interpolation

Question 27

Methods of expressing slopes

Answer 27

percent/ grade
degrees
grads
gradient
mils