FACTORS THAT CAN BE READ ON A MAP

FACTORS THAT CAN BE READ ON A MAP

a staple on the horizon

distance

direction

location

parallel meridians = by observing parallel (latitude) and the meridian (line of longitude)

direction and distance

the distance with the distance

height

direction and direction

position = specifies where resection we stand in the field of the unknown on the map. With the help of two points that are identified either on the map or in the field.

intersection = specifies an appearance that does not exist in the map, but there are in the field with the help of two well known point in field as well as on the map.

LOOKING FOR SCALE

compare the points on a map with dots in field

compare it with other existing maps his scale

P2 = (D1/D2) x P1

d1 = the distance on the map is already known

d2 = the distance searched his scale dipeta

p1 = the denominator known map scale

p2 = the map scale denominator is sought

take into account the difference in degrees of latitude

10 = 60 ' = 111km

Ex: difference 5 ' then

the difference then 5 ° 5 ' = (5 ° e/60) x 111

for topographic maps

Ci = (1/2000) x the denominator allusions