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
