Explain the second and third phases of the topography mapping work.
Answer
Each map has a range of $15$ latitudes to $15$ longitudes.
Each subsection is given a score of $1$ to $16.$
Therefore, $16$ degrees of $A, 164$ of $B, 16$ of $C$ of each degree sheet map are calculated as follows and a total of $256$ maps are prepared.
Previously, the scale of such a wide map was kept as $1$ inch: $1$ mile.
Hence they are called one inch maps.
The map is called the indicator number of the map given according to this method.
Phase II: In this phase, $16$ more sections of each number are done. The perimeter of this subsection is kept $1^\circ$ latitude $\times\ 1$ longitude.
Each of these subdivisions is nominated from the English alphabet $A$ to $P. $ The order of writing the letters is from north to south. It covers an area of $1^\circ$ degree so it is called a degree sheet.
Saraswati, Amardasi, Mayani and Pushpavati are small rivers flowing through the region.
Saraswati and Amardasi are the major rivers of the region.
In the northern part of the region, the Saraswati River, which flows in a continuous pattern from east to west, forms small and large ravines.
Siddhpur, situated on its northern bank in the middle, is an important town of the region.
Water does not flow for many months in the catchment area of this river upstream east of Siddhpur, so there is a temporary river in that part.
The Amardasi, Mayani, and Pushpavati rivers are also temporary rivers.
Amardasi River is a tributary of Saraswati River.
The Mayani River, which starts from Gharewada village in the north, flows in the southwest and joins the Amardasi River.
The Amardasi River also flows southwest and joins the Saraswati River in the far west. In the central eastern part of the region, gullies are found on both the banks of the river Pushpavati starting from the rocky region in the far east and flowing towards the south.
Rotted soils seem less useful for farming.
Bala Sarovar in the far north is the only large and permanent lake in the region.
Its circumference is about two sq. Km. Is.
In addition, there are a number of small lakes in the region.
$(1)$ The method of direct observation is excellent for the study of geography.
But due to limited time and resources it is impossible to visit the site of the region.
Thus any region is studied with the help of maps.
$(2)$ Maps are most commonly used to determine the geographical location of a place or region.
$(3)$ In order to make the depiction of some events more effective, maps of the place are placed in current papers and magazines as well as important news in television.
$(4)$ Maps have become useful not only for geographers but also for historians, botanists, engineers, etc., for the study of their respective subjects.
$(5)$ The three wings of the army are widely used for the defense of the country.
$(6)$ Maps have been blessed for aerial and maritime affairs and oceanography, space exploration and exploration of new continents.
$(7)$ Maps have also made inroads in the world of advertising.
$(8)$ Maps have become indispensable in the schedules of public buses, railway planes etc.
$(9)$ Illustrated pamphlets introducing historical or tourist attractions or spectacular beauties become especially attractive and useful with maps. Thus, maps are widely used in the modern age.
Write a note about the first phase stating the stages of mapping work.
Answer
Phase three. $(1)$ First phase $(2)$ Second phase $(3)$ Third phase. Phase I: In this phase, areas of the entire Indian region covering $4$ latitudes and $4$ longitudes are included in the site description map. The scale of the map was kept at $1: 10, 00,000.$