Topographical Sheets — Geography STD 11 Arts — Question
Gujarat BoardEnglish MediumSTD 11 ArtsGeographyTopographical Sheets3 Marks
Question
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.
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