A toposheet is a shortened name for 'Topographic sheet'. they essentially contain information about an area like roads, railways, settlements, canals, rivers, electric poles, post offices etc. According to their usage, they may be available at different scales (e.g. 1:25000, 1: 50000 etc, where the former is a larger scale as compared to the latter). They are made on a suitable projection for that area and contain lat-long information at the corners. Thus any point on it can be identified with its corresponding lat-long, depending upon the scale (i.e. if the scale is large, more accurate lat-long).
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Any one who is having Indian citizenship can get toposhhet from Survey of India's office by paying the Price of that particular toposheet.
toposheet can be studied by the information on the data obtained and the markings,colouring done for a area like canals,roads,railways etc...a study of toposheet is a study of topographic sheet....google for more information
That would depend if you are looking at degrees of latitude or degrees of longitude. One degree of longitude represents less distance nearer the poles than it does at the equator. One degree of latitude represents the same distance anywhere on earth.