Numbering System of Indian SOI Topographical Sheets.pdf

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1. Numbering System of Indian SOI Topographical Sheets
PG Diploma in RS & GIS
Semester: II
PAPER: Computer Cartography (GIS: 08)
Dr. SHYAMA PRASAD MUKHERJEE UNIVERSITY , RANCHI

2. STUDY OF
TOPOGRAPHIC MAPS
2

3. POINTS OF DISCUSSION
3
✓DifferenttypeofMaps
✓WhoPreparesMaps
✓WhousestheseMaps
✓InformationavailableonToposheets
✓ScalesofMaps
✓Gridsystem,Numberingofsheets
✓Howtolocatesheetforaparticulararea
✓Howtoknowfeaturesofthearea
✓FromWheretoprocure

4. MAPS
4
•Mapsisvisualrepresentationofdata
•Mapsareindispensabletoolsinstudyofgeography.
•VarioustypeofMapsareusedfordifferentpurposes
•Dependingonrequirementmapsaredrawnonsmallorlargescale
•Surfaceofearthismadeupoflargenumberoffeaturessuchasmountains,plains,rivers,lakes,oceans,etc.
•Thesefeaturesarerepresentedbyspecificsymbols,signsandcolours

5. MAP ON GLOBE
5

6. POLITICAL MAP
6

7. ROAD AND RAIL MAP
7

8. TOPOGRAPHICAL MAPS
8
•Mapswhichrepresentasymbolicorconventionalpictureofthephysicalandcultural
landscapeofsmallareaonverylargescaleareknownasTopographicalmapsortopo
sheets.
•Thesemapsarebasedonactualsurveyofthearea.
•Thescaleofthemapsislargeenoughtoshowthephysicalandculturalfeaturesindetail.
•Thesefeaturesarerepresentedbyspecificsymbols,signsandcolours
•Toposheetsareavailableonscaleof1:250000and1:50000&1:25000

9. TOPO SHEET
9

10. TOPOGRAPHICAL MAPS
10
‘Topographicsheet'containinformationaboutanarealikeroads,railways,settlements,canals,rivers,electricpoles,
contours/levelsandimportantlandmarksetc.Accordingtotheirusage,theyareavailableatdifferentscales(e.g.
1:250000,1:50000and1:25000etc,wheretheformerisasmallscaleascomparedtothelatter).Theyaremadeona
suitableprojectionforthatareaandcontainlat-longinformationatthecorners.Thusanypointonitcanbeidentified
withitscorrespondinglat-long,dependinguponthescale(i.e.ifthescaleislarge,moreaccuratelat-long).

11. WHO PREPARE TOPOGRAPHICAL MAPS
11
‘SurveyofIndia,TheNationalSurveyandMappingOrganizationofthecountryundertheDepartmentofScience&
Technology,istheOLDESTSCIENTIFICDEPARTMENTOFTHEGOVT.OFINDIA.Itwassetupin1767
Initsassignedroleasthenation'sPrincipalMappingAgency,SurveyofIndiabearsaspecialresponsibilitytoensurethat
thecountry'sdomainisexploredandmappedsuitably,providebasemapsforexpeditiousandintegrateddevelopment
andensurethatallresourcescontributewiththeirfullmeasuretotheprogress,prosperityandsecurityofourcountrynow
andforgenerationstocome.

12. INFORMATION ON TOPOGRAPHICAL MAPS
12
•NameofStateandDistrict
•LocationintermsoflatitudeandLongitude
•Scale
•Magneticdeclination
•Conventionalsigns
•Dateofissueandrevisionoftoposheet.
•Typeoflandformssuchasgeneralslope,hills,valleysetc.
•Drainage–Importantriversandtributaries,drainagepattern
•Vegetation–Typeofforestandtypeoftreesandtheirdistribution.

13. 13
INFORMATION ON TOPOGRAPHICAL MAPS
•Forestlocationandareacovered
•Wildlifesanctuariesandareacovered
•LandUsecultivatedland,wastelandandotheruses
•Meansofirrigation–Canal,wellsandtanksetc
•Communication–Railway,roadways,Bridges,carttrack,Telephonelines,
Transmissionlines,airport,seaportetc.
•Settlement–Urbancenters,theirsizes,ruralsettlementtheirpattern

14. 14
USES OF TOPOGRAPHIC MAPS
•Astudentofgeographystudiesphysicalandculturallandscapeofarea.
•Atraveleroratouristtriestofindoutlocationsandplanshistour
accordingly.
•Aplanner/engineerstudiesnaturalandculturalresourcesbeforeplanning
fordevelopmentproject.
•Amilitarygeneralmayrequireittochalkouthisstrategyofdefenseor
aggression.

15. LATITUDE & LONGITUDE
15

16. Characteristics of Different Scales SOI Toposheet

17. TOPO SHEET GRID
17

18. MILLION SHEET MAP
✓Forthepurposeofaninteractionseries(within40Nto400Nlatitudeand440Eto1240E)
atthescaleoaf1:1,000,000isconsideredasabasemapandthismapiscalledmillionsheet
map.
✓Themillionsheetmapwhichscalebeing1:10,00,000(1cmto10km)or1:Meachcovering
40oflongitudeandlatitude.
✓ThenumberingofsheetsinIndiaisbasedonthenumbersystemofmapsofindiaandthese
seriesbearsthenumberslike1,2,3,4…upto136consistingofthesegmentsthatcoveronly
landarea.
✓these136suchsheetscoverIndiaandadjacentcountriesandthesenumbersareknownas
indexnumberofthearea.
✓Forexample,sheetnumber73isconsiderforJharkhandarea.

19. TOPO SHEET GRID

21. TOPO SHEET GRID

22. TOPO SHEET GRID

23. TOPO SHEET GRID 1:250,000

24. TOPO SHEET GRID
24

25. TOPO SHEET GRID
25
1Deg x 1Deg
15 Min x 15 Min
4Degx4Deg

26. TOPOGRAPHICAL MAPS SCALE 1:250000
26
53
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Each sheet cover area equal to 1degree x 1degree

27. TOPOGRAPHICAL MAPS SCALE 1:50000
27
53H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Each sheet cover area equal to 15 Minutes x 15 Minutes

28. TOPO SHEET GRID
28
28N/76E
53H2/3
32N/76E
28N/80E
32N/80E
28.30-28.45 N
77.00-77.15 E

32. Characteristics of Different Scales SOI Toposheet

33. TOPO SHEET GRID
✓Forthepurposeofaninteractionseries(within40Nto400Nlatitudeand440Eto1240E)at
thescaleoaf1:1,000,000isconsideredasabasemapandthismapiscalledmillionsheet
map.Themillionsheetmapwhichscalebeing1:10,00,000(1cmto10km)or1:Meach
covering40oflongitudeandlatitude.ThenumberingofsheetsinIndiaisbasedonthenumber
systemofmapsofindiaandtheseseriesbearsthenumberslike1,2,3,4…upto136consisting
ofthesegmentsthatcoveronlylandarea.these136suchsheetscoverIndiaandadjacent
countriesandthesenumbersareknownasindexnumberofthearea.
✓Forexample,sheetnumber79isconsiderforfurtherdiscussion.Itsextensionisfrom240Nto
280Nandfrom900Eto940E.
✓Themillionsheethasbeensubdividedinto16sections(4rowand4column),eachof10latitude
x10longitudeandeachpartisnumberedwithblockcapitalletterofEnglishalphabetAtoP.
thesectionsstartfromNorthWestdirections,runcolumnwiseandendinSouthEastdirection.

34. ✓Astheextensionofeachsectionis10latitudeand10longitudethescaleofthissheetis1inch
to4milesor1:250,000.Thenumberingofoneothesheetis79Nanditsextensionisfrom
260Nto270Nandfrom93DegreeEto94DegreeE.
✓The10x10sheetsarefurthersubdividedintofourpartswhichisknownashalfinchsheet,
eachof30/latitudeand30/longitudeandthescaleis1inchto2milesor1:125,000.
theseareidentifiedwiththehelpofcardinaldirectionNE,NW,SE,andSW.letustakethe
figurenumber3.Itisextendedbetween26030/Nto270Nandfrom93030/Eto940E.
✓The10x10sheetscanalsodividedinto16equalpartorsections,numberingfrom1to16in
acolumnandeachof15/latitudeand15/longitude.Eachpartwillhaveascale1inchtoa
mileor1:63360or1:50,000.

35. ✓Thisisalsoknownas30/x30/(Scale1:100,000)oneinchmapandthisisthemostcommon
typeofmapproducedbySurveyofIndia.theextensionofthesheetis79N/14andisfrom
24030/Nto250Nand93015/Eto940E.
✓The1inchsheet(15/x15/)canbedividedinto4sheets.Eachof7(1/2)/andare
numberedasNE,NW,SE,andSW.thescaleofthissheetis1:25,000or1inchto½mile.This
sheetsarenotverymuchcommoninuse.

36. SOME FACTS
36
•Circumference of Earth is 40000Kms app.
•Circumference is divided in to 360degree by imaginary lines
•When we move North –South or East West distance
travelled at Equator is :
•Distance Per Degree = 111 Km
•Distance per Minute = 1.85 Km
•Distance per Second = 30.83 Meter

37. TOPO SHEET READING
37

38. TOPO SHEET READING
38

39. TOPO SHEET READING
39

40. TOPO SHEET READING
40

41. TOPO SHEET READING
41

42. TOPO SHEET READING
42

43. TOPO SHEET READING
43

44. 44
WHERE TO PROCUREMENT TOPOGRAPHIC MAPS
•TopographicmapsortoposheetscanbeprocuredfromSurveyofIndiaofficeHathiBadkalaEstateDehradun.
ContactNo0135-2747051-56
•TopographicmapsarealsoavailableatRegionalofficesofSurveyofIndialocatedindifferentstates.
•Therearetwocategoriesoftoposheets
a.Restrictedtoposheets:Coveringborderareaorothersensitiveareacanbeprocuredwiththeapprovalfrom
respectiveministry.
b.Unrestrictedtoposheets:Thesesheetscanbeprocureddirectlyfromavailablesource.
c.ToposheetsareavailableatnominalcostofRs.35to75only.

45. 45
AVAILABILTY OF TOPOGRAPHIC MAPS IN NTPC
✓NPGGroupunderEngineeringServicesiscustodianofToposheetsavailableinengineeringandcaterto
requirementofalltheengineeringgroups.
✓Wearehaving3460toposheets.
✓Thesesheetsareissuedontemporarybasisasbooksareissuedinlibrary.

46. 46
CONCLUSION
Wehavelearntthatthetopographicalmaparelargescalemapspreparedtoshowminute
detailsoftheground.i.e.location(longitudeandlatitudeofanylocation),spotheight,
benchmarks,vegetation,landuse,formofsettlement,drainagepatterns,transportnetwork
andcommunicationnetwork.

47. 47

48. 48
FREQUENTLY ASKED QUESTIONS
Q: What is difference between normal geographic map & Topographical (Toposheet) map?
A:Topographical maps or topo sheets represent symbolic or conventional picture of the physical
and cultural landscape of small area on very large scale where as normal geographic map is
on small scale and sufficient features are not indicated.

49. 49
FREQUENTLY ASKED QUESTIONS
Q:Who prepares topographical maps?
A: Survey of India, The National Survey and Mapping Organization of the country under the
Department of Science & Technology, is assigned role as the nation's Principal Mapping Agency,
Survey of India bears a special responsibility to ensure that the country's domain is explored and
mapped suitably,

50. 50
FREQUENTLY ASKED QUESTIONS
Q:How to know the toposheet number of a location?
A:Index map has been divided into horizontal & vertical lines (latitude & Longitude) Each segment
of 4Deg x 4Deg is assigned a number, 1,2,3 etc. This is further divided in to 1Deg x 1Deg and
assigned alphabet A to P. There is further subdivision of 15’ x 15’, These subdivision are numbered
1 to 16. If we know location in latitude & longitude term toposheet number can be located very
easily otherwise we have to locate some important town near to the location indicated on Index
map.

51. 51
FREQUENTLY ASKED QUESTIONS
Q:Can we know the altitude of a particular location on toposheet?
A:Contours are drawn on map, we can know approximate altitude of location
from contour lines.

52. 52
FREQUENTLY ASKED QUESTIONS
Q: What is difference between restricted map and unrestricted map?
A:Restricted toposheets are Covering border area or other sensitive area and can be procured
with the approval from respective ministry whereas unrestricted toposheets can be procured
directly from available source.

53. 53
FREQUENTLY ASKED QUESTIONS
Q: From where the toposheets can be procured?
A: These can be purchased from Survey of India Hathi BadkalaEstate Dehradun Or from any
regional office of Survey of India.