Need to digitize mineral and geological state maps of India, where the coastline does not match with the one I have. I guess it is a projection problem. All our maps are in WGS-84 geographic cordinates.
Hi,
there is a predefined Lambert Conformal Conic projection in ArcGIS for each continent. For Asia its:
Asia_Lambert_Conformal_Conic
Projection: Lambert_Conformal_Conic
False_Easting: 0,0
False_Northing: 0,0
Central_Meridian: 105,0
Standard_Parallel_1: 30,0
Standard_Parallel_2: 62,0
Latitude_Of_Origin: 0,0
Linear Unit: Meter (1,0)
Geographic Coordinate System: GCS_WGS_1984
Angular Unit: Degree (0,0174532925199433)
Prime Meridian: Greenwich (0,0)
Datum: D_WGS_1984
Spheroid: WGS_1984
Semimajor Axis: 6378137,0
Semiminor Axis: 6356752,314245179
Inverse Flattening: 298,257223563
Good luck
Do the Survey of India maps come with a PRJ file when you download them? This file would contain the projection. Alternatively, do the Survey maps come with metadata files? Those files would contain projection data as well.
Maybe you are georeferencing (digitizing) paper maps from PDFs? If so, you can perform transformations to get it close. Finally, you can always contact the Survey and ask for help. Good luck.
Hi,
If your maps are in digital files that can store geographical information (like “geotiff” format) you can find projection information in the header (footer) of these files. You can also look for the metadata files that contain information about the projection system of your files.
So, if you have two files that show the same region but they are not spatially correlated (do not match spatially), you must apply an image registration (for the one image file to the other).
If your maps are just scanned files you have to georeference them. It is a common procedure included in the most of the GIS or the remote sensing software packages. If you are not familiar with these procedures use as key words “georefeence” and “image registration” in the user guide of a relative software.
There are also many tutorial videos available on the web like the following:
https://www.youtube.com/watch?v=Cb_qrNh_6_Q
Good luck
Thank you everybody. My maps are paper maps, scanned. I know the process of digitizing in ArcGIS. My query is what would be the projection system for the SOI toposheets. If I remember correctly, SOI uses Lambert Conformal Conic projection. In ArcGIS that is not a set projection system, so one need to customize an existing projection or create from scratch. my requirement is the parameters/steps for preparing that projection.
Hi,
there is a predefined Lambert Conformal Conic projection in ArcGIS for each continent. For Asia its:
Asia_Lambert_Conformal_Conic
Projection: Lambert_Conformal_Conic
False_Easting: 0,0
False_Northing: 0,0
Central_Meridian: 105,0
Standard_Parallel_1: 30,0
Standard_Parallel_2: 62,0
Latitude_Of_Origin: 0,0
Linear Unit: Meter (1,0)
Geographic Coordinate System: GCS_WGS_1984
Angular Unit: Degree (0,0174532925199433)
Prime Meridian: Greenwich (0,0)
Datum: D_WGS_1984
Spheroid: WGS_1984
Semimajor Axis: 6378137,0
Semiminor Axis: 6356752,314245179
Inverse Flattening: 298,257223563
Good luck
I think the Indian Survey map based on British National Grid System it was developed in 1934. if the map scale is 1:50,000 it should be on Conformal Conical projection using the Everest/Indian75 Datum. if the map is on 1:500,000 it should be on International Poly conical system it is double standard parallel. you can see the map information which is available on map.
First you convert into digital format if it is on paper map (use the high Resolutionscanner)
second Geo-referencing the map in ERDAS imaging or any image processing software and select the best suitable projection system according the given information on map.
after finished the Geo-referencing process save it to tif or img format
final just add into ArcGIS or ArcMap
Enjoy!
The SOI toposheets hard copy maps are prepared previously on projected Polyconic projection system and Everest india nepal datum. Now a days SOI are providing digital maps having projection system Lamberts conformal conic and WGS 84 datum. In arc gis you will have the option for all projection system. But according to my knowledge if you will registered the old maps of SOI with another projection system you will not get the accuracy due to different projection parameters.
i have a similar problem, i have toposheets of katakana and i wanted to georeference it., i tried doing in Qgis and arcgis both by adding GCP points.but its having a large shift.
i am not able to rectify it . please help me in this.
Standard projection used by National Remote Sensing Centre (NRSC), Hyderabad and ISRO as follows:
Projection: Lambert Conformal Conic
Linear Unit: Meter
False Easting: 4000000
False Northing:4000000
Central Meridian: 80
Standard Parallel 1: 35.172805555556
Standard Parallel 2: 12.472944444
Latitude of Origin: 24
Datum: WGS 1984
Source:http://swat.tamu.edu/docs/swat/india-dataset/2012/Data_sources.txt
Please send me PARAMETERS OF Polyconic projection system and Everest india nepal datum for india if any one has it.
Hi Friends, sorry for posting irrelevant topic in the discussion. I'm looking for Krishna district SOI toposheet map. SOI are not responding to mails. where can i get them and how. please help me out.
reach me at [email protected]
Toposheets are freely downloadable here at 1:250K Scale
http://www.lib.utexas.edu/maps/ams/india/
Refer the projection system written on the survey of India toposheet at the bottom. If you have downloaded new open series toposheet then it has Projection: UTM, Datum: WGS 84. New series can freely be downloaed from http://www.soinakshe.uk.gov.in/
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