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44. It would also be pertinent to mention here that as per the CRZ Notification- 1991, the area within 500 mtrs. of the highest tide line is called as CRZ area, which needs to be located based on field visit for assessing the line, up to which the sea water must have reached in the past. Besides that the vegetation, soil cover and other relevant factors are also taken into consideration in its determination, as such it requires expertise because of which the MoEF has authorized specific agencies having expertise to determine the HTL. For drawing HTL using Global Positioning System (GPS)/Latitude and Longitude of various points are located at 25/50 meter intervals. This data is then transferred to toposheets (for CZMP) of 1:25000 scale or cadastral maps (for CRZ clearance) of 1:4000 scale. Hence, such work can also be joint effort on the part of NIO and DSLR, but the NIO will be responsible for providing latitude and longitude of various points defining HTL, whereas DSLR will be responsible for plotting HTL line on revenue map by converting latitude and longitude into Cartesian co-ordinates. Adopting this procedure, the map appears to have been prepared by DSLR with the help of NIO, which is annexed with the impugned order dated 09.07.2018 of respondent No.1/GCZMA showing with yellow colour Building "A", which is found to lie within 500 mtrs. of HTL under CRZ area. In this map, by green colour, a straight line of 500 mtrs. has been drawn and to the west of it is shown the property in question.