فارسي | English
  About Us | About Iran | Contact Us | Staff Info[Geoportal Info] [Maps] [Mining Info] [Other Activities]  
 
  News | Events | Photo Gallery | Downloads | Links | Kids  Search    Region    Scale    Subject   :Access to information by   Home | Newest   
 


 
 
Comment
 
   Notes about the uncertainties of geographic coordinate system of Magnetic Lineament Map
 
Geographic coordinate system of 2500 K Magnetic Lineament Map of Iran is unknown and despite of attempts of Committee for Codifying Geological Map Data Model, this problem didn’t solved until preparation of map in GIS area.
   So, after digitization of features, for translation of map to correct coordinate, a geographical coordinate system relevant to the map was created and transformed to basal projection system of 1000 K maps. Based on headings of map’s data model, rubbersheet operation of 9 points into correct coordinate was done. But, because of problem in distance between geographical latitudes and longitudes in paper map, some controlling points didn’t have an acceptable match with basal coordinate system. This mismatching distance in the paper map was between –1 to +1 millimeters (in 2500 K Scale) that it subdivides unsystematically in 58 points.
   At second step, the operation was done with 52 controlling points. This operation derived a better result for sympathy of features but not at all.
   In the next step, the points increased to 92, but deviation and undulating of map did not decreased significantly and some new irregularities were occurred because of points with incorrect coordinate.
   Ultimately, the committee selected the 52 points rubbersheet map as the best choice.
   Committee for Codifying Geological Map Data Model
   27/10/2003
 
 
 
Publications  Library
Glossary  Papers
 
 
 
 
FAQ  Members
Job Offer  Training
 
 
 
 
• Medical Geology Database 
• Geological Atlas of Roads 
• Marine Geology 
• Geography information 
• Mines and Deposits of Iran 
• Land Geophysics Database- Iran 
• Landslide Database of Iran 
• Exploration Area DB 
• Copper Database 
• Gold Database  
• Geoscience Laboratories 
• Mineral Information 
• Bibliographic Database 
• Geochemistry Database 
• Earthquake database 
• Abandoned mines DB of Iran 
• Mineral processing database 
• Minerals database 
 
 
 
 
Login Name:
Password:
Sign Up for membership ]
 
 
 
   Others Activities:• Geo Hazard Of South Caspian • Geoscience database of ALBA • Geoscience Database of ECO 
• GEOLOGICAL SURVEY OF IRAN • Tajikistan Geoscience Database • Geo Database of Venezuela • 4th National Development Plan 
• Export & Import Regulation Act     
 
 
Maps:• Map of Iran's Earthquake • Distribution Map of mineral Processing Plants 
• Mineral Distribution Map of Iran • Geosciences laboratories distribution map of Iran • Orohydrographic Map of Iran 
• Select state on iran map • Geological Map of Iran(1:1000, 000 Scale) • 2500 K Magnetic Lineament Map of Iran 
    
 
Best viewed:1024*768
National Geoscience Database Of IRAN
URL:www.ngdir.ir
Contact Mail:Info@ngdir.ir
 
 
 Search with:           
Designed by Payvand Software Group  Privacy | Copyright | Disclaimer