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What is LTBP? Overview Participants Regional Offices  Features: Calendar Photo Gallery Publications  Programmes: Biodiversity Environmental Edu. Fishing Practices Geogr. Info. Syst.   Help Desk   LARST   Newsletter   Metadata   Participants   Publications Pollution Sedimentation Socio-economics Training  Processes: Legal Convention Strat. Action Prog.  Management: Reg. Co-ordination  Projects: Nyanza Course Uvira Renovations World Environ. Day  Administration:  Project Resources			GIS Help Desk Choose Data Format? -------- Metadata -------- Ways to Present the Data -------- Image Data -------- Data Georeferencing -------- Raster Data -------- Map Data -------- Tabular Data -------- Nonspatial Tabular Data 4. Georeferencing Your Data : All image and GRID must be georeferenced. If your image is not georeferenced you must provide us the following parameters : -Dimension of the pixel of the map (i.e. x resolution eg.1000) -Dimension of the pixel of the map -x map co-ordinates of the centre of the upper-left pixel -y map co-ordinates of the centre of the upper-left pixel To find the dimension of a pixel : - Divide the total width of your image by the total number of pixels in the x direction to calculate the x dimension of a pixel - Divide the total height of your image by the total number of pixels in the y direction to calculate the y dimension of a pixel Example : If you have a GRID in UTM, with a size of pixel 1km2 which cover the area of 717 532.27----------857 437.33 m in x direction 9 749 296.48-------9 628 361.6 m in y direction Your parameters will be 1000.00000000 x resolution of 1000 m -1000.00000000 y resolution of 1000 m 717 532.27000000 x co-ordinate of the centre of the upper-left pixel 9 749 296.48000000 y co-ordinate of the centre of the upper-left pixel
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