Remerciez-le!

Remerciez @Admin pour avoir partagé cet document gratuitement, de la manière la plus simple, en partageant sur les réseaux sociaux.

Guide prjector G Projector User's Guide Updated July G Projector is a tool for exploring map projections It takes an input map image typically in Equirectangular form also called Cylindrical Equidistant or Plate Carré and transforms it to one of over othe

G Projector User's Guide Updated July G Projector is a tool for exploring map projections It takes an input map image typically in Equirectangular form also called Cylindrical Equidistant or Plate Carré and transforms it to one of over other projections Additionally outlines and or symbols can be drawn overlaying the projected map image Input Map Images When you ?rst start G Projector you are presented with a ?le dialog asking you to select a source input map The bitmapped image formats that you can use include BMP GIF JPG and PNG On some platforms you may also be able to open TIFF images Furthermore you can open ground overlay images that are identi ?ed within many OpenGIS KML and KMZ ?les What other constraints are there on your choice First you don't have to select an input map at this time You could click the cancel button in the ?le dialog and just work on a map projection window that shows only a longitude-latitude grid and continental outlines At some later time you could then import a map image If you select a bitmapped input map image at the start the image must be of a map projection that G Projector is able to readand use for input After the image ?le has been selected a dialog will appear like that in Fig asking you to identify what the input projection is and to specify any parameter values needed to interpret that projection Figure The input map options dialog shown for an Equirectangular map projection Although G Projector is capable of creating maps in projections it is currently only able to use just six map projections for input In addition to the standard Equirectangular form it can also work with a Aito ? Cylindrical Equal-Area Hammer Robinson or Winkel Tripel input map image Please note that implementations of the Robinson vary so G Projector may not handle any particular input Robinson map as well as one would like Whatever the input image's map projection it should have no border or extra margins around the edges If you instead select a KML or KMZ ?le to use as input G Projector will parse the information in the ?le that identi ?es the input image by looking for the GroundOverlay tag The longitude and latitude bounds of the image are also obtained from this tag But please note that G Projector does not understand rotated ground overlay images The G Projector distribution includes a folder called sample maps that contains four sample input maps two global map images of Earth and one of Mars plus a KMZ ?le that includes a topographic image of just the United States These are relatively small image ?les the largest being ? pixels and size about kB The maximum image size that G Projector will accept for input is dependent on the amount of memory on your computer If you use larger input images ?? maps ? pixels or larger ?? from other sources please