GIS in Windows

GIS maps produced is a projection from the earth surface geometry data with the actual situation in the 2.5 - 3 dimensions into 2-dimensional. Changes in the dimensions of this is done with little distortion, so the results may be achieved is not too much different with the form, distance and the actual area. There are various types of projection from the surface of the earth, roughly spherical flat as a flds cylinder / tube (cylindrical), cone (conical), flat field (zenithal) and composition (arbitrarry). However, the accuracy is close to the projected composition. Projection is obtained through the calculation.

In Indonesia, generally using the projected composition of the WGS-84 (World Geodetic System) and UTM (Universal Transverse Mercator). UTM projection is a projection map, which many in the select and use in the mapping activities in Indonesia because the value of the ideal syarat2 meet with the appropriate form, location and area of Indonesia. UTM projection in the entire surface of the earth is divided over the 60 called by the UTM zone. Each zone is limited by two meridian at 6 ° meridian and have their own midst. For areas of Indonesia is divided into nine zones UTM, starting from the meridian 90 ° with BT to 144 ° with BT limit pararel (latitude) 11 ° to 6 ° LS LU. Thus, starting from the Indonesian region a zone 46 (central meridian 93 ° BT) to zone 54 (central meridian 141 ° BT).