The coordinate system of the Egyptian ETM

 The coordinate system of the Egyptian ETM

Coordinate system consists of three maps Egyptian zones Zones are commonly called as the (Belts Belts). Geodetic Reference Geodetic Datum maps used in the Egyptian General Authority for space is a global reference Helmert 1906 Helmert 1906 EllipsoidAnd projection system maps used in Egypt called the system Mirkator browser Egyptian Egyptian Transverse Macerator usually symbolized by the ETM simply as a special version of the global system Mirkator browser but with special elements in Egypt.And change the values ​​of these elements with each belt (area) of the Egyptian maps as follows : 1 - Red Belt Red Belt: This belt covers the central region of Egypt and that of longitude 29 east to longitude 33 east. The values ​​are the elements of the system ETM in this belt are: False Easting = 615 000 m east supposed CoordinateFalse Northing = 810 000 m coordinates of the northern supposedLatitude = 30 latitudeLongitude = 31 LongitudeScale on central Meridian = 1.00 coefficient scaleZone width = 4 degree Viewing Area2 - Blue Belt Blue Belt: This belt covers the eastern region of Egypt and that of longitude 33 east to longitude 37 east. The values ​​are the elements of the system ETM in this belt are: False Easting = 300 000 m east supposed CoordinateFalse Northing = 110 000 m coordinates of the northern supposedLatitude = 30 degree latitudeLongitude = 35 degree LongitudeScale on central Meridian = 1.00 coefficient scaleZone width = 4 degree Viewing Area3 - Purple Belt Purple Belt: This belt covers the western region in Egypt and that of longitude 25 east to longitude 29 east. The values ​​are the elements of the system ETM in this belt are: False Easting = 700 000 m east supposed CoordinateCoordinate the northern supposed False Northing = 200 000 mLatitude = 30 degree latitudeLongitude = 27 degree LongitudeScale on central Meridian = 1.00 coefficient scaleZone width = 4 degree Viewing Area (B) coordinate system developed Egyptian MTMDue to the widespread use of GPS technology in the surveying business in Egypt has announced that the Egyptian General Authority for the area several years ago for the development of a new system of coordinates used in the Egyptian maps and knew the name of the system: the system browser Mericator average Modified Transverse Macerator or simply as MTMLaunched or announced since 1995 with the completion of the creation of the new Egyptian Geodetic Reference-based GPS (network HARN) MTM system will depend on the WGS84 geodetic reference and not like the former regime in 1906 HlmertLike the previous regime will be using the system for the type of MTM projection maps of type Mericator browser, but will be divided into five segments Egypt (not only 3 in the former regime ). There are several common elements among the five slides as follows: False Easting = 300 000 m east supposed CoordinateFalse Northing = 0 m coordinates of the northern supposedLatitude = 0 degree latitudeScale on central Meridian = 0.9999 coefficient scaleZone width = 3 degree Viewing AreaThe only value that changes from one slide to another Longitude are as follows: Slide 1: Longitude = 25 30Slide 2: Longitude = 28 30Slide 3: Longitude = 31 30Slide 4: Longitude = 34 30Slide 5: Longitude = 37