How to define SOP projection inSpectra Precision / Trimble Geomatics office Software







How to define SOP projection in
Spectra Precision / Trimble Geomatics office Software




Step-1
From the All Programs, click on Coordinate System Manager under Spectra precision Survey Office/Utilities folder




Coordinate System Manager window will be opened.


Under the Ellipsoids tab, click on Everest 1956 ellipsoid to view its properties.



Make sure that the semi major axis and semi minor axis has following values.

Semi Major Axis (a) = 6377301.243 m
Semi Minor Axis (b) = 6356100.228 m

Click on OK.

Step-2

Click on Datum Transformation tab.

 


Datum transformations are partitioned in two panels. The left panel contains the predefined datum transformations. The right panel describes the method of transformation. There are three methods.
1. Molodensky

This method involves the Molodensky transformation using three translation vectors dX, dY and dZ between WGS84 ellipsoid and any other ellipsoid.
2. Seven Parameter

This method involves the Helmert seven parameter transformation using seven parameters dX, dY, dZ, Rx, Ry, Rz and scale factor between WGS84 ellipsoid and any other ellipsoid. dX, dY and dZ are treated as same as Molodensky while Rx, Ry, Rz are roations between two ellipsoids along X-axis, Y-axis and Z-axis respectively. The scale is the ratio of dist….
3. Multiple Regression


The transformation in our case is Molodensky transformation so we need only dX, dY and dZ parameters whose values will be used as under:

dX = 283
dY = 682
dZ = 231

Right click on the right pane and click on Add New Datum Transformation and click on Molodensky




Datum transformation properties window will be displayed.





Set the properties as :
Name: SOP
Export Name: SOP_Trans
Ellipsoid: Everest 1956 (select from the list)
Translation X (m): 283
Translation Y (m): 682
Translation Z (m): 231

Make sure To WGS-84 radio button is selected.

Press OK to close the Datum Transformation Properties window.

A new blue icon will be shown in datum transformation list.







Step-3

Select the Coordinate System tab.



This window is also partitioned in two panels. Right click on the left panel and click on Add New Coordinate System Group.




Give the Name and Export Name as SOP_Pakistan.




A new folder will appear as SOP_Pakistan (Cyan in color).
Select SOP_Pakistan and right click and select Add New Coordinate System.



A sub menu containing different projections will appear. Select Lambert Conformal Conic Parallel 1 ….




In the Zone Parameter Window,  Set the Name and Export Name as SOP_1SP_North. Select the datum from the list. In our case, select SOP (defined in step-2) from the list.



Click the Next button.
Geoid Model window will appear.



Select any geoid model from the list. In our case, select EGM96 (Global).
Click Next.
The projection window will appear.



Set the projection properties as below:



Click Next.

Shift grid window will appear.
Set Shift grid name as none.
Click OK.
Save current.csd file by clicking on save button.



Comments

  1. Anonymous25 February 2014 at 14:11

    For Everest 1956 Ellipsoid having Semi Major Axis (a) = 6377301.243 m and Semi Minor Axis (b) = 6356100.228 m
    You are using following Transformation Parameters
    Translation X (m): 283
    Translation Y (m): 682
    Translation Z (m): 231.

    But are not these parameters for Ellipsoid with Semi Major Axis (a) 6377309.613 and Inverse Flattening: 300.8017255?
    ?

    ReplyDelete
    Replies
    1. Imran Anees25 February 2014 at 22:07

      Dear Salman
      Refer the following link to see the published parameters for the SOP datum based on Kalianpur 1962 datum.

      http://georepository.com/transformation_1247/Kalianpur-1962-to-WGS-84-1.html

      I am compiling an other article to write more about historic records about the different versions of Everest ellipsoid.
      Hope this will help you.
      Thanks for your comments.

      Delete

Post a Comment

Popular posts from this blog

SpaTools: Import Lidar Point Cloud (LAS/LAZ) files into AutoCAD

Image
Point clouds are large data sets composed of 3D point data. These geographic point data is collected mostly by Laser scanners and drones equipped with LIDAR (Light Detection And Ranging) sensors. In addition to these directly collected LIDAR point cloud data, the aerial RGB images collected by drones are processed using Image Processing & Computer Vision Algorithm based software such as Pix4D, Agisoft Photoscan or DroneDeploy to produce RGB Point Clouds in LAS file format. Besides that, the well known image processing software such as ERDAS Imagine Leica Photogrammetry Suite (LPS), ENVI and PCI Geomatica produce output in LAS file format when stereo/tri-stereo satellite images (WorldView-2, WorldView-3, SOPT 5/6/7 & Pleiades) are processed.     LAS is an industry standard file format defined by the American Society of Photogrammetry and Remote Sensing (ASPRS) that includes a system of point classification. A processed LAS file may have points classified as bar...
Read more

How to Clip objects in AutoCAD

Image
There is a tool named as CLIP in ArcGIS which cut out a piece of one feature class using one or more of the features in another feature class as a cookie cutter. This is particularly useful for creating a new feature class as study area or area of interest (AOI) that contains a geographic subset of the features in another, larger feature class. It is often needed to CLIP all the objects contained completely inside a polygon to a new drawing. The type of the objects may vary from simple objects like polylines, lines, circles, text to complex objects like splines, arcs, hatches, blocks etc. Since the release of AutoCAD 2008, a new command EXPORTLAYOUT was introduced to export all the objects in all the viewports of the layout to a separate drawing. I am writing this article because most of the CAD users are not aware about the power of this magical command of Autocad and use TRIM command to trim all the objects one by one which are outside of the desired polygon. It is h...
Read more

SpaTools: Extract Topographic Profile From Contours In AutoCAD

Image
A topographic map is simply the two dimensional representation of a portion of three dimensional surface of earth. Topographic maps provide the detailed information about the natural and man-made aspects of the terrain, but are best known for their series of contour lines that show elevation changes, and colors signifying varying land types and bodies of water. Contour lines are used to determine elevations and are lines on a map that are produced from connecting points of equal elevation (elevation refers to height in feet, or meters, above sea level). By reading contour lines, one can measure the steepness of a hill, the height of a mountain, and even the depth of a lake or Ocean . The contours can be generated by a DEM (Digital Elevation Model), TIN (Triangular Irregular Network) or a surface using different software such as ArcGIS.  Read the blog about How to generate contours from DEM and create a topographic map in Autocad. Most of the topographic maps used for p...
Read more

Gunter Chain / Surveyor's Chain

Image
“ What is the length of cricket pitch?”  “It is equal to 22 yards”. Cricket  is a bat-and-ball game played between two teams of eleven players on a field at the center of which is a 22 yard pitch with a wicket at each end, each comprising two bails balanced on three stumps.  Recalling the memories of childhood, we use to place the wickets by pacing out a distance of 22 paces by walking. At that time, we were not aware neither interested to know the exact length of cricket pitch. But this time, the question raised in my mind that why it is 22 yards!! ?? Why it is not like 22 meters or 25 yards or 20 yards? Cricket Pitch The standard length of cricket pitch is simply one Gunter chain (Surveyor’s chain) since the first known code of Laws in 1744 and it is believed this length had been in use since the introduction of Gunter's chain  in 1620 . Throughout recorded history surveyors have used ...
Read more

Creating Contour Maps in ArcGIS and Conversion to AutoCAD drawing

Image
A topographic map is simply the two dimensional representation of a portion of three dimensional surface of earth. Topographic maps provide the detailed information about the natural and man-made aspects of the terrain, but are best known for their series of contour lines that show elevation changes, and colors signifying varying land types and bodies of water. Contour lines are used to determine elevations and are lines on a map that are produced from connecting points of equal elevation (elevation refers to height in feet, or meters, above sea level). By reading contour lines, one can measure the steepness of a hill, the height of a mountain, and even the depth of a lake or ocean . These lines are evenly spaced apart. This spacing is called the contour interval. For example, if your map uses a 10-foot contour interval, you will see contour lines for every 10 feet (3 meters) of elevation -- lines at 0, 10, 20, 30, 40, and so on. Different maps use different intervals, dependin...
Read more

Analyzing the BUG in IntersectWith() - AutoCAD .Net API

Image
One of the common tasks while solving geometric problems in CAD environment is to find the intersection of two geometric entities such as Lines, Polylines, Polygons (Closed Polyline in CAD), Circle, Ellipse, Regions etc. Natural problems exist where a solution may solely depend upon the intersection and the count of intersections. A practical example where intersection of geometric entities matters is Cutting a polygon into two parts. Another fundamental problem in computational geometry, CAD, GIS, motion planning and Computer Vision is to detect whether a given point lies inside or outside the given polygon or plane. The simple solution to this problem is to test how many times a ray starting from the given point extends towards the edges of a polygon. An even number of intersections implies that the point is outside of the polygon and vice versa. Intersections are sometimes also referred when testing to detect overlap of two polygons. In such a case, the region of intersecti...
Read more