QC CalcGIS - Android
The main screen allows either a manual entry of Lat/Lon or E/N in order to convert using the selected Coordinate System (CS) and Projection. Use the button to select the relevant CS & Projection from a list of user defined values.
When the App is initially installed a set of default CS's and Projections are supplied for use, these represent some typical systems. The app only converts Lat/Lon to Grid with Transverse Mercator (TM) and Universal Transverse Mercator (UTM), however datum shifts between WGS84 and any defined CS can be computed.
If the 'Live GPS' switch is selected - as shown here - the position is updated with each GPS position acquired. Status information on the GPS position is provided. If the 'Mean GPS' switch is selected then each fix will be accumulated and a mean position derived, this position can then be saved directly to the Saved Points database on the device.
The Accuracy figure provides a guide and a the lower the better.
If the 'Show on Map' button is clicked then the point GPS updates (or mean) will be shown on the chart and updated with each fix. If the 'Live GPS' is turned off then the position will be the last displayed.
If you click on either the selected CS text i.e. WGS84 in the image shown, the parameters will be displayed.
To access other features select the menu at the top left of the screen and for display settings the one at the top right.
When you select either the 'Edit Coordinate System' or 'Edit Projections' items a list will be provided showing those currently in the device, select one and the details will be displayed and can be edited.
NOTE : When editing the parameters for datum shifts it is ALWAYS the values to convert FROM WGS84, check your signs carefully and ideally have a check fix to hand for comparison.
A typical CS edit screen is shown here for International 1924 ...
Saved points provides a list of points, these many be previous data or points from a traverse, selecting the item from the list allows the user to change the details and show on the map.
NOTE : All points are saved using WGS84, to convert to other CS pass it to the Converter and select the relevant CS for the point (WGS84) and the projection and/or datum shift CS.
To change the point type simply tap on the image and select from the list of point images provided.
Buttons are provided to add a new point and remove the current point.
Below the text data entry panel there is a section where an image from your photo gallery can be attached to the point. When a photo is attached the geo-reference is checked and if available the point name and coordinate can be updated with this info. Using this you can also simply create a new point, select an image from your Gallery and use the geo-reference. This can be handy for asset management when surveying in remote locations. See screenshot right.
When the 'Show Map' button is pressed ALL saved points will be displayed on the map, clicking on an individual marker will provide the name and position information for that point.
You can also select a point from your list and send it to the Coordinate converter by clicking the '-> Converter' button.
click the 'X' to close the editor.
The Point to Point calculation allows the user to select a Projection and any two points from the Saved Points. As they are taken from Saved Points they are always in WGS84.
The result is shown in bearing, distance both grid and true and as slope distance. The line scale factor is shown and the convergence for the first point.
The Quick Traverse routine is handy for ...
Shooting a series of point using a fixed point - set the 'Hold Coord' switch
Traversing from point to point using a range and bearing (select Grid or True)
Traversing orthogonally using X and Y values relative to a heading, e.g. computing an offset when there is no clear line of sight.
Enter a name for your Traverse, the origin coordinate and select the mode True, Grid or X/Y then enter the relevant data and click 'Compute', the list will be updated with the latest computation at the top.
Once computed the point can be displayed on a map, all points in the list are shown. The computed point can also be saved to the Saved points database.
Click the 'Clear List' button to start a new list.