Datamine Discover KB - Map Window

How do I calculate the bearing of a line?

kbadmin — Mon, 26 Feb 2024 04:31:28 GMT

Occurrence

The MapInfo Ruler tool does not give a bearing angle!

How do I calculate the bearing of a line, or between two points?

Solution

To calculate a bearing interactively with a ruler tool, use Discover's

QUERY>Map Object>Location Info

Or to calculate a selected lines bearing and saved in as a attribute use -

QUERY>Map Object>Line Orientation

These 2 Discover tools both create a line Bearing, clockwise from North.

If you have MapInfo MapCAD Loaded, this adds a tool under -

SPATIAL>Calculate>Calculate Direction

This is incorrect. It calculates a mathematical standard cartesian angle, which is counter clockwise from the right hand direction (East).

To convert this into a GIS bearing, which is clockwise from North (top of map) you need to apply the following -

degResult = 90.0 - mathBasedDeg;

if (degResult < 0)

degResult += 360;

if (degResult > 360)

degResult -= 360;

I am unable to save an ECW from the Convert Map to registered raster tool

kbadmin — Tue, 26 Jul 2016 00:38:05 GMT

Occurrence

In Discover 2015.0 or 2015.0.1 32bit, in the Convert Map to Registered Raster tool when I select ECW output, I receive the error "Unable to load ECWCompressor.dll".

Solution

Download and unzip the�attached file, and then copy it into your Discover install direcotry -
C:\Program Files (x86)\Encom\Discover

How to set the default view for a table when it is first opened into a new map window

Josh Knight — Fri, 30 Oct 2009 03:50:13 GMT

Occurrence

Do you find it frustrating that whenever you open up a particular table into MapInfo it is zoomed in
on a portion of the data and you find you have to use View Entire Layer to see the entire dataset
everytime? Alternatively, do you open up very large datasets which take a long time to re-draw only
to then zoom into an area of interest? This is because MapInfo stores a default view for a table
when it is initially opened into a map window. The Discover software contains a menu option that
enables you to change the original data view displayed when a table is initially opened into a new
map window.

Solution

1. Open the table for which you wish to change the default view and display in a map window.

2. Position the table in the map window with the view you would like to see when the table is first opened.

This may involve changing the view to display the entire dataset or just zooming into an area of interest.