PanGazer logo PanGazer – overlays

Introduction

Download PanGazer


Getting started

General settings

Setting North

Saving views

Saving images

Sharing images

Image geography

Show image location

Overlays

Enhancements

Aspect ratio


Making panoramic images

Keyboard shortcuts

Command line options

The gnomonic projection

Thanks

PanGazer uses ‘status’ text fields to show camera settings, etc. (see the settings page). In addition, it can overlay data on the image that are directly related to the image itself rather than being simply numerical values. Currently two overlays are available:

  • Compass points – if the bearing of the image is known (see setting North), this overlays points of the compass across the top of the view to indicate the direction of view

  • Tilt angles – if the horizon of the image is known, this overlays tilt angle values at the left of the view.

If the bearing or horizon is not known you can set it, as described below.
Here is a view showing both overlays:

PanGazer screenshot showing overlays

PanGazer screenshot showing overlays

Compass points

PanGazer lets you set where North is for any image. Once North is set, by either method described on the Setting North page, PanGazer can show the bearing of the cursor and can also overlay compass points (‘N’, ‘S’, ‘SW’, etc.) at the top of the view to help give a sense of direction – as shown in the screenshot above.

The overlaid compass points will move appropriately as you change viewpoint and zoom. You can turn them off or on by clicking the Settings → Overlays → Show compass points menu item, or toggle the display of all your selected overlay and status displays using the Space Bar.

The view bearing is calculated at the position that the compass points are displayed (near the top of the view rather than at the centre point of the view). This is so the bearings remain static relative to the displayed image as the view is panned left or right.

Tilt angles

The tilt of the image is the vertical angle (pitch) of the centre of the image relative to the horizon (positive is above the horizon) with a range from −90 through +90 degrees. For spherical images the position of the horizon is fixed and is calculated from the geometry of the image (the bottom edge of the image is at −90 degrees). For all other images (360 or not) you can set, edit, or delete the horizon position.

To see the tilt angles, first ensure that Settings → Overlays → Show tilt angles is checked (this is off by default).

As for setting North, there are two ways to set the horizon position:

  1. You can use the Image Geography dialog to set (or delete) the tilt of the centre of the image.

  2. If the horizon is visible in the image, right-click on it and select Set horizon on the pop-up menu; you should then see the tilt angles at the left of the view. If their position is wrong, just try again (or use the Image Geography dialog to adjust or delete the value).

The tilt overlay shows the tilt at the centre point of the view.


Notes:

  1. Once the North point or horizon has been set it will be recorded in the image file (in its Exif metadata, and in XMP metadata too if the image is spherical) if the image is saved (Ctrl-S or Image → Save image as..., etc.). When it is next loaded the bearing and/or horizon of the image is known and compass points and tilt angles will be shown automatically if set to be shown.

  2. Similarly, if you save a view of an image that has its North point and/or horizon set, that saved view will include known geographic settings; see the Saving views page for more details.

  3. In the starter image you’ll see a white electricity pylon close to the −90 point if you pitch down far enough; the base of the pylon is close to True North from the drone position.

PanGazer and these web pages were written by Mike Cowlishaw; Please send me any corrections, suggestions, etc.
All content Copyright © Mike Cowlishaw, 2014–2020, except where marked otherwise. All rights reserved. The pages here, and the PanGazer program, are for non-commercial use only.
Privacy policy: the Speleotrove website records no personal information and sets no ‘cookies’. However, statistics, etc. might be recorded by the web hosting service.

This page was last updated on 2020-01-31 by mfc.