GEOTAG	Detected Value
Orientation
DateTime
PixelXDimension
PixelYDimension
FocalLength
FocalLengthIn35mmFilm
GPSLatitudeRef
GPSLatitude
GPSLongitudeRef
GPSLongitude
GPSAltitude
GPSAltitudeRef
GPSImgDirectionRef
GPSImgDirection
GPSDestBearingRef
GPSDestBearing
LensMake

What	Value
Horizontal Angle of View
Compass Magnetic Declination

Geotagged Photo Site Search - Help

General

This page enables you to search for ACMA sites using a Geotagged Photo Image. Use the file button at the top of the page to select a file from your device, or simply drag and drop a geotagged photo on to this page. If there are sufficient geotags in your photo, then a search will be conducted for ACMA sites that are within 6km from the camera position, that are estimated to be line-of-sight from the camera position, and within the horizontal angle of view of the photograph. The results will be overlaid on your photograph with cyan coloured vertical markers - indicating the approximate horizontal direction of possible sites. Click/tap the markers to reveal more details and drill down on site details. You can also use the Map View button to view the context of your photo on the Site Location Map - in which case a positional marker will be drawn on the map at the camera location and, if directional information is available, a filter region 6km sector will also be drawn on the map. A list of possible sites found, along with the relevant extracted photo geotags, and any derived data, can be found under the "Possible Sites", "Relevant GeoTags" and "Additional and Derived Data" accordions above once a phtoto has been loaded and location searched.

Usage Notes

Most current geotagged photos do not contain any vertical tilt information. As such, when possible sites are detected, an approximate vertical marker will be overlaid on your photo - instead of a specific point. This is because the vertical component cannot be determined. After loading a photo, and sites have been found, use the slider on the right to vertically align the markers with the sites in the photo. If 6 or fewer sites have been found, then all markers will be offset vertically by the same amount when moving the slider, whereas if more than 6 sites are found a crude artificial perspective will be applied to the markers in that the higher the slider the more vertically offset the markers will appear with respect to their distance from the camera with the highest markers for sites farthest away from the camera position.

Line-of-sight estimates use 3 second DEM elevation information and do not take buildings or foliage into consideration. Further, the observer elevation at the camera position is the greater of the altitude geotag provided by the camera, or 2.5m above the interpolated elevation at the camera position. The highest antenna on the site coupled with the greater of the site recorded elevation or interpolated site elevation will be used for determining a line-of-sight estimate. No other RF characteristics are taken into consideration when determining a line-of-sight estimate.

If the camera directional geotags are with respect to Magnetic North instead of True North, a request to a third party webservice will be done to ascertain the magnetic declination using both the camera position and the date the photo was taken, and then adjust the direction accordingly. If this third party web request fails, then the direction angle will not be adjusted. Note: Currently, for devices with the following LensMake values, a Northern Hemisphere latitude declination correction value will always be used regardless of the hemisphere the photo was taken; .

If your photo does not contain sufficient directional and focal length geotags but still contains positional geotags, then the following status will appear; Insufficient Directional GeoTags. Try Map View. In this case, the directional markers will not be able to be overlaid on your photo but you will still be able to use the Map View by pressing the Map View button and view your photo position on the map.

If your photo does not contain the minimal positional geotags, the following status will appear; Not enough GeoTags found. You will not be able to search using the Photo View or Map View in this case.

Guidelines for taking photos

On your device, you may typically need to allow your camera to access your device GPS and device Compass in order for all necessary geotags to be contained in your photo.

On some devices, it may be necessary to select photos from your "Photo Library" rather than taking a photo from within this page if you haven't allowed your browser to access your GPS and Compass.

When taking photos, the following is suggested;

• Photograph sites within a 200m to 6km range from your location. Because, the recorded ACMA site precision values may only be accurate up to 100m, and that your device GPS precision accuracy may only be within tens of meters, and that your device Compass may also have a poor accuracy, for best results, try not to stand closer than 200m to a site when taking a photo of it. To limit server activity and keep reasonable response times, sites that are beyond 6km from your camera position will be ignored even if they are actually within line-of-sight to you.
• Hold your camera in the vertical plane, either portrait or landscape, with the horizon positioned around the vertical midpoint of your viewport. Again, because vertical tilt values are not extracted from geotags by this application, it is assumed that your photo image is with respect to being somewhat level in the horizontal plane.
• Try to hold your camera stationary aimed at the site(s) you wish to search for, at least, 10 seconds prior to taking your photograph. This will best allow your device to stabilise your GPS position and Compass bearing.

Privacy

Geotagged photos may be sensitive in nature. This application will extract your photo geotags and render your photo image all client side - that is entirely within your browser. Your photo image file itself will not be uploaded to the ACMA servers, rather only the necessary spatial geotagged attributes are sent to the ACMA to perform the required spatial search for sites. This applies to both when using main Photo View and also the Map View.