MZKnow
 lvl.1
Canada
Offline
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HI Everyone,
i know this might be a 'duh' issue , but i am newbie in this. if i have an image with its exif data. can i calculate the foot print of it on the ground ? i have seen some posts about using the FOV angle and the Height from the data and use tan angle to determine the width of the image. what i am failing to grasp here is that what height ? if i use the height from the exif data and use that function the foot print does not make sense (it comes about half the actual length i measure using google earth of the same spot).
some other post say add the height from exif to the altitude of the home point. the problem is i only have the image and i do not have any info about the home point.
the exif data is listed below
any help would be appreciated
thanks
ExifTool Version Number : 10.10
File Name : DJI_0011.JPG
Directory : /var/www/drone/public/uploads/image/image/3395
File Size : 7.9 MB
File Modification Date/Time : 2019:07:10 16:46:30+00:00
File Access Date/Time : 2020:03:27 08:56:56+00:00
File Inode Change Date/Time : 2020:03:27 08:56:02+00:00
File Permissions : rw-rw-r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
Exif Byte Order : Little-endian (Intel, II)
Image Description : DCIM\101MEDIA\DJI_0011.JPG
Make : DJI
Camera Model Name : FC6310
Orientation : Horizontal (normal)
X Resolution : 72
Y Resolution : 72
Resolution Unit : inches
Software : v01.07.1641
Modify Date : 2019:07:09 10:35:26
Y Cb Cr Positioning : Centered
Exposure Time : 1/500
F Number : 5.6
Exposure Program : Program AE
ISO : 100
Exif Version : 0230
Date/Time Original : 2019:07:09 10:35:25
Create Date : 2019:07:09 10:35:25
Components Configuration : -, Cr, Cb, Y
Compressed Bits Per Pixel : 3.612264561
Shutter Speed Value : 1/500
Aperture Value : 5.6
Exposure Compensation : 0
Max Aperture Value : 2.8
Subject Distance : 0 m
Metering Mode : Center-weighted average
Light Source : Fine Weather
Flash : No flash function
Focal Length : 8.8 mm
Flashpix Version : 0010
Color Space : sRGB
Exif Image Width : 4864
Exif Image Height : 3648
Interoperability Index : R98 - DCF basic file (sRGB)
Interoperability Version : 0100
Exposure Index : undef
File Source : Digital Camera
Scene Type : Directly photographed
Custom Rendered : Normal
Exposure Mode : Auto
White Balance : Auto
Digital Zoom Ratio : undef
Focal Length In 35mm Format : 24 mm
Scene Capture Type : Standard
Gain Control : None
Contrast : Normal
Saturation : Normal
Sharpness : Hard
Subject Distance Range : Unknown
Serial Number : 4d31b8d1e1acffb45e2be9dfdbd70276
GPS Version ID : 2.3.0.0
GPS Latitude Ref : North
GPS Longitude Ref : West
GPS Altitude Ref : Below Sea Level
XP Comment : Type=N, Mode=P, DE=None
XP Keywords : v01.07.1641;1.2.0;v1.0.0
Compression : JPEG (old-style)
Thumbnail Offset : 10240
Thumbnail Length : 11220
About : DJI Meta Data
Format : image/jpg
Absolute Altitude : -5.21
Relative Altitude : +19.90
Gimbal Roll Degree : +0.00
Gimbal Yaw Degree : -133.60
Gimbal Pitch Degree : -90.00
Flight Roll Degree : +0.90
Flight Yaw Degree : -133.90
Flight Pitch Degree : -4.80
Cam Reverse : 0
Gimbal Reverse : 0
Self Data : 5bdce2d1411a1db817392b392.83.0
Calibrated Focal Length : 3666.666504
Calibrated Optical Center X : 2432.000000
Calibrated Optical Center Y : 1824.000000
Rtk Flag : 0
Version : 7.0
Has Settings : False
Has Crop : False
Already Applied : False
MPF Version : 0010
Number Of Images : 2
MP Image Flags : Dependent child image
MP Image Format : JPEG
MP Image Type : Large Thumbnail (VGA equivalent)
MP Image Length : 265722
MP Image Start : 8041741
Dependent Image 1 Entry Number : 0
Dependent Image 2 Entry Number : 0
Image UID List : (Binary data 66 bytes, use -b option to extract)
Total Frames : 1
Image Width : 4864
Image Height : 3648
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:2 (2 1)
Aperture : 5.6
GPS Altitude : 5.2 m Below Sea Level
GPS Latitude : 45 deg 34' 45.35" N
GPS Longitude : 73 deg 27' 12.05" W
GPS Position : 45 deg 34' 45.35" N, 73 deg 27' 12.05" W
Image Size : 4864x3648
Preview Image : (Binary data 265722 bytes, use -b option to extract)
Megapixels : 17.7
Scale Factor To 35 mm Equivalent: 2.7
Shutter Speed : 1/500
Thumbnail Image : (Binary data 11220 bytes, use -b option to extract)
Circle Of Confusion : 0.011 mm
Field Of View : 73.7 deg
Focal Length : 8.8 mm (35 mm equivalent: 24.0 mm)
Hyperfocal Distance : 1.26 m
Light Value : 13.9
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lvl.2