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How can I determine the datum and coordinate system used

I had a drone mapper give me images.  but I cannot determine what is the datum or coordinate system to get contours from the images.  I'm using infraworks.  Could you please assist?

mike shick

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Everything we create is in WGS84 EPSG:4326 that uses decimal degrees in latitude and longitude. 

Here is a sample GDAL readout:

Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
Origin = (-82.475616887606904,27.952238550985552)
Pixel Size = (0.000000745539142,-0.000000662027297)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( -82.4756169, 27.9522386) ( 82d28'32.22"W, 27d57' 8.06"N)
Lower Left ( -82.4756169, 27.9503121) ( 82d28'32.22"W, 27d57' 1.12"N)
Upper Right ( -82.4744218, 27.9522386) ( 82d28'27.92"W, 27d57' 8.06"N)
Lower Right ( -82.4744218, 27.9503121) ( 82d28'27.92"W, 27d57' 1.12"N)
Center ( -82.4750193, 27.9512753) ( 82d28'30.07"W, 27d57' 4.59"N)
Band 1 Block=1603x1 Type=Byte, ColorInterp=Red
Mask Flags: PER_DATASET ALPHA
Band 2 Block=1603x1 Type=Byte, ColorInterp=Green
Mask Flags: PER_DATASET ALPHA
Band 3 Block=1603x1 Type=Byte, ColorInterp=Blue
Mask Flags: PER_DATASET ALPHA
Band 4 Block=1603x1 Type=Byte, ColorInterp=Alpha

Zane
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