Autodesk Forge ../photo-to-3d/v1/file Error Code 14 - autodesk-forge

Question

Good Evening,
im geting the following error
{
"Usage": "0.55849504470825",
"Resource": "/file",
"Error": {
"code": "14",
"msg": "Specified values are invalid"
}
}
im trying to post a survey file to to the photo scene - following this documentation the file i have given the extension type .gcp and formatted it as a xml as shown on the example
<?xml version="1.0" encoding="UTF-8"?>
<surveydata coordinatesystem="LL84" description="Local coordinatesystem; meters" epsgcode="27700">
<markers>
<marker id="1" name="C2">
<images>
<image name="I100_0413_0027.jpg" xpixel="452" ypixel="401"/>
<image name="I100_0413_0028.jpg" xpixel="454" ypixel="1105"/>
<image name="I100_0413_0029.jpg" xpixel="464" ypixel="1840"/>
<image name="I100_0413_0030.jpg" xpixel="455" ypixel="2564"/>
</images>
<gcp x="539840.423" y="263277.897" z="16.097" checkpoint="false"/>
</marker>
<marker id="2" name="C3">
<images>
<image name="I100_0413_0009.jpg" xpixel="1887" ypixel="488"/>
<image name="I100_0413_0010.jpg" xpixel="1877" ypixel="1236"/>
<image name="I100_0413_0011.jpg" xpixel="1868" ypixel="1958"/>
<image name="I100_0413_0012.jpg" xpixel="1860" ypixel="2681"/>
<image name="I100_0413_0013.jpg" xpixel="1850" ypixel="3400"/>
</images>
<gcp x="539783" y="263219.485" z="16.511" checkpoint="false"/>
</marker>
<marker id="3" name="C4">
<images>
<image name="I100_0413_0036.jpg" xpixel="4255" ypixel="348"/>
<image name="I100_0413_0037.jpg" xpixel="4211" ypixel="1049"/>
<image name="I100_0413_0038.jpg" xpixel="4167" ypixel="1758"/>
<image name="I100_0413_0039.jpg" xpixel="4125" ypixel="2460"/>
<image name="I100_0413_0040.jpg" xpixel="4063" ypixel="3168"/>
</images>
<gcp x="539845.368" y="263230.711" z="15.852" checkpoint="false"/>
</marker>
</markers>
</surveydata>
on the creation of the scene i have set format=rcs-scenetype=aerial
this is the first time i have tried a survey file and i'm unsure what 'values' are invalid, could anyone help?

Answer 1

According to Survey File Example in documentation, when you specify coordinate system as "LL84":
<surveydata coordinatesystem="LL84" ...
it expects in gcp the long, lat and alt:
<gcp long="38.014125" lat="-122.540530" alt="2010.200000" checkpoint="false"/>
In your case, you specify the gcp as x,y,z:
<gcp x="539840.423" y="263277.897" z="16.097" checkpoint="false"/>
Thus, try to change the coordinate system as "XYZ":
<surveydata coordinatesystem=“XYZ” ...
Although documentation states that "only LL84 is supported for now.", this should do the trick.