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The 2x1 sensor geometry was tested with microscopic measurement. Two slides from Chris Kenney's presentation shows the pixel sizes:

The same presentation in PDF format: Pixels size

Most of pixels

Optical measurement

Optical measurement is maintained by Chris Kenney. Detector or its quad is installed on microscope table and 3-d coordinates of all 2x1 sensor corners are measured with precision about 8um (RMS) in x-y plane. All corners in the measurement are numerated in arbitrary order. This order does not coincide with numeration of 2x1 in DAQ, as shown on plots below. It is expected that numeration order should be the same for different measurements. This procedure depends on CSPAD construction;

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        offset of 2x1s in quad (for tilt)
       /  offset of quads in entire image (for tilt)
      /     /     gaps
     /  /   /  shifts
    /  /  /shifts
  /
  / 15 40 0 32 / <--- for X 
 /  15 40 0/
 32  <--- for Y XOffQ XOffD gapX shiftX
   YOffQ 0YOffD gapY 0shiftY
 0  0ZOffQ ZOffD <--- for Z 
gapZ shiftZ

Typical values:

   15 40 0 32
   15 40 0 32
    0  0 0  0

quad_rotation

Tail of the path: quad_rotation/<run-range>.data
Parameters: rotation angle of 4 quads in CSPad in n*90 degree:

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Algorithm description will be added soon.

Xoffset_qi = XOffQ + xqi + dxqi + [-gapX+shiftX, -gapX-shiftX, +gapX-shiftX, +gapX+shiftX]
Yoffset_qi = YOffQ + yqi + dyqi + [-gapY-shiftY, +gapY-shiftY, +gapY+shiftY, -gapY+shiftY]
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References

Description of CSPAD layout from DAQ
CSPAD quad metrology
CSPad pixel layout in quads