I have a shapefile includes polygon features of tilted solar panels and I used "Calculate Geometry tool" in ArcGIS to find out the projected area of solar panels (horizontal area).
I am looking for ArcGIS tool or an accurate algorithm to calculate surface area, assuming the tilt angle of solar panels is 40 degree.
I found the following formula:
Surface Area = Planimetric Area / cosine(Slope Angle)
hertzis more simple expresed