Latest Contributions by ChristianReepmeyer

Dear Dan, my sincere apologies for the late reply, I someone didn't get a notification of your answer. I have attached an ArcScene image of the situation. This is the situation of the artefact layer after trampling in relation to an arbitrary horizontal plane. For the angle calculation, I think we can treat the three observation as one (to get the vector of the plane created through the three measurements and calculate the angle between these two planes). I think we need to treat the three observations also as one for the rotation, but I'm not sure how we can get a consistent direction of each triangle. Can we chose two observations and then calculate a vector which runs perpendicular to the line created by the first two observations through the third observation? ... View more

Hi Dan, thanks a lot for coming back to me so quickly. In 3D analyst, I had a look at 'slope' and 'aspect' (also 'surface aspect'). I found on this forum the suggestion to use the mean value in Zonal statistics to get the average slope of my polygon. However, both of these procedures want to have a raster file, I can create a DEM/TIN/raster from my data, select area by my created polygons and then do the means, but I'm not completely sure if this is the right approach. I also had a look at Cartography tools, 'calculate main polygon angle' and then compare the two layers outside of ArcGIS (Excel), but this gives me only 2D angles and not the angle in relation to the z-value. I'm also not completely sure whether ArcGIS calculates the same main axis when the polygon is rotated (if this makes sense). The original data is ASCII, but at the moment it is in an excel file, an example below: 1/4 SHELLS GRAMS LENGTH MM WIDTH MM   BEFORE-JCU ID X Y Z   AFTER-JCU ID X Y Z B26 3.149 31.6 22.33   27 999.567 1002.509 99.718   2475 999.541 1002.495 99.7   28 999.558 1002.495 99.718   2476 999.547 1002.513 99.696   29 999.545 1002.498 99.716   2477 999.557 1002.517 99.697 B27 2.49 32.87 23.8   33 999.761 1002.422 99.719   2457 999.766 1002.412 99.7   34 999.748 1002.423 99.717   2458 999.753 1002.42 99.695   35 999.739 1002.432 99.719   2459 999.741 1002.431 99.7 B28 4.462 43.7 23   54 999.665 1002.034 99.72   2276 999.681 1002.005 99.744   55 999.643 1002.036 99.717   2277 999.666 1002.027 99.744   56 999.63 1002.053 99.718   2278 999.653 1002.028 99.758 ... View more