Home - General / All posts - Calculate slope and aspect from a drawing component
 yves61439 post(s) #07-Sep-23 17:17 With M9, I have a project with a) a drawing with building areas called 'B'b) a DSM .LAZ file called 'L', with a height attribute Z (height, in metres)both files have the same date & projectionc) I clipped 'L', keeping the points that are contained within 'B'd) I subsequently ran a Voronoi transform on 'L', and called the resulting drawing 'VL'e) then I ran a Overlay Identity Transform with the 'VL' drawing as source , 'B' as overlay and called the resulting drawing VLinBf) I deleted the voronoi areas in 'VLinB' that are not contained within 'B'g) I updated VLinB with the Z (height attribute) from 'B'I would like to calculate the slope and the aspect for each area in 'VLinB'.I found in the manual the slope and aspect transforms starting with a elevation raster . https://manifold.net/doc/mfd9/transform_-_tiles__slope.htmWhat steps need I undertake to calculate slope and aspect for each area starting from this 'VinB' drawing ?What are the possible solutions within M9?
 yves61439 post(s) #07-Sep-23 19:14 OK.In the meantime I found this information in the manual which helped a lot !convert vector to rasterhttps://manifold.net/doc/mfd9/spatial_join_example___convert_vector_to_raster.htm
 danb2,064 post(s) #07-Sep-23 20:06 If I understand correctly, it sounds like you are already on the right track, but I would suggest grabbing the points contained within B and of the correct classification (if this is appropriate or if you have a classification field 2 is normally ground I believe).Next, interpolate a surface presumably DEM from the point set using something quick such as tinning (https://manifold.net/doc/mfd9/transform_-_geometry__interpolate.htm) and then derive slope and aspect from this surface.All of this can be done in the GUI using the transforms and even better, you can harvest the SQL and build a semi or automated process using them as required. Landsystems Ltd ... Know your land | www.landsystems.co.nz
 yves61439 post(s) #08-Sep-23 14:07 @danb : Thank you. I will dive into 'interpolation' and have a closer look.
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