Hi everyone, first time posting so please bear with.
I’m creating a model in SketchUp Pro that I’ll be exporting into some other software. The area I’m working on is about 28sqkm.
I’ve pieced together the area using the “import imagery” function multiple times, at varying levels of zoom to get more detail where I need it. Some of the images overlap, but SketchUp appears to have done a good job of lining everything up despite the “image far from origin” type warnings. I had to move one image with the move tool to make sure the terrain lined up (it was about 0.5m out and oddly was very close to the origin).
I’m trying to accurately trace over the features shown in the imagery (e.g. buildings, road, vegetation) as I want the model to be geospatially accurate. I’m planning on extruding the features that need it (e.g. buildings). I need to do this as the software I’ll be exporting to needs the different types of terrain to be separate surfaces (e.g. think assigning material to certain areas; grass is grass, concrete is concrete etc.) as the software ultimately assigns material properties to the individual surfaces (in a similar way to how SketchUp surfaces/materials work).
I’ve enabled “show hidden geometry” and have been manually tracing around the features in the image, making sure to follow the triangular geometry (such that the line I’m drawing is always an edge of a triangle, except when drawing on the face of the group). I started by doing the entire outside edge of the model. I’ve been keeping an eye on the draw tool to make sure I’ve been using the “draw on group” category (e.g. on edge in group, endpoint in group, midpoint of group, face of group). I moved on to drawing around the ‘big obvious lumps of topography’ like significant areas of vegetation and water.
This has worked for some surfaces, for example there is a section of sea that SketchUp has identified as being a different surface now it is fully enclosed (drawn around) and is showing the image texture with a grey-ish sheen over the surface that I can select. I can successfully apply a material to that surface.
However, some of the other areas are not showing as separate surfaces despite being enclosed as the sea area is.
I’m not sure what I’m doing wrong - though I’m wondering if the issue is that some of my geolocated imagery is overlapping and SketchUp is struggling to treat one area that is made of two images as just one area (or I’m somehow drawing on different ‘layers’ of topography, although everything in my model is “Layer0”) .
Having searched around a bit, I’ve seen some stuff about making the surface into a ‘physical model’ - i.e. adding a volume ‘under’ the image to make a 3d shape rather than just a 3d surface. I’ve also read about grouping, using the smooth edges feature, and using the stamp tool (which I don’t think is suitable for my purposes as I’m copying the image, not stamping onto it), but I didn’t want to start down any of those lines if there was something fundamentally wrong with my model - so thought it best to ask!
Any advice/help would be greatly appreciated, as you may have noticed I’m a SketchUp newbie.