10 votes
Accepted

Reprojecting a raster DEM from meters to feet using QGIS?

You're not actually 'reprojecting' the data (the coordinate system, that is), you're simply multiplying it by a constant (as in the 'times' tool in ArcGIS) to change the pixel values from one number ...
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10 votes

Extracting Values to Points without ArcGIS Spatial Analyst?

Script: import arcpy, traceback, sys, os pntFile=arcpy.GetParameterAsText(0) rasters=arcpy.GetParameterAsText(1) rasters=rasters.split(';') theFields=[x.name.lower() for x in arcpy.ListFields(...
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  • 21.6k
9 votes
Accepted

Finding pixels in DEM with 5% slope or less?

You mention 3D Analyst so I am assuming you have ArcGIS. Use the tool ArcToolbox-3D Analyst Tools-Raster Surface-Slope to create a slope surface from your LiDAR data. Use the tool ArcToolbox-3D ...
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  • 7,172
7 votes

Creating Buffer Polygon following Elevations using ArcGIS Desktop?

Workaround for what you describe in absence of spatial analyst: arcpy.Buffer_analysis("target","../buffer.shp", "100 Meters") arcpy.FeatureVerticesToPoints_management("buffer","../points.shp","ALL") ...
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  • 21.6k
6 votes

Importing 3D Analyst functions with ArcPy?

Sorry for bumping this old question, but a Python module's name cannot begin with a number, so arcpy.3d will never work. To import the module, you'll need to reference ddd: from arcpy.ddd import * ...
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  • 116
6 votes
Accepted

Extracting Values to Points without ArcGIS Spatial Analyst?

3D analyst's Add Surface Information will add a Z field to your vector data with the data value from the overlapping raster layer: Interpolates surface elevation properties for point, multipoint, ...
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  • 158
6 votes

How to export a jpg from ArcScene?

There is no Layout View in ArcScene. You can export your scene to JPG by using File > Export Scene > 2D... and selecting JPEG in the Save As Type drop-down of the Export Map dialog.
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  • 29.2k
5 votes

Enabling Z value

I don't know of a way to enable Z values afterwards, but here's a workflow to create a new polyline with Z enabled and copy the existing fields and data over: 1) Create a new polyline feature class ...
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  • 9,011
5 votes
Accepted

How to calculate point(or XY) for Start point of Slope and Endpoint of Slope along the Section line on DTM

From your diagram it appears that you're interested in the points where the change in gradient is the most. Since the gradient of a line measures the rate of change (i.e. can be considered the ...
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  • 15.3k
5 votes
Accepted

Labelling an axis in ArcScene?

Turn on the 3D Graphics toolbar, adjust some of the default text graphics properties before you add a label so that it is added large enough to see/find. Select the 3D Text tool Use the 3D Text tool ...
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  • 29.2k
5 votes

Viewshed Analysis incorporating tree height

Your workflow will be something like this (you don't mention what software you're using but this should work with anything). Basically you just need to add your pine trees to the DEM as if they were ...
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  • 12k
5 votes
Accepted

Slope calculations appear to be 90 degrees off in ArcGIS 3D Analyst?

I think your error is a result of performing a slope calculation on a DEM that isn't in a projected Coordinate Reference System (CRS). The reason for performing a transformation/warping of your DEM is ...
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5 votes
Accepted

What is the arcpy.ddd module?

When you type arcpy.ddd into the python console in ArcMap or ArcCatalog it notes arcpy.ddd is: arcpy.ddd The 3D Analyst toolbox provides a collection of geoprocessing tools that enable a wide ...
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  • 34.6k
5 votes

Finding pixels in DEM with 5% slope or less?

You can take the DEM and run the "Slope" tool in 3D Analyst. It is under the "Surface" Toolset. Choose "percentage" as the output type. Once you have the "Slope" raster you can run the Reclass tool ...
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  • 3,429
4 votes

How to enable 3D analyst in ArcGIS through VB.NET?

If your application is running inside of ArcGIS your product license should handle the activation of extensions for you. Failing that you can always use ArcObjects to check out the required extensions....
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  • 10.6k
4 votes
Accepted

Selecting Features located in extruded surface using ArcScene?

Perhaps one of these two methods will work for you: ArcMAP Select by Location 3D relationships and ArcScene Select by 3D Box How about Inside 3D (3D Analyst)? Since the output of Extrude Between is ...
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  • 3,043
4 votes
Accepted

How to build cylinder or cube multipatch objects in ArcGIS?

It is possible to turn borehole logs (XYZ points) into 3D polylines. I wrote a sript a few years ago that did just that but it was with ArcObjects. Each group of points had a unique value and I just ...
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4 votes
Accepted

Difference between "hard edge" and "soft edge" in Arc's Add TIN Line?

Per the help file: Hard and soft qualifiers for line and polygon feature types are used to indicate whether a distinct break in slope occurs on the surface at their location. A hard line is a ...
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  • 15.5k
4 votes

Choosing video card in laptop to use with ArcScene

GIS wont be a big drain on your graphics card. You might not want to hear this, but even an Intel integrated graphics chip will do fine. I definitely wouldn't go for a workstation graphics card, they ...
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  • 13.1k
4 votes
Accepted

Finding average elevations from a Raster DEM, applying those to Vector Grid created with GME

If you have access to Spatial Analyst, you could use the Zonal Statistics tool. You could treat each cell in the angled vector grid as a zone, and use Zontal Statistics to calculate the MEAN ...
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  • 20.5k
4 votes

Extracting Values to Points without ArcGIS Spatial Analyst?

You can do this with Hawthorne Beyer's free Geospatial Modelling Environment, (GME, formerly known as Hawth's Tools). There is a tool in there, Intersect Points With Raster, which as its name implies, ...
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  • 12k
4 votes
Accepted

CHaMP Topo Processing Menu not active in ArcMap 10.1

The toolbar is designed to work with a "SurveyGeodatabase", which is created in the first step of the Toolbar workflow. Unless you are working with a set of total station data, I think the toolbar is ...
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4 votes
Accepted

Calculating difference between two rasters using ArcGIS for Desktop?

Yes you can use Spatial Analyst for this. I'm not a Spatial Analyst expert, but I would look at the Raster Math tools to accomplish this - starting with the Minus tool.
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  • 29.2k
4 votes

Making 3d block from flat 2d polygon in ArcScene?

The workflow to get this: Elevation of original buffer = 100m. I defined plateau elevation = 150 m, and computed D=50/tan(35). D=71.40 m. Next - create negative buffer "outside only" with minus 71.40 ...
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  • 21.6k
4 votes

Digital elevation model versus hillshade for creation of cross-section In ArcMap

If I understand you correctly, the DEM contains the values (elevation) that you want to use to create your cross sectional visualizations to show faults or fractures in the terrain. You may want to ...
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  • 2,421
3 votes

Creating TIN in ArcGIS from 5 points using VB.NET?

The best recommendation I can give is don't. Creating a TIN using ArcObjects is a tedious process. You would be best looking at IGeoprocessor and calling the existing tools. If you have 5 points in ...
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3 votes
Accepted

Fixing Hole in DEM?

I had the same problem using some SRTM DEMs. Besides from using some later and more correct version or another data source, I'd recommend setting all values below some chosen threshold (that will only ...
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  • 1,234
3 votes
Accepted

Problem with interpolating a vertical profile in 3D Analyst (ArcMap 10.1)

Vince's comment partially answers your problem - your data is in degrees, so the x axis or length is also going to be displayed in degrees rather than meters. However I think you're also confusing ...
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  • 15.5k
3 votes

cut fill arcgis 10.1 doesn't works

i solved the problem by converting the tow TIN to a raster before execute the cut fill 3D analyst tool :
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  • 615
3 votes

2D/3D Area parameter differences in Surface Volume calculation dialog box?

2D area is calculated from a flat surface in plan view (looking down). 3D area takes into account 3D characteristics of the surface. A 3D polygon with peaks and valleys will have a larger 3D surface ...
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