Questions tagged [tin]

Acronym for triangulated irregular network. A vector data structure that partitions geographic space into contiguous, nonoverlapping triangles.

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11
votes
4answers
608 views

Given a list of surveyor points, what is the algorithm used to simplify the points and retain the terrain characteristics?

Given a terrain and surveyor points sampled from from it or from its contours, is there any algorithm that one can use to simplify the points ( i.e., reduce the surveyor points number) and at the same ...
9
votes
1answer
633 views

Performing Overlay of Two Triangulated Irregular Networks (TIN)

I am referring to the paper here, section 2.6.1, on the adding and subtracting of two TINs: The addition of two TINs can be determined exactly and stored into a new TIN, because the addition of ...
8
votes
3answers
2k views

Generating TIN from DEM using MacOSX/Unix tools?

I'd like to generate a 3d terrain model moving from a DEM dataset (currently in shp and GeoTIFF format). As far as I understand it, the first step of the better path would be generating a TIN, but I ...
8
votes
3answers
3k views

Creating TINs in ArcGIS from triangular elements?

I am working with Finite Element Method (FEM) models with triangular elements, and I'd like to view the results as TIN surfaces in ArcGIS (and in ArcScene). In my external source, I have nodes (with X,...
7
votes
1answer
25k views

Which is better, DEM or Triangles (TIN/Terrain)

Which is better DEM or TIN? What are the benefits/negatives of each?
7
votes
1answer
396 views

Representing a TIN in GeoJSON

Regarding the GeoJSON representation of a TIN, are there any specifications or existing implementations I may not be aware of? You could probably hack one together using the multipolygon feature ...
7
votes
2answers
977 views

(Smooth) Isoline Extraction from TIN - Algorithms

Can anyone point me to a clear document or algorithm for extracting smooth isolines from a Triangular Irregular Network? I've seen some examples using the jagged linear methods, but can't seem to ...
6
votes
2answers
10k views

Seeking tool to generate Mesh from DTM?

Are there any tools that can take a DTM, in asc or geotiff format and generate a mesh from this that can used in meshlab or similar software. I have asc DTM file that I need to convert to a ply mesh ...
6
votes
2answers
2k views

Has TIN been superseded by Terrain Dataset in ArcGIS?

I've had version 10 for a few months but it wasn't until today that I really tested the 3D Analyst extension. (Other then visualizing data) I already noticed a lot of changes; a number of tools have ...
6
votes
1answer
481 views

Problems creating TIN from British Columbia DEM data

Is anyone familiar with creating a TIN using ArcGIS9.3 and British Columbia DEM data (.GEN files)? I can't figure out how to get the breaklines to work during the creation of the TIN. Using ...
5
votes
3answers
2k views

Removing distorted edges of TIN surface?

I'm trying to remove the stretched edges of a TIN surface without having to draw a polygon around the features that I want clipped. Does anyone know how to do this without free hand drawing? I was ...
5
votes
2answers
13k views

Creating Tin from Elevation Points in QGIS?

I have a shapefile of points with values that represent elevation at the given point. I know that I can create a TIN from these points, but the fields in the TIN do not represent the elevation. Rather,...
5
votes
2answers
3k views

Generate TIN from elevation data in Python (no Arc)

I would like to generate a 3d terrain model of an area, and I am stuck on creating the TIN (which I will convert to an STL). I know there are plenty of ways to use ArcGIS, QGIS, 3DEM, and various ...
5
votes
4answers
2k views

TIN interpolation crash in QGIS

I have problems using the function TIN (linear) interpolation in QGIS. The program crashes when larger areas are interpolated. Map properties: vector map, Geometry typ = Point, features in this ...
5
votes
2answers
1k views

Comparing two TINs created using ArcGIS for Desktop?

I have the following two files: LiDAR las file1 Let's give it a name LiDAR las file2, contains the same file1 data, where number of points randomly removed. So if file1 contains X number of points, ...
5
votes
4answers
2k views

Addition and Subtraction of two TINs

I am referring to the paper here, section 2.6.1. Is there an existing library ( in C++ or .Net) that already has this implemented? Namely, taking two Triangulated Irregular Network (TIN), we create a ...
5
votes
3answers
1k views

Getting from a DEM to points that could be used for a TIN

I have a DEM, and would like to create a set of points that I can use to make a mesh for a 3d modeling program, such as Maya, Blender, or SketchUp. If I were to make a TIN from a DEM in ArcGIS, ArcGIS ...
4
votes
3answers
2k views

What are limits on ArcScene and TINs from LiDAR?

I am trying to load anywhere from 5 to 10 LiDAR TINS into ArcScene. I am using ArcGIS Desktop Evaluation (student) 9.3.1. I just built a new computer with a AMD Phenom II X6 1090T six core processor, ...
4
votes
1answer
2k views

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

Is there a technical difference between "hard edge" and "soft edge" in Arc's Add TIN Line on the TIN Editing toolbar? In both you can specify the height of this constraint and they seem to be doing ...
4
votes
1answer
2k views

How to give elevation information to a polygon feature class using existing TIN file ? (geological mapping)

I'm an ArcGIS 10.1 user. My issue: I have a printed form of a map which depicts geological bodies being surface rock occurence. Additionaly, there are elevation contour lines. I digitized the map by ...
4
votes
1answer
572 views

TIN Interpolation in QGIS creates weird lines?

I am using TIN Interpolation to interpolate point features based on their cost attribute (value is between 0 and 5000). Graduated symbology creates something like this: However when I am using TIN ...
4
votes
1answer
300 views

Edges of Surface Difference tool output are invalid

See this image, an example output of the ArcGIS Surface Difference tool (gives cut/fill volumes): I have occasionally come across the illustrated problem where the output does not cover the full ...
4
votes
1answer
2k views

TIN Creation from 3D Contour File

I'm currently trying to import a 3D contour file into a QGIS project. How can I export the DXF file from Microstation with height information? I already have imported it to the QGIS project but ...
3
votes
1answer
138 views

TINs: What advantage does unequal sampling of data points have over regular sampling?

Triangulated Irregular Networks. Under what conditions is one sampling method more appropriate over the other?
3
votes
2answers
4k views

Converting from ArcGIS TIN to LandXML?

I am working on a project that involves some back and forth between ArcGIS 10.1 and Bentley Microstation and Geopak. Microstation/Geopak has the ability to import/export LandXML files for 3D ...
3
votes
1answer
410 views

Interpolate (TIN) within a polygon extent QGIS/GRASS

I am trying to interpolate (TIN) in QGIS to produce surface models. I need to interpolate within a polygon area extent. The options available in QGIS do not allow this as far as I am aware. Is there ...
3
votes
1answer
400 views

Converting 3D shapefile to TIN

I have a 3D building model (Polygon ZM) that I would like to turn to DEM, following the accepted answer to Elevation data from 3D shapefile of buildings to raster DEM According to the description, ...
3
votes
1answer
2k views

Exporting ArcGIS TIN file to *.tin file?

How can I create a .tin file from a ArcGIS TIN file? I can't seem to find a export to .tin solution.
3
votes
1answer
924 views

Convert coordinate system of Lidar or TIN?

I have Lidar data and I want to create a TIN from it, and then run the TIN Triangle tool to create a polygon shapefile of the triangles. The only thing is that the Lidar data is in a UTM CS with ...
3
votes
1answer
1k views

Interpolating contour lines from TIN-model vs Grid in ArcGIS for Desktop?

I am a complete beginner in GIS and taking a class right now, and we are doing some assignments in ArcGIS - ArcMap. In one of them we were given a shapefile with heightpoints. These had been manually ...
3
votes
1answer
361 views

Extrude between wrong on the edge, ArcScene

I'm trying to extrude between two Tins which are equally shaped. However if Extrude Between those tins using input feature created by minimal_bounding from one of them I get a strange error that two ...
3
votes
1answer
260 views

TIN interpolation problem

I made a TIN interpolation of some height points but the resulting raster appears with some weird lines (like in the pic) What can i do to avoid this result? Here are the input parameters. Sorry ...
3
votes
0answers
101 views

Generating TIN from elevation data in Java [closed]

I would like to generate TIN from standard elevation data in Java. Are there any libraries I can use? I could not find any just by googling. In addition library should be suitable for commercial use ...
3
votes
0answers
111 views

Display points with lowest elevation within a 1m2 grid - QGIS 2.18.2

I have a few thousand points measured with totalstation from an archaeological site. The points are measured quite unevenly which makes TIN triangulation and subsequent DEM generation a mess. Some ...
3
votes
0answers
142 views

Optimum Path finding (for Cross Country Movement) using TIN

I am working on path finding algorithm (using A*) for cross country movement (not for road movement) on map using grid based approach. Algorithm supports path calculation considering slope of terrain. ...
3
votes
1answer
457 views

Intersect multilinestring (A) with multilinestring (B) retaining linear sequencing in resultset? [closed]

I have a PostGIS table testtin2 which is a sort of pseudo TIN consisting of a single multilinestring geometry, which I am intersecting with another table align, also a multilinestring, to generate a ...
2
votes
3answers
750 views

Creating TIN from UAV images or Google Earth images? [closed]

I'm starting using ArcGis and I would like to create a TIN from UAV images. What are the steps that I have to follow? I think: Mosaic the images, merge o join. (I have 40 aereal pictures in .JPG) ...
2
votes
3answers
2k views

ArcMap - Making DEM using GPS vector data [closed]

I am new to GIS and GPS. I am going to make a digital elevation model of my school's campus using a trimble gps unit. I know the accuracy is not the best but it is just for a school project. My ...
2
votes
1answer
4k views

Converting LiDAR point cloud to 3D mesh?

I have an unstructured point cloud of a street in LAS format (.las), scanned from a driving car. The point cloud also stores RGB information. Is there any software that can convert the point cloud to ...
2
votes
1answer
629 views

Converting TIN to Multipolygon in PostGIS?

ST_Tesselate returns TIN geometry. But then I need to use other software to process geometry data and it only accept (multi-)linestrings and (multi-)polygons. Is there way to convert TIN triangles ...
2
votes
1answer
724 views

If I convert a TIN to a raster in ArcGIS will results from the two versions of the surface be comparable?

I have converted a TIN to a raster. I found that the top of a bund wall shifts laterally in position between the TIN and the raster into which it has been converted using the TIN to raster tool in ...
2
votes
1answer
716 views

How to improve Triangulated Irregular Network (TIN) display speed?

I am preparing Triangulated Irregular Network for large area (5000 Sq Km) in ArcGIS, The TIN models takes too much time to open in ArcMap, and if I move or change anything again its starts to ...
2
votes
2answers
12k views

Can I create a TIN from contours lines (shp) in QGIS?

I need to do a slope analysis, and would like to make a TIN from 2m contours lines. Or do a slope analysis directly from contours? The only DEM available is not precise enough. I do not have any ...
2
votes
1answer
561 views

Creating TIN and contours in ArcGIS for Desktop?

I am upgrading from ArcView 3.1 to ArcMap 10.1. I have multiple LIDAR (bare earth) .txt files (x,y,z) that I would like to use to create a "TIN" (or is it Terrain Dataset in 10.1) and then contours? ...
2
votes
1answer
1k views

How to read .adf (TIN) map files?

I have a set of maps in few formats : TIN ├── [4.0K] info │   └── [2.6K] arc.dir ├── [ 708] log ├── [374K] M-33-45-D-d-4.asc └── [4.0K] m-33-45-d-d-4tin ├── [ 96] tdenv.adf ├── [1.1M]...
2
votes
1answer
794 views

Script for Editing TIN in Arcgis: modelbuilder works, when exported as script gives an error

Arcgis can give such a headache! I want to automate loads of small tasks, and so I need to edit empty TIN with python in order to create a full TIN. My srcript is giving errors, so I tried by hand to ...
2
votes
1answer
305 views

PyQGIS interpolation classes and triangulation file without interpolation raster

I am trying to interpolate lines using Interpolation plugin in QGIS. There is an option for exporting triangulation file. I don't want to create raster interpolation. In this case, I want only ...
2
votes
2answers
1k views

How can I create a fill beneath my 3D surface in ArcScene?

I came across this image on http://desktop.arcgis.com/en/arcmap/latest/extensions/3d-analyst/choosing-the-3d-display-environment.htm I would like to create something similar that shows the below ...
2
votes
1answer
615 views

How to compare a TIN and IDW-derived raster DEM quantitatively?

I'm a student and got the assignment to compare a TIN with a height raster 'quantitatively' and I'm not quite sure how to proceed. I tried subtracting the one from the other but it doesn't seem to be ...
2
votes
1answer
71 views

How to change TIN values view in QGIS

I created a TIN raster for an height values. The color ramp is: but i want to delete all the zero numbers and stay with only integers like this( i do it manually in the layer properties): How can i ...