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

learn more… | top users | synonyms

11
votes
4answers
400 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
430 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 ...
8
votes
3answers
2k views

How to create TINs in ArcGIS from triangular elements

I am working with 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,Y,Z coords) and ...
7
votes
3answers
1k 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 ...
7
votes
1answer
560 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
1answer
5k views

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

Which is better DEM or TIN? What are the benefits/negatives of each?
6
votes
1answer
168 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 ...
6
votes
1answer
359 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
169 views

Does anyone know of a way to remove the distorted edges of a 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
4answers
929 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
938 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
4answers
806 views

TIN interpolation crash in Qgis

I have problems using the function TIN(linear) interpolation in Qgis. The program crashes when larger areas is interpolated. Map properties: vector map, Geometry typ = Point, features in this ...
4
votes
2answers
674 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 ...
4
votes
1answer
72 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
2answers
1k views

TIN Creation from 3D Contour File

I'm currently trying to import a 3D contour file into a Quantum GIS project. My question is, how can I export the DXF file from Microstation with height information? I already have imported it to the ...
3
votes
1answer
103 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
1answer
150 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 ...
3
votes
1answer
207 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
61 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
265 views

GIS beginner - interpolating contour lines from TIN-model vs. Grid in ArcGIS

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
213 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
1k views

DEM: How to convert a mosaic dataset to TIN?

I merged several DEMs together in on single DEM with mosaic dataset. Now I wanted to convert this mosaic dataset in Vector with TIN. But when I use the tool (3D Analyst Tool) Raster to TIN comes an ...
3
votes
1answer
212 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
151 views

How to create a TIN from UAV images or Google Earth images

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
1answer
245 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
3k 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
386 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
42 views

Using TIN - interpolation plugin - to calculate volume

I am having trouble calculating the volume of my TIN. I have attempted to create a TIN using the interpolation plugin in QGIS. Here are the steps that I followed. I added a Zvariable row in the ...
2
votes
1answer
215 views

How to calculate volume of bund around pit from TIN and external feature edge

I need to do some volume calculations of bunds. I suppose I should use the Surface Volume tool in 3D Analyst of ArcGIS. Here is the tool description. I am uncertain about the plane height parameter, ...
2
votes
1answer
167 views

Making a subsurface TIN model

I had been very glad if any of you have time to help me. I am a student and currently writing a thesis. In this paper I will create a 3D model of a glacier, where I will show the internal structures ...
2
votes
1answer
2k views

TIN Interpolation using a vector layer

I'm writing a plugin in QGIS and I'd like to generate a TIN surface using a vector layer with x,y and z (interpolation attribute). The idea is to visualize the same result like in the Interpolation ...
2
votes
0answers
38 views

Finding the slope of a polyline in QGIS 2.2 Valmiera

I am trying to find the average slope of a water course. I've drawn in the water course as a polyline over a large number of contour lines (the water course is long with a very large catchment area). ...
2
votes
0answers
51 views

Creating Triangulated Irregular Network (TIN) in QGIS?

I want to create a TIN and view it in 3D in qgis. The tin am creating using interpolation plugin is a raster TIN but i want the normal TIN(vector TIN).
2
votes
1answer
69 views

ST_Within for TIN or 3D objct in PostGIS

I would like to query if a point is located in the TIN object. My TIN object is closed (convex hull) object (i.e. surface of a round object). I tried to use ST_Within, but the error message returns ...
2
votes
0answers
82 views

Is the TIN created out of several cross sections different from merging the TINs created out of each set of two cross sections?

I have a river with cross sections that have the water surface elevation values. I am trying to create TIN from the water surface values and then compare it with the topo (to see the flooded areas). I ...
1
vote
2answers
193 views

Why can't I find the TIN Management tool in 3D Analyst toolbox?

I am looking for the CREATE TIN tool in the 3D Analyst toolbox, but I can´t find it. Any ideas why I can't find it?
1
vote
1answer
288 views

ArcScene3D layer rendering problem [duplicate]

I'm having problem with ArcScene. I'm doing a project on the visual impact of felling areas of forest in locations regularly visited/used by people. I have viewpoints and have created a TIN model ...
1
vote
1answer
68 views

Extracting DEM from imagery using ArcGIS for Desktop?

I'm using ArcGIS for Desktop and I'd like to know how can I extract the elevation model from a imagery of photos. I have the have each image (jpg) geo referenced. After, I don't know what tool may use ...
1
vote
3answers
231 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 ...
1
vote
1answer
39 views

How to create a TIN in arcGIS from 5 points using VB.NET

I am asking this question as I do not have any experience in VB.NET coding. I tried to follow ESRI help but I did not quite understand it. I have 5 points with X,Y and Z dimensions. How to add these 5 ...
1
vote
1answer
210 views

ArcScene TIN smooth

I created a TIN with ArcScene out of laserscan point data. I want to smooth the spikes (image below), to get a nice crossover on the elevations of the surface. Do you have any advice how to do that? ...
1
vote
1answer
89 views

Generating a 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 ...
1
vote
1answer
28 views

TIN gets distorted when I use hard clip to edit it

I have two cross sections from which I have created a TIN as can be seen in the following image. For removing the extra outer portion of the TIN, I created a polygon from the cross-sections and edited ...
1
vote
1answer
37 views

What is a better idea for modelling a fault plane than as TIN? [duplicate]

I am working on a project which runs on ArcGIS platform using VB.NET. It is to model a sub-surface fault plane (currently a plane rectangular model with some dip) and then to find required distances ...
1
vote
1answer
101 views

difference of reference plane/Plane Height / Z factor in Surface volume calculation?

I have a TIN surface with Minimum elevation 25 m and Maximum elevation 140 m. I want to calculate surface volume in different elevation between 25 and 140 meter. I wonder for example If I want to ...
1
vote
1answer
355 views

How to make polygon volume in TIN surface?

I want to measure surface volume of an area in different elevation layer. For measuring the surface volume I have to make a Polygon Volume as well. I have problem with making this polygon over the ...
1
vote
1answer
218 views

How can I make a reference plane to measure surface volume?

I am looking to make a reference plane like the links below. I want to measure surface volume of an area in different elevation layer. I just need to know how to make the reference plane in ArcGIS ...
1
vote
1answer
189 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 ...
1
vote
1answer
246 views

Restricting Tin interpolation in QGIS

I am trying to do a bathymetric map for a lake using QGIS. However, I see no option to impose a mask so interpolation does not extending beyond the boundaries of my lake. I have traced around the ...
1
vote
1answer
415 views

Can QGIS read ESRI TIN file directly?

Can QGIS open directly a TIN file generated with ArcGIS?