Tin to raster

Tin to raster DEFAULT

Blocky Raster from TIN. How to increase resolution?

From what you have described, you have used the default settings in the conversion of a TIN to raster.

The default describes the use of a sampling distance based on "OBSERVATIONS". With your input data having a relatively small extent, the default of 250 Observations will result in a coarse or "blocky" raster.

To allow the conversion produce a smaller cell size you need to define the cell size you want your output raster to be.

In the Sampling Distance input, select the "Observations 250" text and delete it. The type in "CELLSIZE X" Where X is the desired cell size.

You should get a better result, and you may need to experiment with the cell size to get the result you looking for.

answered Jul 5 '18 at 0:13

Keagan AllanKeagan Allan

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Sours: https://gis.stackexchange.com/questions/288466/blocky-raster-from-tin-how-to-increase-resolution

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TIN To Raster converts a triangulated irregular network (TIN) to a raster through interpolation. Every cell in the output is assigned a height or NoData value depending on whether or not the cell center falls within the TIN's interpolation zone.

The Method determines the interpolation used. It can be LINEAR or NATURAL_NEIGHBORS. Linear interpolation views TIN triangles as planes. Each output cell is assigned a height by finding which triangle, in 2D space, it falls in and evaluates the position of the cell center relative to the triangle plane. Natural neighbor interpolation produces a smoother result than linear. It uses an area-based weighting scheme on the closest TIN nodes found in all directions around each output cell center. Hard breaklines in the TIN will influence the result as the natural neighbor surface is not continuously smooth across them. Learn more about natural neighbor interpolation.

The Sample Distance variable represents the output cell size and is defined in one of two ways. The OBSERVATIONS keyword is followed by an integer that indicates the number of columns desired in the output. The cellsize is determined based on the output extent and number of columns. By default, OBSERVATIONS 250 is used. To provide an explicit cell size, use the CELLSIZE keyword followed by the desired size, which can be given as a floating point number.

The Z Factor variable is used to convert the z-units of the output raster. The output heights are multiplied by this value. A default Z Factor variable is calculated to convert the z-units to the same unit of measure as x,y if, and only if, x-, y-, and z-units are defined in the spatial reference of the input TIN and are standard projected units (for example,. meters, feet). If x-, y-, and z-units are the same, a value of 1.0 is used. If any of the units are undefined, a value of 1.0 is used.

When there's no output extent defined in the geoprocessing analysis environment, the extent is calculated from the TIN, ensuring the entire data area is covered by the output raster. In this calculation, the lower left origin of the TIN, based on its rectangular extent, is used as the cell center of the lower left raster cell. Most raster description tools use the outer cell boundaries to describe extent, rather than cell centers, so it may appear the output raster's extent exceeds that of the input TINs. When there's an output extent defined, the TIN To Raster tool uses the origin of the specified extent as the lower left cell boundary for the output raster. This is for consistency of behavior with other raster tools and facilitates use of a snap raster. The X and Y max values of the output raster are then determined by using the origin plus the cellsize specified in the TIN To Raster tool to see how many rows and columns fit within the user-specified extent. Therefore, the actual X and Y max values of the output might not exactly match the user-defined values if width or height of extent is not evenly divisible by cellsize.

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Sours: https://desktop.arcgis.com/en/arcmap/10.3/tools/3d-analyst-toolbox/how-tin-to-raster-3d-analyst-works.htm
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Summary

Creates a raster by interpolating its cell values from the elevation of the input TIN at the specified sampling distance.

Learn more about how TIN To Raster works

Illustration

Create Raster From TIN illustration

Usage

  • Because interpolation of the input TIN surface occurs at regular intervals, some loss of information in the output raster should be expected. How well the raster represents the TIN is dependent on the resolution of the raster and the degree and interval of TIN surface variation. Generally, as the resolution is increased, the output raster more closely represents the TIN surface. Because the raster is a cell structure, it cannot maintain the hard and soft breakline edges that may be present in the TIN.

  • When exporting a large raster, consider specifying the Output Data Type as an integer to save on disk space if the accuracy requirements of your z-values are such that they can be represented by integer data.

Syntax

TinRaster_3d (in_tin, out_raster, {data_type}, {method}, {sample_distance}, {z_factor})

Code Sample

TinRaster example 1 (Python window)

The following sample demonstrates the use of this tool in the Python window.

TinRaster example 2 (stand-alone script)

The following sample demonstrates the use of this tool in a stand-alone Python script.

Environments

Licensing Information

  • ArcGIS for Desktop Basic: Requires 3D Analyst
  • ArcGIS for Desktop Standard: Requires 3D Analyst
  • ArcGIS for Desktop Advanced: Requires 3D Analyst

Related Topics

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Sours: https://desktop.arcgis.com/en/arcmap/10.3/tools/3d-analyst-toolbox/tin-to-raster.htm
Uso de la herramienta TIN to raster/Crear un DEM

to raster conversion

To convert a to a raster, all you need to do is choose a cell size—elevation values can then be interpolated from the at regularly-spaced intervals across the surface.

As you make the cell size smaller, more points are interpolated and the output raster resembles the input more closely.

A TIN’s slope and aspect values can also be converted to rasters.

Left: A 2D view of a layer. Right: A raster converted from the . Since a raster's extent must be rectangular, areas that are not interpolated are assigned the NoData value (symbolized in gray).

 Are TINs better than rasters?

No, just different. TINs and rasters both have their advantages. Some of the advantages of TINs are:

·        The model has variable resolution. A preserves the x,y location of input points, allowing for more detail where there is lots of surface variation and less detail where the surface doesn’t change much. A raster has the same amount of information for each part of the surface.

·        You can refine the surface topography with polygon and line features, representing roads, rivers, lakes, ridgelines, or other distinctive formations.

·        Because TINs are vector data, they display well at all zoom levels. Raster display degrades when you zoom in too close.

·        For large-scale applications (those covering a small area in detail) or applications where display quality is very important, TINs are often a better choice.

On the other hand, rasters have their advantages, too:

·        Their matrix structure makes them well-suited to analysis. Many more mathematical and statistical functions are available for rasters than for TINs.

·        They demand fewer system resources. They can be created and displayed more quickly and take up less disk space.

·        They are a more familiar and readily-available data type.

·        For small-scale applications (those covering a large area), or applications that require statistical analysis of data, rasters are often a better choice.

Sours: http://www.geography.hunter.cuny.edu/~jochen/gtech361/lectures/lecture10/3Dconcepts/TIN%20to%20raster%20conversion.htm

Raster tin to

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Creating a TIN from Raster data ArcGIS

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