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TIN to Raster

Kostas

Hi, I want to use 3 different series of Data in the form of TIN for a viewshed analysis. I thought to convert them to raster because as I saw, I cannot do a viewshed in the form of TIN. My problem is that when I convert TIN to Raster from the 3D Analysis toolbox, although the resolution in TIN is 10meters, in Raster is almost 30meters. Why is that? Can't i convert it to raster and to have the same resolution? The analysis at my raster is being made for 30 meters resolution or for 10 meters at last?

Thank you very much

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DanPatterson_Retired

Tin to raster How TIN To Raster works—Help | ArcGIS for Desktop

raster to TIN How Raster To TIN works—Help | ArcGIS for Desktop

In either case, either data structure is only as good as your input data, and that includes considerations of accuracy and in the case of precision you also need to look at spacing between the intervening point (if variable), the type of interpolator or aggregator in the case of rasters.

Kostas

Luke thanks for your interest. I don't have that issue, i just put the resolution i wanted at the cell size. My wonderies are just when I have a TIN from 10 meters resolution elevation data, and I create a raster from that TIN with resolution bigger than 10 meters, for example 1meter resolution (that I define every time), what are the restrictions of that step, you know the theory. This is mainly my problem, the theory beyond that. Thanks a lot.

LukeSturtevant

Kon,

If you are still having this issue, maybe you would consider uploading one of your tins so that we can better understand what is happening here.

Kostas

Yes, the default were the numbers I wrote above

JayantaPoddar

Hi Kon,

Did you try changing the environment setting of the tool?

Kostas

My main concern is, if it is totally arbitrary to define by myself the cellsize, because when I chose the cellsize its value shows 28.8839 and to an another TIN with bigger resolution it rises to 30.3111!!

Because with that logic I can also put the cellsize to be 1 meter also arbitrary, but it won't correspond to reality!!

NeilAyres

And you may want to check the environment settings for the extent, and can set the cell size there.

If creating several rasters from different tins (but over the same area), for the benefit of down stream processing, get them all to line up correctly (pixel co-registration), by defining, using the environment variables, the exact extent and pixel size, and use the first as a snap raster.

LukeSturtevant

Yes you should change it to CELLSIZE 10 if you want 10 meter cells. Unless your spatial reference has a linear unit of feet then that will produce a cell size of 10 feet.

Kostas

Well the problem is that I have the option Cellsize 28.8839. Can i change it to 10? Why it shew a cellsize at 28.8839 by default? Won't I affect something if I change it?

Kostas

oh no. I will do that now and i will post my results

LukeSturtevant

What spatial reference are you using? Did you set the sample distance to 'CELLSIZE 10' ?

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