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Thank you Matt for your explanation. I'm a little bit more confortable to know that the z tolerance works well. However, the trick with "snap raster" does not provide me residuals lower than 1... If anybody has an idea on the subject, please tell me. I am now quite sure that the problem is effectively a shift between my two rasters to compare, but i still don't know how to handle with it. Thank you for your attention.
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07-07-2013
11:32 PM
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I have read somewhere that two profiles can be stack correctly, but I don't remind that particular tool. So, I'll let you know about it. Click here for more details. Is that a joke ? You put the adress of a french website concerning properties : http://www.selogerneuf.com/immobilier/achat/ville/bien-maison !
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07-04-2013
05:26 AM
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Hi, i'm using ArcGIS 10.1, and i study the influence of the z tolerance of the "raster to TIN" tool. I proceed in this way : 1) i build a TIN from an initial 1-meter raster grid, using the "raster to TIN" tool with a z tolerance of 1 (the number of nodes of this TIN do not exceed the maximum number of point...) 2) i convert this TIN into a raster with the "TIN to raster" tool, using a "cellsize" of 1. 3) i calculate the residual between my initial raster and the new raster obtained from the TIN (itself obtained from the initial raster grid) using the "raster calculator" tool. When i visualize the results of this residual raster, i realize that some cells exceed 1 meter of residual value (basically around 1,20 meters, but some cells raise to 4 meters). How can it be possible, with the z tolerance of 1 meter ? I read this help of ArcGIS which describe the z tolerance method in the "raster to TIN" tool : "http://resources.arcgis.com/en/help/main/10.1/index.html#//00q90000008r000000" Thank you in advance for your help.
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07-03-2013
06:57 AM
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Indeed, I tested this method (taking a z-factor of ten and a z tolerance value of 2) and it works well. I just wanted to understand the limit in the z tolerance value. But effectively, it seems that my z accuracy is around 1 meter, which creates more nodes than my limitation of points (1500000). Thank you for your advice.
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06-20-2013
11:16 PM
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Hi ! I want to test different values of z tolerance with the "Raster to TIN" tool on an 1-meter-grid raster. I obtain acceptable TIN when the z tolerance is equal or higher than 1 unit. But when i test 0.5, 0.9 or even 0.999 values, my TIN becomes completely irrational (for example, the first half of my TIN is a perfect regular TIN with 1-meter edges, but the second half does not represent nothing, with 200-meters-edge triangles). It seems that 1 is a limit value for z tolerance, is this correct ? What can i do to test lower values than 1 ? Thank you for your attention. Mangeant Baptiste French Engineering Student
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06-19-2013
06:53 AM
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