Latest Contributions by MorganGraham

‎09-21-2018

Thanks Dan. Per the Resample link you shared above: "If the center of the pixel in output space falls exactly the same as one of the pixels in the input cells, that particular cell value gets all the weights, thereby causing the output pixel to be the same as the cell center. This will affect the result of bilinear interpolation and cubic convolution." The 10 meter land cover raster I originally described is actually a numerical relative habitat value score. If bilinear interpolation resampling in arcgis 10.3.1 is the same as ArcGIS Pro, then only the single center cell of nine input 10 meter cells is used in calculating the output 30 meter cell. Can anyone from ESRI confirm that as the case?

‎09-21-2018

There is a 10 meter resolution land cover raster. An analyst wishes to resample 10 meter raster to 30 meter raster. The analyst selects the Bilinear Resampling technique in the Resample tool of the Raster Processing toolset of ArcGIS 10.3. ArcGIS 10.3 help defines the Bilinear Resampling technique as: Performs a bilinear interpolation and determines the new value of a cell based on a weighted distance average of the four nearest input cell centers. It is useful for continuous data and will cause some smoothing of the data. A 30 meter output cell will contain nine cells from the input 10 meter raster. The closest input cell center will be the one that perfectly overlaps the output cell center. That leaves three remaining input cell center values for inclusion in the bilinear interpolation. In the resample of 10 m to 30 m there are eight remaining values that are equidistant to the output cell center. Which 3 values of the 8 equidistant values are utilized to create the output?

‎01-10-2013

Greetings, I have GPS collar data containing 1387 points. Each point is time/date stamped. The feature class is sorted by date. I would like a tool that simply starts at [Object_ID] = 1 and creates a line through [Object_ID] = 1387....essentially a sequential path. All the tools I've tried (ArcToolbox: Points to Line), (GME: convert.linestopoints), (ETGeowizards: Point to Polyline) error out. They want a field containing a shared value for multiple points, because you can't draw a line with one point. It seems like it should be fairly easy for a tool to work sequentially through a sequence of points and output a line with one less record than the total number of input points. Has anyone perfected a process for handling these type of data in the past. I am slightly embarrassed that I am having this much difficulty with a seemingly simple task. I'm sure I am missing something obvious. Any help would be greatly appreciated. Thanks, Morgan

‎10-01-2012

Greeting Hydro folks. I have telemetry locations for 30 different fish. Each fish has 15 - 20 locations ordered by date. I would like to somehow snap these points to the NHDFlowline and calculate total distance traveled by each fish. I've converted the NHD to a route feature class. It contains the main stem of the Snake River, as well as GNIS named tributaries. Any leads? Suggestions on what to refer to in the help would be greatly appreciated. The only help document working on something similar, basically said to spatially join the point feature class to the M-value of the NHDFlowline Routes, and then manually add and subtract distances in Excel for each fish. The only data I have in my NHDFlowline attribute table is the [Name] and [Shape_Length] in meters. There must be a better way, but I am floundering. Any advice would be greatly appreciated. Sincerely, Morgan Graham

‎12-13-2010

I'll have to give this a whirl... Still wondering though if people have an opinion on the following. If you client looks like they are going to be using 9.2 and 9.3 for some time, would you rather just create the geodatabase for them in 9.3, or are there enough benefits in 10 that justify jumping through the hoops of converting to the older version? Just curious.

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Latest Contributions by MorganGraham

Re: How does bilinear resampling work when converting a 10 meter raster to 30 meter?

How does bilinear resampling work when converting a 10 meter raster to 30 meter?

How to convert GPS collar data to sequential path

How to calculate distance traveled by a fish along a stream network....

Re: Convert v10 file geodatabase to a v9.3.1 file geodatabase?