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Hi Jayanta, Thanks for your reply, but I´d like to use the real measurement points, not the estimated content.
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06-16-2015
10:25 AM
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Hi everyone, it´s my aim to produce a diagram which shows contents along a river (cf. attached example). My initial situation: I have points of concentrations which are next to the river (cf. attached picture). So far I only have had initial approaches but these do not lead me to my aim, yet. Anyway, maybe some inspiration: Segmentation of river Creation of buffers around these segments Assign points to buffered segment (Problems: 1. maybe several points in one segment 2. A point might be in two overlaying buffers) Maybe there´s a possibility to pull the concentrations perpendicular to the river? Thanks in advance!
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05-30-2015
06:59 AM
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somewhat I don´t see the edit button anymore, strange... Anyway: I did it with TINs
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03-30-2013
06:45 AM
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Somehow I´m not able to make head of this. I´d like to extract/select the southern exposition-pixels of an aspect-raster, but these calculations don´t help me: whubers calculation gives out 7 classes of which 6 are actual aspect-classes which are in total 315° (his reference to his older replies in another thread doesn´t work for me). And Kristina´s calculations results in a raster, with a range of values between -1 and 359, which is somewhat crude not including 360. Maybe we can "reheat" the topic for ArcGIS 10.1 again? Regards and thanks in advance, Mathias
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03-25-2013
01:08 PM
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Okay -- try this: 1. Add "dtm20" to ArcMap as a raster layer 2. Start Raster Calculator. 3. Compose this expression. "dtm20" == FocalStatistics("dtm20",NbrCircle(5),"MAXIMUM") This should give you a 1-0 grid where 1 (True) cells are where the cell is at the local maximum for the 5x5 circular neighborhood. This will include flat areas. You can play with it further once you get that far. Example of how to specify neighborhood are in the help for Focal Statistics. Okay, it worked out, thank you very much for your help. Just two more things: I guess, in this case, exclusion of focalmins (like �??and (ingrid > focalmin(ingrid))�?�) is redundant, is it (just got a look with "swipe" with the effects-toolbar)? I don´t think �??zonal geometry�?� makes sense in case of chosen cells of a raster, too.
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03-15-2013
04:57 PM
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Sorry, I slipped back into 9x map algebra. Here's a raster calculator syntax ("inraster" == FocalStatistics("inraster","#","MAXIMUM")) and
("inraster" > FocalStatistics("inraster","#","MINIMUM")) Using a larger-than-default neighborhood may help you find broader "domes" that have some flat areas on the top. These areas could then be collapsed to single-cells or points using the Zonal Geometry tool with the CENTROID option. This will select areas where the center cell is the equal to or greater than the maximum of the neighborhood, as long as the whole neighborhood is not the same value (flat). Okay, I get some idea of what you´re heading for and the syntax. I tried it but it failed: dtm20=> my raster-data, # = neighboorhood settings? ("dtm20" == FocalStatistics("dtm20","5","MAXIMUM")) and
("dtm20" > FocalStatistics("dtm20","5","MINIMUM")) maybe a short explanation how to implement the code? Or maybe running "focal statistics" first, before some "raster calculator"? Thanks a lot for your help
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03-13-2013
01:24 PM
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Bill Huber would probably have a better idea -- but I can't resist suggesting that if you're looking for local maxima you could try selecting areas where (ingrid == focalmax(ingrid)) and (ingrid > focalmin(ingrid)) Using a larger-than-default neighborhood may help you find broader "domes" that have some flat areas on the top. These areas could then be collapsed to single-cells or points using the Zonal Geometry tool with the CENTROID option. mh... result still looks quite blurry, especially that code. Maybe someone has got a more concrete approach?
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03-11-2013
01:52 PM
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Hi everone, you guys know how to determine domes in a raster. I thought something of "curvature", but still cannot distinguish them from basins. Maybe something with a specific concave/convex kurtosis... Anyone´s got some experience with this? Thanks for your time!
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03-09-2013
05:16 PM
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Hi everyone, I´d like to install ArcGIS 10.1 but using my already installed python(x,y) instead of taking further MB space. Someone knows how to accomplish this? Thanks and regards, Mathias
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11-29-2012
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